KR20200141655A - An unit-cell structure and A sandwich plate comprising the same - Google Patents

Abstract

The present invention relates to a unit cell and a sandwich panel material having the same. The unit cell comprises: a hexagonal cylindrical base frame; and an inner frame positioned in an inner area of the base frame and having a cross-section of an H-shaped frame structure. Accordingly, the sandwich panel material can prevent degradation of strength and stiffness.

Description

A sandwich plate including a unit cell and a unit cell {An unit-cell structure and A sandwich plate comprising the same}

The present invention relates to a sandwich plate including a unit cell and a unit cell, and more particularly, to a unit cell capable of providing a sandwich panel capable of maintaining rigidity while achieving weight reduction.

The conventional sandwich plate is constructed to have an internal structure of a three-dimensional shape using a synthetic resin composite material, foam, or metal or non-metal. Such sandwich panels are manufactured by bonding surface plates to both upper and lower surfaces of the internal structure of the unit layer.

Among them, especially in the case of ships or large structures, I-beams or corrugate structures, which are easily produced in industry, have been used as internal structures. However, such a structure has a problem that may be overdesigned by the anisotropic characteristic of the structure itself.

Recently, various types of internal truss structures have been studied as sandwich inner cores. Typical examples are pyramid, octet, and kagome structures. In the case of an octet truss structure, each element is connected in an equilateral triangle, so that mechanical properties are constant in all directions.

On the other hand, Korean Patent Laid-Open No. 10-2012-0050573 discloses a sandwich plate using a pyramidal truss structure and a method of manufacturing the same. 1 and 2, this will be described as follows.

1 is a schematic perspective view showing a conventional pyramid-shaped truss structure, and FIG. 2 is a schematic view showing a sandwich plate including the pyramid-shaped truss structure of FIG. 1.

First, referring to FIG. 1, a conventional pyramid-shaped truss structure 10 may be formed by joining two structural unit cells, and the structural unit cell includes a quadrangular pyramidal leg extending radially, and the upper part The face is bent in a plane.

Next, referring to FIG. 2, a sandwich plate including a pyramidal truss structure may be formed by combining the plurality of pyramidal truss structures 10 of FIG. 1 described above between the plate members 20.

More specifically, a plurality of pyramidal truss structures 10 are coupled between the upper and lower plates, and at this time, the plurality of pyramidal truss structures 10 are welded, brazed, transition liquid (TLP), adhesive bonding, etc. By the method of, it can be bonded to the plate.

However, in the case of a conventional sandwich plate, when welding or brazing is used in joining the plurality of pyramid-shaped truss structures and the plate, the properties of the truss structure change due to the high temperature generated during the joining process. There is a problem of lowering the strength according to the problem, and also, there is a problem in that the rigidity of the structure is weakened due to a problem due to bonding.

The problem to be solved by the present invention is to provide a unit cell capable of providing a sandwich panel capable of maintaining rigidity while achieving weight reduction.

Objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above-noted problem, the present invention includes a base frame having a hexagonal column shape; And an inner frame positioned in an inner region of the base frame, wherein the inner frame has a frame structure having an "H" shape in cross section.

In addition, the present invention is the base frame, the upper surface; A first side surface including a lower surface facing the upper surface and continuously located between a first side of the upper surface and a first side of the lower surface; A second side surface continuously positioned between the second side of the upper surface and the second side of the lower surface; A third side surface continuously positioned between the third side of the upper surface and the third side of the lower surface; A fourth side surface positioned facing the first side surface and continuously positioned between a fourth side of the upper surface and a fourth side of the lower surface; A fifth side surface positioned facing the second side surface and continuously positioned between a fifth side of the upper surface and a fifth side of the lower surface; And a sixth side surface positioned facing the third side and continuously positioned between the sixth side of the upper surface and the sixth side of the lower surface.

In addition, in the present invention, the base frame includes six upper vertices and six lower vertices, and the six upper vertices may include an upper first vertex in a counterclockwise direction; An upper second vertex positioned apart from the upper first vertex and positioned adjacent to the upper first vertex; An upper third vertex positioned apart from the upper second vertex and adjacent to the upper second vertex; An upper fourth vertex positioned apart from the upper third vertex and adjacent to the upper third vertex; An upper fifth vertex positioned apart from the upper fourth vertex and adjacent to the upper fourth vertex; And a sixth vertex positioned apart from the upper fifth vertex and positioned adjacent to the upper fifth vertex. Further, the six lower vertices may include a lower first vertex in a counterclockwise direction; A lower second vertex positioned to be spaced apart from the lower first vertex and adjacent to the lower first vertex; A lower third vertex positioned apart from the lower second vertex and adjacent to the lower second vertex; A lower fourth vertex positioned apart from the lower third vertex and positioned adjacent to the lower third vertex; A lower fifth vertex positioned to be spaced apart from the lower fourth vertex and adjacent to the lower fourth vertex; And a sixth vertex positioned to be spaced apart from the lower fifth vertex and adjacent to the lower fifth vertex.

In addition, in the present invention, the base frame includes 6 upper line segments, 6 lower line segments, and 6 side line segments, and the 6 upper line segments are counterclockwise based on the upper first vertex and the upper An upper first line segment connecting the second vertices; An upper second line segment connecting the upper second vertex and the upper third vertex; An upper third line segment connecting the upper third vertex and the upper fourth vertex; An upper fourth line segment connecting the upper fourth vertex and the upper fifth vertex; An upper fifth line segment connecting the upper fifth vertex and the upper sixth vertex; And an upper sixth line segment connecting the upper sixth vertex and the upper first vertex, and the six lower line segments are, based on a counterclockwise direction, the lower first vertex and the lower second vertex A lower first line segment connecting the lines; A lower second line segment connecting the lower second vertex and the lower third vertex; A lower third line segment connecting the lower third vertex and the lower fourth vertex; A lower fourth line segment connecting the lower fourth vertex and the lower fifth vertex; A lower fifth line segment connecting the lower fifth vertex and the lower sixth vertex; And a lower sixth line segment connecting the lower sixth vertex and the lower first vertex, and the six side line segments include the upper first vertex and the lower first vertex based on a counterclockwise direction. A side first line segment to connect; A side second line segment connecting the upper second vertex and the lower second vertex; A third line segment connecting the upper third vertex and the lower third vertex; A fourth line segment connecting the upper fourth vertex and the lower fourth vertex; A fifth line segment connecting the upper fifth vertex and the lower fifth vertex; And a sixth line segment connecting the upper sixth vertex and the lower sixth vertex.

In addition, in the present invention, the inner frame includes a first flange portion positioned on a first side; A second flange portion spaced apart from the first flange portion by a predetermined interval; And a web portion connecting the first flange portion and the second flange portion.

