CN115556427A - Composite material three-dimensional lattice structure based on mortise and tenon connection and preparation method thereof - Google Patents
Composite material three-dimensional lattice structure based on mortise and tenon connection and preparation method thereof Download PDFInfo
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Abstract
A composite material three-dimensional lattice structure based on mortise and tenon connection and a preparation method thereof particularly relate to the technical field of materials. The invention aims to solve the problem that the existing composite material lattice structure is difficult to prepare in large scale. The lattice structure comprises a core body, wherein the core body comprises a plurality of tenon type single cells and a plurality of mortise type single cells, the plurality of tenon type single cells and the plurality of mortise type single cells are alternately arranged in a lattice shape, and two adjacent tenon type single cells and the mortise type single cells are connected in an inserted mode.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a composite material three-dimensional lattice structure based on mortise and tenon connection and a preparation method thereof.
Background
With the rapid development of aerospace technology, the ultra-high speed aircraft has urgent needs for light weight and multiple functions. The lattice structure is a novel light structure, not only has higher bearing performance, but also has the structure-function integration characteristics of bearing, stealth, vibration reduction, noise reduction, energy absorption, thermal control and the like easily realized by the through and open space inside the lattice structure. Compared with the traditional metal material lattice structure, the composite material lattice structure prepared by the composite material with high specific strength and high specific rigidity has more excellent mechanical property and light weight. The existing main preparation method of the lattice structure of the composite material has the following limitations: 1. a sewing and knitting process, which is complicated to operate and the size of the resulting structure is limited by the size of the knitting equipment; 2. in the vacuum auxiliary forming technology, the difficulty of flow channel design and sealing design of a mould is high, and the size of a test piece is limited by curing equipment; 3. the co-curing mould pressing process has the advantages that the radial forming pressure of the fiber column is not easy to control and the process is complex; 4. the interlocking assembly method can not ensure the forming quality of a large-size structure because the integral error of the fillet is gradually accumulated along with the increase of the number of the unit cells; 5. the composite material 3D printing technology is still rarely applied due to high technical difficulty at present and cannot prepare large components due to the size limitation of a printing machine tool. In summary, the existing main preparation methods cannot prepare large-sized structural members or cannot ensure the forming stability and robustness of the large-sized structural members due to various technical limitations. In addition, in consideration of the use scene of actual engineering, the existing preparation technology has the important application defect that the prepared large-scale structure is difficult to transport in a long distance or even across the planet. The problem seriously affects the practical application of the composite material three-dimensional lattice structure in the industrial fields of aerospace, transportation, national defense, biomedical treatment, energy, mechanical equipment, lunar exploration engineering and the like.
Disclosure of Invention
The invention provides a composite material three-dimensional lattice structure based on mortise and tenon connection and a preparation method thereof, aiming at solving the problem that the existing composite material lattice structure is difficult to prepare in large scale.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a combined material three-dimensional lattice structure based on mortise-tenon joint includes the core, and the core includes a plurality of tenon type unit cells and a plurality of mortise type unit cells, and a plurality of tenon type unit cells and a plurality of mortise type unit cells are the dot matrix form and set up in turn, cartridge connection between two adjacent tenon type unit cells and the mortise type unit cell.
Furthermore, the tenon type unit cell comprises a plurality of tenon type rod elements, the plurality of tenon type rod elements are spliced into a polyhedral structure, each tenon type rod element comprises a tenon type rod body and two tenon type rod element connecting ends, the tenon type rod element connecting ends are fixedly connected to two ends of the tenon type rod body respectively, a tenon type rod element tenon type joint is arranged on one longitudinal connecting end face of each tenon type rod element connecting end along the transverse direction, a tenon type rod element mortise type groove is arranged on the other longitudinal connecting end face of each tenon type rod element connecting end along the transverse direction, and in every two adjacent tenon type rod elements, the tenon type rod element tenon type joints of the tenon type rod element connecting ends are inserted into the tenon type rod element mortise type grooves of the adjacent tenon type rod element connecting ends.
