CN111055739A - Carbon fiber composite material seat back framework and design method thereof - Google Patents
Carbon fiber composite material seat back framework and design method thereof Download PDFInfo
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- CN111055739A CN111055739A CN201911355721.3A CN201911355721A CN111055739A CN 111055739 A CN111055739 A CN 111055739A CN 201911355721 A CN201911355721 A CN 201911355721A CN 111055739 A CN111055739 A CN 111055739A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/64—Back-rests or cushions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/68—Seat frames
- B60N2/686—Panel like structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
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Abstract
The invention discloses a carbon fiber composite material seat back framework and a design method thereof, wherein the carbon fiber composite material seat back framework comprises a framework body, wherein the framework body comprises a wrapping buckle ring mounting surface, a metal piece mounting surface and an angle adjuster mounting surface; two wrapping buckle ring mounting surfaces are symmetrically arranged on the framework body; two metal piece mounting surfaces are symmetrically arranged on the framework body; the two angle adjuster mounting surfaces are symmetrically arranged on the framework body; and three pavement areas with different thicknesses are paved on the framework body. Through the mode, the light-weight automobile seat framework can meet the requirement of light weight of the automobile seat framework, the mechanical performance of the carbon fiber composite material on the seat is exerted to a greater extent, and parts of the automobile seat framework are reduced.
Description
Technical Field
The invention relates to the technical field of automobile seats, in particular to a carbon fiber composite material seat back framework and a design method thereof.
Background
The carbon fiber composite material is a novel material of high-strength and high-modulus fiber, is lighter than aluminum in weight and has higher strength than steel; the carbon fiber composite material product has flexible design and various molding processes.
With the development of the automobile industry, the requirement for light weight of automobile parts is stricter and more, and carbon fiber composite materials lighter than metal are applied to automobile seats more and more. The seat plays a decisive role in protecting passengers as a safety part for reducing damage, so that the seat becomes an important part in the research of automobile safety. According to the regulations of GB15083 method for testing the strength of a vehicle seat system, when a load corresponding to 20 times of the weight of a backrest and the impact strength generated by a frontal collision are horizontally exerted forwards through the respective mass center of the backrest, a passenger cannot slide out of a safety belt, seat parts and a stopping and adjusting device are not cracked or broken accurately, bending is allowed, and a backrest release device (two doors) still needs to keep functional integrity. The seat made of the carbon fiber composite material can greatly improve the safety performance of the seat and reduce the damage to a human body caused by collision in accidents. However, the existing automobile seat frame made of the carbon fiber composite material is complex in manufacturing and low in integrity, and the physical properties of the carbon fiber composite material, such as high strength, high modulus and the like, are not effectively exerted. In order to meet the requirement of light weight of the automobile seat framework and to exert the mechanical performance of the carbon fiber composite material to a greater extent, a design method of the carbon fiber composite material seat back framework becomes urgent.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the defects of the prior art, the carbon fiber composite material seat back framework and the design method thereof are provided, the requirement of light weight of the automobile seat framework can be met, the mechanical performance of the carbon fiber composite material is exerted to a greater extent, the parts of the automobile seat framework are reduced, and the integrity of the automobile seat is enhanced.
In order to solve the technical problems, the invention adopts a technical scheme that: the backrest framework of the carbon fiber composite material seat comprises a framework body, wherein the framework body comprises a wrapping buckle ring mounting surface, a metal piece mounting surface and an angle adjuster mounting surface; two wrapping buckle ring mounting surfaces are symmetrically arranged on the framework body; two metal piece mounting surfaces are symmetrically arranged on the framework body; the two angle adjuster mounting surfaces are symmetrically arranged on the framework body; and three pavement areas with different thicknesses are paved on the framework body.
In a preferred embodiment of the invention, the laying material of the three different thickness layup areas is a carbon fiber fabric prepreg or a biaxial warp knit fabric prepreg.
