CN117246266A - Gradient lattice filling thin-wall energy absorbing device - Google Patents
Gradient lattice filling thin-wall energy absorbing device Download PDFInfo
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- CN117246266A CN117246266A CN202311216718.XA CN202311216718A CN117246266A CN 117246266 A CN117246266 A CN 117246266A CN 202311216718 A CN202311216718 A CN 202311216718A CN 117246266 A CN117246266 A CN 117246266A
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 9
- 210000004027 cell Anatomy 0.000 claims description 67
- 210000005056 cell body Anatomy 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 229910003407 AlSi10Mg Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
- B60R2019/1866—Cellular structures
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention relates to the technical field of automobile safety, and discloses a gradient lattice filling thin-wall energy absorbing device, which comprises a pipe body; the energy absorption assembly comprises a plurality of lattice layers, wherein the lattice layers are embedded in the pipe body along the axial direction, and two adjacent lattice layers are fixedly connected; the lattice layer comprises a first unit cell, a plurality of second unit cell and a plurality of third unit cell, wherein the first unit cell is positioned on the axis of the pipe body, the second unit cell and the third unit cell are identical in number, the second unit cell and the third unit cell are fixedly connected to the outer ring of the first unit cell at equal intervals along the circumferential direction, the second unit cell and the third unit cell are staggered, and the second unit cell and the third unit cell are fixedly connected and embedded into the inner wall of the pipe body. The gradient mode of the invention obtains more folds through interaction with the pipe body, thereby having excellent crashworthiness.
Description
Technical Field
The invention relates to the technical field of automobile safety, in particular to a gradient lattice filling thin-wall energy absorbing device.
Background
The automobile energy absorbing box device exists as a low-speed safety protection system, and is easy to wrinkle and deform in collision. Most of the energy-absorbing boxes are of metal thin-wall pipe structures, and the energy-absorbing boxes have the characteristics of improving the passive safety of the automobile and reducing the maintenance cost. Therefore, the high energy absorption is met, the effect of light weight can be achieved, and the aim of ensuring the safety of the automobile is always achieved.
Therefore, in order to improve the crashworthiness of the crash box, a light filler capable of improving the energy absorbing effect of the thin-walled tube structure is needed. However, conventional foams and honeycomb structures are complex to process and are less practical to use. With the explosive development of additive manufacturing technology, many complex lightweight porous lattices were fabricated. Thus, this problem can be solved by embedding a gradient lattice.
Disclosure of Invention
The invention aims to provide a gradient lattice filling thin-wall energy absorbing device so as to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a gradient lattice filling thin-wall energy absorbing device, which comprises:
a tube body;
the energy absorption assembly comprises a plurality of lattice layers, wherein the lattice layers are embedded in the pipe body along the axial direction, and two adjacent lattice layers are fixedly connected;
the lattice layer comprises a first unit cell, a plurality of second unit cell and a plurality of third unit cell, wherein the first unit cell is positioned on the axis of the pipe body, the second unit cell and the third unit cell are identical in number, the second unit cell and the third unit cell are fixedly connected to the outer ring of the first unit cell at equal intervals along the circumferential direction, the second unit cell and the third unit cell are staggered, and the second unit cell and the third unit cell are fixedly connected and embedded into the inner wall of the pipe body.
Preferably, the first unit cell, the second unit cell and the third unit cell are respectively composed of a plurality of rod bodies, and two adjacent rod bodies on the first unit cell, the second unit cell and the third unit cell are fixedly connected.
Preferably, the first unit cell and the third unit cell are located on the same axis, and two adjacent rod bodies form an I-type gradient lattice or an II-type gradient lattice along the direction from the center of the first unit cell to the axis of the pipe body.
Preferably, the lattice density expression (a) in the pipe body (1) is as follows:
where ρ is the density of the filled structure ρ max At maximum density ρ min The minimum density, the maximum density and the minimum density are constant.
Preferably, the cross section of the rod body is circular, and the radial expression (b) of the rod body in the type I gradient lattice and the type II gradient lattice is as follows:
wherein r is max Is the maximum value of the radius of the rod body, r min Is the minimum value of the radius of the rod body, L is 1/2 of the diagonal length of the trapezoid cross section, and x is any position of the edge of the dot matrix cross section;
for type I gradient lattice, when x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r max The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r min ；
For type IIGradient lattice, when x is at 2-1, i.e. x is at the edge of lattice cross section, x/l=0, r (x) =r min The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r max 。
Preferably, the pipe body is a square thin-wall pipe.