In addition, the present invention is the first flange portion, the upper y-direction first line segment; A lower y-direction first line segment facing the upper y-direction first line segment); One side z-direction first line segment connected to one side of the upper y-direction first line segment and the other side connected to one side of the lower y-direction first line segment; And a first line segment in the z-direction on the other side, located facing the first line segment in the z-direction, and one side is connected to the other side of the first line segment in the upper y direction, and the other side is connected to the other side of the first line segment in the lower y-direction And, the second flange portion, the upper y-direction second line segment; A lower y-direction second line segment facing the upper y-direction second line segment; One side z-direction second line segment connected to one side of the upper y-direction second line segment and the other side connected to one side of the lower y-direction second line segment; And a second line segment in the z direction located facing the second line segment in the z direction, and one side is connected to the other side of the second line segment in the upper y direction, and the other side is connected to the other side of the second line segment in the lower y direction. And, the web portion, the upper x-direction first line segment; A lower x-direction first line segment facing the upper x-direction first line segment; One side z-direction third line segment connected to one side of the upper x-direction first line segment and the other side connected to one side of the lower x-direction first line segment; And a third line segment in the z direction located facing the third line segment in the z direction, and one side is connected to the other side of the first line segment in the upper x direction, and the other side is connected to the other side of the first line segment in the lower x direction. Unit cell

In the present invention, the one side z-direction third line segment of the web part is connected by contacting the first flange part, and the other side z-direction third line segment of the web part is connected by contacting the second flange part. The web portion provides a unit cell, characterized in that it is connected to the first flange portion and the second flange portion.

In addition, the present invention provides a first unit cell including a first base frame having a hexagonal column shape and a first inner frame positioned in an inner region of the first base frame; A second unit cell including a second base frame having a hexagonal column shape, and a second inner frame positioned in an inner region of the second base frame; And a third unit cell including a third base frame having a hexagonal column shape and a third inner frame positioned in an inner region of the third base frame.

In addition, the present invention provides a plurality of unit cell structures, wherein the first inner frame, the second inner frame, and the third inner frame have a frame structure having an "H" shape in cross section.

In addition, in the present invention, the structure of the plurality of unit cells is a structure in which a plurality of three unit cells are continuous, and a structure in which a plurality of three unit cells are continuous is based on a plan view, and the first unit cell is the second unit cell. The unit cell and the third unit cell are in contact, the second unit cell is in contact with the first unit cell and the third unit cell, and the third unit cell is the first unit cell and the second unit cell It provides a plurality of unit cell structure, characterized in that the structure in contact with.

In addition, in the present invention, the first base frame includes a first upper surface, a first lower surface, a 1-1 side, a 1-2 side, a 1-3 side, a 1-4 side, and a 1-5 side. And eight surfaces of side 1-6, wherein the second base frame includes a second upper surface, a second lower surface, a 2-1 side, a 2-2 side, a 2-3 side, and a second -4 sides, 2-5 sides and 2-6 sides including 8 sides, and the third base frame includes a third upper side, a third lower side, a 3-1 side, and a 3-2 side , 3-3 side, 3-4 side, 3-5 side and 3-6 side, including 8 sides, the plurality of unit cell structure is a structure in which a plurality of three unit cells are continuous, In a structure in which a plurality of the three unit cells are continuous, the 1-3 side surfaces of the first base frame are in contact with the 2-6 side surfaces of the second base frame, and the 1-2 pieces of the first base frame The side surface is in contact with the 3-5 side of the third base frame, and the 2-1 side of the second base frame is a plurality of features in a structure in contact with the 3-4 side of the third base frame. Provide a unit cell structure.

In addition, in the present invention, the first base frame includes a side 1-1 line segment, a side 1-2 line segment, a side 1 3 line segment, a side 1-4 line segment, a side 1-5 line segment, and a side 1 -Six side segment including 6 segment, and the second base frame includes: side 2-1 segment, side 2-2 segment, side 2-3 segment, side 2-4 segment, side It includes 6 side line segments including a 2-5 line segment and a side 2-6 line segment, and the third base frame includes: a side 3-1 line segment, a side 3-2 line segment, and a side 3-3 line segment It provides a plurality of unit cell structures including six side line segments including a side 3-4 line segment, a side 3-5 line segment, and a side 3-6 line segment.

In addition, in the present invention, the first inner frame, the second inner frame, and the third inner frame, respectively, the first flange portion located on the first side; A second flange portion spaced apart from the first flange portion by a predetermined interval; And a web portion connecting the first flange portion and the second flange portion, wherein the first flange portion comprises: a first line segment in an upper y direction; A lower y-direction first line segment facing the upper y-direction first line segment); One side z-direction first line segment connected to one side of the upper y-direction first line segment and the other side connected to one side of the lower y-direction first line segment; And a first line segment in the z-direction on the other side, located facing the first line segment in the z-direction, and one side is connected to the other side of the first line segment in the upper y direction, and the other side is connected to the other side of the first line segment in the lower y-direction And, the second flange portion, the upper y-direction second line segment; A lower y-direction second line segment facing the upper y-direction second line segment; One side z-direction second line segment connected to one side of the upper y-direction second line segment and the other side connected to one side of the lower y-direction second line segment; And a second line segment in the z direction located facing the second line segment in the z direction, and one side is connected to the other side of the second line segment in the upper y direction, and the other side is connected to the other side of the second line segment in the lower y direction. And, the web portion, the upper x-direction first line segment; A lower x-direction first line segment facing the upper x-direction first line segment; One side z-direction third line segment connected to one side of the upper x-direction first line segment and the other side connected to one side of the lower x-direction first line segment; And a third line segment in the z direction located facing the third line segment in the z direction, and one side is connected to the other side of the first line segment in the upper x direction, and the other side is connected to the other side of the first line segment in the lower x direction. It provides a plurality of unit cell structures.

In addition, in the present invention, the first base frame and the first inner frame of the first unit cell are arranged in at least one of a 0° rotation state, a 30° rotation state, and a 60° rotation state, and the first The second base frame and the second inner frame of the second unit cell are disposed in at least one of a 0° rotation state, a 30° rotation state, and a 60° rotation state, and the third unit cell The base frame and the third inner frame provide a plurality of unit cell structures, characterized in that they are disposed in at least one of a 0° rotation state, a 30° rotation state, and a 60° rotation state.

In addition, in the present invention, the 0° rotation state refers to a reference point in a certain state in which the inner frame located in the inner region of the base frame is located, and the 30° rotation state is based on a 0° rotation state as a reference point. , It means a state in which the inner frame is rotated 30° in the inner area of the base frame, and the 60° rotation state is a state in which the inner frame is rotated 60° in the inner area of the base frame based on the 0° rotation state as a reference point. It provides a multi-unit cell structure that means.