In a preferred embodiment of the invention, the laying materials of the bottom layer and the surface layer of the three different-thickness laying areas are carbon fiber fabric prepregs, and the laying materials of the inner layer of the three different-thickness laying areas are biaxial warp knitted fabric prepregs.
In a preferred embodiment of the invention, the laying angle of the three different thickness pavement zones is divided into a combination of 0 °/90 ° layers and ± 45 ° layers.
In a preferred embodiment of the invention, the laying ratio of the 0 °/90 ° plies to the ± 45 ° plies is 57% and 43%.
In a preferred embodiment of the present invention, the three different thickness layers are divided into a common region, a first stress concentration region and a second stress concentration region, the common region is a surface layer region of the skeleton body, the first stress concentration region is a side wing region of the skeleton body, and the second stress concentration region is two metal member mounting surface regions.
In a preferred embodiment of the invention, the general area is laid down to a thickness of 2.4mm, the first stress concentration area is laid down to a thickness of 4.0mm, and the second stress concentration area is laid down to a thickness of 5.6 mm.
The design method of the carbon fiber composite material seat back framework comprises the following steps: .
(100) Structural design: designing the appearance surface and each mounting surface of the skeleton body according to the requirements of the assembly environment and the appearance structure of the carbon fiber composite material seat back skeleton, wherein the steps of design input, scheme design, calculation and test and verification whether the design requirements are met or not are sequentially carried out; if not, returning to the scheme design step; if so, completing the design;
(200) laying layer design: defining a layering sequence according to the carbon fiber layering design rule and areas with different thicknesses;
(300) and (3) calculating the intensity: and (4) referring to the designed model and the layer laying, carrying out simulation design by using ABAQUS, calculating finite elements, and analyzing the result.
In a preferred embodiment of the invention, the finite element calculations include modeling the mesh, defining material and cross-sectional properties, boundary conditions and loads.
In a preferred embodiment of the invention, the analysis result is to analyze the strength and rigidity of the carbon fiber seat back framework under different working conditions, and the optimal strength and rigidity result is obtained through iterative calculation.
The invention has the beneficial effects that: can reach the light-weighted requirement of car seat skeleton, and exert carbon-fibre composite's mechanical properties more, reduce car seat skeleton part, strengthen car seat's wholeness.
Drawings
FIG. 1 is a schematic structural view of a carbon fiber composite seat back armature of the present invention;
FIG. 2 is a schematic representation of a carbon fiber composite seat back armature shown in FIG. 1 after layering;
FIG. 3 is a flow chart of a structural design of a carbon fiber composite seat back armature shown in FIG. 1;
FIG. 4 is a flow chart of a ply design for the carbon fiber composite seat back armature shown in FIG. 1;
FIG. 5 is a test chart of the carbon fiber composite seat back frame of FIG. 1 under applied torque;
the parts in the drawings are numbered as follows: 1. skeleton body, 11, parcel buckle circle installation face, 12, metalwork installation face, 13, angle modulation ware installation face, 21, common district, 22, first stress concentration district, 23, second stress concentration district.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 to 5, an embodiment of the present invention includes:
a carbon fiber composite material seat back framework is shown in figures 1 and 2 and comprises a framework body 1, wherein a wrapping buckle ring mounting surface 11, a metal piece mounting surface 12 and an angle adjuster mounting surface 13 are arranged on the framework body 1; two wrapping buckle ring mounting surfaces 11 are symmetrically arranged on the framework body 1, are positioned in a headrest area, are glued with the wrapping buckle rings and are used for fixing a wrapping soft package on the inner side of the seat; two metal piece mounting surfaces 12 are symmetrically arranged on the framework body 1, are in threaded connection with metal pieces and are used for fixing the carbon fiber composite material seat back framework; the angle adjuster mounting surfaces 13 are symmetrically arranged on the framework body 1 and used for mounting angle adjusters. The outer surface of the skeleton body 1 is smooth in whole, natural in transition, visible for passengers in the back row and in accordance with ergonomics. The three mounting surfaces (the wrapping buckle mounting surface 11, the metal piece mounting surface 12 and the angle adjuster mounting surface 13) of the framework body 1 are suitable for being assembled with an environment piece, and the mounting is simple and detachable. The whole framework is an integer, is not a simple combination of simple carbon fiber rods, is not a heavy metal shell, has a transitional natural appearance structure with local reinforced thickening, and has higher integrity.
