CN112918022A - Negative Poisson ratio-honeycomb type composite energy absorption structure with planar semi-circumferential forward interface - Google Patents
Negative Poisson ratio-honeycomb type composite energy absorption structure with planar semi-circumferential forward interface Download PDFInfo
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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Abstract
The invention relates to a negative Poisson ratio-honeycomb type composite energy absorption structure with a planar semi-circumferential cis-junction interface, which is provided with a honeycomb structure area and an inflected hexagonal negative Poisson ratio structure area which are positioned on the same plane and are alternately arranged, wherein the honeycomb structure area and the inflected hexagonal negative Poisson ratio structure area are in composite connection through a planar semi-circumferential cis-junction interface structure. Compared with the prior art, the interface structure formed by the invention has smaller thickness of the interface layer; if only the first closed edge L1 and the second closed edge L2 are arranged, the interface region of the interface structure part is an incomplete negative Poisson's ratio structure and is in mutual opposite action with the honeycomb structure, and part of the interface region is isolated from each other due to the influence of the interface layer, the two regions appear alternately, and some characteristics appear in the actual energy absorption process; if the first bottom connecting edge L3 and the second bottom connecting edge L4 are added, the alternating action disappears, and the interface becomes completely isolated and strengthened.
Description
Technical Field
The invention relates to the technical field of energy absorption structures, in particular to a negative Poisson's ratio-honeycomb type composite energy absorption structure with a planar semi-circumferential forward interface.
Background
Inspired by natural honeycombs, humans have surprisingly discovered, through long-term studies and analysis of the characteristics of natural honeycomb structures, that the structures have numerous excellent properties. Therefore, according to the bionics principle, people creatively invent various honeycomb composite structure materials and products thereof, open a new thought for the structural design in engineering, and effectively solve a plurality of problems in engineering. Compared with the same type of solid material structure, the strength-weight ratio and the rigidity-weight ratio of the honeycomb structure material are both superior in the existing material. The honeycomb structure has many excellent performances, and from the analysis of mechanics, the best mechanical property can be obtained with the minimum material to the closed hexagonal equilateral honeycomb structure compared with other structures, and when the honeycomb structure plate is subjected to the load perpendicular to the plate surface, the bending rigidity of the honeycomb structure plate is almost the same as that of a solid plate made of the same material and having the same thickness, even higher, but the weight of the honeycomb structure plate is 70-90% lighter, and the honeycomb structure plate is not easy to deform and break, and has the advantages of shock absorption, sound insulation, heat insulation and the like.
With the continuous development of science and technology, the preparation process of the honeycomb material gradually becomes mature, the manufacturing cost is greatly reduced, and the superiority of the honeycomb material in various industries is continuously reflected. Honeycomb materials typically exhibit macroscopically positive poisson's ratio, which results in transverse shrinkage when uniaxially stretched. Honeycomb materials with negative poisson's ratio effect are also emerging and used in succession.
Chinese patent CN109878443A discloses an energy absorption box based on an inner core with a concave polyhedral negative Poisson ratio three-dimensional structure, which comprises a front mounting plate fixedly connected with an automobile anti-collision beam, a rear mounting plate fixedly connected with an automobile longitudinal beam, an energy absorption box body and an inner core with a concave polyhedral negative Poisson ratio three-dimensional structure filled in the inner cavity of the energy absorption box body, wherein the inner core is formed by only adopting a concave polyhedral negative Poisson ratio single-cell structure in a three-dimensional array arrangement connection mode. The energy absorption effect needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a negative Poisson ratio-honeycomb type composite energy absorption structure with a planar semi-circumferential interface.
