CN107600012A - A kind of automotive front end endergonic structure based on customizing functions - Google Patents
A kind of automotive front end endergonic structure based on customizing functions Download PDFInfo
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- CN107600012A CN107600012A CN201710851149.4A CN201710851149A CN107600012A CN 107600012 A CN107600012 A CN 107600012A CN 201710851149 A CN201710851149 A CN 201710851149A CN 107600012 A CN107600012 A CN 107600012A
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Abstract
The invention discloses a kind of automotive front end endergonic structure based on customizing functions, including anticollision girder construction, front longitudinal front segment structure and connecting board structure, anticollision girder construction includes collision prevention girders inner and outer plates and double-head arrow type negative poisson's ratio structure, Varying-thickness front longitudinal front segment structure, which includes front longitudinal inner and outer plates, front longitudinal inner and outer plates positioning hole, induction groove and flange, connecting board structure, includes collision prevention girders outside plate connecting plate and collision prevention girders, front longitudinal connecting plate；Front longitudinal front segment structure includes 3 functional areas, and the corresponding equal thickness area in each functional areas, two neighboring functional areas realize that continuous transition connects by thickness transitions area.Using the automobile of structure of the present invention in low speed collision, anticollision girder construction has very high bending resistance and flexural deformation energy absorption ability；In high velocity impact, front longitudinal front segment structure, which is used to induce, produces gradual folding conquassation deformation, improves the axial collapse energy-absorption ability and average impact of front longitudinal front segment structure, the present invention realizes the lightweight of front longitudinal simultaneously.
Description
Technical field
The present invention relates to vehicle passive safety field of structural design, more particularly to a kind of automotive front end based on customizing functions
Endergonic structure.
Background technology
Automotive front end endergonic structure mainly includes anticollision girder construction and front longitudinal front segment structure, and it is vehicle head-on crash work
Very important energy absorbing component and force transferring structure in condition.Mainly carrying bending carries anticollision girder construction under low-speed head-on collision operating mode
Lotus, protect other critical pieces of vehicle；Front rail structure mainly carries axial impact loading under high velocity impact operating mode, absorbs
Collision energy, transmit impact force.Therefore, the Impact Resisting Capability of automotive front end endergonic structure determines complete automobile collision to a certain extent
The quality of dynamic response and the size of crew module's intrusion volume, it is the key factor for influenceing automotive SBC energy.
Before the crash-worthiness design of automotive front end endergonic structure mainly includes crash-worthiness design and the front longitudinal of anticollision girder construction
The crash-worthiness of segment structure designs two kinds of approach.For the crash-worthiness design problem of anticollision girder construction, Chinese patent
201611084648.7 disclose a kind of front anticollision beam of automobile, and the collision prevention girders structural section shape uses " B " shaped sections, although
The intensity and bending rigidity of collision prevention girders are improved to a certain extent, but the shortcomings that collision energy-absorbing efficiency is low still be present；In
State's patent 201620121549.0 discloses a kind of foamed aluminium automobile buffer beam, and the collision prevention girders are made by using foam constructed of aluminium
For internal interstitital texture, the collision energy-absorbing of anticollision girder construction is improved to a certain extent, and ensure that the lightweight of automobile
Design requirement, but the bending stiffness of the anticollision girder construction can gradually reduce with the increase of flexural deformation, so as to cause to touch
Hit the decrease of energy absorption ability；For the crash-worthiness design problem of front rail structure, Chinese patent 200820238454.2 discloses
A kind of segmented laser assembly solder automobile front longitudinal beam, including longitudinal beam front section, longeron stage casing and longeron back segment, three's thickness are passed successively
Increasing, this front rail structure realizes light-weight design on the premise of collision safety performance is met, but due to laser assembly solder
There is abrupt changes in thickness in the position while welding of plate, springback Prediction, mold design and the manufacture of laser assembly solder plate can be caused difficult.For gram
The deficiency of laser assembly solder construction joint position performance mutation is taken, Chinese patent 201310523023.6 discloses a kind of continuous become and cut
Face automobile front longitudinal beam and preparation method thereof, the front longitudinal include vertical front-axle beam leading portion and front longitudinal back segment, the thickness of the two and passed successively
Increase, and the thickness consecutive variations of front longitudinal transition region are realized using laser welding, spot-welding technology and technique for sticking.However, before this
Longitudinal beam structure does not carry out equitable subsection division, and the thickness of front rail structure according to the general arrangement boundary condition of automobile front chamber
In trend incremented by successively, may result in be delivered under high velocity impact operating mode crew module impact force is excessive, acceleration peak value
The problems such as higher and fire wall intrusion volume is excessive, is unfavorable for occupant safety.
