JP2022173181A - Compound energy absorption layer, interposition layer structure, and manufacturing method of interposition layer structure - Google Patents

Abstract

To provide a compound energy absorption structure which is gradually destroyed when receiving a large impact force and can absorb a larger amount of energy when destroyed to increase energy absorption effect.SOLUTION: A compound energy absorption layer includes multiple energy absorption core layers 1 sequentially provided from the upper side to the lower side. Each energy absorption core layer 1 includes multiple energy absorption cavities which are provided partitioned from each other. The multiple energy absorption cavities located at a middle part of each energy absorption core layer 1 are provided sealed. The multiple energy absorption cavities located at edges of each energy absorption core layer 1 have openings. An included angle of an upper part of each energy absorption cavity is set as a first two face angle 115. The first two face angles 115 of the multiple energy absorption core layers 1 sequentially reduce from the upper side to the lower side. The first two face angle 115 of each energy absorption core layer 1 sequentially reduces from the upper side to the lower side.SELECTED DRAWING: Figure 1

Description

The present invention relates to the technical field of energy absorbing materials, and more particularly to composite energy absorbing layers, intervening layer structures and manufacturing methods.

BACKGROUND OF THE INVENTION Conventionally, with the increasing number of motor vehicles and the ever-increasing possibility of vehicle impact accidents, people are paying more and more attention to the safety protection performance of automobiles. The shock-absorbing energy-absorbing structure located at the front end of the vehicle has a great impact on the results of vehicle safety performance tests, so energy-absorbing materials with excellent impact resistance are always the focus of research.

Thin-walled structures can not only absorb energy efficiently, but also have a low mass, improve vehicle impact performance, and improve the fuel economy of vehicles, thus thin-walled structures are useful for transportation. Widely applied in impact systems. However, the conventional thin-walled structure is generally a uniform structure, and the optimal load-bearing surface of the thin-walled structure can be designed in the direction facing the impact force to exhibit a high energy absorption effect under the action of the impact load. However, when the load is large and the energy load limit of the thin-walled structure is reached, the uniform thin-walled structure will randomly break at any cross-sectional position. Due to the change in fixture between the surface and the direction of force application, the optimal load-bearing surface of the thin-walled structure cannot face the direction of force application, and therefore, after a certain cross-section is broken, the thin-walled structure Since the overall compressive strength is rapidly degraded, the energy absorption effect is greatly degraded.

The technical problem to be solved by the present invention is that the conventional thin-walled structure uses a uniform structure, and after a certain section is impacted and broken, the overall compressive strength of the thin-walled structure is rapidly reduced, and the energy absorption effect is is that the

To solve the above technical problems, the present invention provides a composite energy absorption layer, the composite energy absorption layer comprises multiple layers of energy absorption core layers arranged in order from top to bottom,
Each of the energy-absorbing core layers includes a plurality of partitioned energy-absorbing cavities, and the plurality of energy-absorbing cavities located in the middle of each of the energy-absorbing core layers are sealed, each of the plurality of energy absorbing cavities located at the edge of each of the energy absorbing core layers has an opening;
The included angle of the upper portion of each energy-absorbing cavity is defined as a first dihedral angle, and the first dihedral angles of the multiple energy-absorbing core layers decrease in order from top to bottom.

As a suitable technical proposal, each of the energy absorption cavities has a horizontal quadrangular prism shape,
The four sides of the horizontal quadrangular prism-shaped energy absorption cavity are a first face plate, a second face plate, a third face plate and a fourth face plate in order, the first face plate and the second face plate are located on the top, and the third face plate is located on the top. The face plate and the fourth face plate are positioned at the lower portion, and the included angle between the first face plate and the second face plate is the first dihedral angle.