According to the present invention as described above, the base frame of the hexagonal column shape; And through the unit cell of the structure including the inner frame located in the inner region of the base frame, it is possible to manufacture a unit cell capable of preventing a decrease in strength and preventing a weakening of rigidity, and a sandwich plate material including the same. .

In addition, in the present invention, through a sandwich plate material including a plurality of unit cell structures, it is possible to further prevent a decrease in strength and a sandwich plate material capable of preventing weakening of rigidity.

1 is a schematic perspective view showing a conventional pyramid-shaped truss structure, and FIG. 2 is a schematic view showing a sandwich plate including the pyramid-shaped truss structure of FIG. 1.
3 is a real photograph showing a unit cell according to the present invention.
Figure 4 is a schematic perspective view showing a base frame according to the present invention, Figure 5 is a schematic plan view showing the base frame according to the present invention.
6 is a schematic perspective view showing an inner frame according to the present invention, and FIG. 7 is a schematic plan view showing an inner frame according to the present invention.
FIG. 8 is a schematic plan view showing a connection relationship between a base frame and an inner frame according to a first example, and FIG. 9 is a schematic plan view showing a connection relationship between a base frame and an inner frame according to the present invention. 10 is a schematic plan view showing a connection relationship between a base frame and an inner frame according to a third example of the present invention.
11 is a schematic plan view showing a structure in which a plurality of unit cells are continuous according to the present invention.
12 is a schematic diagram showing an example of a sandwich panel including a unit cell according to the present invention.
13 is a photograph showing the stress distribution of the sandwich plate according to the comparative example, and FIG. 14 is a graph showing the stress distribution of the sandwich plate according to the comparative example.
15 is a photograph showing the stress distribution of the sandwich plate including the unit cell according to the present invention, Figure 16 is a graph showing the stress distribution of the sandwich plate including the unit cell according to the present invention.
17 is a graph showing a stress distribution of a sandwich plate including a plurality of unit cell structures according to the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims.

With reference to the accompanying drawings below will be described in detail for the implementation of the present invention. Regardless of the drawings, the same reference numerals refer to the same elements, and "and/or" includes each and all combinations of one or more of the mentioned items.

Although the first, second, and the like are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical idea of the present invention.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, “comprises” and/or “comprising” do not exclude the presence or addition of one or more other elements other than the mentioned elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc., as shown in the figure It can be used to easily describe the correlation between a component and other components. Spatially relative terms should be understood as terms including different directions of components during use or operation in addition to the directions shown in the drawings. For example, if a component shown in a drawing is turned over, a component described as "below" or "beneath" of another component will be placed "above" the other component. I can. Accordingly, the exemplary term “below” may include both directions below and above. Components may be oriented in other directions, and thus spatially relative terms may be interpreted according to the orientation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a real photograph showing a unit cell according to the present invention.

Referring to Figure 3, the unit cell 10 according to the present invention, the base frame 100 of the hexagonal column shape; And an inner frame 200 positioned in an inner region of the base frame 100.

In this case, the term "hexagonal pillar" in the present invention means a prismatic pillar having a hexagonal upper surface and a lower surface thereof, and in the drawing, the angle formed by the side surface and the upper surface and the side surface and the lower surface of the hexagonal column is a right-angled column. Although shown, the angle formed by the side surface and the upper surface and the side surface and the lower surface of the hexagonal column may be an oblique column instead of a right angle, and the definition of the hexagonal column is not limited in the present invention.

Meanwhile, as shown in FIG. 3, the inner region of the base frame 100 is in a hollow state, and thus, the inner frame may be located in the hollow inner region.

In addition, the inner frame 200 corresponds to a frame structure having an "H" shape in cross section, and the inner frame having an "H" shape includes two first and second flange portions on the left and right sides. It is composed of a flange portion and a web portion connecting the first flange portion and the second flange portion, and the shape of the inner frame 200 will be described later.

Figure 4 is a schematic perspective view showing a base frame according to the present invention, Figure 5 is a schematic plan view showing the base frame according to the present invention. Meanwhile, in FIG. 4, for convenience of explanation, the same drawings are divided into (a) to (c), and in (a), reference numerals for eight sides of the base frame are shown, and in (b), the base Reference numerals for 12 vertices of the frame are shown, and in Fig. (c), reference numerals for 18 line segments of the base frame are shown.

3 to 5, the base frame 10 according to the present invention, the upper surface 110; A first including a lower surface 120 positioned to face the upper surface 110, and continuously positioned between the first side of the upper surface 110 and the first side of the lower surface 120 Side 130; A second side surface 140 continuously positioned between the second side of the upper surface 110 and the second side of the lower surface 120; A third side surface 150 continuously positioned between the third side of the upper surface 110 and the third side of the lower surface 120; A fourth side surface 160 located facing the first side surface 130 and continuously located between a fourth side of the upper surface 110 and a fourth side of the lower surface 120; A fifth side surface 170 located facing the second side surface 140 and continuously located between a fifth side of the upper surface 110 and a fifth side of the lower surface 120; And a sixth side surface 180 positioned facing the third side surface 150 and continuously positioned between a sixth side of the upper surface 110 and a sixth side of the lower surface 120. .

That is, the base frame 100 according to the present invention includes an upper surface 110, a lower surface 120, a first side 130, a second side 140, a third side 150, and a fourth side ( 160), the fifth side 170 and the sixth side 180, and the definition of the shape of the hexagonal column corresponds to the general one, and in the present invention, the meaning of the upper, lower, side, etc. It does not limit the scope of rights.

In this case, as shown in FIG. 3, the upper surface 110 and the lower surface 120 of the base frame 100 according to the present invention may be in an open state without a separate structure.

In addition, the first side 130, the second side 140, the third side 150, the fourth side 160, the fifth side 170 and the sixth side 180 are all formed of a flat plate. However, unlike this, as shown in FIG. 3, it may be configured in a mesh type.

For example, in the base frame 100 according to the present invention, the first side surface 130 is a first flat plate, the second side surface 140 is a second flat plate, and the third side surface 150 is The third flat plate, the fourth side 160 may be defined as a fourth flat plate, the fifth side 170 may be defined as a fifth flat plate, and the sixth side 180 may be defined as a sixth flat plate. (110) and the lower surface 120 may correspond to an open state.

In addition, in the base frame 100 according to the present invention, the first side surface 130 is a first mesh plate, the second side surface 140 is a second mesh plate, and the third side surface 150 is a third mesh plate. The plate, the fourth side 160 may be defined as a fourth mesh plate, the fifth side 170 may be defined as a fifth mesh plate, and the sixth side 180 may be defined as a sixth mesh plate. In this case, the upper surface 110 ) And the lower surface 120 may correspond to an open state.

Subsequently, referring to FIGS. 3 to 5, the base frame 100 according to the present invention includes 12 vertices, that is, 6 upper vertices and 6 lower vertices, according to the general definition of a hexagonal column shape. Includes.