Although above-mentioned automobile buffer beam and front rail structure realize lightweight and crash-worthiness design to a certain extent,
To still have that collision energy-absorbing efficiency is low in the crash-worthiness design aspect of anticollision girder construction, and collision prevention girders bending stiffness with
The increase of flexural deformation and the problem of gradually weaken；In the crash-worthiness design aspect of front rail structure, fail to make full use of collision
The deformation space in conquassation area, collision energy-absorbing efficiency is low, and can cause to be delivered to during collision crew module power is excessive, acceleration peak
It is worth the problems such as higher, is unfavorable for the safeguard protection of occupant.
The content of the invention
To solve the above problems, the present invention utilizes the variation rigidity characteristic of double-head arrow type negative poisson's ratio structure, and continuous change
Thickness flexible rolling technology, a kind of innovative automotive front end endergonic structure based on customizing functions of proposition are main to include filling
The anticollision girder construction and Varying-thickness front longitudinal front segment structure of double-head arrow type negative poisson's ratio structure.It is intended to improve the bending resistance energy of collision prevention girders
Power and flexural deformation energy absorption ability, and the deformation space in front longitudinal collision conquassation area is made full use of, farthest absorb collision
Energy, realize to collision prevention girders and the maximized lightweight of front longitudinal and crash-worthiness design.
The technical scheme is that：
A kind of automotive front end endergonic structure based on customizing functions, including section are in the anticollision girder construction of concave character type, section
For the front longitudinal front segment structure and connecting board structure of single shape for hat, the anticollision girder construction includes collision prevention girders outside plate, double-head arrow type is born
Poisson's ratio structure and collision prevention girders inner panel, the collision prevention girders outside plate and collision prevention girders inner panel form a closing chamber by solder joint technique
Body, closed cavity inside filling double-head arrow type negative poisson's ratio structure；The Varying-thickness front longitudinal front segment structure is included in front longitudinal
Plate and girder plate, front longitudinal girder inner plate and the front longitudinal outside plate carry out assembly connection, and shape at flange by spot-welding technology
Into the cavity of a closing, the front longitudinal girder inner plate is provided with two and laterally induces grooves and a front longitudinal girder inner plate positioning holes, two
Laterally groove is parallel is distributed in functional area A for induction, and front longitudinal girder inner plate positioning hole is distributed in two laterally between induction grooves；It is described
Front longitudinal outside plate is provided with front longitudinal outside plate positioning hole, and the position of the front longitudinal outside plate positioning hole and front longitudinal girder inner plate positioning hole exists
It is corresponding in vehicle coordinate system Y-direction；The connecting board structure includes collision prevention girders outside plate connecting plate, collision prevention girders connecting plate and preceding vertical
Beam connecting plate, the collision prevention girders connecting plate carry out assembling company with collision prevention girders outside plate connecting plate, front longitudinal connecting plate by bolt
Connect, the collision prevention girders outside plate connecting plate is connected with collision prevention girders outside plate by spot-welding technology, front longitudinal connecting plate passes through spot-welding technology
Front longitudinal girder inner plate is connected with front longitudinal outside plate, so as to realize the fixed company between anticollision girder construction and front longitudinal front segment structure
Connect.
In such scheme, the front longitudinal front segment structure is Varying-thickness structure, and the structure includes functional area A, B, C, often
The corresponding equal thickness area of individual functional area, two neighboring functional area realize that continuous transition connects by thickness transitions area, institute
The thickness distribution for stating thickness transitions area linearly changes, the thickness T of the functional area AA, functional area B thickness TBAnd work(
Energy region C thickness TCBetween magnitude relationship meet TB>TA>TC。
In such scheme, the double-head arrow type negative poisson's ratio structure includes several columns linear parallel arrangement architecture, per alignment
Property homogeneous texture is made up of the negative poisson's ratio structure structure cell being sequentially connected from beginning to end, and the negative poisson's ratio structure structure cell is by two groups
The type of falling V structure composition, and plane where two groups of reverse V-shaped structures is mutually perpendicular to, the reverse V-shaped structural top is plane, and two groups are fallen
V-structure top, the equal copline of footing；The reverse V-shaped structure include the coplanar first reverse V-shaped construction unit and second fall V
Type construction unit, and be the plane that is parallel to each other at the top of the first reverse V-shaped construction unit and the second reverse V-shaped construction unit, footing adds
Work is integrated, and being connected with to will pass through the reverse V-shaped structure of adhering process and other is formed three-dimensional double-head arrow type negative poisson's ratio structure.