As a preferred technical solution, the energy absorbing cavity located in the middle is the first energy absorbing cavity, and the energy absorbing cavity adjacent to the first energy absorbing cavity and located above and to the left of the first energy absorbing cavity is the second energy absorbing cavity. an energy absorbing cavity, an energy absorbing cavity adjacent to the first energy absorbing cavity and located above and to the right of the first energy absorbing cavity being a third energy absorbing cavity; The energy absorbing cavity positioned right below the first energy absorbing cavity is defined as a fourth energy absorbing cavity, and the energy absorbing cavity adjacent to the first energy absorbing cavity and positioned below and to the left of the first energy absorbing cavity is defined as a fifth energy absorbing cavity. as an absorption cavity,
A first faceplate of the first energy absorption cavity and a third faceplate of the second energy absorption cavity are provided overlapping, and a second faceplate of the first energy absorption cavity and a fourth faceplate of the third energy absorption cavity are overlapped. a third faceplate of the first energy absorption cavity and a first faceplate of the fourth energy absorption cavity are provided overlapping each other; and a fourth faceplate of the first energy absorption cavity and a first faceplate of the fifth energy absorption cavity A two-sided board is provided overlapping.

As a preferred technical solution, the energy-absorbing cavities adjacent to the lowest energy-absorbing core layer are the left energy-absorbing cavity and the right energy-absorbing cavity, respectively, and the third face plate of the left energy-absorbing cavity and the right energy-absorbing cavity are The included angle with the fourth face plate is defined as a second dihedral angle, and the second dihedral angle is smaller than the first dihedral angle of the last energy-absorbing core layer.

As a preferred technical proposal, the energy-absorbing core layer has three layers, the dihedral angle of the first energy-absorbing core layer is 97° or less and 93° or more, and the second energy-absorbing core layer The dihedral angle is 84° or less and 80° or more, the dihedral angle of the third energy absorbing core layer is 72° or less and 68° or more, and the second dihedral angle is 60° or less. and greater than or equal to 56°.

As a preferred technical solution, the first dihedral angle of the first energy-absorbing core layer is 95°, the first dihedral angle of the second energy-absorbing core layer is 82°, and the third The first dihedral angle of the energy absorbing core layer is 70° and the second dihedral angle is 58°.

An intervening layer structure including the above composite energy absorbing layer, wherein an upper plate is adhesively fixed to the upper part of the composite energy absorbing layer, and a lower plate is adhesively fixed to the lower part of the energy absorbing composite layer.

As a preferred technical solution, both the upper plate and the lower plate are aluminum alloy plates.

A method for manufacturing the intervening layer structure described above,
a step S1 of constructing a three-dimensional digital model of the composite energy absorbing layer;
a step S2 of 3D printing a composite energy absorption layer based on the three-dimensional digital model of the composite energy absorption layer;
a step S3 of adhering an upper plate to the upper portion of the composite energy absorption layer and adhering a lower plate to the lower portion of the composite energy absorption layer.

As a preferred technical solution, the upper plate and the lower plate are both aluminum alloy plates, the raw material of the composite energy absorption layer is nylon powder particles, and the crystallization temperature during 3D printing is 146 ° C. and the core layer density is 1010 kg/m ³ .

As a preferred technical solution, the intervening layer structure is subjected to an impact resistance test after step S3.

Compared with the prior art, the beneficial effects of the composite energy absorbing layer, intervening layer structure and manufacturing method of the embodiments of the present invention are as follows.
The composite energy-absorbing layer of the present invention comprises a plurality of energy-absorbing core layers arranged in order from top to bottom, each energy-absorbing core layer comprising a plurality of partitioned energy-absorbing cavities. a plurality of energy-absorbing cavities located in the middle of the energy-absorbing core layer are all hermetically sealed; The included angle of the upper portion of the energy-absorbing cavity is defined as a first dihedral angle, and the first dihedral angles of the multiple energy-absorbing core layers decrease in order from top to bottom. The first dihedral angle of each energy-absorbing core layer decreases from top to bottom until the dihedral angle is maximized when an impact force acts on the composite energy-absorbing layers of the present invention in a direction perpendicular to the energy-absorbing core layers. The first energy absorbing core layer is destroyed first, then the second energy absorbing core layer, and so on until the last energy absorbing core layer. As the number of broken energy-absorbing core layers increases, the first dihedral angle decreases, and the cushioning force generated by the energy-absorbing core layers gradually increases, so that the composite energy-absorbing layer of this example has a large impact When subjected to force, it will be destroyed step by step, and when it is destroyed, it can absorb more energy, and the energy absorption effect will be higher.