Preferably, the number of the second unit cells and the number of the third unit cells are four, the four second unit cells are respectively positioned at four corners of the square thin-wall tube, and the four third unit cells are respectively positioned at four sides of the square thin-wall tube.
Preferably, the number of the rods on the first unit cell, the second unit cell and the third unit cell is eight, and eight rods form a body-centered cubic structure
Compared with the prior art, the invention has the following advantages and technical effects:
according to the gradient lattice filling thin-wall energy absorbing device provided by the invention, a plurality of lattice layers are periodically embedded in the pipe body, so that the lattice layers and the inner wall of the pipe body are prevented from sliding relatively, and two gradient modes of a lattice are provided: including from the edge to the inside, the radius gradually decreases and gradually increases. The two gradient modes of the invention obtain more folds through interaction with the pipe body, thereby having excellent crashworthiness.
Drawings
For a clearer description of an embodiment of the invention or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:
FIG. 1 is a schematic view of a pipe body structure of the invention;
FIG. 2 is a schematic diagram of an energy absorbing assembly of the present invention;
FIG. 3 is a schematic view of the overall structure of the device of the present invention;
FIG. 4 is a schematic diagram of the structure of a unit cell according to the present invention, wherein (1) is a second unit cell, (2) is a third unit cell, and (3) is a first unit cell;
FIG. 5 is a schematic diagram showing the distribution of unit cells in a lattice layer according to the present invention;
FIG. 6 is a schematic diagram of a type I gradient structure of the present invention;
FIG. 7 is a schematic diagram of a type II gradient structure according to the present invention;
FIG. 8 is a schematic diagram of the stress variation of the device of the present invention;
wherein, 1, the tube body; 2. a first unit cell; 3. a second unit cell; 4. and a third unit cell.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Embodiment one:
referring to fig. 1-7, the present invention provides a gradient lattice filling thin-wall energy absorbing device, comprising:
a tube body 1;
the energy absorption assembly comprises a plurality of lattice layers, wherein the lattice layers are embedded in the pipe body 1 along the axial direction, and two adjacent lattice layers are fixedly connected;
the lattice layer comprises a first unit cell body 2, a plurality of second unit cell bodies 3 and a plurality of third unit cell bodies 4, wherein the first unit cell body 2 is positioned on the axis of the pipe body 1, the second unit cell bodies 3 and the third unit cell bodies 4 are consistent in quantity, the second unit cell bodies 3 and the third unit cell bodies 4 are respectively fixedly connected to the outer ring of the first unit cell body 2 at equal intervals along the circumferential direction, the second unit cell bodies 3 and the third unit cell bodies 4 are staggered, and the adjacent two second unit cell bodies 3 and the third unit cell bodies 4 are fixedly connected and respectively embedded on the inner wall of the pipe body 1.
In a further optimized scheme, the first unit cell body 2, the second unit cell body 3 and the third unit cell body 4 are respectively composed of a plurality of rod bodies, and two adjacent rod bodies on the first unit cell body 2, the second unit cell body 3 and the third unit cell body 4 are fixedly connected.
In a further optimization scheme, two adjacent rod bodies, which are positioned on the same axis, of the first unit body 2 and the third unit body 4 form an I-type gradient lattice or an II-type gradient lattice along the direction from the center of the first unit body 2 to the axis of the pipe body 1.
Further optimizing scheme, the lattice density expression (a) in the pipe body 1 is as follows:
where ρ is the density of the filled structure ρ max At maximum density ρ min The minimum density, the maximum density and the minimum density are constant.
x is the length from the lattice edge (node 2-1) to any position of the diagonal, and L is half the length of the entire diagonal.
In a further optimization scheme, the section of the rod body is circular, and the radial expression (b) of the rod body in the type I gradient lattice and the type II gradient lattice is as follows:
wherein r is max Is the maximum value of the radius of the rod body, r min Is the minimum value of the radius of the rod body, L is 1/2 of the diagonal length of the trapezoid cross section, and x is any position of the edge of the dot matrix cross section;
for type I gradient lattice, when x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r max The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r min ；
For type II gradient lattice, when x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r min The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is at the pointIn the middle of the array cross section, x/l=1, r (x) =r max 。
Referring to fig. 6, the gradient lattice of type I is shown when x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r max The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r min ；
Referring to fig. 7, a type II gradient lattice is shown, where x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r min The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r max 。
In a further optimization scheme, the pipe body 1 is a square thin-wall pipe.