In such scheme, the front longitudinal outside plate can use same material to prepare with front longitudinal girder inner plate, can also use xenogenesis
Prepared by material, and front longitudinal girder inner plate is formed by the rolling of flexible rolling technique.
The beneficial effects of the invention are as follows：
1) the collision prevention girders rigidity of structure of the filling double-head arrow type negative poisson's ratio structure in structure of the present invention is with flexural deformation
Increase and increase, there is very high bending resistance and flexural deformation energy absorption ability.
2) the Varying-thickness front longitudinal front segment structure in structure of the present invention uses rational thickness distribution form, improves material
Utilization rate, realize the light-weight design of front longitudinal front segment structure；Simultaneously because using flexible rolling technology so that front longitudinal table
Face does not have abrupt changes in thickness caused by weld seam, and its surface quality is good, and bonding strength is high, stress distribution is continuous.
3) present invention is according to the general arrangement boundary condition of automobile front chamber and the practical distortion feature of front longitudinal, classifying rationally
Front longitudinal front segment structure functional area, gives full play to the function in difference in functionality region, improves the collision energy-absorbing of front longitudinal.
Brief description of the drawings
Fig. 1 is a kind of automotive front end endergonic structure schematic diagram based on customizing functions of the present invention；
Fig. 2 is collision prevention girders structure chart of the present invention, and Fig. 2 (a) is collision prevention girders structural representation of the present invention, and Fig. 2 (b) is the present invention
The cross sectional shape schematic diagram of anticollision girder construction；
Fig. 3 is the filling mode schematic diagram of double-head arrow type negative poisson's ratio structure of the present invention；
Fig. 4 is double-head arrow type negative poisson's ratio structure chart of the present invention, and Fig. 4 (a) is double-head arrow type negative poisson's ratio structure of the present invention
Schematic diagram, Fig. 4 (b) are double-head arrow type negative poisson's ratio structure partial schematic diagrames of the present invention；
Fig. 5 is negative poisson's ratio structure cell configuration figure of the present invention, and Fig. 5 (a) is negative poisson's ratio structure cell configuration of the present invention
Schematic diagram, Fig. 5 (b) are negative poisson's ratio structure structure cell longitudinal profile schematic diagrams of the present invention；
Fig. 6 is the assembly relation schematic diagram of collision prevention girders outside plate of the present invention and collision prevention girders outside plate connecting plate；
Fig. 7 is the assembly relation schematic diagram of collision prevention girders outside plate connecting plate and collision prevention girders connecting plate of the present invention；
Fig. 8 is the assembly relation schematic diagram of collision prevention girders connecting plate and front longitudinal connecting plate of the present invention；
Fig. 9 is the assembly relation schematic diagram of front longitudinal front-end architecture and front longitudinal connecting plate of the present invention；
Figure 10 is Varying-thickness front longitudinal front segment structure schematic diagram of the present invention；
Figure 11 is Varying-thickness front longitudinal front segment structure thickness distribution schematic diagram of the present invention.
Wherein：1- collision prevention girders outside plates, 2- double-head arrow type negative poisson's ratio structures, 3- collision prevention girders inner panels, 4- front longitudinal girder inner plates, 5-
Front longitudinal girder inner plate positioning hole, 6- induction grooves, 7- flange, 8- front longitudinal outside plates, 9- front longitudinal outside plate positioning holes, outside 10- collision prevention girders
Plate connecting plate, 11- collision prevention girders connecting plates, 12- front longitudinal connecting plates, the first reverse V-shaped construction units of 13-, the second reverse V-shaped knots of 14-
Structure unit.
Embodiment
For the present invention is expanded on further to reach the technological means and effect that predetermined purpose is taken, below in conjunction with accompanying drawing pair
The present invention is described further.However, accompanying drawing is only to provide reference and purposes of discussion to the present invention, not to the present invention
It is any limitation as.