FIG. 3 is a structural schematic diagram of a composite energy absorption layer in an embodiment of the present invention; FIG. 4 is a structural schematic diagram of the energy-absorbing cavity of the first energy-absorbing core layer of the composite energy-absorbing layer of the embodiment of the present invention; FIG. 4 is a structural schematic diagram of the upper face plate of the energy absorbing cavity of the first energy absorbing core layer of the composite energy absorbing layer of the embodiment of the present invention; FIG. 3 is a structural schematic diagram of an intervening layer structure in an embodiment of the present invention; It is the result of performing an impact resistance test on the intervening layer structure by the manufacturing method of the intervening layer structure of the example of the present invention.

Hereinafter, specific embodiments of the present invention will be described in more detail by combining drawings and examples. The following examples are intended to illustrate the invention without, however, limiting its scope.

In the description of the present invention, orientations or positional relationships indicated by terms such as "top", "bottom", "left", "right", "top", "bottom" refer to the orientations or positional relationships shown in the drawings. and is merely for the purpose of describing and simplifying the description of the invention, and indicates or suggests that the device or elements shown have a particular orientation, or that they are configured or operated in a particular orientation. rather, and therefore should not be understood as a limitation on the present invention. In the present invention, terms such as 'first' and 'second' are used to describe various information, but these information should not be limited to these terms. It should be understood that these terms are used to distinguish similar types of information from each other. For example, "first" information could be termed "second" information, and similarly "second" information could be termed "first" information, without departing from the scope of the present invention. It is possible to be

The composite energy-absorbing layer of the preferred embodiment of the present invention comprises a plurality of energy-absorbing core layers arranged in order from top to bottom, each energy-absorbing core layer comprising a plurality of partitioned energy-absorbing core layers. a plurality of energy-absorbing cavities located in the middle of each energy-absorbing core layer, including an energy-absorbing cavity, all hermetically disposed, and each of the plurality of energy-absorbing cavities located at the edge of each energy-absorbing core layer having openings; The top included angle of each energy-absorbing cavity is defined as a first dihedral angle, and the first dihedral angles of the multiple energy-absorbing core layers decrease from top to bottom.

The number of layers of the energy-absorbing core layer and the thickness of the energy-absorbing core layer are rationally selected according to the strength needs in use, and as shown in FIG. As an example, the composite energy absorbing core layer of the present invention will be described. The first energy-absorbing core layer 1 includes a plurality of energy-absorbing cavities 11, the middle part of the energy-absorbing cavities 11 is a hollow structure, and the top included angle of the energy-absorbing cavities 11 is the first dihedral angle of the first energy-absorbing core layer 115, the upper included angle of the energy absorbing cavity 21 of the second energy absorbing core layer 2 is the first dihedral angle 215 of the second energy absorbing core layer, and the upper included angle of the energy absorbing cavity 31 of the third energy absorbing core layer is the first dihedral angle 315 of the third energy absorbing core layer, the first dihedral angle 215 of the second energy absorbing core layer is less than the first dihedral angle 115 of the first energy absorbing core layer, and the third energy The first dihedral angle 315 of the absorbing core layer is smaller than the first dihedral angle 215 of the second energy absorbing core layer.

When an impact force acts on the composite energy-absorbing layer of this embodiment along a direction perpendicular to the energy-absorbing core layer, the first energy-absorbing core layer having the largest first dihedral angle is broken first, and then the second energy-absorbing core layer is destroyed. The energy absorbing core layers are destroyed and so on until the last energy absorbing core layer is destroyed. In addition, as the number of broken energy-absorbing core layers increases, the cushioning force generated by the energy-absorbing core layers gradually increases. When hit, it will be destroyed step by step, and when destroyed, it can absorb more energy, and the energy absorption effect is higher.

Preferably, the first dihedral angle 15 of the first energy absorbing core layer is less than or equal to 100° and 90° or more, and the first dihedral angle of the lowermost energy-absorbing core layer is 50° or more.

