CN112922993B - Composite energy absorption structure combining negative Poisson ratio structure and combined honeycomb structure - Google Patents
Composite energy absorption structure combining negative Poisson ratio structure and combined honeycomb structure Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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Abstract
The invention relates to a composite energy absorption structure combining a negative Poisson ratio structure and a combined honeycomb structure, wherein an inflected hexagonal negative Poisson ratio structure area and a honeycomb structure area are alternately stacked, the joint of the inflected hexagonal negative Poisson ratio structure area and the honeycomb structure area is a composite structure interface area, the composite structure interface area is connected in a mode that semi-circumference monomer structures are staggered, and reinforcing edges in the semi-circumference monomer structures in the inflected hexagonal negative Poisson ratio structure area and reinforcing edges in the semi-circumference monomer structures in the honeycomb structure composition area are combined into two continuous reinforcing edges which are arranged in parallel. Compared with the prior art, the energy-absorbing structure has the advantages that the two structures are compounded together, so that the stiffness and softness of the energy-absorbing structure are combined, and the buffering efficiency is realized more efficiently. Meanwhile, the plane half-cycle interface structure can enhance the rigidity of the interface, isolate the mutual influence among large and small deformations, and has great significance for the application of multi-section unequal deformations.
Description
Technical Field
The invention relates to the technical field of energy-absorbing materials, in particular to a composite energy-absorbing structure combining a negative Poisson's ratio structure and a combined honeycomb structure.
Background
The honeycomb structure material is a typical porous composite structure and is a typical energy-absorbing material, and the strength-weight ratio and the rigidity-weight ratio of the honeycomb structure material are superior to those of the existing materials. 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. Meanwhile, the preparation process of the honeycomb material gradually becomes mature, the manufacturing cost is greatly reduced, and the superiority of the honeycomb material is continuously reflected in various industries. Usually, the honeycomb material has a positive poisson ratio in a macroscopic view, the positive poisson ratio material transversely shrinks when being subjected to uniaxial stretching, the poisson ratio is a positive value, the mechanical property of the material is weak, and the indentation resistance effect and the impact resistance are weak.
On the basis, materials with special structures of negative poisson ratio effect appear, and some negative poisson ratio composite materials are also generated, however, how to realize a composite energy absorption structure with better performance is the direction of continuous research of related people in the field.
Disclosure of Invention
The invention aims to provide a composite energy absorption structure combining a negative Poisson ratio structure and a combined honeycomb structure so as to better improve the performance of the negative Poisson ratio structure or the honeycomb structure.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a composite energy absorption structure combining a negative Poisson ratio structure and a combined honeycomb structure, which comprises an inflected hexagonal negative Poisson ratio structure area and a honeycomb structure area,
the inner-folded hexagonal negative Poisson ratio structure region is formed by laminating a plurality of transverse layered monomer layers, each transverse layered monomer layer is formed by connecting a plurality of inner-folded hexagonal monomers at intervals, the transverse layered monomer layers of two adjacent layers are laminated in a way that the bottom edges are completely overlapped with the bottom edges, namely after the transverse laminated monomer layers of two adjacent layers are laminated, a new transverse laminated monomer layer is formed between the transverse laminated monomer layers of two adjacent layers, the new transverse layered monomer layer formed between the transverse layered monomer layers of two adjacent layers is used as the bottom edge of the new transverse layered monomer layer between the folded hexagonal monomers in the upper layer and the lower layer, the side walls of the inward-folded hexagonal monomers in the upper layer and the lower layer are taken as the side walls of the inward-folded hexagonal monomers, and the bottom edges, which are attached to the inward-folded hexagonal monomers in the upper layer and the lower layer, are taken as connecting lines among the inward-folded hexagonal monomers in the newly formed transverse layered monomer layer; the transverse layered monomer layers of two adjacent layers are laminated in a mode that the bottom edge is completely overlapped with the bottom edge, namely after the transverse layered monomer layers of two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of two adjacent layers. By adopting the multilayer transverse layered monomer layer laminated structure, countless layer-folded hexagonal negative Poisson ratio structural regions can be stacked according to requirements.