Fig. 1 is a kind of automotive front end endergonic structure schematic diagram based on customizing functions of the present invention, including section is in concave character type
Anticollision girder construction (shown in Fig. 2 (b), concave character type structure is used for the bending rigidity for improving anticollision girder construction and collision collision is inhaled
Can), the Varying-thickness front longitudinal front segment structure and connecting board structure that section is single shape for hat, anticollision girder construction both ends are hardened by connecting
Structure realizes being fixedly connected between front longitudinal front segment structure.
Anticollision girder construction includes collision prevention girders outside plate 1, double-head arrow type negative poisson's ratio structure 2 and collision prevention girders inner panel 3, outside collision prevention girders
Plate 1 and collision prevention girders inner panel 3 form a closed cavity by solder joint technique, and as shown in Fig. 2 (a), filling is double inside closed cavity
Arrowhead-shaped negative poisson's ratio structure 2, as shown in Figure 3；As shown in Fig. 4 (a), (b), double-head arrow type negative poisson's ratio structure 2 includes some
Linear homogeneous texture, each column linear parallel arrangement architecture are made up of the negative poisson's ratio structure structure cell being sequentially connected from beginning to end,
The structure cell of arrowhead-shaped negative poisson's ratio structure 2 is by two groups of reverse V-shaped structure compositions, and plane where two groups of reverse V-shaped structures is mutually perpendicular to,
Reverse V-shaped structural top is plane, two groups of reverse V-shaped structural tops, the equal copline of footing；Such as Fig. 5 (a), (b), reverse V-shaped structure bag
Include the first reverse V-shaped 13 and second reverse V-shaped construction unit 14 of construction unit, wherein, the first reverse V-shaped construction unit 13 and second fall V
Be the plane that is parallel to each other at the top of the unit of type structure 14, footing be processed as one, will pass through adhering process and other V-structures
It is connected and forms three-dimensional double-head arrow type negative poisson's ratio structure.The anticollision girder construction of double-head arrow type negative poisson's ratio structure 2 is mainly used in
Bending load is carried under low speed collision operating mode, with the increase of bending load, the Equivalent Elasticity of double-head arrow type negative poisson's ratio structure 2
Modulus increases therewith, and its rigidity of structure also gradually increases.Therefore, the anticollision girder construction of double-head arrow type negative poisson's ratio structure 2 has
Very high bending resistance and flexural deformation energy absorption ability, the structure is mainly used in carrying bending impact load, while realizes light weight
Change design.
Varying-thickness front longitudinal front segment structure include front longitudinal girder inner plate 4, front longitudinal girder inner plate positioning hole 5, induction groove 6, flange 7,
Front longitudinal outside plate 8 and front longitudinal outside plate positioning hole 9, front longitudinal girder inner plate 4 and front longitudinal outside plate 8 pass through a welder at flange 7
Skill carries out assembly connection, and forms the cavity of a closing, and front longitudinal girder inner plate 4 is indulged before laterally inducing groove 6 and one provided with two
Beam inner panel positioning hole 5, two laterally groove 6 is parallel is distributed in functional area A for induction, and front longitudinal girder inner plate positioning hole 5 is distributed in two
Each and every one is laterally induced between groove 6；The front longitudinal outside plate 8 is provided with front longitudinal outside plate positioning hole 9, front longitudinal outside plate positioning hole 9 with
The position of front longitudinal girder inner plate positioning hole 5 is corresponding in vehicle coordinate system Y-direction.Front longitudinal girder inner plate 4 can be adopted with front longitudinal outside plate 8
Prepared with same material, can also use foreign material to prepare, and front longitudinal girder inner plate 4 is formed by the rolling of flexible rolling technique：It is first
The variable-thickness steel plate consistent with front longitudinal girder inner plate thickness distribution, then profit are rolled out first with TRB (continuous variable thickness rolling mill practice)
Variable-thickness steel plate is stamped into Varying-thickness front longitudinal girder inner plate with Sheet Metal Forming Technology.