The energy absorption cavity of each energy absorption core layer has a horizontal square prism shape, and the four side surfaces of the horizontal square prism energy absorption cavity are the first face plate, the second face plate, the third face plate and the fourth face plate in that order, The first face plate and the second face plate are located on the top, the third face plate and the fourth face plate are located on the bottom, and the included angle between the first face plate and the second face plate is the first dihedral angle.

As shown in FIG. 1, the structure of the energy absorption cavity will be described by taking the first energy absorption cavity 11 as an example. The energy-absorbing cavity 11 of the first energy-absorbing core layer is in the shape of a square prism arranged laterally, and the four sides of the square-pillar energy-absorbing cavity are sequentially formed by the first face plate 111, the second face plate 112, the third face plate 113 and the A fourth face plate 114, of which the first face plate 111 and the second face plate 112 are positioned on the top of the square prism, and the included angle between the first face plate 111 and the second face plate 112 is the first energy absorption core layer is the first dihedral angle 115 of .

Further, in this embodiment, as shown in FIGS. 2 and 3, the first energy absorbing cavity 11 includes a front energy absorbing cavity 11a and a rear energy absorbing cavity 11b, and a front energy absorbing cavity 11a and a rear energy absorbing cavity 11b. are square poles, the side edges of the front energy absorption cavity 11a are provided obliquely along the front-rear direction, and the side edges of the rear energy absorption cavity 11b correspond to the respective side edges of the front energy absorption cavity 11a. The rear end of the first face plate 111a of the front energy absorption cavity 11a is sealingly connected to the front end of the first face plate 111b of the rear energy absorption cavity 11b, and the second face plate 112a of the front energy absorption cavity 11a. the rear end of which is sealingly connected to the front end of the second faceplate 112b of the rear energy absorption cavity 11b, the rear end of the third faceplate of the front energy absorption cavity 11a is sealingly connected to the front end of the third faceplate of the rear energy absorption cavity 11b, The rear end of the fourth faceplate of the front energy absorption cavity 11a is sealingly connected to the front end of the fourth faceplate of the rear energy absorption cavity 11b, preferably the front energy absorption cavity 11a and the rear energy absorption cavity 11b are symmetrically forward and backward. further, the dihedral angle between the first faceplate of the front energy absorption cavity 11a and the first faceplate of the rear energy absorption cavity 11b is 90°, and the fourth faceplate of the front energy absorption cavity 11a and the rear energy absorption The dihedral angle between the cavity 11b and the fourth face plate is 90°.

The front energy absorption cavity 11a and the rear energy absorption cavity 11b are provided so as to form a predetermined inclination angle. It can improve the stability of the energy-absorbing core layer when receiving acting force in a direction, and further improve the energy-absorbing effect of the energy-absorbing core layer.

In this embodiment, there are a plurality of connection methods between vertically adjacent energy absorbing core layers. For example, a flat plate is connected under the first energy absorbing core layer 1, and a second energy absorbing core layer A core layer 2 is connected. For the convenience of explaining the connection relationship of each energy absorbing cavity, as shown in FIG. The energy absorbing cavity located above and to the left of the first energy absorbing cavity a is defined as a second energy absorbing cavity b, adjacent to the first energy absorbing cavity a and located above and to the right of the first energy absorbing cavity a. The energy absorbing cavity is defined as a third energy absorbing cavity c, the energy absorbing cavity adjacent to the first energy absorbing cavity a and located to the lower right of the first energy absorbing cavity a is defined as a fourth energy absorbing cavity d, and the first energy absorbing cavity is defined as The energy absorbing cavity adjacent to the cavity a and positioned to the left and below the first energy absorbing cavity a is a fifth energy absorbing cavity e;
The first face plate of the first energy absorption cavity a and the third face plate of the second energy absorption cavity b are overlapped, and the second face plate of the first energy absorption cavity a and the fourth face plate of the third energy absorption cavity c are overlapped. the third face plate of the first energy absorption cavity a and the first face plate of the fourth energy absorption cavity d are provided overlapping each other; the fourth face plate of the first energy absorption cavity a and the first face plate of the fifth energy absorption cavity e The two-sided plates are superimposed, and the energy-absorbing cavity has a honeycomb shape, which can ensure a strong connection between each energy-absorbing core layer, and also saves materials and meets the design requirements of vehicle weight reduction. .