The honeycomb structure area is formed by laminating a plurality of transverse layered monomer layers, the transverse layered monomer layer of each layer is formed by connecting a plurality of honeycomb type monomers at intervals, the honeycomb type monomer is of a hexagonal structure, the bottom edges of the transverse layered monomer layers of two adjacent layers are completely overlapped in a stacking mode, namely, after the transverse layered monomer layers of two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of two adjacent layers, the new transverse layered monomer layer formed between the transverse layered monomer layers of two adjacent layers is used as the bottom edge of the new transverse layered monomer layer between the honeycomb type monomer layers of the upper layer and the honeycomb type monomer layer of the lower layer, the side walls of the honeycomb type monomers in the upper layer and the lower layer are taken as the side walls of the honeycomb type monomers, and the bottom edges, which are attached to the honeycomb type monomers in the upper layer and the lower layer, are taken as connecting lines between the honeycomb type monomers in the newly formed transverse layered monomer layer; the transverse layered monomer layers of two adjacent layers are laminated in a mode that the bottom edge is completely overlapped with the bottom edge, namely after the transverse layered monomer layers of two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of two adjacent layers. By adopting the multilayer transverse laminated monomer layer laminated structure, a plurality of layers of honeycomb structures can be laminated according to the requirement.
The inflected hexagonal negative poisson ratio structural regions and the honeycomb structural regions are alternately stacked, the joint of the inflected hexagonal negative poisson ratio structural regions and the honeycomb structural regions is a composite structure interface region,
in the composite structure interface region, the transverse layered monomer layer in the inflected hexagonal negative Poisson ratio structure region is of a half-cycle monomer structure, the transverse layered monomer layer in the honeycomb structure region is also of a half-cycle monomer structure,
the half-circumference monomer structure in the inflected hexagonal negative Poisson ratio structure area means that half of an inflected hexagonal monomer is cut off, a reinforcing edge is added on the remaining half of the inflected hexagonal monomer, the reinforcing edge is connected between the bottom edges of two adjacent inflected hexagonal monomers on the same layer and between two side walls of the inflected hexagonal monomer,
the half-circumference single body structure in the honeycomb type structure area means that half of the honeycomb type single body is cut off, a reinforcing edge is added on the left half of the honeycomb type single body, the reinforcing edge is connected between the bottom edges of two adjacent honeycomb type single bodies on the same layer and is connected on the diagonal line of the honeycomb type single body parallel to the bottom edges,
in the composite structure interface area, the reinforcing edges in the half-circumference monomer structure in the inward-folded hexagonal negative Poisson ratio structure area and the reinforcing edges in the half-circumference monomer structure in the honeycomb structure area are arranged in a staggered mode, and the reinforcing edges in the half-circumference monomer structure in the inward-folded hexagonal negative Poisson ratio structure area and the reinforcing edges in the half-circumference monomer structure in the honeycomb structure composition area are combined into two continuous reinforcing edges which are arranged in parallel.
The composite energy absorbing structure mainly comprises 4 big features: the composite structure comprises a honeycomb structural area, an inflected hexagonal negative Poisson ratio structural area, a negative Poisson ratio-honeycomb composite structure interface area and a composite mode.
In the composite energy absorption structure, the honeycomb structure area is relatively flexible and bears the large deformation energy absorption function; 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. Therefore, the composite energy-absorbing structure can realize the 'stiffness and softness' of the energy-absorbing structure, and the buffering effect is realized more efficiently.
In an embodiment of the present invention, in the composite structure interface region, if the folded-in hexagonal negative poisson ratio structure region is above and the honeycomb structure region is below, the half-circumference monomer structure in the folded-in hexagonal negative poisson ratio structure region means that the lower half part of the folded-in hexagonal monomer is cut off, and the half-circumference monomer structure in the honeycomb structure region means that the upper half part of the honeycomb monomer is cut off; if the inflected hexagonal negative poisson ratio structure area is located at the lower part and the honeycomb structure area is located at the upper part, the half-circumference monomer structure in the inflected hexagonal negative poisson ratio structure area means that the upper half part of an inflected hexagonal monomer is cut off, and the half-circumference monomer structure in the honeycomb structure area means that the lower half part of the honeycomb monomer is cut off.
