CN108099829B - Functional gradient multi-cell thin-wall tube - Google Patents
Functional gradient multi-cell thin-wall tube Download PDFInfo
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- CN108099829B CN108099829B CN201810126409.6A CN201810126409A CN108099829B CN 108099829 B CN108099829 B CN 108099829B CN 201810126409 A CN201810126409 A CN 201810126409A CN 108099829 B CN108099829 B CN 108099829B
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- 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
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- 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
- B60R19/22—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 containing mainly cellular material, e.g. solid foam
Abstract
A functional gradient multi-cell thin-wall pipe comprises a thin-wall pipe body, wherein the thin-wall pipe body is of a hollow structure formed by at least one plate III; the hollow structure comprises a cell area or a plurality of cell areas equally divided by a second structural member formed by two plates, the cell area is internally provided with a first structural member formed by two plates which are arranged in a shape of a Chinese character 'mi', and the thickness of each plate increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation; according to the invention, plates of different materials or uniform materials can be designed into different thicknesses according to actual needs to realize gradient characteristics, and the first plate, the second plate and the third plate can be independently set into the same functional relation gradient change or different functional relation gradient changes according to actual needs; the structure of the invention has the same mechanical property in each area during collision, can absorb impact kinetic energy through plastic deformation to reduce damage degree, has the characteristics of high energy absorption efficiency, strong impact resistance and low cost, and can realize light weight.
Description
Technical Field
The invention belongs to the field of design of automobile collision safety structures, and particularly relates to a functional gradient multi-cell thin-wall tube, in particular to a functional gradient multi-cell thin-wall tube which enables materials to be subjected to progressive telescoping deformation through a progressive buckling action mode of a tube wall.
Background
The thin-wall structure is the most important anti-collision safety protection component of vehicles such as automobiles. In the collision process of the automobile, the thin-wall structure is stressed, collapses and absorbs energy, so that the damage of the collision accident to the automobile body and the damage of passengers are reduced. Under the action of different collision angles, the thin-wall structure is easy to deform and unstable. In order to improve the collision safety performance of automobiles and the utilization rate of materials, the quality of a thin-wall structure is reduced, and the optimization of the cross-section design of the thin-wall structure is critical.
The traditional thin-wall structure has the defects of unstable deformation mode, low energy absorption efficiency and the like. Because the compressive property of steel is good and the ductility of the material is strong, most materials with thin wall structures adopt high-strength steel. The functional gradient multi-cell thin-wall structure has obvious advantages in the aspects of high-efficiency energy absorption, peak force reduction and the like. Therefore, the functionally graded multi-cell thin-wall structure is favored by the automobile industry.
Patent document 1: CN 202641871U discloses a diaphragm reinforced thin-wall energy absorbing tube, which is suitable for various explosion and impact energy absorbing structures, and comprises a thin-wall tube, wherein at least one diaphragm is arranged in the thin-wall tube, is perpendicular to the wall of the thin-wall tube, and is fixedly connected with the wall of the thin-wall tube. The thin-wall energy absorption tube provided by the patent document improves the energy absorption efficiency by arranging the diaphragm plate in the tube, but the energy absorption effect under the collision condition is poor because the thickness of the whole tube wall is uniformly distributed.
Patent document 2: CN 102700488B discloses a buffering and energy absorbing structure, which comprises a hollow metal thin-wall structure, wherein the hollow thin-wall structure is filled with a light metal foam material or a metal honeycomb material, and the hollow metal thin-wall structure and the filled light metal porous material are fixedly connected together through bonding or brazing to form a complete buffering and energy absorbing structure; the density of the filled metal foam material in the longitudinal direction changes in a gradient, and the pore size of the filled metal honeycomb material in the longitudinal direction or the wall thickness of the honeycomb changes in a gradient. The cushioning energy absorbing thin wall structure disclosed in this patent document is also configured to be graded, but is realized by configuring the density of the metal foam material or the pore size or wall thickness of the metal honeycomb material to be graded. According to the patent document, the metal foam material or the honeycomb material is filled in the thin-wall structure, the wall thickness of the honeycomb material is set to be in gradient change, the foam material or the honeycomb material belongs to a new material, the cost is high, the structure of the foam material or the honeycomb material is also fixed, and the application working condition is limited.