As shown in FIG. 1, in this embodiment, there are three energy-absorbing core layers, and the energy-absorbing cavities adjacent to the third energy-absorbing core layer are the left energy-absorbing cavity f and the right energy-absorbing cavity g, respectively; The included angle between the third faceplate of the left energy-absorbing cavity f and the fourth faceplate of the right energy-absorbing cavity g is the second dihedral angle 36 of the third energy-absorbing core layer, and the second dihedral angle of the third energy-absorbing core layer Angle 36 is less than the first dihedral angle of the third energy absorbing core layer.

The first dihedral angle of the first energy-absorbing core layer 1 is 97° or less and 93° or more, the first dihedral angle of the second energy-absorbing core layer 2 is 84° or less and 80° or more, The first dihedral angle of the third energy absorbing core layer 3 is less than or equal to 72° and greater than or equal to 68°, and the third dihedral angle 36 of the third energy absorbing core layer is less than or equal to 60° and greater than or equal to 56°. .

Preferably, the first dihedral angle 15 of the first energy absorbing core layer 1 is 95°, the first dihedral angle 25 of the second energy absorbing core layer 2 is 82°, and the third energy absorbing The first dihedral angle 35 of the core layer 3 is 70° and the second dihedral angle 36 of the third energy absorbing core layer 3 is 58°.

Each energy-absorbing core layer has a dihedral angle of 95° to 58°, and when subjected to impact, the energy-absorbing core layer can have a large collapse/shrinkage space, and the energy-absorbing core layer has sufficient strength. , so that the energy-absorbing composite layer in a unit volume can absorb more energy, which can meet the light weight requirements of automobiles, and increase the energy that can be absorbed in a unit volume, thereby improving the structure of the vehicle. More design options.

An example of an intervening layer structure, as shown in FIG. It includes a bottom plate 300 fixed and adhered to the bottom, wherein the top plate 200 and the bottom plate 300 are both made of aluminum alloy, and the thickness of the energy absorption cavity of each energy absorption core layer is 1CM. , The material used for the composite energy absorption layer is nylon, and the nylon material has high elasticity and excellent energy absorption effect.

A preferred embodiment of a method for producing an intervening layer structure, wherein the step of 3D-printing the composite energy-absorbing layer comprises constructing a three-dimensional digital model of the composite energy-absorbing layer, In this embodiment, the step S1 of constructing the energy-absorbing core layer structure using SolidWorks software, and the composite energy-absorbing layer is 3D printed based on the three-dimensional digital model of the composite energy-absorbing layer, and the fusion deposition molding technology is used. , the step S2 of fixing the processing substrate, laying the powder, and then printing the energy-absorbing core layer according to the set processing process parameters; The bottom plate 300 is adhered to the bottom of the layer, the epoxy resin is placed, the printed energy-absorbing core layer is well adhered to the contact surfaces of the top and bottom plates, and the intervening layer structure that has been manufactured after the epoxy is completely cured. and a step S3 of obtaining . The raw material of the composite energy-absorbing core layer is nylon powder particles, the crystallization temperature during 3D printing is 146 ° C., the density of the core layer is 1010 kg / m ³ , and the intervening layer structure after step S3 and perform an impact resistance test.