In one embodiment of the present invention, the position of the cut-away refers to along the central axis of the upper and lower structures of the folded-in hexagonal single body or honeycomb type single body.
The inward-folded hexagonal monomer is composed 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 ', the included angle of two adjacent side walls is alpha ', the length of a connecting line between two adjacent inward-folded hexagonal monomers in the transverse layered monomer layer is a ', the length of the connecting line is equal to the length of the bottom edges, and the wall thickness (if printing and forming, also called as the line width) of the honeycomb type monomer is t;
in one embodiment of the invention, 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 length of a connecting line between two adjacent honeycomb type monomers in the transverse layered monomer layer is a, the length of the connecting line is equal to the length of the bottom edges, and the wall thickness of the inward folded hexagonal monomer is t';
in the composite structure interface area, the dimensional parameter relationship between the honeycomb type monomer and the folded hexagon monomer is as follows: a, c, and t are a ', c, and t'.
In one embodiment of the present invention, in the honeycomb-type monomer, a, b, and c refer to wall thickness median lengths; where a, b, c refer to the median length of the wall thickness. In particular, the distance from one edge center line to the other edge center line is a periodic overlap, and since the shape has a wall thickness, which is the surface for subtracting the wall thickness problem, a, b, c are not direct outer frame distances, but rather median lengths of the wall thicknesses, otherwise 1 wall thickness is less. In the inflected hexagonal monomer, a ', b ' and c ' refer to the median length of the wall thickness. In particular, the distance from the center line of one end edge to the center line of the other end edge is a periodic superposition, and since the shape has a wall thickness, which is the surface for subtracting the wall thickness problem, a ', b ', c ' are not direct outer frame distances, but rather the median length of the wall thickness, otherwise 1 wall thickness is less.
In one embodiment of the invention, in the composite structure interface region,
the connection mode of the half-cycle monomer structure in the inflected hexagonal negative Poisson ratio structure region and the half-cycle monomer structure in the honeycomb structure region is as follows: the reinforcing edge connected between the two side walls of the folded hexagonal single body is superposed with the connecting line on the central axis of the two adjacent honeycomb type single bodies.
In one embodiment of the invention, in the interface region of the composite structure, the thickness of the reinforcing edge is equal to that of the honeycomb-type single body or that of the folded-in hexagonal single body. It can be seen that when a ═ a 'and c ═ c', the obtained half-cycle monomer structures are equivalent, and the number and length of the edges removed and added are also equivalent, so that the operation method is practically the same in material, but the interface structure can enhance the rigidity at the interface, isolate the mutual influence between large and small deformations, and has great significance for the application of multistage unequal deformations.
In an embodiment of the present invention, when the inflected hexagonal negative poisson's ratio structural regions and the honeycomb structural regions are alternately arranged, at least 1 inflected hexagonal negative poisson's ratio structural region and at least two transverse layered monomer layers are arranged in the inflected hexagonal negative poisson's ratio structural region, and at least two transverse layered monomer layers are arranged in the honeycomb structural region, so as to exert respective effects.
In one embodiment of the invention, at least 3 hexagonal monomers are folded in the transverse layered monomer layer of the hexagonal negative poisson's ratio structural region, and at least 3 honeycomb monomers are folded in the transverse layered monomer layer of the honeycomb structural region.
The composite energy absorbing structure of the present invention is described based on the cross-sectional shape of the composite energy absorbing structure.
The composite energy absorbing structure, after being stretched in three dimensions, can form a plurality of closed pipe structures which can be used for filling liquid (such as for conveying cooling liquid or storing explosion-proof liquid and the like), burying electric components and the like. 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.