The purpose of the invention can be realized by the following technical scheme:
a negative Poisson ratio-honeycomb type composite energy absorption structure with a planar semi-circumferential cis-junction interface is provided with a honeycomb structure area and an inflected hexagonal negative Poisson ratio structure area which are positioned on the same plane and are alternately arranged, and the honeycomb structure area and the inflected hexagonal negative Poisson ratio structure area are in composite connection through the planar semi-circumferential cis-junction interface structure;
the honeycomb structure area consists of a plurality of layers of honeycomb layered monomers on the same plane, each layer of honeycomb layered (transverse layered monomer) monomer consists of a plurality of honeycomb monomers which are sequentially arranged and a honeycomb connecting wall which is connected at the position of a median line between two adjacent honeycomb monomers and is arranged in a shape like a Chinese character 'yi', and the two adjacent layers of honeycomb layered monomers are connected in a way that the bottom edges of the honeycomb monomers are superposed, so that countless layers of honeycomb structures can be formed by superposition;
the internal folding hexagonal negative Poisson ratio structure area consists of a plurality of internal folding hexagonal layered monomers positioned on the same plane, each internal folding hexagonal layered monomer consists of a plurality of internal folding hexagonal structural monomers which are sequentially arranged and a negative Poisson ratio connecting wall which is connected at the middle line between two adjacent internal folding hexagonal structural monomers and is arranged in a shape like a Chinese character 'yi', and the adjacent two internal folding hexagonal layered monomers are connected in a mode that the bottom edges of the internal folding hexagonal structural monomers are superposed with the bottom edges, so that countless internal folding hexagonal negative Poisson ratio structures can be folded;
the honeycomb monomers in the honeycomb structure area and the inward-folded hexagonal structure monomers in the inward-folded hexagonal negative poisson ratio structure area are correspondingly arranged one by one (namely one honeycomb monomer corresponds to one inward-folded hexagonal structure monomer);
removing honeycomb connection walls and most of honeycomb monomers (namely more than half of honeycomb monomers) close to one side of the inflected hexagonal negative Poisson ratio structure region from the direction parallel to the median line; removing negative Poisson ratio connecting walls and most of inwards folded hexagonal structure monomers (more than half of inwards folded hexagonal structure monomers) close to one side of the honeycomb structure region from the direction parallel to the median line of the inwards folded hexagonal layered monomers of the inwards folded hexagonal structure region close to the honeycomb structure region; the remaining small half part (less than half part) of the honeycomb single body and the remaining small half part (less than half part) of the folded hexagonal structure single body are provided with two connecting nodes (free ends formed by removing most of the structure);
a first penetrating closed edge L1 is added to the connecting nodes of the remaining small half part of the honeycomb single body, a second penetrating closed edge L2 is added to the connecting nodes of the remaining small half part of the folded hexagonal structure single body, and the two connecting nodes of the remaining small half part of the folded hexagonal structure single body are in butt joint connection with the two connecting nodes of the remaining small half part of the honeycomb single body to form a planar semi-circumferential compliant interface structure.
As a preferred technical solution of the present invention, the distance between adjacent connection nodes on the remaining small half of two adjacent honeycomb units is d1, and the distance between two connection nodes on the remaining small half of each honeycomb unit is d 2; the distance between adjacent connecting nodes on the remaining small half parts of the two adjacent inflected hexagonal structural single bodies is d1 ', and the distance between two connecting nodes on the remaining small half parts of each inflected hexagonal structural single body is d 2';
d1 ═ d1 'and d2 ═ d 2'.
As the preferred technical scheme of the invention, the honeycomb single body is composed of 2 bottom edges with the length of a and 4 side walls with the length of b, the length of a diagonal line parallel to the bottom edges is c, the included angle of two adjacent side walls is alpha, and the wall thickness is t; the length of the honeycomb connecting wall is a and is equal to the length of the bottom edge;
the inflected hexagonal structural monomer consists of 2 bottom edges with the length of c 'and 4 side walls with the length of b', the length of a diagonal line parallel to the bottom edges is a ', and the wall thickness is t'; the length of the connecting wall with the negative Poisson ratio is c' and is equal to the length of the bottom edge;
a＝a’，c＝c’，t＝t’。
in a preferred embodiment of the present invention, a ═ a ', c ═ c ', t ═ t ', b ═ b ', and α ═ α '.
As a preferable technical scheme of the invention, the distance between the first closed edge penetrating through the connecting node of the remaining small half part of the honeycomb single body and the median line of the honeycomb single body is e1, and the remaining small half part of the hexagonal structural single body is folded inwardsThe distance between the second closed edge penetrating through the sub-connecting node and the median line of the folded hexagonal structure monomer is e2, and the thickness of the planar semi-circumferential compliant interface structure is hbThe thickness of the honeycomb layered monomer is h, and the thickness of the folded hexagonal layered monomer is h'; h isb＝0.5h＝0.5h’＝e1+e2。
In a preferred embodiment of the present invention, e1 is (0.5 to 2) × e 2.