Three pavement areas with different thicknesses are paved on the framework body 1; the three different-thickness layering areas are divided into a common area 21, a first stress concentration area 22 and a second stress concentration area 23, the common area 21 is a surface layer area of the framework body 1, the first stress concentration area 22 is a side wing area of the framework body 1, and the second stress concentration area 23 is an area of the two metal piece mounting surfaces 12.
And the laying materials of the three laying areas with different thicknesses are carbon fiber fabric prepregs or biaxial warp knitting fabric prepregs. The method specifically comprises the following steps: the laying materials of the bottom layer and the surface layer of the three laying areas with different thicknesses are carbon fiber fabric prepreg, and the laying materials of the inner layer of the three laying areas with different thicknesses are biaxial warp-knitted fabric prepreg.
When in laying, the laying angles of the three laying areas with different thicknesses are divided into two types of combination of 0 degree/90 degree layers and +/-45 degree layers. The paving proportion of the 0 degree/90 degree layer to the +/-45 degree layer is 57% and 43%, the paving thickness of the common area is 2.4mm, the paving thickness of the first stress concentration area is 4.0mm, and the paving thickness of the second stress concentration area is 5.6 mm. The method specifically comprises the following steps: a first layer (P1) laying a general area 21, a first stress concentration area 22 and a second stress concentration area 23 at a laying angle of 0 °/90 °; a second layer (P2) laying a general area 21, a first stress concentration area 22 and a second stress concentration area 23 at a laying angle of ± 45 °; a third layer (P3) laying the first 22 and second 23 stress concentration zones at a lay angle of ± 45 °; a fourth layer (P4) of first 22 and second 23 stress concentrators laid at an angle of ± 45 °; a fifth layer (P5) laying normal zone 21, first stress concentration zone 22 and second stress concentration zone 23 at a laying angle of 0 °/90 °; a sixth layer (P6) laying a second stress concentration zone 23 at a laying angle of 0 °/90 °; a seventh layer (P7) laying the second stress concentration zone 23 at a laying angle of 0 °/90 °; an eighth layer (P8) with a general area 21, a first stress concentration area 22 and a second stress concentration area 23 laid at a laying angle of ± 45 °; a ninth layer (P9) laying a second stress concentration zone 23 at a laying angle of 0 °/90 °; a tenth layer (P10) with a second stress concentration zone 23 laid at a laying angle of 0 °/90 °; a tenth floor (P11) laying the general area 21, the first stress concentration area 22 and the second stress concentration area 23 at a laying angle of 0 °/90 °; a twelfth layer (P12) having first 22 and second 23 stress concentrators laid at a ± 45 ° lay angle; a thirteenth layer (P13) laying first 22 and second 23 stress concentration zones at a laying angle of ± 45 °; a fourteenth layer (P14) laying a general area 21, a first stress concentration area 22 and a second stress concentration area 23 at a laying angle of ± 45 °; a fifteenth layer (P15) laying normal zone 21, first stress concentration zone 22 and second stress concentration zone 23 at a lay angle of 0 °/90 °. The laying materials of the first layer (P1) and the fifth layer (P15) are carbon fiber fabric prepregs, and the laying materials of the rest layers are biaxial warp knitting fabric prepregs.