FIG. 5 is a force-displacement curve diagram of the intervening layer structure specimen under impact loading, as can be seen from FIG. These four impact force peaks occur in succession, respectively, the first and second face plates of the first energy-absorbing core layer 11, the first and second face plates of the second energy-absorbing layer 12, and the third energy-absorbing The force-displacement obtained in the test represents the energy absorption process when the first and second face plates of the core layer 13 and the third and fourth face plates of the third energy-absorbing core layer 13 are impacted and destroyed. The curves represent nine stages of deformation. In the first stage, since the first face plate and the second face plate of the first energy-absorbing core layer 11 undergo linear elastic deformation, the force gradually increases with the displacement. The first and second face plates begin to bend and collapse, and their displacement range is large, so the intervening layer structure specimen is greatly deformed at this stage and absorbs most of the energy, and in the third stage, the second energy absorption core The first and second face plates of the layer 12 undergo linear elastic deformation, the force gradually increases with the displacement, and in the fourth stage, the first and second face plates of the second energy-absorbing core layer 12 bend and collapse. Initially, the specimen absorbs most of the energy, in the fifth stage, the first and second face plates of the third energy-absorbing core layer 13 undergo linear elastic deformation, and in the sixth stage, the third energy-absorbing core layer 13 The first face plate and the second face plate begin to bend and collapse, the third face plate and the fourth face plate of the third energy absorption core layer 13 undergo linear elastic deformation in the seventh stage, and the third energy absorption core layer 13 undergoes linear elastic deformation in the eighth stage. The third and fourth faceplates of layer 13 begin to bend and collapse, and in the ninth stage, the energy absorption cavities of each energy absorption core layer are all collapsed, making it difficult to continue absorbing energy, so pressure rises sharply.

As can be seen from the above test results, when the impact force acts on the intervening layer structure of this example in a direction perpendicular to the energy absorbing core layer, the upper portion of the first energy absorbing core layer with the largest first dihedral angle breaks first. and then the upper part of the second energy absorbing core layer is broken, then the upper part of the third energy absorbing core layer is broken, the lower part of the third energy absorbing core layer is broken, and the broken energy absorbing core As the layers increase, the cushioning force generated by the energy-absorbing core layer gradually increases, so that the composite energy-absorbing layer of this example breaks down step by step when subjected to a large impact force. After a cross-section is randomly broken, there is no situation where the compressive strength of the entire thin-walled structure is rapidly reduced, so the intervening layer structure of this embodiment has a compact structure and a reasonable structural installation, When broken, the unit volume energy absorption layer can absorb more energy, and the energy absorption effect is excellent.

It should be noted that the above are only preferred embodiments of the present invention, and it should be pointed out that those skilled in the art can make further improvements and substitutions without departing from the technical principles of the present invention. Improvements and replacements should also be regarded as the protection scope of the present invention.

REFERENCE SIGNS LIST 100 composite energy absorbing layer 1 first energy absorbing core layer 11 energy absorbing cavity of first energy absorbing core layer 11a front energy absorbing cavity of first energy absorbing core layer 11b rear energy absorbing cavity of first energy absorbing core layer 111 first First face plate of energy absorbing core layer 111a First face plate of front energy absorbing cavity 111b First face plate of rear energy absorbing cavity 112 Second face plate of first energy absorbing core layer 112a Second face plate of front energy absorbing cavity 112b Rear energy absorbing Second faceplate of cavity 113 Third faceplate of first energy-absorbing core layer 114 Fourth faceplate of first energy-absorbing core layer 115 First dihedral angle of first energy-absorbing core layer 2 Second energy-absorbing core layer 21 Second energy absorbing cavity of energy absorbing core layer 215 first dihedral angle of second energy absorbing core layer 3 third energy absorbing core layer 31 energy absorbing cavity of third energy absorbing core layer 315 first two of third energy absorbing core layer Face angle 36 Second dihedral angle of third energy absorbing core layer a First energy absorbing cavity b Second energy absorbing cavity c Third energy absorbing cavity d Fourth energy absorbing cavity e Fifth energy absorbing cavity f Left energy absorbing cavity g right energy absorption cavity 200 intervening layer structure upper plate 300 interposing layer structure lower plate

