阅读说明：本技术 一种多方案吸能夹层板结构 (Multi-scheme energy-absorbing sandwich plate structure ) 是由 郝琪 刘宇 毛怡 田钰楠 于 2019-10-16 设计创作，主要内容包括：本发明涉及材料结构技术领域,尤其涉及一种多方案吸能夹层板结构,包括两层覆盖板和位于两层所述覆盖板之间的夹芯层,所述夹芯层包括若干个单胞结构,所述单胞结构包括内部结构和位于所述内部结构两侧的外部结构,所述内部结构包括两个等腰三角形结构,两个所述等腰三角形结构顶角相连接,底边相互平行,所述外部结构包括两个钝角三角形结构,所述钝角三角形结构的最长边与所述等腰三角形结构的腰边重合或共用。本发明夹芯层的单胞结构由两个等腰三角形结构和四个钝角三角形结构组成,可以提高单胞结构的稳定性,使单胞结构受力时不易发生变形,有利于提高夹层板结构的吸能、抗冲击和承载性能。(The invention relates to the technical field of material structures, in particular to a multi-scheme energy-absorbing sandwich plate structure which comprises two covering plates and a sandwich layer positioned between the two covering plates, wherein the sandwich layer comprises a plurality of unit cell structures, each unit cell structure comprises an inner structure and outer structures positioned on two sides of the inner structure, each inner structure comprises two isosceles triangle structures, the vertex angles of the two isosceles triangle structures are connected, the bottom edges of the two isosceles triangle structures are parallel to each other, each outer structure comprises two obtuse triangle structures, and the longest edge of each obtuse triangle structure is overlapped with or shared by the waist edges of the corresponding isosceles triangle structures. The single cell structure of the sandwich layer consists of two isosceles triangle structures and four obtuse triangle structures, so that the stability of the single cell structure can be improved, the single cell structure is not easy to deform when stressed, and the energy absorption, impact resistance and bearing performance of the sandwich layer structure are improved.)

1. The utility model provides a multi-scheme energy-absorbing sandwich panel structure which characterized in that: comprises two covering plates (1) and a sandwich layer (2), wherein the sandwich layer (2) is positioned between the two covering plates (1), the sandwich layer (2) comprises a plurality of unit cell structures (3), each unit cell structure (3) comprises an inner structure (4) and outer structures (5) positioned on two sides of the inner structure (4), the internal structure (4) comprises two isosceles triangle structures (41) with the same size and shape, the vertex angles of the two isosceles triangle structures (41) are connected, the bottom edges are parallel to each other, the outer structure (5) comprises two obtuse triangular structures (51) with the same size and shape, the longest side of the obtuse triangle structure (51) is coincided with or shared by the waist sides of the isosceles triangle structures (41), the longest side of the obtuse triangle structure (51) is equal to the length of the waist side of the isosceles triangle structure (41).

2. A multi-scheme energy absorbing sandwich panel structure according to claim 1 wherein: the sandwich layer (2) is formed by arranging a plurality of unit cell structures (3), and two ends of the side parts of two adjacent unit cell structures (3) in the X direction are connected.

3. A multi-scheme energy absorbing sandwich panel structure according to claim 2 wherein: the outer parallel sides of two adjacent unit cell structures (3) in the Y direction are coincident or shared.

4. A multi-scheme energy absorbing sandwich panel structure according to claim 1 wherein: the sandwich layer (2) is formed by arranging a plurality of unit cell structures (3) and connecting plates (6), the connecting plates (6) are located between two adjacent unit cell structures (3) in the X direction, two ends of each connecting plate (6) are respectively connected with the middle parts of the side parts of the unit cell structures (3), and two ends of the side parts of the adjacent unit cell structures (3) are connected.

5. A multi-scheme energy absorbing sandwich panel structure according to claim 4 wherein: the outer parallel sides of two adjacent unit cell structures (3) in the Y direction are coincident or shared.

6. A multi-scheme energy absorbing sandwich panel structure according to claim 1 wherein: the sandwich layer (2) is formed by arranging a plurality of unit cell structures (3) and a plurality of second unit cell structures (7), the size and the shape of the upper half part of each second unit cell structure (7) are the same as those of the lower half part of each unit cell structure (3), the size and the shape of the lower half part of each second unit cell structure (7) are the same as those of the upper half part of each unit cell structure (3), and the side edge of each unit cell structure (3) in the X direction is superposed or shared with the side edge of the adjacent second unit cell structure (7).