More specifically, the six upper vertices may include an upper first vertex 111 based on a counterclockwise direction; An upper second vertex 112 positioned to be spaced apart from the upper first vertex 111 and adjacent to the upper first vertex 111; An upper third vertex 113 positioned to be spaced apart from the upper second vertex 112 and adjacent to the upper second vertex 112; An upper fourth vertex 114 located apart from the upper third vertex 113 and adjacent to the upper third vertex 113; An upper fifth vertex 115 positioned to be spaced apart from the upper fourth vertex 114 and adjacent to the upper fourth vertex 114; And a sixth vertex 116 positioned to be spaced apart from the upper fifth vertex 115 and positioned adjacent to the upper fifth vertex 115.

In addition, the six lower vertices may include a lower first vertex 121 based on a counterclockwise direction; A lower second vertex 122 positioned to be spaced apart from the lower first vertex 121 and adjacent to the lower first vertex 121; A lower third vertex 123 positioned to be spaced apart from the lower second vertex 122 and adjacent to the lower second vertex 122; A lower fourth vertex 124 located apart from the lower third vertex 123 and adjacent to the lower third vertex 123; A lower fifth vertex 125 positioned to be spaced apart from the lower fourth vertex 124 and adjacent to the lower fourth vertex 124; And a sixth vertex 126 positioned to be spaced apart from the lower fifth vertex 125 and adjacent to the lower fifth vertex 125.

That is, the base frame 100 according to the present invention includes the upper first vertex 111, the upper second vertex 112, the upper third vertex 113, the upper fourth vertex 114, and the upper fifth vertex. (115) and six upper vertices of the upper sixth vertex 116, the lower first vertex 121, the lower second vertex 122, the lower third vertex 123, and the lower fourth vertex 124 , The lower fifth vertex 125 and the lower sixth vertex 126 include six lower vertices, and the definition of the vertex of such a hexagonal column corresponds to the general one, and the meaning of the upper, lower, etc. is right in the present invention. It does not impose a limit on the scope.

Subsequently, referring to FIGS. 3 to 5, the base frame 100 according to the present invention includes 18 line segments (corners) according to the general definition of a hexagonal column shape, that is, 6 upper line segments, 6 It includes 4 lower segments and 6 side segments.

More specifically, the six upper line segments may include an upper first line segment 131 connecting the upper first vertex 111 and the upper second vertex 112 based on a counterclockwise direction; An upper second line segment 141 connecting the upper second vertex 112 and the upper third vertex 113; An upper third line segment (151) connecting the upper third vertex (113) and the upper fourth vertex (114); An upper fourth line segment (161) connecting the upper fourth vertex (114) and the upper fifth vertex (115); An upper fifth line segment 171 connecting the upper fifth vertex 115 and the upper sixth vertex 116; And an upper sixth line segment 181 connecting the upper sixth vertex 116 and the upper first vertex 111.

In addition, the six lower line segments may include: a lower first line segment 132 connecting the lower first vertex 121 and the lower second vertex 122 based on a counterclockwise direction; A lower second line segment 142 connecting the lower second vertex 122 and the lower third vertex 123; A lower third line segment 152 connecting the lower third vertex 123 and the lower fourth vertex 124; A lower fourth line segment 162 connecting the lower fourth vertex 124 and the lower fifth vertex 125; A lower fifth line segment 172 connecting the lower fifth vertex 125 and the lower sixth vertex 126; And a lower sixth line segment 182 connecting the lower sixth vertex 126 and the lower first vertex 121.

In addition, the six side segment may include a first side segment 191 connecting the upper first vertex 111 and the lower first vertex 121 in a counterclockwise direction; A side second line segment 192 connecting the upper second vertex 112 and the lower second vertex 122; A third side segment (193) connecting the upper third vertex (113) and the lower third vertex (123); A fourth line segment (194) connecting the upper fourth vertex (114) and the lower fourth vertex (124); A fifth line segment (195) connecting the upper fifth vertex (115) and the lower fifth vertex (125); And a sixth side segment 196 connecting the upper sixth vertex 116 and the lower sixth vertex 126.

That is, the base frame 100 according to the present invention includes an upper first line segment 131, an upper second line segment 141, an upper third segment 151, an upper fourth segment 161, and an upper fifth segment ( 171) and six upper line segments including the upper sixth line segment 181, and the lower first line segment 132, the lower second segment 142, the lower third segment 152, and the lower fourth segment ( 162), the lower fifth line segment 172 and the lower sixth line segment 182, including six lower line segments, the side first line segment 191, the side second segment 192, the side third segment ( 193), the fourth side segment 194, the fifth side segment 195, and the sixth side segment 196, and the definition of the line segment of such a hexagonal column corresponds to the general one. , In the present invention, the scope of the right is not limited to the meaning of the upper, lower, side, etc.

6 is a schematic perspective view showing an inner frame according to the present invention, and FIG. 7 is a schematic plan view showing an inner frame according to the present invention.

3, 6, and 7, as described above, the inner frame 200 according to the present invention corresponds to a frame structure having an "H" shape in cross section. Hereinafter, the inner frame according to the present invention The structure of 200 will be defined as a frame structure having an "H" shape in cross section.

More specifically, the inner frame 200 includes a first flange portion 210 positioned on a first side; A second flange portion 220 positioned to be spaced apart from the first flange portion 210 by a predetermined interval; And a web part 230 connecting the first flange part 210 and the second flange part 220 to each other.

At this time, the names of the flange portion and the web portion are based on the definition in the H-beam, and the first flange portion is a frame in the first direction on the first side, the second flange portion is a frame in the first direction on the second side, and the web portion It may be defined as a second direction frame, and the first flange portion may be defined as a first vertical frame, the second flange portion may be defined as a second vertical frame, and the web portion may be defined as a horizontal frame. The first flange portion may be defined as a first horizontal frame, the second flange portion may be defined as a second horizontal frame, and the web portion may be defined as a vertical frame.

Subsequently, referring to FIGS. 3, 6 and 7, the first flange part 210 includes a first line segment 211 in the upper y direction; A lower y-direction first line segment 212 positioned to face the upper y-direction first line segment 211; One z-direction first line segment 213 connected to one side of the upper y-direction first line segment 211 and the other side connected to one side of the lower y-direction first line segment 212; And the one side z-direction first line segment 213 facing each other, one side connected to the other side of the upper y-direction first line segment 211, and the other side connected to the other side of the lower y-direction first line segment 212 The other side z-direction first line segment 214 is included.

That is, the upper y-direction first line segment 211; One z-direction first line segment 213; A lower y-direction first line segment 212; And the other z-direction first line segment 214 is continuously arranged to constitute the first flange part 210 according to the present invention.