Furthermore, the single-cell type of fourth of twelve earthly branches includes many fourth of twelve earthly branches type pole units, many fourth of twelve earthly branches type pole units splice into polyhedral structure, fourth of twelve earthly branches type pole unit includes the fourth of twelve earthly branches type body of rod and two fourth of twelve earthly branches type pole unit connection ends, fourth of twelve earthly branches type pole unit connection end rigid coupling respectively is at the both ends of fourth of twelve earthly branches type body of rod, be equipped with fourth of twelve earthly branches type pole unit tenon type joint along the transverse direction on the longitudinal connection terminal surface of fourth of twelve earthly branches type pole unit connection end, along the transverse direction be equipped with fourth of twelve earthly branches type pole unit fourth of rod unit type groove on another longitudinal connection terminal surface of fourth of twelve earthly branches type pole unit connection end, in every two adjacent fourth of twelve earthly branches type pole unit, fourth of twelve earthly branches type pole unit connection end mortise type pole unit tenon type joint cartridge is in the fourth of twelve earthly branches type pole unit connection end of adjacent fourth of rod unit.
Furthermore, cell element connecting tenon-type joints are arranged on the end face, on the outer side of the tenon-type rod element connecting end, of each tenon-type rod element, cell element connecting mortise-type grooves are arranged on the end face, on the outer side of the mortise-type rod element connecting end, of each mortise-type rod element, and cell element connecting tenon-type joints of the tenon-type rod element connecting end are inserted into the cell element connecting mortise-type grooves of the adjacent mortise-type rod element connecting end.
Furthermore, a tenon-shaped rod element transition chamfer is arranged between the tenon-shaped rod element connecting end and the tenon-shaped rod body; be equipped with fourth of twelve earthly branches type pole first transition chamfer between fourth of twelve earthly branches type pole first connection end and the fourth of twelve earthly branches type pole body.
Furthermore, the composite material three-dimensional lattice structure based on the mortise-tenon joint further comprises two skins, and the skins are fixedly connected to the outer side of the core body.
Furthermore, the skin is connected with the tenon-and-mortise unit cells of the core body through tenon-and-mortise joints.
Further, the core body is filled with a vibration damping and energy absorbing layer.
A preparation method of a composite material three-dimensional lattice structure based on mortise and tenon connection comprises the following steps:
step one, connecting a plurality of tenon-shaped rod elements into a tenon-shaped unit cell with a polyhedral structure; connecting a plurality of mortise type rod elements into a polyhedron-structured mortise type unit cell;
and step two, alternately arranging and connecting the plurality of tenon type unit cells and the plurality of mortise type unit cells to form a core body with a three-dimensional lattice-shaped structure.
Furthermore, in the first step, in every two adjacent tenon-shaped rod elements, inserting tenon-shaped rod element tenon-shaped joints at the connecting ends of the tenon-shaped rod elements into tenon-shaped rod element mortise-shaped grooves at the connecting ends of the adjacent tenon-shaped rod elements; inserting a mortise type rod element tenon type joint of a mortise type rod element connecting end into a mortise type rod element mortise type groove of a connecting end of every two adjacent mortise type rod elements;
in the second step, the cell element connecting tenon type joint of the tenon type rod element connecting end is inserted into the cell element connecting mortise type groove of the adjacent mortise type rod element connecting end between the adjacent tenon type unit cells and the mortise type unit cells.
Compared with the prior art, the invention has the following beneficial effects:
the three-dimensional lattice structure based on tenon-and-mortise splicing provided by the invention is easy to carry out full-automatic mechanical production, is beneficial to manufacturing standard components, is convenient for long-distance transportation and assembling a large-scale structure on site, is also convenient for carrying out later operations such as replacement and maintenance on damaged components, can carry out large-scale production, and can greatly reduce various costs of the whole circulation links such as preparation, transportation, repair and assembly of the structure.