Connecting plate includes collision prevention girders outside plate connecting plate 10, collision prevention girders connecting plate 11 and front longitudinal connecting plate 12, anticollision in Fig. 7
Beam outside plate connecting plate 10 carries out assembly connection by bolt and collision prevention girders connecting plate 11, and collision prevention girders connecting plate 11 passes through spiral shell in Fig. 8
Bolt carries out assembly connection with front longitudinal connecting plate 12, and collision prevention girders outside plate connecting plate 10 passes through a welder with collision prevention girders outside plate 1 in Fig. 6
Front longitudinal connecting plate 12 is connected front longitudinal girder inner plate 4 and front longitudinal outside plate 8 by spot-welding technology in skill connection, Fig. 9, so as to realize
Being fixedly connected between anticollision girder construction and front longitudinal front segment structure.
Figure 10 is Varying-thickness front longitudinal front segment structure schematic diagram of the present invention, and Varying-thickness front longitudinal front segment structure is mainly used in
Induction produces gradual folding conquassation deformation pattern under high velocity impact operating mode, improves the axial collapse energy-absorption of front longitudinal front segment structure
Ability and average impact, while realize the light-weight design of front longitudinal.Varying-thickness front longitudinal front segment structure includes 3 functional areas
Domain A, B, C, wherein functional area A and functional area B are mainly used in making front longitudinal produce metastable axial conquassation deformation,
It is main collision energy-absorbing area；Functional area C is relevant with the arrangement space of engine, is mainly used in transmitting impact force.Such as figure
11：The corresponding equal thickness area of each functional area of Varying-thickness front longitudinal front segment structure, two neighboring functional area pass through thickness
Degree transition region realizes that continuous transition connects, i.e., described Varying-thickness front longitudinal front segment structure includes 3 equal thickness areas and 2 thickness mistakes
Area is crossed, and the thickness distribution in thickness transitions region linearly changes；Functional area A thickness TA, functional area B thickness TBWith
And functional area C thickness TCBetween the magnitude relationship that meets be TB>TA>TC。
In summary, the variation rigidity characteristic of front end endergonic structure combination double-head arrow type negative poisson's ratio structure of the present invention improves vapour
The bending resistance and flexural deformation energy absorption ability of car collision prevention girders, collided using continuous variable thickness flexible rolling technology and front longitudinal
The deformation space in conquassation area, farthest improve the collision energy-absorbing ability of front longitudinal front segment structure, improve deformation pattern, so as to
Realize the lightweight and crash-worthiness design to automotive front end endergonic structure.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For designer, some improvement projects without departing from the principles of the present invention, the protection for belonging to the present invention is regarded as
Scope.
Claims (10)
1. a kind of automotive front end endergonic structure based on customizing functions, including anticollision girder construction, front longitudinal front segment structure and connection
Harden structure, the connecting board structure are used to realize being fixedly connected between anticollision girder construction and front longitudinal front segment structure；Its feature
It is：The anticollision girder construction includes collision prevention girders outside plate (1), double-head arrow type negative poisson's ratio structure (2) and collision prevention girders inner panel (3),
The collision prevention girders outside plate (1) and collision prevention girders inner panel (3) form a closed cavity by solder joint technique, are filled inside closed cavity
Double-head arrow type negative poisson's ratio structure (2)；The Varying-thickness front longitudinal front segment structure includes front longitudinal girder inner plate (4) and girder plate
(8), the front longitudinal girder inner plate (4) and front longitudinal outside plate (8) carry out assembly connection, and shape at flange (7) place by spot-welding technology
Into the cavity of a closing, the front longitudinal girder inner plate (4) is provided with laterally induction groove (6) and front longitudinal girder inner plate positioning hole (5), described
Front longitudinal outside plate (8) is provided with front longitudinal outside plate positioning hole (9), and the front longitudinal outside plate positioning hole (9) positions with front longitudinal girder inner plate
The position in hole (5) is corresponding in vehicle coordinate system Y-direction.
A kind of 2. automotive front end endergonic structure based on customizing functions according to claim 1, it is characterised in that：The company
Fishplate bar structure includes collision prevention girders outside plate connecting plate (10), collision prevention girders connecting plate (11) and front longitudinal connecting plate (12), the anticollision
Beam connecting plate (11) carries out assembly connection, institute with collision prevention girders outside plate connecting plate (10), front longitudinal connecting plate (12) by bolt
State that collision prevention girders outside plate connecting plate (10) is connected with collision prevention girders outside plate (1) by spot-welding technology, front longitudinal connecting plate (12) passes through a little
Welding connects front longitudinal girder inner plate (4) and front longitudinal outside plate (8), so as to realize anticollision girder construction and front longitudinal front segment structure it
Between be fixedly connected.