In addition, the second flange portion 220 includes a second line segment 221 in the upper y direction; A lower y-direction second line segment 222 positioned to face the upper y-direction second line segment 221; One side z-direction second line segment 223 connected to one side of the upper y-direction second line segment 221 and the other side connected to one side of the lower y-direction second line segment 222; And the one side z-direction second line segment 223 facing each other, one side is connected to the other side of the upper y-direction second line segment 221, and the other side is connected to the other side of the lower y-direction second line segment 222 It includes a second line segment 224 on the other side of the z-direction.

That is, the upper y-direction second line segment 221; One side z-direction second line segment 223; A second line segment 222 in the lower y direction; And the other z-direction first line segment 224 is continuously arranged to constitute the second flange unit 220 according to the present invention.

Subsequently, referring to FIGS. 3, 6 and 7, the web part 230 connecting the first flange part 210 and the second flange part 220 is provided with a first line segment 231 in the upper x direction. ); A lower x-direction first line segment 232 positioned to face the upper x-direction first line segment 231; One side z-direction third line segment 233 connected to one side of the upper x-direction first line segment 231 and the other side connected to one side of the lower x-direction first line segment 232; And the one side z-direction third line segment 233 facing each other, one side is connected to the other side of the upper x-direction first line segment 231, and the other side is connected to the other side of the lower x-direction first line segment 232 It includes a third line segment 234 in the z-direction on the other side.

The upper x-direction first line segment 231; The lower x-direction first line segment 232; A third line segment 233 in the z direction; And the other side z-direction third line segment 234 is continuously arranged to constitute the web part 230 according to the present invention.

At this time, as shown in the drawing, the one side z-direction third line segment 233 of the web part 230 is connected in contact with the first flange part 210, and the other side of the web part 230 The z-direction third line segment 234 is connected in contact with the second flange part 220, so that the web part 230 may be connected to the first flange part 210 and the second flange part 220. have.

Hereinafter, a connection relationship between the base frame 100 and the inner frame 200 according to the present invention will be described.

FIG. 8 is a schematic plan view showing a connection relationship between a base frame and an inner frame according to a first example, and FIG. 9 is a schematic plan view showing a connection relationship between a base frame and an inner frame according to the present invention. 10 is a schematic plan view showing a connection relationship between a base frame and an inner frame according to a third example of the present invention.

4 and 5, as described above, the six side segments of the base frame 100 are, based on a counterclockwise direction, the upper first vertex 111 and the lower first vertex ( A side first line segment 191 connecting the 121); A side second line segment 192 connecting the upper second vertex 112 and the lower second vertex 122; A third side segment (193) connecting the upper third vertex (113) and the lower third vertex (123); A fourth line segment (194) connecting the upper fourth vertex (114) and the lower fourth vertex (124); A fifth line segment (195) connecting the upper fifth vertex (115) and the lower fifth vertex (125); And a sixth side segment 196 connecting the upper sixth vertex 116 and the lower sixth vertex 126.

Further, referring to FIGS. 6 and 7, as described above, the inner frame 200 includes: the upper y-direction first line segment 211; One z-direction first line segment 213; A lower y-direction first line segment 212; And the other z-direction first line segment 214 is continuously arranged to constitute the first flange part 210 according to the present invention, and the upper y-direction second line segment 221; One side z-direction second line segment 223; A second line segment 222 in the lower y direction; And the other z-direction first line segment 224 is continuously arranged to constitute the second flange unit 220 according to the present invention.

At this time, first, referring to FIGS. 3 to 8, the connection relationship between the base frame and the inner frame according to the first example of the present invention is, the first line segment 213 in the z direction of the inner frame 200 is the base The first line segment 214 in the z direction of the other side of the inner frame 200 is connected in contact with the first line segment 191 of the frame 100. 195).

In addition, the one side z-direction second line segment 223 of the inner frame 200 is connected in contact with the side second line segment 192 of the base frame 100 and is connected to the other side of the inner frame 200. The z-direction first line segment 224 is connected by contacting the side fourth line segment 194 of the base frame 100.

Thus, according to the connection relationship of the first example, the base frame 100 of the hexagonal column shape; And a unit cell including an inner frame 200 positioned in an inner region of the base frame 100.

Next, referring to FIGS. 3 to 7 and 9, the connection relationship between the base frame and the inner frame according to the second example of the present invention is as follows. The first line segment 213 of the one side z direction of the inner frame 200 is The first line segment 214 in the z direction of the other side of the inner frame 200 is connected in contact with the sixth line segment 196 of the side of the base frame 100. The line segment 194 is contacted and connected.

In addition, the one side z-direction second line segment 223 of the inner frame 200 is connected in contact with the side first line segment 191 of the base frame 100, and the other side of the inner frame 200 The z-direction first line segment 224 is connected by contacting the third side line segment 193 of the base frame 100.

Thus, according to the connection relationship of the second example, the base frame 100 of the hexagonal column shape; And a unit cell including an inner frame 200 positioned in an inner region of the base frame 100.

Next, referring to FIGS. 3 to 7 and 10, the connection relationship between the base frame and the inner frame according to the present invention is a third example, the first line segment 213 of the one side z direction of the inner frame 200 is The first line segment 214 in the z direction of the other side of the inner frame 200 is connected in contact with the fifth side segment 195 of the base frame 100. The line segment 193 is contacted and connected.

In addition, the one side z-direction second line segment 223 of the inner frame 200 is connected in contact with the sixth line segment 196 of the side portion of the base frame 100, and the other side of the inner frame 200 The z-direction first line segment 224 is connected by contacting the side second line segment 192 of the base frame 100.

Thus, according to the connection relationship of the third example, the base frame 100 of the hexagonal column shape; And a unit cell including an inner frame 200 positioned in an inner region of the base frame 100.

Hereinafter, for convenience of explanation, the connection relationship between the base frame and the inner frame is rotated by 0°, the connection relationship between the base frame and the inner frame is rotated by 30°, and the base frame and the inner frame are rotated by 30°. The connection relationship in the example will be defined as a state of 60° rotation.

That is, the 0° rotation state indicates a reference point, and as shown in FIG. 8, the inner frame is located in the inner region of the base frame, and the 30° rotation state is described above. In the inner region of the base frame as shown in FIG. 9, the internal frame is rotated by 30° based on the 0° rotational state as a reference point, and the 60° rotational state is as in FIG. It means a state in which the inner frame rotates by 30° in the inner region of the base frame based on a 60° rotation state as a reference point.

11 is a schematic plan view showing a structure in which a plurality of unit cells are continuous according to the present invention.

Referring to FIG. 11, a structure in which a plurality of unit cells according to the present invention are continuous means a structure in which a plurality of unit cells in a 0° rotation state, a 30° rotation state, and a 60° rotation state as described above are continuous. . Hereinafter, a structure in which a plurality of unit cells are continuous will be defined as a plurality of unit cell structures.