All the parts of the invention are assembled in two orthogonal planes, and the load is transmitted along the two orthogonal planes along the lattice rod system without generating the load transmission of out-of-plane or out-of-plane, thus improving the bearing capacity and efficiency of the structure and being beneficial to light weight. The assembled and matched lattice structure can be used as a bearing component of various loads independently, and can also be combined with a semi-rigid skin or a rigid panel to form a lattice sandwich structure for bearing, but the shape keeping property and the bearing capacity of the lattice bar system are not completely dependent on the skin or the panel. The large-size structural part is easy to prepare; the field operation is simple, and the manufacturing convenience is ensured; the components are easy to standardize and refine, and the reliability and robustness of the structure are improved; the difficulty and the cost of long-distance transportation of a large-scale structure are reduced.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional lattice of a composite material based on mortise and tenon joint;
FIG. 2 is a schematic diagram of the tenon-type unit cell 13 according to the present invention;
FIG. 3 is a schematic structural diagram of a T-shaped unit cell 14 according to the present invention;
FIG. 4 is a schematic structural view of the tenon type rod unit 1 according to the present invention;
FIG. 5 is a front view of the connecting end of the tenon type rod element 1 according to the present invention;
FIG. 6 is a rear view of the connecting end of the tenon type rod element 1 according to the present invention;
FIG. 7 is a right side view of the tenon type element connecting end of tenon type element 1 of the present invention;
FIG. 8 is a left side view of the connecting end of the tenon type element of tenon type element 1 of the present invention;
FIG. 9 is a schematic structural view of a mortise type rod element 6 in the invention;
FIG. 10 is a front view of a connecting end of a mortise type rod element 6 in the mortise type rod element of the present invention;
FIG. 11 is a rear view of a connecting end of a T-shaped rod element in the T-shaped rod element 6 according to the present invention;
FIG. 12 is a right side view of a connecting end of a T-shaped rod element in the T-shaped rod element 6 according to the present invention;
FIG. 13 is a left side view of a connecting end of a mortise type rod element 6 in the mortise type rod element of the present invention;
fig. 14 is a structural assembly view of the tenon type rod unit 1 according to the present invention;
FIG. 15 is a structural assembly drawing of the mortise type rod element 6 in the present invention;
FIG. 16 is a schematic diagram of a preparation process of a three-dimensional lattice structure of a composite material based on mortise and tenon connection according to the present invention;
FIG. 17 is a schematic structural diagram of a composite material three-dimensional lattice sandwich board based on mortise and tenon joint in the invention.
Wherein: 1-tenon type rod element; 2-tenon type rod element tenon type joint; 3-cell element connecting tenon type joints; 4-tenon type rod element-mortise type grooves; 5-excessive chamfering of the tenon-shaped rod element; 6-T-shaped rod element; 7-mortise type pole element tenon type joint; 8-cell element connection mortise type grooves; 9-mortise type rod element mortise type grooves; 10-T-shaped transition chamfering of the rod elements; 11-assembled cell element connecting tenon type joints; 12-connecting the mortise type groove by using the combined cell element; 13-tenon-type unit cell; 14-Mao type unit cell; 15-covering.
Detailed Description
The first specific implementation way is as follows: the embodiment is described with reference to fig. 1 to 17, and the three-dimensional lattice structure of the composite material based on the mortise-tenon joint in the embodiment includes a core, where the core includes a plurality of tenon-type unit cells 13 and a plurality of mortise-type unit cells 14, the plurality of tenon-type unit cells 13 and the plurality of mortise-type unit cells 14 are alternately arranged in a lattice shape, and two adjacent tenon-type unit cells 13 and two mortise-type unit cells 14 are connected in a plug-in manner.
The tenon-type unit cells 13 and the mortise-type unit cells 14 are alternately arranged in a lattice shape to form a three-dimensional lattice-shaped core body.
The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 17, in the embodiment, the tenon type unit cell 13 includes a plurality of tenon type rod elements 1, the plurality of tenon type rod elements 1 are spliced to form a polyhedral structure, each tenon type rod element 1 includes a tenon type rod body and two tenon type rod element connection ends, the tenon type rod element connection ends are respectively and fixedly connected to two ends of the tenon type rod body, a longitudinal connection end face of each tenon type rod element connection end is provided with a tenon type rod element tenon type joint 2 along a transverse direction, another longitudinal connection end face of each tenon type rod element connection end is provided with a tenon type rod element mortise type groove 4 along a transverse direction, and in every two adjacent tenon type rod elements 1, the tenon type rod element tenon type joint 2 of each tenon type rod element connection end is inserted into the tenon type rod element mortise type groove 4 of the adjacent tenon type rod element connection end. Technical features not disclosed in the present embodiment are the same as those of the first embodiment.