Claims (10)

a composite energy-absorbing layer, comprising a plurality of energy-absorbing core layers arranged in order from top to bottom;
Each of the energy-absorbing core layers includes a plurality of partitioned energy-absorbing cavities, and the plurality of energy-absorbing cavities located in the middle of each of the energy-absorbing core layers are sealed, each of the plurality of energy absorbing cavities located at the edge of each of the energy absorbing core layers has an opening;
A composite energy absorbing layer, wherein the included angle of the upper portion of each energy absorbing cavity is a first dihedral angle, and the first dihedral angles of the multiple energy absorbing core layers decrease in order from top to bottom. each of the energy absorption cavities has a horizontal quadrangular prism shape,
The four sides of the horizontal quadrangular prism-shaped energy absorption cavity are a first face plate, a second face plate, a third face plate and a fourth face plate in order, the first face plate and the second face plate are located on the top, and the third face plate is located on the top. The compound energy absorption according to claim 1, characterized in that the face plate and the fourth face plate are positioned at the bottom, and the included angle between the first face plate and the second face plate is the first dihedral angle. layer. The energy absorbing cavity located in the middle is defined as a first energy absorbing cavity, the energy absorbing cavity adjacent to the first energy absorbing cavity and located above and to the left of the first energy absorbing cavity is defined as a second energy absorbing cavity, The energy absorbing cavity adjacent to the first energy absorbing cavity and located on the upper right side of the first energy absorbing cavity is defined as a third energy absorbing cavity, and adjacent to the first energy absorbing cavity and on the lower right side of the first energy absorbing cavity. a fourth energy absorbing cavity, an energy absorbing cavity adjacent to the first energy absorbing cavity and located to the lower left of the first energy absorbing cavity is a fifth energy absorbing cavity;
A first faceplate of the first energy absorption cavity and a third faceplate of the second energy absorption cavity are provided overlapping, and a second faceplate of the first energy absorption cavity and a fourth faceplate of the third energy absorption cavity are overlapped. a third faceplate of the first energy absorption cavity and a first faceplate of the fourth energy absorption cavity are provided overlapping each other; and a fourth faceplate of the first energy absorption cavity and a first faceplate of the fifth energy absorption cavity 3. The composite energy absorption layer according to claim 2, wherein the two-sided plates are provided so as to overlap each other. The energy absorbing cavities adjacent to the lowermost energy absorbing core layer are defined as a left energy absorbing cavity and a right energy absorbing cavity, respectively, and between the third face plate of the left energy absorbing cavity and the fourth face plate of the right energy absorbing cavity. 3. The composite energy absorbing layer according to claim 2, wherein the included angle is a second dihedral angle, said second dihedral angle being smaller than the first dihedral angle of said last energy absorbing core layer. The energy absorbing core layer has three layers, the dihedral angle of the first energy absorbing core layer is 97° or less and 93° or more, and the dihedral angle of the second energy absorbing core layer is 84°. or less and 80° or more, the dihedral angle of the third energy-absorbing core layer is 72° or less and 68° or more, and the second dihedral angle is 60° or less and 56° or more. 5. The composite energy absorption layer according to claim 4, characterized by: The first dihedral angle of the first energy-absorbing core layer is 95°, the first dihedral angle of the second energy-absorbing core layer is 82°, and the first dihedral angle of the third energy-absorbing core layer is 82°. 6. The composite energy absorbing layer of claim 5, wherein the dihedral angle is 70[deg.] and the second dihedral angle is 58[deg.]. An intervening layer structure comprising the composite energy absorbing layer according to any one of claims 1 to 6,
An intervening layer structure, wherein an upper plate is adhesively fixed to an upper portion of said composite energy absorbing layer, and a lower plate is adhesively fixed to a lower portion of said energy absorbing composite layer. a step S1 of constructing a three-dimensional digital model of the composite energy absorbing layer;
a step S2 of 3D printing the substance of the composite energy absorption layer based on the three-dimensional digital model of the composite energy absorption layer;
8. The intermediate layer structure of claim 7, further comprising a step S3 of adhering an upper plate (200) to the upper portion of the composite energy absorption layer and adhering a lower plate (300) to the lower portion of the composite energy absorption layer. Production method. The upper plate and the lower plate are both aluminum alloy plates,
9. The material of the composite energy absorption layer is nylon powder particles, the crystallization temperature during 3D printing is 146° C., and the density of the core layer is 1010 kg/m ³ . A method of manufacturing the described intervening layer structure. 9. The method of manufacturing an intervening layer structure according to claim 8, wherein an impact resistance test is performed on the intervening layer structure after step S3.

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