More specifically, as shown in FIG. 11, a structure in which a plurality of unit cells according to the present invention is continuous, that is, a plurality of unit cell structures, may be arranged in the form of Model 1 to Model 9, but the present invention In this arrangement, the arrangement corresponds to an exemplary one, and the present invention does not limit the type of the structure in which a plurality of unit cells are consecutive.

However, a structure in which a plurality of unit cells according to the present invention is continuous may be a honeycomb structure having a structure in which at least three unit cells contact each other, and hereinafter, in the present invention, a structure in which three unit cells each contact each other Is defined as a honeycomb structure.

In this case, the structure in which the three unit cells are in contact with each other means that, for example, when the three unit cells are referred to as a first unit cell, a second unit cell, and a third unit cell, a plan view as in FIG. 11 is shown. As a reference, the first unit cell contacts the second unit cell and the third unit cell, the second unit cell contacts the first unit cell and the third unit cell, and the third unit cell Denotes a structure in contact with the first unit cell and the second unit cell.

This is defined through the plane of the base frame in FIG. 4 described above.

That is, as described above, each unit cell includes a base frame, and as shown in FIG. 4, the base frame 100 includes an upper surface 110, a lower surface 120, and a first side surface 130. , The second side 140, the third side 150, the fourth side 160, the fifth side 170, and consists of eight sides of the sixth side (180).

In this case, the first unit cell, the second unit cell, and the third unit cell include a first base frame, a second base frame, and a third base frame, and the first base frame, the second base frame, and the third unit cell The 3 base frame includes, respectively, a first side, a second side, a third side, a fourth side, a fifth side, and a sixth side, and the structure in which the three unit cells contact each other means that the 1 The third side of the base frame is in contact with the sixth side of the second base frame, the second side of the first base frame is in contact with the fifth side of the third base frame, and The first side may mean a structure in contact with the fourth side of the third base frame.

However, the definition of the structure in which the three unit cells contact each other through the surface of the unit cell is an example, and in the present invention, the structure in which the three unit cells contact each other through the surface of the unit cell It does not limit how it is defined.

Meanwhile, as described above, the structure in which a plurality of unit cells according to the present invention is continuous means a structure in which a plurality of unit cells in a 0° rotation state, a 30° rotation state, and a 60° rotation state are continuous, and Model It can be arranged in the form of 1 to Model 9.

When summarized in a table, it is shown in Table 1 below.

In Table 1, A refers to a first unit cell located on the left side of FIG. 11, B refers to a second unit cell located on the upper right side of FIG. 11, and C refers to FIG. It means the third unit cell located at the bottom right.

In addition, Mode1 1 to Model 9 is a combination of each unit cell of a 0° rotation state, a 30° rotation state, and a 60° rotation state, as shown in Table 1 above.For example, in the case of Model 1, the first The unit cell, the second unit cell, and the third unit cell are all positioned in a 0° rotation state, and a structure in which three unit cells are continuous in plural.

In addition, in the case of Model 2, the first unit cell and the second unit cell are located in a 0° rotation state, and the third unit cell is located in a 30° rotation state, and a structure in which a plurality of three unit cells are continuous. .

Hereinafter, Model 3 to Model 9 may also be defined in the same manner as described above.

12 is a schematic diagram showing an example of a sandwich panel including a unit cell according to the present invention. However, in FIG. 12, for convenience of explanation, an example of a sandwich panel including a unit cell is shown, but unlike this, through a structure in which a plurality of unit cells in FIG. 11 are continuous as described above, as will be described later. It is natural that the same sandwich panel can be constructed.

Referring to FIG. 12, an example 1000 of a sandwich panel including a unit cell according to the present invention includes a unit cell 10; A first plate portion 1100 positioned above the unit cell 10; And a second plate portion 1200 positioned under the unit cell 10.

That is, in the example of the sandwich panel according to the present invention, by including the unit cell 10 described above, it is possible to provide a sandwich panel in which rigidity can be maintained while achieving weight reduction.

Meanwhile, in the sandwich panel according to the present invention, the first plate portion and the second plate portion may be formed by 3D printing.

As is well known, the 3D printing method corresponds to a technique of printing through the 3-axis movement of the X-axis, Y-axis and Z-axis compared to the conventional 2D printing method that prints through the two-axis motion of the X-axis and the Y-axis.

The 3D printing method includes various printing methods according to a lamination method or a method of creating a shape, and for example, there may be a rapid prototyping method and an FDM method.

The rapid prototyping method is a method of three-dimensional design with software, and then stacking several layers of powder or liquid solidified to print in three dimensions, and the FDM (Fused Deposition Modeling) method melts at a constant high temperature. It corresponds to a method of sequentially stacking and forming materials that have been changed to state.

However, in the present invention, the type of the 3D printing method is not limited, and a first plate part and a second plate part according to the present invention may be formed by using a known 3D printer.

In addition, for information on the 3D printing method, refer to the following documents.

-3D printing technology-ASTM F43 sub-committee on terminology (F2792)

-Large, Hollow Metal Parts by 3D Printing-Copyright 1989-2000, 3DPTM Laboratory, MIT

For example, in the present invention, the first plate part and the second plate part may be manufactured by using the SLS method (Selective Laser Sintering) among 3D printing methods.

That is, powder is provided through a powder providing unit that provides raw materials in a powder state, and a laser provided through a light source providing unit is irradiated to the powder, while changing the powder to a molten state, while changing the first plate unit and the second plate unit. Can be formed.

On the other hand, the raw materials provided from the powder providing unit may use the raw materials shown in Table 2 as follows (source of raw materials: company name EOS GmbH-Electro Optical Systems), but is not limited to the kind of the raw materials in the present invention. , If necessary, the type of raw material can be different.

material Stainless Steel 17-4 (GP1) Stainless Steel 15-5 (PH1) Cobalt Chrome (MP1) Maraging Steel (MS1)(Tooling Steel) Titanium Alloy (Ti64) Aluminum (AlSi10mg) Nickel Alloy (IN625)(Inconel) Nickel Alloy (IN718) (Inconel)

As described above, in the present invention, the base frame 100 of the hexagonal column shape; And through the unit cell 10 of the structure including the inner frame 200 located in the inner region of the base frame 100, the unit cell that can prevent the strength decrease and the rigidity is weakened, and It is possible to manufacture a sandwich plate containing.

Hereinafter, the stress of the sandwich plate according to the present invention will be described.

In order to compare the stress of the sandwich plate according to the present invention, the embodiment of the unit cell according to the present invention and the unit cell in a state in which the inner frame is excluded from the unit cell according to the present invention, that is, the shape as in FIG. A comparative example was analyzed as a unit cell.