The design realizes the tenon-and-mortise connection fixation among a plurality of tenon-shaped rod elements 1 to form a tenon-shaped unit cell 13 with stable structure.
The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 17, in this embodiment, each mortise type unit cell 14 includes a plurality of mortise type rod elements 6, the plurality of mortise type rod elements 6 are spliced to form a polyhedral structure, each mortise type rod element 6 includes a mortise type rod body and two mortise type rod element connection ends, each mortise type rod element connection end is fixedly connected to two ends of each mortise type rod body, a mortise type rod element tenon type joint 7 is arranged on one longitudinal connection end face of each mortise type rod element connection end along the transverse direction, a mortise type rod element mortise type groove 9 is arranged on the other longitudinal connection end face of each mortise type rod element connection end along the transverse direction, and in every two adjacent mortise type rod elements 6, each mortise type rod element tenon type joint 7 of each mortise type rod element connection end is inserted into each mortise type rod element mortise type groove 9 of each adjacent mortise type rod element connection end. The technical features not disclosed in the present embodiment are the same as those of the second embodiment.
The design is so as to realize the mortise and tenon joint between a plurality of mortise type rod elements 6 and fix, and form a mortise type single cell 14 with stable structure.
The fourth concrete implementation mode: referring to fig. 1 to 17, the embodiment is described, in the embodiment, a cell element connecting tenon type joint 3 is provided on an outer end face of a tenon type rod element connecting end of a tenon type rod element 1 along a longitudinal direction, a cell element connecting mortise type groove 8 is provided on an outer end face of a mortise type rod element connecting end of a mortise type rod element 6 along the longitudinal direction, a cell element connecting tenon type joint 3 of the tenon type rod element connecting end is inserted into a cell element connecting mortise type groove 8 of the adjacent mortise type rod element connecting end between adjacent tenon type unit cells 13 and mortise type unit cells 14. The technical features not disclosed in the present embodiment are the same as those of the third embodiment.
The plurality of cell connection tenon type joints 3 at the end part of the tenon type unit cell 13 are spliced into a combined cell connection tenon type joint 11, and the plurality of cell connection mortise type grooves 8 at the end part of the mortise type unit cell 14 are spliced into a combined cell connection mortise type groove 12. The combined cell connecting tenon type joint 11 is inserted in the combined cell connecting mortise type groove 12.
The design is carried out in such a way that the tenon-and-mortise connection between the tenon-and-mortise type unit cell 13 and the mortise-and-mortise type unit cell 14 is realized.
The tenon-type rod element 1 and the mortise-type rod element 6 can be integrally formed by utilizing a vacuum auxiliary forming technology, and can also be manufactured by cutting and carving a laminated plate and other forms, and the basic material can be reinforced thermoplastic or thermosetting composite materials such as carbon fiber, glass fiber, aramid fiber and the like.
The tenon type unit cell 13 and the mortise type unit cell 14 are made of the same or different materials, and the tenon type rod element 1 and the mortise type rod element 6 are made of the same or different materials, so that a composite material three-dimensional lattice structure with diversity and material gradient is formed.
The fifth concrete implementation mode: with reference to fig. 1 to 17, the embodiment is described, and a tenon-type rod element transition chamfer 5 is arranged between the tenon-type rod element connecting end and the tenon-type rod body; be equipped with fourth of twelve earthly branches type pole first transition chamfer 10 between fourth of twelve earthly branches type pole first connection end and the fourth of twelve earthly branches type pole body. The technical features not disclosed in the present embodiment are the same as those of the fourth embodiment.
The sixth specific implementation mode: the embodiment is described with reference to fig. 1 to 17, and the three-dimensional lattice structure of a composite material based on mortise and tenon connection further includes two skins 15, and the skins 15 are fixedly connected to the outer side of the core body. The technical features not disclosed in this embodiment are the same as those of the first, second, third, fourth or fifth embodiment.
The design sets up the covering on the basis of the core, makes it form a combined material three-dimensional dot matrix sandwich panel structure based on mortise-tenon joint.
The seventh embodiment: the present embodiment is described with reference to fig. 1 to 17, and the skin 15 and the tenon-and-mortise type unit cells 13 and 14 of the core are connected by mortise and tenon joints. The technical features not disclosed in the present embodiment are the same as those of the sixth embodiment.