As a preferable technical solution of the present invention, the planar semi-circumferential interface structure further includes a first bottom connecting edge L3 penetrating the bottom edge of the remaining small half of the honeycomb unit and a second bottom connecting edge L4 penetrating the bottom edge of the remaining small half of the folded hexagonal unit.
As the preferred technical scheme of the invention, the honeycomb structural area and the inflected hexagonal negative Poisson ratio structural area are respectively provided with at least 1; the honeycomb structure area is provided with at least 2 layers of honeycomb layered monomers, and the folded-in hexagonal negative Poisson ratio structure area is provided with at least 2 layers of folded-in hexagonal layered monomers; each layer of honeycomb layered monomer has at least 3 honeycomb monomers, and each layer of folded hexagonal layered monomer has at least 3 folded hexagonal structural monomers.
As the preferable technical scheme of the invention, the composite energy-absorbing structure is a three-dimensional structure obtained by stretching a two-dimensional plane.
As a preferable technical scheme of the invention, after the composite energy-absorbing structure is stretched in three dimensions, a plurality of closed pipeline structures can be formed. These pipe structures can be used for filling liquids (for transporting cooling liquids or storing explosion-proof liquids, etc.), burying electrical components, etc. For example, the filling liquid can be acted by the hydraulic pressure of the liquid, and when the explosion-proof liquid is filled, the explosion-proof liquid can be discharged into the space outside the structure to play the explosion suppression role after the structure is damaged.
As the preferred technical scheme of the invention, the periphery of the composite energy absorption structure is also sleeved with a frame.
Compared with the prior art, the invention has the following beneficial effects:
the whole stress-strain curve of the negative Poisson ratio structure is divided into four areas, namely an elastic area, a platform stress enhancement area and a densification area. When the honeycomb structure is subjected to external pressure, the honeycomb structure firstly generates yield deformation, the negative Poisson ratio structure also generates yield deformation along with the increase of force, compared with a common honeycomb structure, the composite energy absorption structure has the problem that the platform stress is enhanced after a platform area on a structural stress strain curve due to the existence of the negative Poisson ratio effect, the occupied ratio of the composite energy absorption structure in the area surrounded by stress strain is larger at this stage, and therefore the stage has a non-negligible effect on the whole energy absorption capacity of the structure. Secondly, the honeycomb structure area is relatively flexible and bears the function of large deformation energy absorption; and the inflected hexagonal negative Poisson ratio structural region has stronger structural rigidity due to larger deformation-resistant internal force and bears a relatively rigid impact-resistant function. The two structures are combined together, so that the rigidity and the flexibility of the energy absorption structure are combined, and the buffering efficiency is realized more efficiently.
The present invention adds closed edges, i.e., a first closed edge L1 at a distance e1 from the median line e of the single layer in the honeycomb single-layer structure and a closed edge L2 at a distance e2 from the median line e of the single layer in the negative poisson ratio single-layer structure, to the connection nodes (free ends) formed on the remaining small half portions after removing most of the honeycomb single-body and the folded-in hexagonal single-body, and the first bottom edge connecting edge L3 and the second bottom edge connecting edge L4 are optional straight edges collinear with the remaining bottom edges of the single-layer structure. Four planar half-cycle sequential interface half-layer structures of the present invention can be obtained, and in order to ensure the butt joint of the half-layer structures, the dimensions d1 ═ d1 ', d2 ═ d 2' are required, preferably, in order to ensure the continuity of the connected structures, the 2 monomer dimensions b ═ b 'and the included angle α ═ α' (α ═ α 'can also be replaced by the layer thickness h ═ h'); the side sections of d1 and d1 'and d2 and d 2' of the interface half-layer structure are overlapped respectively, so that a planar half-cycle sequential interface structure can be formed. In this case, the interface layer thickness h is preferably such that the structures are continuously connected to one anotherb0.5 h-0.5 h' -e 1+ e2, preferably e1 is (0.5-2) × e 2. The interface structure formed by the method has small interface layer thickness; if only the first closed edge L1 and the second closed edge L2 are provided, the interface area of the interface structure part can be incomplete negative Poisson's ratio structure and honeycomb structureThe two regions are alternately arranged because of the influence of the interface layer, and some characteristics appear in the actual energy absorption process; if the first bottom connecting edge L3 and the second bottom connecting edge L4 are added, the alternating action disappears, and the interface becomes completely isolated and strengthened.