13 is a photograph showing the stress distribution of the sandwich plate according to the comparative example, and FIG. 14 is a graph showing the stress distribution of the sandwich plate according to the comparative example.

In FIGS. 13 and 14, SWH refers to a unit cell in a state in which the inner frame is excluded from the unit cell according to the present invention as described above, and the thicknesses of 1mm, 2mm, and 3mm are shown in FIG. 12 as described above. It means the thickness of each of the first plate part and the second plate part.

In addition, in FIGS. 13 and 14, stress was measured over three steps (initial yielding poing, 15% strain, and 25% strain).

13 and 14, in the case of the comparative example, when the thickness of the plate portion is 1 mm, the stress characteristic was not very good, and when the thickness of the plate portion is changed from 1 mm to 2 mm, about 4 times the stress characteristic In addition, when the thickness of the plate portion was changed from 1 mm to 3 mm, the stress characteristics were improved by about 6 times.

15 is a photograph showing the stress distribution of the sandwich plate including the unit cell according to the present invention, Figure 16 is a graph showing the stress distribution of the sandwich plate including the unit cell according to the present invention.

In FIGS. 15 and 16, HSWH refers to a unit cell according to the present invention as described above, and that the thicknesses of 1mm, 2mm, and 3mm are respectively the first and second plate parts in FIG. 12 as described above. Means the thickness of.

In addition, in FIGS. 15 and 16, the stress was measured over three steps (initial yielding poing, 15% strain, and 25% strain).

15 and 16, in the case of a sandwich plate including a unit cell according to the present invention, when the thickness of the plate portion is 1 mm, it indicates that the stress characteristic is good, and the thickness of the plate material is 3 mm. In the case of, it can be seen that the stress corresponds to about 500 MPa, and the stress characteristics are significantly improved compared to the case where the thickness of the plate of the comparative example is 3 mm.

Thus, in the present invention, the base frame 100 of the hexagonal column shape; And through the unit cell 10 of the structure including the inner frame 200 located in the inner region of the base frame 100, the unit cell that can prevent the strength decrease and the rigidity is weakened, and It is possible to manufacture a sandwich plate containing.

17 is a graph showing the stress distribution of a sandwich plate including a plurality of unit cell structures according to the present invention.

Models 1 to 9 in FIG. 17 are the same as Models 1 to 9 in Table 1, and specific forms thereof may be referred to FIG. 11.

In addition, the thicknesses of 1mm, 2mm, and 3mm in FIG. 17 mean the respective thicknesses of the first and second plate portions in FIG. 12 as described above.

In addition, in Figure 17, the stress was measured over three steps (initial yielding poing, 15% strain, 25% strain).

Referring to FIG. 17, in the case of a sandwich plate including a plurality of unit cell structures according to the present invention, stress characteristics are significantly improved even compared to the stress of the sandwich plate including the unit cells according to the present invention of FIG. 16 described above. I can confirm.

Accordingly, in the present invention, through a sandwich plate material including a plurality of unit cell structures, it is possible to further prevent a decrease in strength and a sandwich plate material capable of preventing weakening of rigidity.

Although the embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You can understand that there is. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

Claims (15)