In the invention, the whole stress-strain curve of the negative Poisson ratio structure is divided into four regions, namely an elastic region, a platform stress enhancement region and a densification region.
In the invention, the composite energy absorption structure combining the negative Poisson ratio structure and the combined honeycomb structure can be prepared in a 3D printing mode.
Compared with the prior art, when the composite energy absorption structure is subjected to external pressure, the honeycomb structure area firstly generates yield deformation, the folded hexagonal negative Poisson ratio structure area also generates yield deformation along with the increase of force, compared with a common honeycomb structure, the composite energy absorption structure has the advantages that the platform stress is enhanced after a platform area on a structure stress strain curve due to the existence of the negative Poisson ratio effect, the occupied ratio 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.
Meanwhile, the plane half-cycle interface structure can enhance the rigidity of the interface, isolate the mutual influence among large and small deformations, and has great significance for the application of multi-section unequal deformations.
Drawings
FIG. 1 is a dimension chart of a honeycomb-type single body structure;
FIG. 2 is a graph of the dimensions of a transverse laminar monomer layer structure in a honeycomb region;
FIG. 3 is a schematic view of a multilayer transverse laminar monomer layer stacking in a honeycomb-type structure region;
FIG. 4 is a drawing of the dimensions of a folded-in hexagonal monolithic structure;
FIG. 5 is a graph of the structure dimensions of transverse laminar monomer layers in an inflected hexagonal negative Poisson's ratio structure region;
FIG. 6 is a schematic diagram showing a stacking manner of a plurality of transverse layered monomer layers in an inflected hexagonal negative Poisson ratio structural region;
FIG. 7 is a schematic structural view of a layered composite mode of an inflected hexagonal negative Poisson ratio structural region and a honeycomb structural region;
FIG. 8 is a schematic view of the structure of the "phase-embedded small half-cycle" interface;
FIG. 9 is a schematic diagram of the transformation process for a "planar half-cycle" interface structure;
FIG. 10 is a schematic diagram of a method of forming a "planar half-perimeter" interface structure;
FIG. 11 is a schematic cross-sectional view of type 56.25mm by 50mm N4C4-B2 in example 1;
FIG. 12 is a schematic cross-sectional view of N2C2-B2 type 68.75mm X50 mm in example 2.
Detailed Description
The invention provides a composite energy absorption structure combining a negative Poisson ratio structure and a combined honeycomb structure, which comprises an inflected hexagonal negative Poisson ratio structure area and a honeycomb structure area, wherein the inflected hexagonal negative Poisson ratio structure area and the honeycomb structure area are laminated and compounded to form a three-dimensional structure.
The composite energy absorbing structure mainly comprises 4 big features: the composite structure comprises a honeycomb structural area, an inflected hexagonal negative Poisson ratio structural area, a negative Poisson ratio-honeycomb composite structure interface area and a composite mode.
In the composite energy absorption structure, the honeycomb structure area is relatively flexible and bears the large deformation energy absorption function; 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. Therefore, the composite energy-absorbing structure can realize the 'stiffness and softness' of the energy-absorbing structure, and the buffering effect is realized more efficiently.
Referring to fig. 1-3, the honeycomb type single body structure is shown in fig. 1, the transverse layered single body layer structure in the honeycomb type structure area is shown in fig. 2, and the multilayer transverse layered single body layer stacking mode in the honeycomb type structure area is shown in fig. 3. In one embodiment, the honeycomb-type structure area is formed by stacking a plurality of transverse layered monomer layers, wherein each transverse layered monomer layer is formed by connecting a plurality of honeycomb-type monomers at intervals, the honeycomb-type monomers are in a hexagonal structure and are 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, and the length of a connecting line between two adjacent honeycomb-type monomers in each transverse layered monomer layer is a and is equal to the length of the bottom edges; the transverse layered monomer layers of two adjacent layers are laminated in a mode that the bottom edge is completely overlapped with the bottom edge, namely after the transverse layered monomer layers of two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of two adjacent layers. The new transverse layered monomer layer formed between the adjacent two transverse layered monomer layers takes the connecting line between the upper honeycomb type monomer layer and the lower honeycomb type monomer layer as the bottom edge of the new transverse layered monomer layer, the side wall of the honeycomb type monomer in the upper honeycomb type monomer layer and the lower honeycomb type monomer layer as the side wall of the new transverse layered monomer layer, and the bottom edge of the upper honeycomb type monomer layer and the lower honeycomb type monomer layer which are jointed is taken as the connecting line between the honeycomb type monomers in the newly formed transverse layered monomer layer. By adopting the multilayer transverse laminated monomer layer laminated structure, a plurality of layers of honeycomb structures can be laminated according to the requirement.