Drawings
FIG. 1 is a schematic view of a honeycomb monolith structure;
FIG. 2 is a schematic view of a honeycomb layered monolith;
FIG. 3 is a composite schematic diagram of two adjacent layers of honeycomb laminated monomers;
FIG. 4 is a schematic structural view of a folded-in hexagonal monomer;
FIG. 5 is a schematic view of a folded-in hexagonal layered monomer;
FIG. 6 is a composite schematic view of two adjacent folded hexagonal layered monomers;
FIG. 7 is a composite schematic overall view of the composite energy absorbing structure of the present invention;
FIG. 8 is a schematic view of a planar half-perimeter compliant interface structure according to the present invention (shown in cross-hatched area);
FIGS. 9(a) and 9(b) are schematic diagrams of the conversion of honeycomb layered monomers and folded hexagonal layered monomers to planar half-perimeter cis-junction interface structures, respectively;
FIGS. 10(a) and 10(b) are schematic illustrations of the formation of two different forms of planar semi-circumferential interface structures;
FIG. 11 is a schematic cross-sectional view of a square composite energy absorbing structure of example 1;
FIG. 12 is a schematic cross-sectional view of a square composite energy absorbing structure of example 2.
In the figure, 1 is a honeycomb structure area, 11 is a honeycomb layered single body, 111 is a honeycomb single body, 112 is a honeycomb connecting wall, 2 is an inflected hexagonal negative poisson ratio structure area, 21 is an inflected hexagonal layered single body, 211 is an inflected hexagonal single body, 222 is a negative poisson ratio connecting wall, 3 is a planar small half-circumference interface structure, 31 is a connecting node, 32 is a first closed edge, 33 is a second closed edge, 34 is a first bottom edge connecting edge, 35 is a second bottom edge connecting edge, and 4 is a frame.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
A negative Poisson ratio-honeycomb type composite energy absorption structure with a planar semi-circumferential cis-junction interface is provided with a honeycomb structure area 1 and an inflected hexagonal negative Poisson ratio structure area 2 which are positioned on the same plane and are alternately arranged, and the honeycomb structure area 1 and the inflected hexagonal negative Poisson ratio structure area 2 are in composite connection through a planar semi-circumferential cis-junction interface structure 3. The composite energy absorption structure is a laminated composite structure of an inflected hexagonal negative Poisson ratio structure and a honeycomb structure, is a three-dimensional structure obtained after a two-dimensional plane is stretched, and mainly comprises four characteristics: the composite structure comprises a honeycomb structural area 1, an inflected hexagonal negative Poisson ratio structural area 2, a negative Poisson ratio-honeycomb composite structure interface area and a composite mode. The structure can realize the 'hardness and softness' of the energy-absorbing structure, and the buffering efficiency is realized more efficiently.
The honeycomb structural area 1 is composed of a plurality of layers of honeycomb layered single bodies 11 on the same plane, each layer of honeycomb layered single body 11 (transverse layered single body) is composed of a plurality of honeycomb single bodies 111 arranged in sequence and a honeycomb connecting wall 112 connected at a middle line between two adjacent honeycomb single bodies 111 and arranged in a shape of a Chinese character 'yi', and the two adjacent layers of honeycomb layered single bodies 11 are connected in a mode that the bottom edges of the honeycomb single bodies 111 coincide with the bottom edges. The key structure size of the honeycomb type monomer is shown in figure 1, and the honeycomb type monomer is composed of 2 bottom edges with the length of a and 4 side walls with the length of b, the length of a diagonal line parallel to the bottom edges is c, the included angle between two adjacent side walls is alpha, the line width/wall thickness is t, and a, b and c refer to the median length of the wall thickness. Whereas the honeycomb layered single bodies 11 (single-layer structure) are the transverse layered single bodies shown in fig. 2, the preferred minimum single-layer array of the honeycomb layered single bodies 11 should have at least 3 hexagons (honeycomb single bodies 111) as shown in fig. 2. The honeycomb connecting wall 112 (intermediate connecting line) has a length a equal to the length of the bottom side. And the combination mode of two adjacent layers of honeycomb structures is shown in figure 3, namely the bottom edge and the bottom edge are completely coincident. Thereby allowing for stacking of numerous layers of honeycomb.