A kind of 3. automotive front end endergonic structure based on customizing functions according to claim 1, it is characterised in that：Before described
Longitudinal beam front section structure is Varying-thickness structure, and the structure includes functional area A, B, C, the corresponding equal thickness of each functional area
Area, two neighboring functional area realize that continuous transition connects by thickness transitions area.
A kind of 4. automotive front end endergonic structure based on customizing functions according to claim 3, it is characterised in that：The thickness
The thickness distribution of degree transition region linearly changes.
A kind of 5. automotive front end endergonic structure based on customizing functions according to claim 3, it is characterised in that：Before described
Side rail (4) is provided with two and laterally induces groove (6) and a front longitudinal girder inner plate positioning hole (5), and two laterally induce groove (6) flat
Row is distributed in functional area A, and front longitudinal girder inner plate positioning hole (5) is distributed between two horizontal induction grooves (6).
A kind of 6. new automobile front end endergonic structure based on customizing functions according to claim 1, it is characterised in that：Institute
State functional area A thickness TA, functional area B thickness TBAnd functional area C thickness TCBetween magnitude relationship meet TB
>TA>TC。
A kind of 7. automotive front end endergonic structure based on customizing functions according to claim 1, it is characterised in that：It is described anti-
The cross sectional shape for hitting girder construction is in concave character type, and the cross sectional shape of the front longitudinal front segment structure is single shape for hat.
A kind of 8. automotive front end endergonic structure based on customizing functions according to claim 1, it is characterised in that：It is described double
Arrowhead-shaped negative poisson's ratio structure (2) includes several columns linear parallel arrangement architecture, each column linear parallel arrangement architecture by head and the tail according to
Secondary connected negative poisson's ratio structure structure cell composition.
A kind of 9. automotive front end endergonic structure based on customizing functions according to claim 8, it is characterised in that：It is described negative
Poisson's ratio structure structure cell is by two groups of reverse V-shaped structure compositions, and plane where two groups of reverse V-shaped structures is mutually perpendicular to, the reverse V-shaped knot
It is plane at the top of structure, two groups of reverse V-shaped structural tops, the equal copline of footing；The reverse V-shaped structure include coplanar first fall V
Type construction unit (13) and the second reverse V-shaped construction unit (14), and the first reverse V-shaped construction unit (13) and the second reverse V-shaped structure
It is the plane that is parallel to each other at the top of unit (14), footing is processed as one.
A kind of 10. automotive front end endergonic structure based on customizing functions according to claim 1, it is characterised in that：It is described
Front longitudinal outside plate (8) can use same material to prepare with front longitudinal girder inner plate (4), can also use foreign material to prepare, and front longitudinal
Inner panel (4) is formed by the rolling of flexible rolling technique.
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| CN110758547A (en) * | 2019-11-04 | 2020-02-07 | 长安大学 | Crumple type automobile steering device based on negative Poisson ratio structure |
| CN112623105A (en) * | 2020-12-28 | 2021-04-09 | 深圳市新宏新科技有限公司 | Aluminum alloy section for unmanned ship body |
| CN113212348A (en) * | 2021-05-24 | 2021-08-06 | 吉林大学 | Front anti-collision beam assembly of automobile with stress form gradual conversion and energy absorption protection functions |
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| CN110758547A (en) * | 2019-11-04 | 2020-02-07 | 长安大学 | Crumple type automobile steering device based on negative Poisson ratio structure |
| CN110758547B (en) * | 2019-11-04 | 2023-11-14 | 长安大学 | Crumple type automobile steering device based on negative poisson ratio structure |
| CN112623105A (en) * | 2020-12-28 | 2021-04-09 | 深圳市新宏新科技有限公司 | Aluminum alloy section for unmanned ship body |
| CN112623105B (en) * | 2020-12-28 | 2023-08-15 | 深圳市新宏新科技有限公司 | Aluminum alloy section bar for unmanned ship body |
| CN113212348A (en) * | 2021-05-24 | 2021-08-06 | 吉林大学 | Front anti-collision beam assembly of automobile with stress form gradual conversion and energy absorption protection functions |
| CN113212348B (en) * | 2021-05-24 | 2022-06-24 | 吉林大学 | Front anti-collision beam assembly of automobile with stress form gradual conversion and energy absorption protection functions |
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