In a further optimization scheme, the number of the second unit cells 3 and the number of the third unit cells 4 are four, the four second unit cells 3 are respectively positioned at four corners of the square thin-wall tube, and the four third unit cells 4 are respectively positioned at four sides of the square thin-wall tube.
Referring to fig. 2 and 3, the total number of the first unit cell bodies 2, the second unit cell bodies 3 and the third unit cell bodies 4 is 9, the 9 unit cell bodies are distributed in a nine-grid mode, four second unit cell bodies 3 are located on four corners of the nine-grid mode, four third unit cell bodies 4 are located on four sides of the nine-grid mode, the first unit cell body 2 is located at the middle position, and the combined integral structure is suitable for square thin-wall tubes.
Referring specifically to fig. 5, the first unit cell 2 is located in the right middle, the second unit cell 3 at the upper left corner and the third unit cell 4 directly above are at initial positions, and are arranged clockwise along the second unit cell 3 at the upper left corner, and are respectively the third unit cell 4, the second unit cell 3 rotated 90 ° clockwise, the third unit cell 4 rotated 90 ° clockwise, the second unit cell 3 rotated 180 ° clockwise/counterclockwise, the third unit cell 4 rotated 180 ° clockwise/counterclockwise, the second unit cell 3 rotated 90 ° counterclockwise, and the third unit cell 4 rotated 90 ° by a reverse needle. In addition, referring to fig. 6-7, the right lower corner of the cross section of the second unit cell 3 at the upper left corner is a trapezoid rod body, and the diameters of the rod bodies at the cross section of the third unit cell 4 right above are the same, so that the whole lattice layer is obtained, and meanwhile, the trapezoid structure of the lattice layer is distributed along four corners to the center part, in addition, referring to fig. 6, the diameters of the rod bodies in the direction from the outer side to the inner side of the i-type gradient lattice are gradually reduced, and in addition, referring to fig. 7, the diameters of the rod bodies in the direction from the outer side to the inner side of the ii-type gradient lattice are gradually increased.
In a further optimization scheme, the number of the plurality of rod bodies on the first unit cell body 2, the second unit cell body 3 and the third unit cell body 4 is eight, and the eight rod bodies form a body-centered cubic structure.
Referring to fig. 4, each unit cell is composed of eight rod bodies, one ends of the eight rod bodies are fixedly connected, the other ends of the eight rod bodies are distributed obliquely outwards, the whole body is formed into a body-centered cubic structure, the other ends of the rod bodies are provided with characteristic shapes, and two adjacent rod bodies between two adjacent unit cell bodies are spliced and fixedly connected through the characteristic shapes to form a whole structure.
Embodiment two:
referring to fig. 8, the material of the pipe body 1 is selected from Al-1060, and the material of the energy absorbing component is selected from AlSi10Mg alloy; the elastic modulus e1=64.8gpa, poisson ratio μ1=0.30, and initial yield strength σ1=45 MPa; alSi10Mg alloy has elastic modulus e2=62.9 GPa, poisson ratio μ2=0.30, and initial yield strength σ2=125 MPa.
The model is built in finite element software ABAQUS/Explict, the material of the pipe body 1 is Al-1060, the height is L1=120 mm, the cross-sectional dimension is a1×b1=30 mm×30mm, the material of the energy absorbing component is AlSi10Mg alloy, the height is L2=120 mm, and the cross-sectional dimension is a2×b2=30 mm×30mm. The maximum rmax and minimum radius rmin of the type I gradient are 0.54mm and 0.20mm, respectively, and the maximum rmax and minimum radius rmin of the type II gradient are 0.9mm and 0.42mm, respectively. M=3 for type i and type ii gradients, the mass of both gradient modes is the same.
Taking one lattice layer as an example, the lattice layer consists of 9 single cells, wherein the lattice layer comprises a single first single cell body 2, a single second single cell body 3 and a single third single cell body 4, the single cells at the rest positions are obtained by rotating and translating in the same way as the embodiment, and the radius of a rod piece at a node is kept consistent. The nodes covered by the black dots have the same radius at each layer, as viewed in the z-direction.
The tube body 1 of the gradient lattice filling thin-wall energy-absorbing box device is prepared by a linear cutting technology, and the gradient lattice is prepared by a laser melting technology.
Referring to fig. 8, a schematic diagram of the stress variation of the gradient lattice filling thin-wall energy-absorbing box device under different compression distances is shown.