The inflected hexagonal negative poisson ratio structural region 2 is composed of a plurality of inflected hexagonal single bodies 21 on the same plane, each inflected hexagonal single body 21 is composed of a plurality of inflected hexagonal single bodies 211 which are sequentially arranged and a negative poisson ratio connecting wall 212 which is connected at a middle line between two adjacent inflected hexagonal single bodies 211 and is arranged in a shape like a Chinese character 'yi', and the inflected hexagonal single bodies 21 are connected in a mode that the bottom edges and the bottom edges of the inflected hexagonal single bodies 211 coincide. The size of the inflected hexagonal structural unit 211 is shown in fig. 4, and is composed of 2 bottom sides with length c 'and 4 side walls with length b', a diagonal length parallel to the bottom side is a ', an included angle between two adjacent side walls is alpha', a line width/wall thickness is t ', and a', b 'and c' refer to the median length of the wall thickness. Whereas the inflected hexagonal layered single bodies 21 (single layer structure) are the transverse layered single bodies as shown in fig. 5, the preferred minimum single layer array of the inflected hexagonal layered single bodies 21 should have at least 3 inflected hexagonal structural single bodies 211 as shown in fig. 5. The length of the middle connecting line is c' which is equal to the length of the bottom side. The compounding manner of the folded hexagonal layered single bodies 21 in the two adjacent layers is shown in fig. 6, namely, the bottom edge and the bottom edge are completely overlapped. Therefore, innumerable layer folded hexagonal negative Poisson's ratio structures can be folded.
As shown in fig. 7, the honeycomb single bodies 111 of the honeycomb structural region 1 are arranged in one-to-one correspondence with the inflected hexagonal structural single bodies 211 of the inflected hexagonal negative poisson's ratio structural region 2 (i.e., one honeycomb single body corresponds to one inflected hexagonal structural single body). In this composite structure, the two monomers have the preferred dimensional parameter relationships a ═ a ', c ═ c ' and t ═ t '. At least 1 layer of honeycomb structure area 1 and folded-in hexagonal negative Poisson ratio structure area 2 are provided, and at least two layers of corresponding layered monomers are required to be arranged inside the honeycomb structure area 1 and the folded-in hexagonal negative Poisson ratio structure area 2 to exert respective effects. A negative Poisson ratio-honeycomb composite structure interface region is clamped between two layers of monomers.
As shown in fig. 9(a), the honeycomb layered monomer 11 of the honeycomb structural region 1 adjacent to the inflected hexagonal negative poisson's ratio structural region 2 is removed from the direction parallel to the median line, the honeycomb connecting wall 112 and most of the honeycomb monomer 111 near the inflected hexagonal negative poisson's ratio structural region 2 side. As shown in fig. 9(b), the folded-in hexagonal layered monomers 211 of the folded-in hexagonal negative poisson's ratio structural region 2 adjacent to the honeycomb structural region 1 are removed from the negative poisson's ratio connecting walls 212 and most of the folded-in hexagonal structural monomers 211 near the side of the honeycomb structural region 1 from the direction parallel to the median line; the rest small half part of the honeycomb single body 111 and the rest small half part of the folded hexagonal structure single body 211 are both provided with two connecting nodes 31;
the planar semi-circumferential compliant interface structure 3 is formed by adding a first through closed edge 32(L1) to the connecting node 21 of the remaining small half of the honeycomb single body 111, adding a second through closed edge 33(L2) to the connecting node 31 of the remaining small half of the folded hexagonal single body 211, and butting and connecting the two connecting nodes 31 of the remaining small half of the folded hexagonal single body 211 and the two connecting nodes 31 of the remaining small half of the honeycomb single body 111. As shown in fig. 10 and 8.