7. A multi-scheme energy absorbing sandwich panel structure according to claim 6 wherein: the unit cell structure (3) is coincided with or shared by the outer parallel sides of the adjacent unit cell structure (3) or the second unit cell structure (7) in the Y direction.

8. A multi-scheme energy absorbing sandwich panel structure according to claim 1 wherein: the two obtuse triangle structures (51) of the outer structure (5) are overlapped or share one bevel edge, and the bevel edge is parallel to the bottom edge of the isosceles triangle structure (51).

9. A multi-scheme energy absorbing sandwich panel structure according to claim 1 wherein: the unit cell structure (3) is a centrosymmetric structure.

Technical Field

The invention relates to the technical field of material structures, in particular to a multi-scheme energy-absorbing sandwich plate structure.

Background

The sandwich plate structure is a structural material consisting of two surface covering plates with higher strength and a light sandwich layer filled between the two covering plates. The sandwich plate has the advantages of light weight, high strength, good heat and sound insulation effect, excellent mechanical property, good energy absorption characteristic and the like, and is widely applied to the fields of aerospace, automobiles, ships, packaging and transportation and the like. The sandwich plate structure can be divided into a foam sandwich plate structure, a wave plate sandwich plate structure and a honeycomb sandwich plate structure according to different types of sandwich layers.

In the sandwich plate structure, the sandwich layer is a middle structure for connecting the upper surface covering plate and the lower surface covering plate, plays a key role in the exertion of the mechanical property of the sandwich plate, particularly the energy absorption characteristic, and the energy absorption efficiency of the sandwich layer structure is a determining factor for embodying the protective property of the sandwich plate structure. The sandwich layer structure with reasonable design can not only absorb a part of energy, but also improve the bearing capacity of the sandwich plate.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a multi-scheme energy-absorbing sandwich plate structure which is good in energy-absorbing effect, strong in impact resistance and strong in bearing capacity.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a multi-scheme energy-absorbing sandwich plate structure, includes two-layer overlay and sandwich layer, the sandwich layer is located two-layerly between the overlay, the sandwich layer includes a plurality of unit cell structure, the unit cell structure includes inner structure and is located the exterior structure of inner structure both sides, inner structure includes two isosceles triangle structures that size and shape are the same, two the isosceles triangle structure apex angle is connected, and the base is parallel to each other, exterior structure includes two obtuse triangle structures that size and shape are the same, the longest side of obtuse triangle structure with the waist coincidence or the sharing of isosceles triangle structure, the longest side of obtuse triangle structure with the waist length of isosceles triangle structure equals.

Furthermore, the sandwich layer is formed by arranging a plurality of unit cell structures, and two ends of the side part of each unit cell structure adjacent to each other in the X direction are connected.

Furthermore, the outer parallel sides of two adjacent unit cell structures in the Y direction are coincident or shared.

Furthermore, the sandwich layer is formed by arranging a plurality of unit cell structures and connecting plates, the connecting plates are located between two adjacent unit cell structures in the X direction, two ends of each connecting plate are respectively connected with the middle parts of the side parts of the unit cell structures, and two ends of the side parts of the adjacent two unit cell structures are connected.

Furthermore, the outer parallel sides of two adjacent unit cell structures in the Y direction are coincident or shared.

Furthermore, the sandwich layer is formed by arranging a plurality of unit cell structures and a plurality of second unit cell structures, the size and the shape of the upper half part of each second unit cell structure are the same as those of the lower half part of each unit cell structure, the size and the shape of the lower half part of each second unit cell structure are the same as those of the upper half part of each unit cell structure, and the side edge of each unit cell structure in the X direction is coincided with or shared by the side edge of the adjacent second unit cell structure.

Further, the unit cell structure in the Y direction is coincident with or shared by the outer parallel sides of the adjacent unit cell structure or the second unit cell structure.

Further, two obtuse triangle structures of the outer structure are overlapped or share one bevel edge, and the bevel edge is parallel to the bottom edge of the isosceles triangle structure.

Further, the unit cell structure is a centrosymmetric structure.