The invention aims to provide the functional gradient multi-cell thin-wall tube which has low production cost and various structures, and the thickness of the outer thin-wall and the thickness of the inner structural part can be selected variously according to actual needs.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the functional gradient multi-cell thin-wall tube, which enables the material to gradually shrink and deform through the gradual buckling action mode of the tube wall, so that the energy absorption efficiency of the tube can be improved, and the tube has the characteristics of high crashworthiness, strong stability in collision and light weight.
In order to solve the technical problems, the invention adopts the following technical scheme:
the functional gradient multicellular thin-wall pipe comprises a thin-wall pipe body, wherein the thin-wall pipe body is of a hollow structure formed by at least one plate III;
scheme one: the hollow structure comprises a cell area, the cell area comprises a plurality of cell tubular structures which are evenly separated by a first structural member, and the first structural member consists of a first plate arranged in a shape of a Chinese character 'mi';
the first structural member is equally divided by a plurality of parts arranged along the longitudinal length thereofA first structural element of the segment>The first structural member units are fixedly connected in sequence, and the thickness of a first plate forming the first structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the thin-wall pipe body is equally divided by a plurality of parts which are arranged along the longitudinal length of the thin-wall pipe bodyThe main body unit of the section tube is composed of->The section pipe body units are fixedly connected in sequence, and the thickness of a plate III forming the pipe body unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the lengths of the thin-wall pipe body and the first structural part are L.
Further, the method comprises the steps of,
in a first aspect, the hollow structure is circular or square.
Scheme II: the hollow structure is square, the hollow structure comprises two or more cell areas which are evenly divided by a second structural member formed by a second plate, each cell area comprises a plurality of cell tubular structures which are evenly divided by a first structural member, and the first structural member is formed by a first plate which is arranged in a shape of a Chinese character 'Mi';
the first structural member is equally divided by a plurality of parts arranged along the longitudinal length thereofA first structural element of the segment>The first structural member units are fixedly connected in sequence, and the thickness of a first plate forming the first structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the second structural member is equally divided and arranged along the longitudinal length of the second structural memberA second structural element of the segment>The second structural member units are fixedly connected in sequence, and the thickness of the second plate forming the second structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the thin-wall pipe body is equally divided by a plurality of parts which are arranged along the longitudinal length of the thin-wall pipe bodyThe main body unit of the section tube is composed of->The segment pipe body units are fixedly connected in sequence to form a pipeThe thickness of the third plate of the body unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the lengths of the thin-wall pipe body, the first structural member and the second structural member are L.
Further, in scheme two:
the second plate of the second structural member is arranged in a shape of a Chinese character 'Yi' or a Chinese character 'Shi' or a Chinese character 'jing', or the second structural member is composed of more than two horizontal plate members arranged horizontally in parallel and at least one vertical plate member which is arranged perpendicular to the horizontal plate members and equally divides the horizontal plates.
Further, in the two schemes described above,
the symmetry centers of the first plates which are longitudinally and correspondingly arranged on the sections are all on the same axis.
Further, in the two schemes described above,
the symmetry centers of the plates III longitudinally and correspondingly arranged on the sections are all on the same axis.
Further, in the second scheme, the first scheme,
the symmetry centers of the second plates which are longitudinally and correspondingly arranged on the sections are all on the same axis.
Preferably, the method comprises the steps of,
the functional relation is as follows:；
wherein:represents->Segment plate (plate one or plate two or plate three)Is a thickness of (2); />；/>The thickness of the plate (plate one or plate two or plate three) representing the collision head end; />Is an increasing gradient of the thickness of the plate (plate one or plate two or plate three).
Preferably, the method comprises the steps of,
the functional relation is as follows:
；
in (a):represents->The thickness of the section plate (plate one, plate two or plate three); />；/>Is->The length of the central line of the longitudinal length of the section plate (plate one, plate two or plate three) from the upper end of the thin-wall pipe is +.>Is the length of the thin-wall pipe body; />The thickness (minimum thickness) of the plate member for the collision head end; />The thickness (maximum thickness) of the plate member which is the fixed end; />；/>Is gradient index>。
Further, the method comprises the steps of,
the first structural member is fixedly connected with the thin-wall pipe body through welding.