Referring to fig. 1-3, the honeycomb-type single body has a wall thickness t. Where a, b, c refer to the median length of the wall thickness. In particular, the distance from one edge center line to the other edge center line is a periodic overlap, and since the shape has a wall thickness, which is the surface for subtracting the wall thickness problem, a, b, c are not direct outer frame distances, but rather median lengths of the wall thicknesses, otherwise 1 wall thickness is less.
Referring to fig. 4-6, the sizes of the inflected hexagonal monomer structures are shown in fig. 4, the sizes of the transverse layered monomer layer structures in the inflected hexagonal negative poisson's ratio structure region are shown in fig. 5, and the stacking mode of the plurality of transverse layered monomer layers in the inflected hexagonal negative poisson's ratio structure region is shown in fig. 6. In one embodiment, the inflected hexagonal negative poisson's ratio structural region is formed by stacking a plurality of transverse layered monomer layers, wherein each transverse layered monomer layer is formed by connecting a plurality of inflected hexagonal monomers at intervals, each inflected hexagonal monomer is formed by 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', the included angle between two adjacent side walls is alpha ', and the length of a connecting line between two adjacent inflected hexagonal monomers in each transverse layered monomer layer is a', and is equal to the length of the bottom edges; the transverse layered monomer layers of two adjacent layers are laminated in a mode that the bottom edge is completely overlapped with the bottom edge, namely after the transverse layered monomer layers of two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of two adjacent layers. And the new horizontal lamellar single layer formed between the adjacent two layers of horizontal lamellar single layers takes the connecting line between the upper and lower two layers of internally folded hexagonal single bodies as the bottom edge of the connecting line, the side wall of the internally folded hexagonal single body in the upper and lower two layers as the side wall of the connecting line, and the bottom edge of the upper and lower two layers of internally folded hexagonal single bodies which are jointed together is taken as the connecting line between the internally folded hexagonal single bodies in the newly formed horizontal lamellar single layer. By adopting the multilayer transverse layered monomer layer laminated structure, countless layer-folded hexagonal negative Poisson ratio structural regions can be stacked according to requirements.
Referring to fig. 4-6, the folded-in hexagonal single body has a wall thickness t ', t ═ t ', where a ', b ', c ' refer to the median length of the wall thickness. In particular, the distance from the center line of one end edge to the center line of the other end edge is a periodic superposition, and since the shape has a wall thickness, which is the surface for subtracting the wall thickness problem, a ', b ', c ' are not direct outer frame distances, but rather the median length of the wall thickness, otherwise 1 wall thickness is less.
Referring to fig. 7, the inflected hexagonal negative poisson's ratio structural regions and the honeycomb structural regions are alternately stacked, and a composite structure interface region is formed at the joint of the inflected hexagonal negative poisson's ratio structural regions and the honeycomb structural regions.
In the composite structure, when the inflected hexagonal negative poisson's ratio structure areas and the honeycomb structure areas are alternately arranged, at least 1 inflected hexagonal negative poisson's ratio structure area and at least two transverse layered monomer layers are arranged in the inflected hexagonal negative poisson's ratio structure areas, and at least two transverse layered monomer layers are arranged in the honeycomb structure areas to exert respective effects. At least 3 internal folding hexagonal monomers are arranged in the transverse layered monomer layer of the internal folding hexagonal negative Poisson ratio structure area, and at least 3 honeycomb monomers are arranged in the transverse layered monomer layer of the honeycomb structure area.