It can be observed from the table that the test and simulation errors are within 5.00%, the total energy absorption of the I-RLT is 5.78% higher than that of the U-RLT (test), the total energy absorption of the II-RLT is 9.91% higher than that of the U-RLT (test), but the initial peak breaking force is only improved by about 2.00%, and the impact efficiency of the gradient lattice filling thin-wall energy absorption structure designed by the patent is also above 0.7. Therefore, the design of the gradient lattice can obtain lower initial peak load while increasing energy absorption.
Referring to fig. 8, it can be seen from the figure that the experimental fold starts partly from the top and partly from the bottom. The first fold occurs in a position related to the position of the initial defect of the tubular body 1 and the number of folds is related to the number of internal lattices. The more the number of lattices, the more complicated the contact with the inner wall of the pipe body 1, so that the more wrinkles are formed, the shorter the wavelength of the wrinkles, and the better the energy absorbing effect. All folds start to develop after the previous fold is formed, so that a progressive deformation mode is formed. This deformation mode is an effect of overall buckling, and is a desirable folding mode.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. The gradient lattice filling thin-wall energy absorbing device is characterized by comprising:
a tube body (1);
the energy absorption assembly comprises a plurality of lattice layers, wherein the lattice layers are axially embedded in the pipe body (1), and two adjacent lattice layers are fixedly connected;
the lattice layer comprises a first unit cell body (2), a plurality of second unit cell bodies (3) and a plurality of third unit cell bodies (4), wherein the first unit cell body (2) is positioned on the axis of the pipe body (1), the second unit cell bodies (3) and the third unit cell bodies (4) are consistent in number, the second unit cell bodies (3) and the third unit cell bodies (4) are fixedly connected with the outer ring of the first unit cell body (2) at equal intervals along the circumferential direction respectively, the second unit cell bodies (3) and the third unit cell bodies (4) are staggered, and the second unit cell bodies (3) and the third unit cell bodies (4) are fixedly connected and embedded on the inner wall of the pipe body (1) respectively.
2. The gradient lattice filling thin-wall energy absorbing device according to claim 1, wherein: the first unit cell (2), the second unit cell (3) and the third unit cell (4) are respectively composed of a plurality of rod bodies, and two adjacent rod bodies on the first unit cell (2), the second unit cell (3) and the third unit cell (4) are fixedly connected.
3. The gradient lattice filling thin-wall energy absorbing device according to claim 2, wherein: the first unit cell body (2) and the third unit cell body (4) are positioned on the same axis, and two adjacent rod bodies form an I-type gradient lattice or an II-type gradient lattice along the direction from the center of the first unit cell body (2) to the axis of the pipe body (1).
4. A gradient lattice filled thin wall energy absorber according to claim 3, wherein: the lattice density expression (a) in the pipe body (1) is as follows:
where ρ is the density of the filled structure ρ max At maximum density ρ min The minimum density, the maximum density and the minimum density are constant.
5. A gradient lattice filled thin wall energy absorber according to claim 3, wherein: the section of the rod body is circular, and the radial expression (b) of the rod body in the type I gradient lattice and the type II gradient lattice is as follows:
wherein r is max Is the maximum value of the radius of the rod body, r min Is the minimum value of the radius of the rod body, L is 1/2 of the diagonal length of the trapezoid cross section, and x is any position of the edge of the dot matrix cross section;
for type I gradient lattice, when x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r max The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r min ；
For type II gradient lattice, when x is at 2-1, i.e., x is at the edge of the lattice cross-section, x/l=0, r (x) =r min The method comprises the steps of carrying out a first treatment on the surface of the When x is at 2-4, i.e. x is in the middle of the lattice cross-section, x/l=1, r (x) =r max 。
6. The gradient lattice filling thin-wall energy absorbing device according to claim 5, wherein: the pipe body (1) is a square thin-wall pipe.
7. The gradient lattice filling thin-wall energy absorbing device of claim 6, wherein: the number of the second unit cells (3) and the number of the third unit cells (4) are four, the four second unit cells (3) are respectively positioned at four corners of the square thin-wall tube, and the four third unit cells (4) are respectively positioned at four sides of the square thin-wall tube.
8. The gradient lattice filling thin-wall energy absorbing device of claim 7, wherein: the number of the rod bodies on the first unit cell body (2), the second unit cell body (3) and the third unit cell body (4) is eight, and the eight rod bodies form a body-centered cubic structure.
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| CN202311216718.XA CN117246266A (en) | 2023-09-20 | 2023-09-20 | Gradient lattice filling thin-wall energy absorbing device |
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| CN202311216718.XA CN117246266A (en) | 2023-09-20 | 2023-09-20 | Gradient lattice filling thin-wall energy absorbing device |
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