Further, the method comprises the steps of,
the second structural member is fixedly connected with the thin-wall pipe body through welding.
Further, the method comprises the steps of,
the first structural member and the second structural member are fixedly connected through welding.
Preferably, the method comprises the steps of,
the first plates of the sections which are longitudinally and correspondingly arranged are fixedly connected through laser welding.
Preferably, the method comprises the steps of,
the second plates which are longitudinally and correspondingly arranged are fixedly connected through laser welding.
Preferably, the method comprises the steps of,
and the third plates longitudinally and correspondingly arranged in the sections are fixedly connected through laser welding.
Further, the method comprises the steps of,
the joint adopts high-strength steel laser for splicing, so that the quality of the integral thin-wall structure is reduced, and the light weight is realized.
Preferably, the method comprises the steps of,
the thickness of the collision head end is 0.35-3.0mm;
the length of the thin-wall pipe body (or the first structural member or the second structural member) is 150-300mm;
the side length of the central section of the thin-wall pipe body is 50-80mm.
The invention has the following beneficial effects:
1. the multi-cell thin-wall tube comprises a cell area or a plurality of cell areas which are equally divided, and the cell areas are internally provided with the m-shaped structural members, so that each area has the same mechanical property during collision, and when the multi-cell thin-wall tube is impacted by non-axial force, the structure absorbs impact kinetic energy through plastic deformation, and the damage degree is reduced.
2. The thickness of the plate of the multi-cell thin-wall pipe is set to be in gradient change, so that the multi-cell thin-wall pipe can generate a progressive deformation mode in a larger load angle range, and the bearing capacity of the multi-cell thin-wall pipe against a bending deformation mode in a higher load angle is further improved; by changing the thickness attribute gradient, the crashworthiness of the thin-wall structure can be greatly improved, and the structure is well balanced in the aspects of light weight, crashworthiness and the like, so that the energy-absorbing structure is an ideal energy-absorbing structure.
3. According to the invention, the first plate, the second plate and the third plate are designed to have different thicknesses by adopting different materials (such as high-strength steel and low-strength steel) according to actual needs, or the gradient characteristic is realized by adopting the same material to design to have different thicknesses. In addition, the gradient change functional relations among the first plate, the second plate and the third plate can be independently set to be the same functional relation gradient change or different functional relation gradient change according to actual needs. The gradient characteristics allow engineers to customize particular body components based on performance characteristics and requirements of different typical structures.
4. The functional gradient multi-cell thin-wall tube provided by the invention is arranged into different sections (layers) according to specific requirements, so that the energy absorption is facilitated; the thickness of different sections is gradually increased in a linear gradient, and the method for gradually increasing the thickness of the thin wall can meet the strength design requirement and can induce the gradual collapse and deformation of the structure.
5. The plates longitudinally and correspondingly arranged at different sections adopt a mode of non-single thickness, so that the energy absorption efficiency of the thin-wall pipe can be improved, materials can be saved, and the light weight is realized.
6. The symmetrical centers of all the plates (the first plate or the second plate or the third plate) forming the structural member are on the same axis, so that the Euler deformation of the material is not easy to occur.
7. The invention can avoid or delay the occurrence of larger collision peak force and avoid the phenomenon of unstable energy absorption caused by the prior deformation of the middle and lower positions.
8. The thickness between different sections of the invention is changed in a gradient function formula, and the invention can be used in a thin-wall structure of side collision, improves the structural load efficiency CFE and reduces the average collision force。
9. The thin-wall pipe is composed of a multi-cell tubular structure, can adapt to multi-working-condition inclined angles, and has enhanced impact resistance.
10. Compared with the energy absorption effect of the traditional buffering energy absorption structure under the same collision speed of the rigid wall with the same mass, the invention has better energy absorption effect.
11. The present invention has the following advantages over patent document 2: the thin-wall pipe is composed of a plurality of plates, the structure composed of the plates is more changeable than the inherent structure of new materials such as honeycomb materials, and the functional relationship of the material, thickness and gradient change of various plates (plate one, plate two and plate three) can be independently set, so that the thin-wall pipe can adapt to more working conditions and has better effect on collision at different angles; the invention can adopt the traditional steel plate to realize gradient change, and has lower cost and stronger practicability compared with new materials such as honeycomb materials in patent document 2.