Referring to fig. 7, when the inflected hexagonal negative poisson's ratio structural region and the honeycomb structural region are alternately stacked, the upper and lower layers outside the inflected hexagonal negative poisson's ratio structural region and the honeycomb structural region may be provided with end plate layers.
Referring to fig. 8, 9 and 10, the junction of the inflected hexagonal negative poisson's ratio structural region and the honeycomb structural region is a composite structure interface region,
in the composite structure interface region, the transverse layered monomer layer in the inflected hexagonal negative Poisson ratio structure region is of a half-cycle monomer structure, the transverse layered monomer layer in the honeycomb structure region is also of a half-cycle monomer structure,
the half-circumference monomer structure in the inflected hexagonal negative Poisson ratio structure area means that half of an inflected hexagonal monomer is cut off, a reinforcing edge is added on the remaining half of the inflected hexagonal monomer, the reinforcing edge is connected between the bottom edges of two adjacent inflected hexagonal monomers on the same layer and between two side walls of the inflected hexagonal monomer,
the half-circumference single body structure in the honeycomb type structure area means that half of the honeycomb type single body is cut off, a reinforcing edge is added on the left half of the honeycomb type single body, the reinforcing edge is connected between the bottom edges of two adjacent honeycomb type single bodies on the same layer and is connected on the diagonal line of the honeycomb type single body parallel to the bottom edges,
in the composite structure interface area, the reinforcing edges in the half-circumference monomer structure in the inward-folded hexagonal negative Poisson ratio structure area and the reinforcing edges in the half-circumference monomer structure in the honeycomb structure area are arranged in a staggered mode, and the reinforcing edges in the half-circumference monomer structure in the inward-folded hexagonal negative Poisson ratio structure area and the reinforcing edges in the half-circumference monomer structure in the honeycomb structure composition area are combined into two continuous reinforcing edges which are arranged in parallel.
Referring to fig. 8, 9 and 10, in the composite structure interface region, if the folded-in hexagonal negative poisson ratio structure region is on top and the honeycomb structure region is on bottom, the half-circumference monomer structure in the folded-in hexagonal negative poisson ratio structure region means that the lower half part of the folded-in hexagonal monomer is cut off, and the half-circumference monomer structure in the honeycomb structure region means that the upper half part of the honeycomb monomer is cut off; if the inflected hexagonal negative poisson ratio structure area is located at the lower part and the honeycomb structure area is located at the upper part, the half-circumference monomer structure in the inflected hexagonal negative poisson ratio structure area means that the upper half part of an inflected hexagonal monomer is cut off, and the half-circumference monomer structure in the honeycomb structure area means that the lower half part of the honeycomb monomer is cut off.
Referring to fig. 8, 9 and 10, the cut-away position is along the central axis of the upper and lower structures of the folded-in hexagonal single body or honeycomb type single body.
Referring to fig. 8, 9 and 10, in the interface region of the composite structure, the thickness of the reinforcing edge is equal to that of the honeycomb-type single body or that of the folded hexagonal single body. It can be seen that when a ═ a 'and c ═ c', the obtained half-cycle monomer structures are equivalent, and the number and length of the edges removed and added are also equivalent, so that the operation method is practically the same in material, but the interface structure can enhance the rigidity at the interface, isolate the mutual influence between large and small deformations, and has great significance for the application of multistage unequal deformations.
Referring to fig. 8, 9 and 10, in the composite structure interface region, the connection manner of the half-circumference monomer structure in the inflected hexagonal negative poisson's ratio structure region and the half-circumference monomer structure in the honeycomb structure region is as follows: the reinforcing edge connected between the two side walls of the folded hexagonal single body is superposed with the connecting line on the central axis of the two adjacent honeycomb type single bodies.