The invention has the beneficial effects that:

1. the unit cell structure consists of four obtuse triangle structures and two isosceles triangle structures, when an external load is applied, the isosceles triangle structures and the obtuse triangle structures are deformed, the vertex angle of the isosceles triangle structure and the obtuse angle of the obtuse triangle structure are enlarged, and the upper part, the lower part and the two side parts of the unit cell structure are deformed and contracted towards the middle, so that the unit cell structure presents an obvious negative Poisson ratio characteristic; the triangular structure has higher stability, so that the unit cell structure is not easy to deform when stressed, and the sandwich plate structure has higher energy absorption and impact resistance and higher bearing capacity;

2. the arrangement of the single cell structure can form a plurality of bearing surfaces in the sandwich layer, thereby improving or improving the bearing capacity of the sandwich plate structure and improving the energy absorption and impact resistance of the sandwich plate;

3. the sandwich layer in the sandwich plate structure has various arrangement forms, can be adjusted according to actual production requirements, meets the requirements of different fields, and has wider application range.

Drawings

FIG. 1 is a schematic diagram of a sandwich core cell structure of the present invention.

Fig. 2 is a schematic structural diagram of the first embodiment of the present invention.

Fig. 3 is a schematic view showing the arrangement of the internal structure of the sandwich layer according to the first embodiment.

Fig. 4 is a schematic structural diagram of a second embodiment of the present invention.

FIG. 5 is a schematic view showing the arrangement of the internal structure of the sandwich layer according to the second embodiment.

Fig. 6 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 7 is a schematic view showing the arrangement of the internal structure of the sandwich layer according to the third embodiment.

Description of reference numerals:

1-covering plate, 2-sandwich layer, 3-unit cell structure, 4-internal structure, 41-isosceles triangle structure, 5-external structure, 51-obtuse triangle structure, 6-connecting plate, 7-second unit cell structure.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples, which are not intended to limit the scope of the invention.

As shown in fig. 1 to 7, the present invention discloses a multi-scheme energy-absorbing sandwich plate structure, which includes two cladding plates 1 and a sandwich layer 2, wherein the sandwich layer 2 is located between the two cladding plates 1, the sandwich layer 2 includes a plurality of unit cell structures 3, the cladding plates 1 are mainly used as a load-bearing platform and have a function of dispersing and transmitting load, and the sandwich layer 2 mainly has a function of deformation energy-absorbing and load-bearing; as shown in fig. 1, the unit cell structure 3 includes an inner structure 4 and outer structures 5 symmetrically disposed at both sides of the inner structure 4, the internal structure 4 comprises two isosceles triangle structures 41 with the same size and shape, the vertex angles of the two isosceles triangle structures 41 are connected, the bottom edges are parallel to each other, the outer structure 5 comprises two obtuse triangular structures 51 of the same size and shape, the longest side of the obtuse triangular structure 51 coincides with or is shared by the waist sides of the isosceles triangular structures 41, the longest side of the obtuse triangular structure 51 is equal to the length of the waist side of the isosceles triangular structure 41, the two obtuse triangular structures 51 of the outer structure 5 coincide or share an oblique side, the bevel edge is parallel to the bottom edge of the isosceles triangle structure 51, and the unit cell structure 3 is in a vertically and horizontally symmetrical structure. When an external load is applied, the obtuse angle of the obtuse triangular structure 51 is increased, the vertex angle of the isosceles triangular structure 41 is also increased, and the triangle has high stability, so that each side of the triangle cannot fail and break, the obtuse angles of the obtuse triangular structures 51 recessed at two sides move towards the middle of the structure, the unit cell structures 3 deform towards the center direction of the unit cell structures 3 in the transverse direction and the longitudinal direction, and each unit cell structure 3 has an obvious negative Poisson ratio characteristic.

As shown in fig. 2 and 3, in the first embodiment of the present invention, the sandwich layer 2 is a single-layer sandwich layer 2 formed by arranging a plurality of unit cell structures 3 along the X direction, or a sandwich layer 2 formed by arranging a plurality of unit cell structures 3 along the XY direction, two ends of the side portions of two adjacent unit cell structures 3 in the X direction are connected, and the outer parallel sides of two adjacent unit cell structures 3 in the Y direction are overlapped or shared. The parallel edges at the two ends of the sandwich layer 2 are respectively connected with the two covering plates 1 to form a bearing surface of the sandwich plate structure; in the sandwich layer 2 with a multilayer structure, each layer of unit cell structures 3 is connected with the adjacent layer of unit cell structures 3 to form a bearing surface, so that the multilayer bearing surface is formed. When external impact is applied, the inner sandwich layer 2 deforms according to a column deformation mode, the deformation of each column of unit cell structures 3 has little influence on adjacent columns, the deformation independence of each column is large, when a certain area of the covering plate 1 is in contact with the outside to be stressed, the unit cell structures 3 in the contact area are stressed to shrink, and the shrinkage deformation of the other column of unit cell structures 3 which are not under the contact area is very small.