When the invention is produced, the die forming technology with different thicknesses can be adopted, the plates are welded and fixed in sequence according to the sequence from small thickness to large thickness, when the invention is assembled, the plates can be firstly enclosed into a hollow structure, then the plates are embedded in the hollow structure in two phases to divide the hollow structure into a plurality of cell areas, and then the plates are assembled into a second structural member in a shape of a Chinese character 'mi', and the second structural member is embedded in each cell area.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art 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 may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a functional gradient multi-cell thin-walled tube according to an embodiment of the present invention;
FIG. 2 is a schematic view of section A-A of FIG. 1;
FIG. 3a is a schematic cross-sectional view of a conventional thin-walled tube;
FIG. 3b is a schematic cross-sectional view of a functionally graded multi-cell thin-walled tube according to an embodiment of the present invention;
FIG. 4 is a graph comparing energy absorption curves of a functionally graded multi-cell thin-walled tube according to an embodiment of the present invention with that of a conventional thin-walled tube;
FIG. 5 is a graph showing the comparison of collision force-time curves of a functionally graded multi-cell thin-walled tube according to an embodiment of the present invention and a conventional thin-walled tube.
Detailed Description
The invention is further described below with reference to examples and figures, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1-5, this embodiment provides a functionally graded multi-cell thin-wall square tube, which includes a thin-wall tube body, the thin-wall tube body is a square hollow structure surrounded by four plates three 101, the hollow structure includes four cell areas equally divided by a second structural member composed of a transverse plate two 201 and a vertical plate two 202 arranged in a cross shape, each cell area includes eight cell tubular structures equally divided by a first structural member composed of eight plates one (301, 302, 303, 304, 305, 306, 307, 308) arranged in a m shape, and the cross section of the cell tubular structures is triangular. The structure is arranged so that each area has the same mechanical property in collision, and when the structure is impacted by non-axial force, the structure absorbs the impact kinetic energy through plastic deformation, so that the damage degree is reduced.
The first structural member consists of 6 equally divided first structural member units arranged along the longitudinal length of the first structural member, and the 6 first structural member units are fixedly connected in sequence to form the thickness of a first plate (the thickness of the first plates 301-308 is equal); the thickness of the first plate forming the first structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the second structural member is composed of 6 equally divided second structural member units which are also arranged along the longitudinal length of the second structural member, the 6 second structural member units are fixedly connected in sequence, and the thickness of a second plate (the thickness of the second plate 201 and the thickness of the second plate 202 are equal) forming the second structural member unit are gradually increased from the collision head end of the thin-wall pipe to the fixed end in a functional relation; the second structural member in this embodiment is composed of two plates 201, 202 arranged in a cross shape.
The thin-wall pipe body also comprises 6 equally-divided pipe body units which are arranged along the longitudinal length of the thin-wall pipe body, the 6 pipe body units are fixedly connected in sequence, and the thickness of the four plates III 101 forming the pipe body unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the length of the thin-wall pipe body is set asThe lengths of the first structural member and the second structural member are respectively +.>、/>，。
The symmetry centers of the first plates which are longitudinally and correspondingly arranged in the 6 sections are all on the same axis, so that the material is not easy to produce Euler deformation. Namely: the first plate 301 is divided into 6 sections in the longitudinal direction, the thicknesses of the sections 1 to 6 are increased in a functional relation, and the symmetry center of each section is on the same axis; the first plate 302-308 is also divided equally into 6 sections in the longitudinal direction, with the thickness increasing as a function of the sections 1 to 6, and the centers of symmetry of each section being on the same axis.
The symmetry centers of the plates II which are longitudinally and correspondingly arranged in the 6 sections are all on the same axis, so that the material is not easy to produce Euler deformation. Namely: the second transverse plate 201 is divided into 6 sections in the longitudinal direction, the thicknesses of the sections 1 to 6 are increased in a functional relation, and the symmetry center of each section is on the same axis; the second vertical plate 202 is also divided into 6 sections equally in the longitudinal direction, the thicknesses of the sections 1 to 6 increase as a function, and the symmetry center of each section is on the same axis.