A hexagonal column-shaped base frame; And
Including an inner frame located in the inner region of the base frame,
The inner frame is a unit cell, characterized in that the cross section of the frame structure of the "H" shape. The method of claim 1,
The base frame, the upper surface; A first side surface including a lower surface facing the upper surface and continuously located between a first side of the upper surface and a first side of the lower surface; A second side surface continuously positioned between the second side of the upper surface and the second side of the lower surface; A third side surface continuously positioned between the third side of the upper surface and the third side of the lower surface; A fourth side surface positioned facing the first side surface and continuously positioned between a fourth side of the upper surface and a fourth side of the lower surface; A fifth side surface positioned facing the second side surface and continuously positioned between a fifth side of the upper surface and a fifth side of the lower surface; And a sixth side surface positioned facing the third side surface and continuously positioned between a sixth side of the upper surface and a sixth side of the lower surface. The method of claim 2,
The base frame includes 6 upper vertices and 6 lower vertices,
The six upper vertices may include an upper first vertex in a counterclockwise direction; An upper second vertex positioned apart from the upper first vertex and positioned adjacent to the upper first vertex; An upper third vertex positioned apart from the upper second vertex and adjacent to the upper second vertex; An upper fourth vertex positioned apart from the upper third vertex and adjacent to the upper third vertex; An upper fifth vertex positioned apart from the upper fourth vertex and adjacent to the upper fourth vertex; And a sixth vertex positioned apart from the upper fifth vertex and positioned adjacent to the upper fifth vertex,
In addition, the six lower vertices may include a lower first vertex in a counterclockwise direction; A lower second vertex positioned to be spaced apart from the lower first vertex and adjacent to the lower first vertex; A lower third vertex positioned apart from the lower second vertex and adjacent to the lower second vertex; A lower fourth vertex positioned apart from the lower third vertex and positioned adjacent to the lower third vertex; A lower fifth vertex positioned to be spaced apart from the lower fourth vertex and adjacent to the lower fourth vertex; And a sixth vertex positioned to be spaced apart from the lower fifth vertex and adjacent to the lower fifth vertex. The method of claim 3,
The base frame includes 6 upper segment, 6 lower segment and 6 side segment,
The six upper line segments may include: an upper first line segment connecting the upper first vertex and the upper second vertex based on a counterclockwise direction; An upper second line segment connecting the upper second vertex and the upper third vertex; An upper third line segment connecting the upper third vertex and the upper fourth vertex; An upper fourth line segment connecting the upper fourth vertex and the upper fifth vertex; An upper fifth line segment connecting the upper fifth vertex and the upper sixth vertex; And an upper sixth line segment connecting the upper sixth vertex and the upper first vertex,
In addition, the six lower line segments may include: a lower first line segment connecting the lower first vertex and the lower second vertex based on a counterclockwise direction; A lower second line segment connecting the lower second vertex and the lower third vertex; A lower third line segment connecting the lower third vertex and the lower fourth vertex; A lower fourth line segment connecting the lower fourth vertex and the lower fifth vertex; A lower fifth line segment connecting the lower fifth vertex and the lower sixth vertex; And a lower sixth line segment connecting the lower sixth vertex and the lower first vertex,
In addition, the six side segment may include a first side segment connecting the upper first vertex and the lower first vertex in a counterclockwise direction; A side second line segment connecting the upper second vertex and the lower second vertex; A third line segment connecting the upper third vertex and the lower third vertex; A fourth line segment connecting the upper fourth vertex and the lower fourth vertex; A fifth line segment connecting the upper fifth vertex and the lower fifth vertex; And a sixth line segment connecting the upper sixth vertex and the lower sixth vertex. The method of claim 4,
The inner frame includes a first flange portion positioned on a first side; A second flange portion spaced apart from the first flange portion by a predetermined interval; And a web portion connecting the first flange portion and the second flange portion. The method of claim 5,
The first flange portion may include a first line segment in the upper y direction; A lower y-direction first line segment facing the upper y-direction first line segment); One side z-direction first line segment connected to one side of the upper y-direction first line segment and the other side connected to one side of the lower y-direction first line segment; And a first line segment in the z-direction on the other side, located facing the first line segment in the z-direction, and one side is connected to the other side of the first line segment in the upper y-direction, and the other side is connected to the other side of the first line segment in the lower y-direction. and,
The second flange portion may include a second line segment in the upper y direction; A lower y-direction second line segment facing the upper y-direction second line segment; One side z-direction second line segment connected to one side of the upper y-direction second line segment and the other side connected to one side of the lower y-direction second line segment; And a second line segment in the z direction located facing the second line segment in the z direction, and one side is connected to the other side of the second line segment in the upper y direction, and the other side is connected to the other side of the second line segment in the lower y direction. And
The web portion includes: a first line segment in the upper x direction; A lower x-direction first line segment facing the upper x-direction first line segment; One side z-direction third line segment connected to one side of the upper x-direction first line segment and the other side connected to one side of the lower x-direction first line segment; And a third line segment in the z direction located facing the third line segment in the z direction, and one side is connected to the other side of the first line segment in the upper x direction, and the other side is connected to the other side of the first line segment in the lower x direction. Unit cell. The method of claim 6,
The one side z-direction third line segment of the web part is connected in contact with the first flange part, and the other side z direction third line part of the web part is connected in contact with the second flange part, so that the web part is connected to the first flange part. Unit cell, characterized in that connected to the flange portion and the second flange portion. A first unit cell including a first base frame having a hexagonal column shape, and a first inner frame positioned in an inner region of the first base frame;
A second unit cell including a second base frame having a hexagonal column shape, and a second inner frame positioned in an inner region of the second base frame; And
A plurality of unit cell structures including a third unit cell including a third base frame having a hexagonal column shape and a third inner frame positioned in an inner region of the third base frame. The method of claim 8,
The first inner frame, the second inner frame, and the third inner frame is a multi-unit cell structure, characterized in that the frame structure having a "H" shape in cross section. The method of claim 9,
The multiple unit cell structure is a structure in which a plurality of three unit cells are continuous,
In a structure in which a plurality of the three unit cells are continuous, based on a plan view, the first unit cell contacts the second unit cell and the third unit cell, and the second unit cell is the first unit cell. And a structure in contact with the third unit cell, wherein the third unit cell is in contact with the first unit cell and the second unit cell. The method of claim 9,
The first base frame includes a first upper surface, a first lower surface, a 1-1 side, a 1-2 side, a 1-3 side, a 1-4 side, a 1-5 side, and a 1-6 Contains eight sides of the side,
The second base frame includes a second upper surface, a second lower surface, a 2-1 side, a 2-2 side, a 2-3 side, a 2-4 side, a 2-5 side, and a 2-6 side. It contains 8 sides of the side,
The third base frame includes a third upper surface, a third lower surface, a 3-1 side, a 3-2 side, a 3-3 side, a 3-4 side, a 3-5 side, and a 3-6 side. Contains eight sides of the side,
The multiple unit cell structure is a structure in which a plurality of three unit cells are continuous,
In a structure in which a plurality of the three unit cells are continuous, the 1-3 side surfaces of the first base frame are in contact with the 2-6 side surfaces of the second base frame, and the 1-2 pieces of the first base frame The side surface is in contact with the 3-5 side of the third base frame, and the 2-1 side of the second base frame is a plurality of features in a structure in contact with the 3-4 side of the third base frame. Unit cell structure. The method of claim 10 or 11,
The first base frame includes a side 1-1 line segment, a side 1-2 line segment, a side 1 3 line segment, a side 1-4 line segment, a side 1-5 line segment, and a side 1-6 line segment Contains six side segments
The second base frame includes a side 2-1 segment, a side 2-2 segment, a side 2-3 segment, a side 2-4 segment, a side 2-5 segment, and a side 2-6 segment. It contains 6 side segments
The third base frame includes a side 3-1 segment, a side 3-2 segment, a side 3-3 segment, a side 3-4 segment, a side 3-5 segment, and a side 3-6 segment. A plurality of unit cell structures including six side segments. The method of claim 12,
Each of the first inner frame, the second inner frame, and the third inner frame may include: a first flange portion positioned on a first side; A second flange portion spaced apart from the first flange portion by a predetermined interval; And a web portion connecting the first flange portion and the second flange portion,
The first flange portion may include a first line segment in the upper y direction; A lower y-direction first line segment facing the upper y-direction first line segment); One side z-direction first line segment connected to one side of the upper y-direction first line segment and the other side connected to one side of the lower y-direction first line segment; And a first line segment in the z-direction on the other side, located facing the first line segment in the z-direction, and one side is connected to the other side of the first line segment in the upper y-direction, and the other side is connected to the other side of the first line segment in the lower y-direction. and,
The second flange portion may include a second line segment in the upper y direction; A lower y-direction second line segment facing the upper y-direction second line segment; One side z-direction second line segment connected to one side of the upper y-direction second line segment and the other side connected to one side of the lower y-direction second line segment; And a second line segment in the z direction located facing the second line segment in the z direction, and one side is connected to the other side of the second line segment in the upper y direction, and the other side is connected to the other side of the second line segment in the lower y direction. And
The web portion includes: a first line segment in the upper x direction; A lower x-direction first line segment facing the upper x-direction first line segment; One side z-direction third line segment connected to one side of the upper x-direction first line segment and the other side connected to one side of the lower x-direction first line segment; And a third line segment in the z direction located facing the third line segment in the z direction, and one side is connected to the other side of the first line segment in the upper x direction, and the other side is connected to the other side of the first line segment in the lower x direction. Multiple unit cell structure. The method of claim 13,
The first base frame and the first inner frame of the first unit cell are disposed in at least one of a 0° rotation state, a 30° rotation state, and a 60° rotation state,
The second base frame and the second inner frame of the second unit cell are disposed in at least one of a 0° rotation state, a 30° rotation state, and a 60° rotation state,
The third base frame and the third inner frame of the third unit cell are arranged in at least one of a 0° rotation state, a 30° rotation state, and a 60° rotation state. . The method of claim 14,
The 0° rotation state means a reference point in a certain state in which the inner frame located in the inner region of the base frame is located,
The 30° rotation state refers to a state in which the inner frame rotates 30° in the inner region of the base frame based on the 0° rotation state, which is a reference point,
The 60° rotation state refers to a state in which the inner frame rotates by 60° in the inner region of the base frame based on the 0° rotation state as a reference point.

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