A rigid or semi-rigid panel skin 15 can be arranged outside the core body; the skin 1 and the assembled three-dimensional lattice core made of the composite material can still be subjected to mortise and tenon connection in a manner of imitating connection among cells, so that lattice nodes are connected with the panel, when the structure is loaded, bending moment loads and force loads can be transmitted, and the mortise and tenon connection plays a role of a load transmission bridge of the panel skin and the core. The rigid or semi-rigid panel skin may be selected from metal, composite, textile, etc.
The specific implementation mode is eight: the present embodiment is described with reference to fig. 1 to 17, and the core of the present embodiment is filled with a vibration damping and energy absorbing layer. The technical features not disclosed in this embodiment are the same as those in the seventh embodiment.
The composite material three-dimensional lattice structure can be filled with damping energy absorption layers made of damping silica gel foam, polyurethane, asbestos, rubber, ceramic and the like. By the arrangement, the multifunctional application of improving structural damping, vibration attenuation, noise reduction, buffering, energy absorption, wave absorption, stealth, thermal control and the like can be achieved.
The specific implementation method nine: the embodiment is described with reference to fig. 1 to 17, and the method for preparing the composite material three-dimensional lattice structure based on the mortise and tenon joint in the embodiment comprises the following steps:
firstly, connecting a plurality of tenon-shaped rod elements 1 into a tenon-shaped unit cell 13 with a polyhedral structure; connecting a plurality of T-shaped rod elements 6 into a T-shaped unit cell 14 with a polyhedral structure;
and step two, alternately arranging and connecting the plurality of tenon type unit cells 13 and the plurality of mortise type unit cells 14 into a core body with a three-dimensional lattice-shaped structure.
The preparation process in the embodiment can be performed by a manipulator or manually.
During preparation, a plurality of tenon type unit cells 13 and a plurality of mortise type unit cells 14 with proper quantity are selected according to the overall dimension of a structure to be prepared, and the distribution conditions are planned and arranged, so that the overall dimension meets the requirements.
The detailed implementation mode is ten: in the first step of the present embodiment, referring to fig. 1 to fig. 17, in every two adjacent tenon-type rod elements 1, the tenon-type joint 2 of the tenon-type rod element connecting end is inserted into the mortise-type groove 4 of the tenon-type rod element of the connecting end of the adjacent tenon-type rod element; inserting a mortise-type rod element tenon-type joint 7 of a connecting end of a mortise-type rod element into a mortise-type rod element mortise-type groove 9 of a connecting end of every two adjacent mortise-type rod elements 6;
in the second step, the cell element connecting tenon type joint 3 of the tenon type rod element connecting end is inserted into the cell element connecting mortise type groove 8 of the adjacent mortise type rod element connecting end between the adjacent tenon type unit cell 13 and the mortise type unit cell 14.
Technical features not disclosed in the present embodiment are the same as those in the ninth embodiment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a combined material three-dimensional lattice structure based on mortise-tenon joint which characterized in that: the core comprises a plurality of tenon type unit cells (13) and a plurality of mortise type unit cells (14), wherein the plurality of tenon type unit cells (13) and the plurality of mortise type unit cells (14) are alternately arranged in a lattice shape, and two adjacent tenon type unit cells (13) and the mortise type unit cells (14) are connected in a plug-in mode.
2. The three-dimensional lattice structure of the composite material based on the mortise and tenon joint as claimed in claim 1, wherein: tenon type unit cell (13) include many tenon type pole unit (1), many tenon type pole unit (1) splice into polyhedral structure, tenon type pole unit (1) is including the tenon type body of rod and two tenon type pole unit connection ends, tenon type pole unit connection end rigid coupling respectively is at the both ends of the tenon type body of rod, be equipped with tenon type pole unit tenon type joint (2) along the transverse direction on the vertical connection terminal surface of tenon type pole unit connection end, be equipped with tenon type pole unit mortise type recess (4) along the transverse direction on another vertical connection terminal surface of tenon type pole unit connection end, in every two adjacent tenon type pole unit (1), tenon type pole unit tenon type joint (2) cartridge of tenon type pole unit connection end is in tenon type pole unit mortise type recess (4) of adjacent tenon type pole unit connection end.