The symmetry centers of the three plates which are longitudinally and correspondingly arranged in 6 sections are all on the same axis, so that the material is not easy to produce Euler deformation. Namely: the four plates, three 101, are divided equally into 6 sections in the longitudinal direction, the thickness increases as a function of the thickness from section 1 to section 6, and the centre of symmetry of each section is on the same axis.
In the embodiment, the first plate, the second plate and the third plate are made of the same material (such as high-strength steel and low-strength steel) and are designed into different thicknesses to realize gradient characteristics. And the gradient change function relationship is set according to the following formula:
；
wherein:represents->The thickness of the section plate (plate one, plate two or plate three); />；/>The thickness of the plate (plate one or plate two or plate three) representing the collision head end; />Is an increasing gradient of the thickness of the plate (plate one or plate two or plate three).
The first structural part is fixedly connected with the thin-wall pipe body through welding; the second structural part is fixedly connected with the thin-wall pipe body through welding; the first structural member and the second structural member are fixedly connected through welding; the first plates of the 6 sections which are longitudinally and correspondingly arranged are fixedly connected through laser welding; the second plates of the 6 sections which are longitudinally and correspondingly arranged are fixedly connected through laser welding; the third plates which are longitudinally and correspondingly arranged are fixedly connected through laser welding; the joint adopts high-strength steel laser for splicing, so that the quality of the integral thin-wall structure is reduced, and the light weight is realized.
As shown in fig. 2, the axial thickness of the plates is unevenly and progressively distributed, and the centers of symmetry of the different sections of each plate longitudinally corresponding are on the same axis. From the safety aspect, the strength is set to be gradually increased layer by layer, the thicknesses T1, T2, T3, T4, T5 and T6 are in linear increasing relation, and the yield strength is also increased, so that the material is progressively deformed in a telescoping way, and energy is fully absorbed.
The multi-cell thin-wall square tube provided by the embodiment is built into hypermesh software, the length L of the structure is 300mm, the thickness of each plate correspondingly arranged longitudinally changes in a gradient manner, and the symmetrical centers of different sections of each plate are positioned on the same axis. Six thicknesses are arranged in the axial direction of the structure to form thickness gradients, each plate (plate three 101, plate two 201-202 and plate one 301-308) has corresponding T1, T2, T3, T4, T5 and T6 which are sequentially increased, in this embodiment, for better simulation, the corresponding T1, T2, T3, T4, T5 and T6 of the plate three 101, plate two 201-202 and plate one 301-308 are set to be identical, and the corresponding thicknesses are 0.4, 0.52, 0.64, 0.76, 0.88 and 1.0mm, and as the gradient change of each plate is not large, the corresponding thicknesses B1 and B2 are set to be equal for operation in simulation, and the specific dimension B1=B2=80 mm.
Further, in order to verify that the functional gradient thin-wall multi-cell square tube provided by the embodiment has better crashworthiness than the traditional gradient-free thin-wall tube, the following steps are realized:
step 1: as shown in FIG. 4, the finite element simulation result of the functional gradient thin-wall multi-cell square tube and the traditional thin-wall structure of the embodiment emphasizes that the thin-wall structure is extruded by the same material and the same rigidity with the same mass at the same speed, and the axial pressure feedback process of the thin-wall tube structure is that the initial end of the collision is deformed first, and the simulation proves that: the gradient-change thin-wall pipe structure increases gradually from the collision head end to the fixed end in a functional relation, so that compared with the traditional thin-wall pipe without the thickness gradient change, the gradient-change thin-wall pipe structure is easier to gradually fold and deform in the collision process, the gradient-change thin-wall pipe structure is favorable for fully absorbing energy, the traditional single-thickness multi-cell thin-wall structure is wholly collapsed and deformed, and the energy absorption in the collision process is insufficient.