A design method of a carbon fiber composite material seat back framework comprises the following steps:
(100) structural design: designing the appearance surface and each mounting surface of the skeleton body according to the requirements of the assembly environment and the appearance structure of the carbon fiber composite material seat back skeleton, as shown in fig. 3, including the steps of design input, scheme design, calculation and test, and verifying whether the design requirements are met or not; if not, returning to the scheme design step; if so, completing the design; input parameters at the time of design input include technical requirements, usage requirements, and profile references; the scheme design comprises a structure scheme, structure material selection, a manufacturing process, weight distribution, three-dimensional modeling, a production drawing, a technical file, strength analysis, process inspection, development test, perfect design and the like; the structural material selection comprises the selection of a laying material, and the selection of the carbon fiber fabric prepreg and the biaxial warp-knitted fabric prepreg which are stably produced at present, meet the product thickness requirement, have complete material performance parameters and are low in cost; defining the laying thicknesses of three laying areas with different thicknesses, wherein the general thickness is 2.4mm (a common area), the local thicknesses are enhanced and thickened by 5.6mm (a second stress concentration area) and 4.0mm (a first stress concentration area) according to a possible stress concentration area, and the thicknesses are used as iterative calculation input of strength design;
(200) laying layer design: defining a layering sequence according to the carbon fiber layering design rule and areas with different thicknesses; as shown in FIG. 4, the ply design is completed according to the ply design flow;
(300) and (3) calculating the intensity: referring to a designed model and a layer-applying ABAQUS to carry out simulation design-finite element calculation-analysis results; the finite element calculation comprises the steps of establishing a grid model, defining material and section properties, boundary conditions and loads; and analyzing the deformation condition of the carbon fiber seat back framework under different working conditions according to the analysis result, and performing iterative computation to obtain the optimal strength and rigidity result. The method specifically comprises the following steps:
(I) requirements of working conditions
According to the test requirements and relevant specifications of the automobile seat, the test is carried out by applying two moments as shown in fig. 5, the test result is recorded, the force-displacement curve in the loading process is recorded, the deformation angle of the framework after the test is finished is recorded, and the corresponding result is recorded.
(II) simulation analysis
1. Definition of materials: and respectively measuring the performance data of the material such as tension, compression, bending, shearing and the like according to the ASTM test specification, and inputting the data into a material card.
2. And establishing a grid model and boundary conditions.
The method comprises the steps of adjusting the geometry of a metal piece, enabling the metal piece and a composite piece to be parallel on a bolt mounting end face, enabling the distance to be consistent with a digital-analog model, establishing RBE2 units at bolt hole positions of the metal piece and the composite piece, establishing CBUSH units between two independent points of the RBE2 units, defining unit rigidity as (4.61e6,2.83e7,2.83e7,2.21e7,2.88e7 and 2.88e7), establishing RBE2 units with hole centers and rotation shaft hole edge nodes and hole centers of ①, and constraining all 6 degrees of freedom of the hole centers, wherein ② has the coordinates of (0,0 and 500) loading points, the loading points are independent points, the back flanging nodes at the same horizontal height are non-independent points, establishing RBE2 units, and the loading direction is the X direction.
(III) analysis results
1. Through calculation, the results are as follows:
2. checking the extrusion strength of the carbon fiber composite material bolt hole:
the compression strength of the carbon fiber composite material is 363MPa, and the allowable value of the hole extrusion strength is 363 MPa/1.5-242 MPa. The upper bolt hole extrusion stress is shearing force/extrusion area is shearing force/(bolt diameter composite material thickness) 11587N/(10 5) 231.7MPa < [ s ] > 242 MPa. The lower bolt hole extrusion stress is shearing force/extrusion area is shearing force/(bolt diameter composite thickness) 9894N/(10 5) 197.9MPa < [ s ] > 242 MPa.
And (4) conclusion: the last model optimizes the range of the reinforced area, effectively reduces the maximum Tsai-Wu factor and ensures that the structure is safer; the design load value is 120% of the test load, so that the deformation is increased, and the deformation requirement is still met.