3. The three-dimensional lattice structure of the composite material based on the mortise and tenon joint as claimed in claim 2, wherein: the T-shaped single cell (14) comprises a plurality of T-shaped rod elements (6), the T-shaped rod elements (6) are spliced into a polyhedral structure, each T-shaped rod element (6) comprises a T-shaped rod body and two T-shaped rod element connecting ends, the T-shaped rod element connecting ends are fixedly connected to two ends of the T-shaped rod body respectively, a T-shaped rod element tenon type joint (7) is arranged on one longitudinal connecting end face of each T-shaped rod element connecting end along the transverse direction, T-shaped rod element mortise type grooves (9) are formed in the other longitudinal connecting end face of each T-shaped rod element connecting end along the transverse direction, and in every two adjacent T-shaped rod elements (6), the T-shaped rod element tenon type joints (7) of each T-shaped rod element connecting end are inserted into T-shaped rod element mortise type grooves (9) of the T-shaped rod element connecting ends.
4. The three-dimensional lattice structure of the composite material based on the mortise and tenon joint as claimed in claim 3, wherein: cell element connecting tenon type joints (3) are arranged on the end face, on the outer side, of the tenon type rod element connecting end of the tenon type rod element (1) in the longitudinal direction, cell element connecting mortise type grooves (8) are arranged on the end face, on the outer side, of the mortise type rod element connecting end of the mortise type rod element (6) in the longitudinal direction, cell element connecting mortise type grooves (8) are arranged between adjacent tenon type single cells (13) and mortise type single cells (14), and the cell element connecting tenon type joints (3) of the tenon type rod element connecting end are inserted in the cell element connecting mortise type grooves (8) of the adjacent mortise type rod element connecting end.
5. The mortise and tenon connection-based composite material three-dimensional lattice structure of claim 4, wherein: a tenon-shaped rod element transition chamfer (5) is arranged between the tenon-shaped rod element connecting end and the tenon-shaped rod body; and a T-shaped rod element transition chamfer (10) is arranged between the T-shaped rod element connecting end and the T-shaped rod body.
6. The three-dimensional lattice structure of composite material based on mortise and tenon joint as claimed in claim 1, 2, 3, 4 or 5, wherein: the composite material three-dimensional lattice structure based on the mortise-tenon joint further comprises two skins (15), and the skins (15) are fixedly connected to the outer side of the core body.
7. The three-dimensional lattice structure of the composite material based on the mortise and tenon joint as claimed in claim 6, wherein: the skin (15) is connected with the tenon type unit cell (13) and the mortise type unit cell (14) of the core body through the tenon-and-mortise joint.
8. The three-dimensional lattice structure of the composite material based on the mortise and tenon joint as claimed in claim 7, wherein: and the core body is internally filled with a vibration-damping energy-absorbing layer.
9. The method for preparing the three-dimensional lattice structure of the composite material based on the mortise and tenon joint according to any one of claims 1 to 8 is characterized in that: the method comprises the following steps:
firstly, connecting a plurality of tenon-shaped rod elements (1) into a tenon-shaped unit cell (13) with a polyhedral structure; connecting a plurality of T-shaped rod elements (6) into T-shaped unit cells (14) with polyhedral structures;
and step two, alternately arranging and connecting a plurality of tenon type unit cells (13) and a plurality of mortise type unit cells (14) into a core body with a three-dimensional lattice structure.
10. The method for preparing the three-dimensional lattice structure of the composite material based on the mortise and tenon joint as claimed in claim 9, wherein the method comprises the following steps: in the first step, in every two adjacent tenon type rod elements (1), inserting tenon type rod element tenon type joints (2) at the connection ends of the tenon type rod elements into tenon type rod element mortise type grooves (4) at the connection ends of the adjacent tenon type rod elements; inserting a mortise-type rod element tenon-type joint (7) at the connecting end of the mortise-type rod element into a mortise-type rod element mortise-type groove (9) at the connecting end of the adjacent mortise-type rod elements in every two adjacent mortise-type rod elements (6);
in the second step, a cell element connecting tenon type joint (3) of the tenon type rod element connecting end is inserted into a cell element connecting mortise type groove (8) of the adjacent mortise type rod element connecting end between the adjacent tenon type unit cells (13) and the mortise type unit cells (14).
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