Step 2: compressive load peak force P of functional gradient thin-wall multi-cell square tube and traditional thin-wall structure max Average compression load P m Compression amount h, absorption internal energy E int Compression force efficiency CFE versus data are shown in the following table:
from the data in the above table the following conclusions can be drawn: the average peak force of the gradient thin-wall energy-absorbing structure is larger than that of the traditional thin-wall energy-absorbing structure, which shows that the whole collision process of the structure is better than that of the traditional structure, the collision peak force of the structure is smaller than that of the traditional structure, the structure is safer, the internal energy absorbed by the whole collision process is larger than that absorbed by the traditional structure, the collision compression force efficiency of the structure is far larger than that of the traditional structure, and in a word, the structure is superior to the collision resistance of the traditional structure from data.
In summary, compared with the traditional buffering energy-absorbing structure, the functional gradient multi-cell thin-wall pipe structure has better energy-absorbing effect under the condition that the rigid walls with the same mass collide with each other at the same collision speed. The thin-wall pipe is composed of a multi-cell tubular structure, can adapt to multi-working-condition inclined angles, and has enhanced impact resistance; by adopting a mode of non-single thickness, the energy absorption efficiency of the thin-wall pipe can be improved, materials can be saved, and light weight is realized.
As other preferred embodiments, the plate member of the second structural member may be a transverse plate arranged in a "one" shape to divide the hollow structure equally into two cell areas, each cell area being divided equally into 8 triangular cell tubular structures by the first structural member arranged in a "m" shape;
or the second structural member is a vertical plate which is arranged in an 'I' shape, the hollow structure is uniformly divided into two cell areas, and each cell area is uniformly divided into 8 triangular cell tubular structures by the first structural member which is arranged in a'm' -shape;
or the second structural member is formed by two transverse plates and two vertical plates which are arranged in a 'well' -shaped manner, the hollow structure is equally divided into 9 cell areas, and each cell area is equally divided into 8 triangular cell tubular structures by the first structural member which is arranged in a 'rice' -shaped manner;
or the second structural member consists of more than two horizontal parallel transverse plates and at least one vertical plate which is perpendicular to the transverse plates and equally divides the transverse plates.
As other preferred embodiments, the thickness increment function relationship may be changed according to actual needs, such as a logarithmic function relationship:
；
wherein:represents->The thickness of the section plate (plate one, plate two or plate three); />；/>Is->The length of the central line of the longitudinal length of the section plate (plate one, plate two or plate three) from the upper end of the thin-wall pipe is +.>Is the length of the thin-wall pipe body; />The thickness (minimum thickness) of the plate member for the collision head end; />The thickness (maximum thickness) of the plate member which is the fixed end; />；/>Is gradient index>。
The thicknesses of the first plate, the second plate and the third plate can also be set to different gradient functional relations.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A functional gradient multi-cell thin-wall tube is characterized in that,
the pipe comprises a thin-wall pipe body, wherein the thin-wall pipe body is of a hollow structure formed by at least one plate III;
the hollow structure comprises a cell area, the cell area comprises a plurality of cell tubular structures which are evenly separated by a first structural member, and the first structural member consists of a first plate arranged in a shape of a Chinese character 'mi';
the first structural member is equally divided by a plurality of parts arranged along the longitudinal length thereofA first structural element of the segment>The first structural member units are fixedly connected in sequence, and the thickness of a first plate forming the first structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the thin-wall pipe body is equally divided by a plurality of parts which are arranged along the longitudinal length of the thin-wall pipe bodyThe main body unit of the section tube is composed of->The section pipe body units are fixedly connected in sequence, and the thickness of a plate III forming the pipe body unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the lengths of the thin-wall pipe body and the first structural part are L;
the functional relation is as follows:；
wherein:represents->The thickness of the segment plate; />；/>A thickness of the plate representing the head end of the collision; />Is an increasing gradient of the thickness of the plate, and the plate is a plate one or a plate three.
2. A functionally graded multi-cell thin-walled tube according to claim 1, wherein,
the hollow structure is round or square.