As shown in fig. 4 and 5, in the second embodiment of the present invention, the sandwich layer 2 is formed by arranging a plurality of unit cell structures 3 and a connecting plate 6 to form a sandwich layer 2 of a single-layer or multi-layer structure, the connecting plate 6 is located between two adjacent unit cell structures 3 in the X direction, two ends of the connecting plate 6 are respectively connected to the middle of the side portions of the unit cell structures 3, two ends of the side portions of two adjacent unit cell structures 3 are connected, and the outer parallel sides of two adjacent unit cell structures 3 in the Y direction in the sandwich layer 2 of the multi-layer structure are overlapped or shared.

The connecting plates 6 can ensure that each row of unit cell structures 3 of the sandwich layer 2 do not deform independently when the sandwich plate is loaded, and each unit cell structure 3 on the same layer forms a whole through the connecting plates 6 when the sandwich plate deforms. When the sandwich plate structure is stressed, the upper half part and the lower half part of the unit cell structure 3 both contract towards the middle part, when the unit cell structure deforms and moves to the position of the middle connecting plate 6, a bearing surface parallel to the covering plate 1 can be formed in the position of the connecting plate 6 in the sandwich layer 2, the bearing surface can play a stronger bearing and compression resisting role than the covering plate 1, the number of the bearing surfaces depends on the number of layers of the sandwich layer arrangement, and the more the number of the bearing surfaces appears in the range allowed by the size of the sandwich plate structure, the stronger the energy absorption, compression resisting and bearing capacities of the sandwich plate are.

In addition, the bearing surface formed by the connecting plates 6 can be used as a main energy absorption bearing part, when the small area of the sandwich plate is stressed, the bearing surface can buffer the transmitted force, in the sandwich layer 2 with the multilayer structure, when the outer bearing surface deforms to the limit, the sandwich layer 2 continuously contracts downwards or inwards, the outer bearing surface can pull other unit cell structures 3 outside the stressed contact area, the unit cell structures 3 below the stressed contact area are shown to deform firstly, and when the limit of one bearing surface is reached, the unit cell structures 3 outside the stressed area contract towards the stressed center, so that the sandwich layer achieves higher energy absorption effect.

As shown in fig. 6 and 7, according to a third embodiment of the present invention, the sandwich layer 2 is formed by arranging a plurality of the unit cell structures 3 and a plurality of the second unit cell structures 7 in the XY direction, the size and shape of the upper half of the second unit cell structure 7 are the same as those of the lower half of the unit cell structure 3, the size and shape of the lower half of the second unit cell structure 7 are the same as those of the upper half of the unit cell structure 3, the side edge of the unit cell structure 3 in the X direction coincides with or shares with the side edge of the adjacent second unit cell structure 7, and the unit cell structure 3 coincides with or shares with the outer parallel edge of the adjacent unit cell structure 3 or the adjacent second unit cell structure 7 in the Y direction. The sandwich layer 2 forms a whole by arranging the unit cell structures 3 and the second unit cell structures 7 at intervals, when the sandwich layer is subjected to small-area contact stress, the unit cell structures 3 or the second unit cell structures 7 under the stress area deform, and because each line of unit cell structures adopts a mode of being connected with the second unit cell structures at intervals, the unit cell structures 3 or the second unit cell structures 7 adjacent to the unit cell structures 3 or the second unit cell structures 7 which deform are subjected to transverse tension, the state of moving and deforming towards the lower part of the stress area is presented, so that the materials of the sandwich layer 2 all move towards the stress area, the materials are stacked more rapidly, the structure density is increased rapidly, the integral hardness of the sandwich layer can reach the limit more rapidly, and the sandwich layer has higher energy absorption and impact resistance effects.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.