Preferably, the planar semi-perimeter compliant interface structure 3 further comprises a first bottom connecting edge 34(L3) disposed through the bottom edge of the remaining small half of the honeycomb unit 111 and a second bottom connecting edge 35(L4) disposed through the bottom edge of the remaining small half of the folded-in hexagonal unit 211.
In the invention, the distance between adjacent connecting nodes 31 on the remaining small half part of two adjacent honeycomb single bodies 111 is d1, and the distance between two connecting nodes 31 on the remaining small half part of each honeycomb single body 111 is d 2; the distance between adjacent connecting nodes 31 on the remaining small half of two adjacent inflected hexagonal structural units 211 is d1 ', and the distance between two connecting nodes 31 on the remaining small half of each inflected hexagonal structural unit 211 is d 2'. The distance between the first closed edge 32(L1) penetrating through the connecting node 31 of the remaining small half part of the honeycomb single body 111 and the median line of the honeycomb single body 111 is e1, the distance between the second closed edge 33(L2) penetrating through the connecting node 31 of the remaining small half part of the folded-in hexagonal single body 211 and the median line of the folded-in hexagonal single body 211 is e2, and the thickness of the planar half-circumference compliant interface structure 3 is hbThickness of the honeycomb layered unit 11H, the thickness of the folded hexagonal layered monomer 21 is h'.
By adding a closed edge (shown by a thick solid line in fig. 9) to the connection node (free end) formed on the remaining small half portion after most of the honeycomb layered unit and the folded-in hexagonal layered unit are removed (the removed portion is shown by a dotted line in fig. 9), i.e., the first closed edge L1 from the middle position line e1 of the single layer in the honeycomb single-layer structure and the closed edge L2 from the middle position line e2 of the single layer in the negative poisson's ratio single-layer structure, the first bottom connecting edge L3 and the second bottom connecting edge L4 are optional straight edges that are collinear with the remaining bottom edge of the single-layer structure. Four planar half-cycle sequential interface half-layer structures of the present invention can be obtained, and in order to ensure the butt joint of the half-layer structures, the dimensions d1 ═ d1 ', d2 ═ d 2' are required, preferably, in order to ensure the continuity of the connected structures, the 2 monomer dimensions b ═ b 'and the included angle α ═ α' (α ═ α 'can also be replaced by the layer thickness h ═ h'); as shown in FIG. 10, the "planar semi-circumferential interface structure" can be formed by overlapping the side segments of d1 and d1 ', d2 and d 2' of the interface semi-layer structure. In this case, the interface layer thickness h is preferably such that the structures are continuously connected to one anotherb0.5 h-0.5 h' -e 1+ e2, preferably e1 is (0.5-2) × e 2. The interface structure formed by the method has small interface layer thickness; if only the first closed edge L1 and the second closed edge L2 (corresponding to the situation without chain lines in fig. 8) are provided, the interface region of the interface structure part is an incomplete negative poisson's ratio structure and is in mutual opposite action with the honeycomb structure, and the two interface regions are separated from each other due to the influence of the interface layer, and the two regions appear alternately, so that some characteristics appear in the actual energy absorption process; if the first bottom connecting edge L3 and the second bottom connecting edge L4 are added (corresponding to the case of the chain line in FIG. 8), the alternating action disappears, and the interface becomes completely isolated and reinforced.
Preferably, after the composite energy-absorbing structure is stretched in three dimensions, a plurality of closed pipeline structures can be formed. These pipe structures can be used for filling liquids (for transporting cooling liquids or storing explosion-proof liquids, etc.), burying electrical components, etc. For example, the filling liquid can be acted by the hydraulic pressure of the liquid, and when the explosion-proof liquid is filled, the explosion-proof liquid can be discharged into the space outside the structure to play the explosion suppression role after the structure is damaged.