3. A functionally graded multi-cell thin-walled tube according to claim 1, wherein,
the hollow structure is square, the hollow structure comprises two or more cell areas which are evenly divided by a second structural member formed by a second plate, each cell area comprises a plurality of cell tubular structures which are evenly divided by a first structural member, and the first structural member is formed by a first plate which is arranged in a shape of a Chinese character 'Mi';
the first structural member is equally divided by a plurality of parts arranged along the longitudinal length thereofA first structural element of the segment>The first structural member units are fixedly connected in sequence, and the thickness of a first plate forming the first structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the second structural member is equally divided and arranged along the longitudinal length of the second structural memberA second structural element of the segment>The second structural member units are fixedly connected in sequence, and the thickness of the second plate forming the second structural member unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the thin-wall pipe body is equally divided by a plurality of parts which are arranged along the longitudinal length of the thin-wall pipe bodyThe main body unit of the section tube is composed of->The section pipe body units are fixedly connected in sequence, and the thickness of a plate III forming the pipe body unit increases gradually from the collision head end to the fixed end of the thin-wall pipe in a functional relation;
the lengths of the thin-wall pipe body, the first structural member and the second structural member are L;
the functional relation is as follows:；
wherein:represents->The thickness of the segment plate; />；/>A thickness of the plate representing the head end of the collision; />Is an increasing gradient of the thickness of the plate, and the plate is a first plate, a second plate or a third plate.
4. A functionally graded multi-cell thin-walled tube according to claim 3,
the second plate of the second structural member is arranged in a shape of a Chinese character 'Yi' or a Chinese character 'Shi' or a Chinese character 'jing', or the second structural member is composed of more than two horizontal plate members arranged horizontally in parallel and at least one vertical plate member which is arranged perpendicular to the horizontal plate members and equally divides the horizontal plates.
5. A functionally graded multi-cell thin-walled tube according to any of the claims 1-4,
the symmetry centers of the first plates which are longitudinally and correspondingly arranged on the sections are all on the same axis;
the symmetry centers of the plates III longitudinally and correspondingly arranged on the sections are all on the same axis.
6. A functionally graded multi-cell thin-walled tube according to claim 3 or 4,
the symmetry centers of the second plates which are longitudinally and correspondingly arranged on the sections are all on the same axis.
7. A functionally graded multi-cell thin-walled tube according to claim 3 or 4,
the functional relation is as follows:；
wherein:represents->The thickness of the segment plate; />；/>Is->Longitudinal length of the segment plate, length of the central line from the upper end of the thin-walled tube, +.>Is the length of the thin-wall pipe body; />The thickness of the plate piece at the head end of the collision; />The thickness of the plate which is the fixed end; />；/>Is gradient index>The method comprises the steps of carrying out a first treatment on the surface of the The plate is a first plate, a second plate or a third plate.
8. A functionally graded multi-cell thin-walled tube according to claim 1 or 2, characterized in that,
the functional relation is as follows:；
wherein:represents->The thickness of the segment plate; />；/>Is->Longitudinal length of the segment plate, length of the central line from the upper end of the thin-walled tube, +.>Is the length of the thin-wall pipe body; />The thickness of the plate piece at the head end of the collision; />The thickness of the plate which is the fixed end; />；/>Is gradient index>The method comprises the steps of carrying out a first treatment on the surface of the The plate is a plate one or a plate three.
9. A functionally graded multi-cell thin-walled tube according to claim 3 or 4,
the first structural part is fixedly connected with the thin-wall pipe body through welding;
the second structural part is fixedly connected with the thin-wall pipe body through welding;
the first structural member and the second structural member are fixedly connected through welding.
10. A functionally graded multi-cell thin-walled tube according to claim 3 or 4,
the first plates which are longitudinally and correspondingly arranged are fixedly connected through laser welding;
the second plates which are longitudinally and correspondingly arranged are fixedly connected through laser welding;
and the third plates longitudinally and correspondingly arranged in the sections are fixedly connected through laser welding.
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| JP7024878B2 (en) * | 2018-09-07 | 2022-02-24 | 日本製鉄株式会社 | Automotive structural members |
| CN109263789B (en) * | 2018-09-14 | 2020-06-02 | 上海交通大学 | Ligature bridge based on functional gradient thin-walled tube |
| CN113978403A (en) * | 2021-11-17 | 2022-01-28 | 一汽解放汽车有限公司 | Collision protection assembly and commercial vehicle |
| CN114934965A (en) * | 2022-04-27 | 2022-08-23 | 梧州学院 | Multi-cell energy absorption structure with double gradient levels |
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