The composite energy absorbing structure, after being stretched in three dimensions, can form a plurality of closed pipe structures which can be used for filling liquid (such as for conveying cooling liquid or storing explosion-proof liquid and the like), burying electric components and the like. 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
With reference to fig. 1-10, and with reference to fig. 11, a 56.25mm x 50mm section of a composite structure of type N4C4-B2, the thickness of the single layer being 6.25 mm. a ' is 3.49mm, b ' is 3.46mm, c ' is 6.32mm, and t is about 0.6 mm. The compound mode is as follows: the structure comprises 1 group of inflected hexagonal negative Poisson ratio structure regions and 1 group of honeycomb structure regions, wherein each group of inflected hexagonal negative Poisson ratio structure regions and honeycomb structure regions comprise 4 layers of monomer structures (negative Poisson ratio-N4; honeycomb-C4, N4C4), each layer comprises 5 monomer structures, and the interface state is a planar half-cycle interface structure interface type. 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 is added around the frame, and the thickness of the frame is 0.6 mm.
Example 2
1-10, and 12, is a 68.75mm x 50mm N2C2-B2 section with a single layer thickness of 6.25 mm. a ' is 3.49mm, b ' is 3.46mm, c ' is 6.32mm, and t is about 0.6 mm. The compound mode is as follows: the 2 groups of inflected hexagonal negative Poisson ratio structural regions and the 2 groups of honeycomb structural regions are alternately arranged, each group of inflected hexagonal negative Poisson ratio structural regions and each honeycomb structural region comprise 2 layers of monomer structures (negative Poisson ratio-N2; honeycomb-C2, combined N2C2), each layer comprises 5 monomer structures, and the interface state is a planar 'planar half-cycle' 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 is added around the frame, and the thickness of the frame is 0.6 mm.
The embodiments described above are described to facilitate an 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 (9)
1. A composite energy absorption structure combining a negative Poisson ratio structure and a combined honeycomb structure is characterized in that the composite energy absorption structure comprises an inflected hexagonal negative Poisson ratio structure area and a honeycomb structure area,
the inner-folded hexagonal negative Poisson's ratio structure area is formed by laminating a plurality of layers of transverse layered monomer layers, the transverse layered monomer layer of each layer is formed by connecting a plurality of inner-folded hexagonal monomers at intervals, the bottom edge of the transverse layered monomer layer of each two adjacent layers is completely overlapped with the bottom edge, namely after the transverse layered monomer layers of each two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of each two adjacent layers;
the honeycomb type structure area is formed by laminating a plurality of transverse layered monomer layers, each transverse layered monomer layer is formed by connecting a plurality of honeycomb type monomers at intervals, the honeycomb type monomers are of a hexagonal structure, the transverse layered monomer layers of two adjacent layers are laminated in a mode that the bottom edges are completely overlapped with the bottom edges, namely after the transverse layered monomer layers of two adjacent layers are laminated, a new transverse layered monomer layer is formed between the transverse layered monomer layers of two adjacent layers;
the inflected hexagonal negative poisson ratio structural regions and the honeycomb structural regions are alternately stacked, the joint of the inflected hexagonal negative poisson ratio structural regions and the honeycomb structural regions is a composite structure interface region,
in the composite structure interface region, the transverse layered monomer layer in the inflected hexagonal negative Poisson ratio structure region is of a half-cycle monomer structure, the transverse layered monomer layer in the honeycomb structure region is also of a half-cycle monomer structure,
the half-circumference monomer structure in the inflected hexagonal negative Poisson ratio structure area means that half of an inflected hexagonal monomer is cut off, a reinforcing edge is added on the remaining half of the inflected hexagonal monomer, the reinforcing edge is connected between the bottom edges of two adjacent inflected hexagonal monomers on the same layer and between two side walls of the inflected hexagonal monomer,
the half-circumference single body structure in the honeycomb type structure area means that half of the honeycomb type single body is cut off, a reinforcing edge is added on the left half of the honeycomb type single body, the reinforcing edge is connected between the bottom edges of two adjacent honeycomb type single bodies on the same layer and is connected on the diagonal line of the honeycomb type single body parallel to the bottom edges,
in the composite structure interface area, the reinforcing edges in the half-circumference monomer structure in the inward-folded hexagonal negative Poisson ratio structure area and the reinforcing edges in the half-circumference monomer structure in the honeycomb structure area are arranged in a staggered mode, and the reinforcing edges in the half-circumference monomer structure in the inward-folded hexagonal negative Poisson ratio structure area and the reinforcing edges in the half-circumference monomer structure in the honeycomb structure composition area are combined into two continuous reinforcing edges which are arranged in parallel.