Example 1
Fig. 11 shows a section of a square composite energy absorbing structure of 53.125mm × 50mm (comprising a 50mm inner layer and a 3.125mm interface layer), with the thickness h ═ 6.25mm, a ═ 3.49mm, b ═ 3.46mm, c ═ 6.32mm, h ═ 6.25mm, of the two monolayers (honeycomb lamellar elements 11 and inflected hexagonal lamellar elements 21) and the interface layer (planar semi-circumferential coterminous interface structure)bH/2, e1 e2 h/4, t is about 0.6 mm. The compounding mode is 1 group of honeycomb type and 1 group of folded hexagonal negative Poisson ratio structures, each group comprises 4 layers of monomer structures (negative Poisson ratio-N4; honeycomb-C4, and N4C4), each layer comprises 5 monomer structures, and the interface state is a planar semi-circumference direct connection interface structure interface type (no L3 and L4 side). The energy absorbing structure can obviously show deformation difference and shows better stress state to resist impact with light weight. In order to match the external square shape, a frame 4 is additionally arranged on the periphery of the frame, and the thickness of the frame 4 is 0.6 mm.
Example 2
Fig. 12 shows a cross-section of a 59.375mm x 50mm square composite energy absorbing structure (comprising a 50mm inner layer and a 3 x 3.125mm interface layer), with the thickness h ═ 6.25mm, a ═ 3.49mm, b ═ 3.46mm, c ═ 6.32mm, and h ═ of the two individual layers and the interface layer, respectivelybH/2, e1 e2 h/4, t is about 0.6 mm. The compound mode is 2 groups of honeycomb type and 2 groups of internal folding hexagonal negative Poisson ratio structures, each group comprises 2 layers of monomer structures (negative Poisson ratio-N2; honeycomb type-C2, combined N2C2), each layer comprises 5 monomer structures, and the interface state is a planar semi-circumference direct connection interface structure. The energy absorption structure can obviously show multi-level deformation difference, and shows better stress state and light impact resistance. In order to match the external square shape, a frame 4 is additionally arranged on the periphery of the frame, and the thickness of the frame 4 is 0.6 mm.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A negative Poisson ratio-honeycomb type composite energy absorption structure with a planar semi-circumferential cis-junction interface is characterized by comprising a honeycomb structure area and an inflected hexagonal negative Poisson ratio structure area which are positioned on the same plane and are alternately arranged, wherein the honeycomb structure area and the inflected hexagonal negative Poisson ratio structure area are in composite connection through a planar semi-circumferential cis-junction interface structure;
the honeycomb structure area consists of a plurality of layers of honeycomb layered monomers on the same plane, each layer of honeycomb layered monomer consists of a plurality of honeycomb monomers which are sequentially arranged and a honeycomb connecting wall which is connected at the position of a median line between two adjacent honeycomb monomers and is arranged in a shape like a Chinese character 'yi', and the two adjacent layers of honeycomb layered monomers are connected in a way that the bottom edges of the honeycomb monomers are superposed;
the inward-folded hexagonal negative Poisson ratio structural region consists of a plurality of inward-folded hexagonal layered monomers positioned on the same plane, each inward-folded hexagonal layered monomer consists of a plurality of inward-folded hexagonal structural monomers which are sequentially arranged and a negative Poisson ratio connecting wall which is connected at the middle line position between two adjacent inward-folded hexagonal structural monomers and is arranged in a shape like a Chinese character 'yi', and the two adjacent inward-folded hexagonal layered monomers are connected in a mode that the bottom edges of the inward-folded hexagonal structural monomers are superposed;
the honeycomb monomers in the honeycomb structure area and the inflected hexagonal structure monomers in the inflected hexagonal negative poisson ratio structure area are correspondingly arranged one by one;
removing the honeycomb connecting wall and most of honeycomb monomers close to one side of the inflected hexagonal negative Poisson ratio structural region from the direction parallel to the median line of the honeycomb layered monomers of the honeycomb structural region close to the inflected hexagonal negative Poisson ratio structural region; removing the negative Poisson ratio connecting wall and most of the inflected hexagonal structure monomers close to one side of the honeycomb structure region from the direction parallel to the median line of the inflected hexagonal layered monomers of the inflected hexagonal negative Poisson ratio structure region close to the honeycomb structure region; the rest small half part of the honeycomb monomer and the rest small half part of the folded hexagonal structure monomer are both provided with two connecting nodes;
a first penetrating closed edge is added to a connecting node of the remaining small half part of the honeycomb single body, a second penetrating closed edge is added to a connecting node of the remaining small half part of the folded hexagonal structure single body, and the two connecting nodes of the remaining small half part of the folded hexagonal structure single body are in butt joint connection with the two connecting nodes of the remaining small half part of the honeycomb single body to form a planar semi-circumferential sequential interface structure.