The invention discloses a carbon fiber composite material seat back framework and a design method thereof, which can meet the requirement of light weight of an automobile seat framework, can exert the physical performance of a carbon fiber composite material on a seat to a greater extent, reduce the parts of the automobile seat framework and enhance the integrity of the automobile seat.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The carbon fiber composite material seat back framework is characterized by comprising a framework body, wherein the framework body comprises a wrapping buckle ring mounting surface, a metal piece mounting surface and an angle adjuster mounting surface; two wrapping buckle ring mounting surfaces are symmetrically arranged on the framework body; two metal piece mounting surfaces are symmetrically arranged on the framework body; the two angle adjuster mounting surfaces are symmetrically arranged on the framework body; and three pavement areas with different thicknesses are paved on the framework body.
2. The carbon fiber composite seat back armature of claim 1, wherein the lay-up material of the three different thickness layup areas is a carbon fiber fabric prepreg or a biaxial warp knit fabric prepreg.
3. The carbon fiber composite material seat back skeleton of claim 2, wherein the paving materials of the bottom layer and the surface layer of the three different thickness paving regions are carbon fiber fabric prepregs, and the paving material of the inner layer of the three different thickness paving regions is a biaxial warp knit fabric prepreg.
4. The carbon fiber composite seat back armature of claim 1, wherein the lay angle of the three different thickness layup zones is divided into a combination of 0 °/90 ° layers and ± 45 ° layers.
5. The carbon fiber composite seat back armature of claim 4, wherein the 0 °/90 ° layer is laid at a ratio of 57% and 43% to the ± 45 ° layer.
6. The carbon fiber composite material seat back framework of claim 1, wherein the three different thickness layers are divided into a common region, a first stress concentration region and a second stress concentration region, the common region is a surface layer region of the framework body, the first stress concentration region is a side wing region of the framework body, and the second stress concentration region is two metal piece mounting surface regions.
7. The carbon fiber composite seat back skeleton of claim 6, wherein the common area is laid down at a thickness of 2.4mm, the first stress concentration area is laid down at a thickness of 4.0mm, and the second stress concentration area is laid down at a thickness of 5.6 mm.
8. A method of designing a carbon fiber composite seat back armature according to any one of claims 1 to 7, comprising the steps of:
(100) structural design: designing the appearance surface and each mounting surface of the skeleton body according to the requirements of the assembly environment and the appearance structure of the carbon fiber composite material seat back skeleton, wherein the steps of design input, scheme design, calculation and test and verification whether the design requirements are met or not are sequentially carried out; if not, returning to the scheme design step; if so, completing the design;
(200) laying layer design: defining a layering sequence according to the carbon fiber layering design rule and areas with different thicknesses;
(300) and (3) calculating the intensity: and (4) referring to the designed model and the layer laying, carrying out simulation design by using ABAQUS, calculating finite elements, and analyzing the result.
9. The method of designing a carbon fiber composite seat back armature of claim 8, wherein the finite element calculations include modeling a mesh, defining material and cross-sectional properties, boundary conditions, and loads.
10. The method for designing the carbon fiber composite material seat back framework according to claim 8, wherein the analysis result is that the strength and the rigidity of the carbon fiber composite material seat back framework under different working conditions are analyzed, and the optimal strength and rigidity result is obtained through iterative calculation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911355721.3A CN111055739A (en) | 2019-12-25 | 2019-12-25 | Carbon fiber composite material seat back framework and design method thereof |
| PCT/CN2020/100433 WO2021128799A1 (en) | 2019-12-25 | 2020-07-06 | Carbon fiber composite material seat backrest frame and design method therefor |
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| CN201911355721.3A CN111055739A (en) | 2019-12-25 | 2019-12-25 | Carbon fiber composite material seat back framework and design method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021128799A1 (en) * | 2019-12-25 | 2021-07-01 | 江苏亨睿碳纤维科技有限公司 | Carbon fiber composite material seat backrest frame and design method therefor |
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| WO2021128799A1 (en) * | 2019-12-25 | 2021-07-01 | 江苏亨睿碳纤维科技有限公司 | Carbon fiber composite material seat backrest frame and design method therefor |
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