2. The composite energy absorbing structure of claim 1 wherein, in the composite structure interface region,
if the inward-folded hexagonal negative poisson ratio structure area is located at the upper part and the honeycomb structure area is located at the lower part, the half-circumference monomer structure in the inward-folded hexagonal negative poisson ratio structure area means that the lower half part of an inward-folded hexagonal monomer is cut off, and the half-circumference monomer structure in the honeycomb structure area means that the upper half part of the honeycomb monomer is cut off;
if the inflected hexagonal negative poisson ratio structure area is located at the lower part and the honeycomb structure area is located at the upper part, the half-circumference monomer structure in the inflected hexagonal negative poisson ratio structure area means that the upper half part of an inflected hexagonal monomer is cut off, and the half-circumference monomer structure in the honeycomb structure area means that the lower half part of the honeycomb monomer is cut off.
3. The composite energy absorbing structure of claim 1, wherein the cut-off position is along the central axis of the folded hexagonal single body or the honeycomb single body upper and lower structures.
4. The composite energy absorbing structure of claim 1 in combination with a negative Poisson's ratio structure and a bonded honeycomb structure,
the inward-folded hexagonal 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 ', the included angle of two adjacent side walls is alpha ', the length of a connecting line between two adjacent inward-folded hexagonal monomers in the transverse layered monomer layer is a ', the length of the connecting line is equal to the length of the bottom edges, and the wall thickness of the honeycomb type monomer is t;
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 length of a connecting line between two adjacent honeycomb type monomers in the transverse layered monomer layer is a, the length of the connecting line is equal to the length of the bottom edges, and the wall thickness of the inward-folded hexagonal monomer is t';
in the composite structure interface area, the dimensional parameter relationship between the honeycomb type monomer and the folded hexagon monomer is as follows: a, c, and t are a ', c, and t'.
5. The composite energy absorbing structure of claim 4, wherein in the honeycomb monolith, a, b and c refer to wall thickness median lengths;
in the inflected hexagonal monomer, a ', b ' and c ' refer to the median length of the wall thickness.
6. The composite energy absorbing structure of claim 4 wherein, in the composite structure interface region,
the connection mode of the half-cycle monomer structure in the inflected hexagonal negative Poisson ratio structure region and the half-cycle monomer structure in the honeycomb structure region is as follows: the reinforcing edge connected between the two side walls of the folded hexagonal single body is superposed with the connecting line on the central axis of the two adjacent honeycomb type single bodies.
7. The composite energy absorbing structure combining the negative Poisson ratio structure and the combined honeycomb structure as claimed in claim 1, wherein when the inflected hexagonal negative Poisson ratio structure regions and the honeycomb structure regions are alternately arranged, the inflected hexagonal negative Poisson ratio structure regions and the honeycomb structure regions are at least 1, the inflected hexagonal negative Poisson ratio structure regions have at least two layers of transverse lamellar monomer layers, and the honeycomb structure regions have at least two layers of transverse lamellar monomer layers.
8. The composite energy absorbing structure of claim 4, wherein at least 3 hexagonal monomers are folded in the transverse layered monomer layers of the folded-in hexagonal negative Poisson's ratio structure region, and at least 3 honeycomb monomers are folded in the transverse layered monomer layers of the honeycomb structure region.
9. The composite energy absorbing structure of claim 1 in combination with a negative poisson's ratio structure and a bonded honeycomb structure, 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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