2. The negative Poisson ratio-honeycomb composite energy-absorbing structure with a planar semi-circumferential interface of claim 1, wherein the distance between adjacent connection nodes on the remaining small half of two adjacent honeycomb cells is d1, and the distance between two connection nodes on the remaining small half of each honeycomb cell is d 2; the distance between adjacent connecting nodes on the remaining small half parts of the two adjacent inflected hexagonal structural single bodies is d1 ', and the distance between two connecting nodes on the remaining small half parts of each inflected hexagonal structural single body is d 2';
d1 ═ d1 'and d2 ═ d 2'.
3. The negative Poisson's ratio-honeycomb type composite energy absorbing structure with the planar semi-circumferential interface according to claim 1 or 2, wherein the honeycomb single body is composed of 2 bottom edges with a length a and 4 side walls with a length b, the length of a diagonal line parallel to the bottom edges is c, the included angle between two adjacent side walls is alpha, and the wall thickness is t; the length of the honeycomb connecting wall is a and is equal to the length of the bottom edge;
the inflected hexagonal structural monomer consists of 2 bottom edges with the length of c 'and 4 side walls with the length of b', the length of a diagonal line parallel to the bottom edges is a ', and the wall thickness is t'; the length of the connecting wall with the negative Poisson ratio is c' and is equal to the length of the bottom edge;
a＝a’，c＝c’，t＝t’。
4. the negative poisson's ratio-honeycomb composite energy absorbing structure with planar semi-circumferential interface as claimed in claim 3, wherein a, c, t, b, α', a.
5. The negative Poisson's ratio-honeycomb composite energy-absorbing structure with planar half-perimeter compliant interface of claim 4, wherein the distance between the first closed edge of the connection node of the remaining small half of the honeycomb unit and the median line of the honeycomb unit is e1, the distance between the second closed edge of the connection node of the remaining small half of the folded-in hexagonal unit and the median line of the folded-in hexagonal unit is e2, and the thickness of the planar half-perimeter compliant interface structure is hbThe thickness of the honeycomb layered monomer is h, and the thickness of the folded hexagonal layered monomer is h'; h isb＝0.5h＝0.5h’＝e1+e2。
6. The negative Poisson's ratio-honeycomb composite energy absorbing structure with planar semi-circumferential interface of claim 5, wherein e1 ═ e2 (0.5-2).
7. The negative poisson's ratio-honeycomb composite energy-absorbing structure with a planar semi-circumferential interface as claimed in claim 1, wherein the planar semi-circumferential interface structure further comprises a first bottom connecting edge disposed through the bottom edge of the remaining small half of the honeycomb monolith and a second bottom connecting edge disposed through the bottom edge of the remaining small half of the folded-in hexagonal monolith.
8. The negative poisson's ratio-honeycomb composite energy-absorbing structure with a planar semi-circumferential interface of claim 1, wherein there are at least 1 of the honeycomb structural region and the inflected hexagonal negative poisson's ratio structural region, respectively; the honeycomb structure area is provided with at least 2 layers of honeycomb layered monomers, and the folded-in hexagonal negative Poisson ratio structure area is provided with at least 2 layers of folded-in hexagonal layered monomers; each layer of honeycomb layered monomer has at least 3 honeycomb monomers, and each layer of folded hexagonal layered monomer has at least 3 folded hexagonal structural monomers.
9. The negative poisson's ratio-honeycomb type composite energy-absorbing structure with a planar semi-circumferential interface as claimed in claim 1, wherein the composite energy-absorbing structure is a three-dimensional structure obtained by stretching a two-dimensional plane.
10. The negative poisson's ratio-honeycomb composite energy-absorbing structure with a planar semi-circumferential interface of claim 9, wherein the composite energy-absorbing structure is capable of forming a plurality of closed conduit structures after being stretched in three dimensions.
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