Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 417-425.doi: 10.13229/j.cnki.jdxbgxb20190202

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Application of fiber reinforced composite in auto⁃body panel

Hui YE1(),Chang LIU1,Kang-kang YAN2   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.Technology Center，Shanxi Automobile Holding Group Co. LTD，Xi'an 710000, China
  • Received:2019-03-04 Online:2020-03-01 Published:2020-03-08

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Abstract:

In this study, carbon fiber and glass fiber reinforced materials and epoxy resin matrix materials were used to design the layer structure of automobile engine hood. Sample of automobile engine hood is manufactured and comparative analysis of its performance is conducted. The results show that the fiber reinforced engine hood can not only meet the requirements of stiffness and modal, but also effectively reduce the weight of the engine hood. Under different working conditions, the simulation results of the free modal, transverse bending stiffness and torsional stiffness of the engine hood were compared with the experimental results and the performance of the original steel engine hood, which verified the effectiveness of the design. The optimization design of the composite engine hood was further studied. Compared with the initial design, the weight of the engine hood was further reduced by 9.7% through optimization. The design gives full play to the advantages of the fiber composite material in automobile lightweight.

Key words: vehicle engineering, carbon fiber reinforced composite, lightweight, engine hood, optimization

CLC Number: 

  • U465.6

Table 1

Single layer mechanical property test data of fiber reinforcement"

参数单向碳纤维预浸料单向玻璃纤维预浸料

玻璃纤维

编织布

ρ/10-9(T·mm-3)1.451.71.7
E1/MPa132 52547 00047 000
E2/MPa8 44016 40047 000
G12/MPa4 2196 00026 000
υ120.3360.280.28
G13/MPa4 2196 00011 000
G23/MPa3 2005 20011 000
ST1/MPa2 1411 1391 139
ST2/MPa40.4631 139
SC1/MPa1 0831 1131 280
SC2/MPa103.92381 280
S12/MPa117107115

Fig.1

Geometric model of fiber reinforced composite engine cover"

Fig.2

Sample of fiber composite engine cover"

Fig.3

First order overall torsion"

Fig.4

First order overall bending"

Fig.5

Modal test"

Fig.6

Lateral stiffness analysis"

Fig.7

Lateral stiffness simulation analysis"

Fig.8

Lateral stiffness test"

Fig.9

Analysis of torsional stiffness (intermediate constraint)"

Fig.10

Simulation analysis of torsional stiffness (intermediate constraint)"

Fig.11

Torsional stiffness (intermediate constraint) test"

Fig.12

Analysis of torsional stiffness (edge constraint)"

Fig.13

Simulation analysis of torsional stiffness (edge constraint)"

Fig.14

Torsional stiffness (side constraint) test"

Table 2

Simulation value of composite material engine cover, experimental value and comparison result of original steel parts"

项目仿真值（复合材料）试验值（复合材料）钢制件（试验结果）试验值与钢制件对比/%
发动机罩质量/kg10.010.020.5-51.2
横向刚度/（N·mm-1）337.8369.9243.951.6
扭转刚度（中间约束）/（N·mm-1）25.324.510.4135.6
扭转刚度（边约束）/（N·mm-1）6.857.2415.9-54.4
一阶整体扭转模态/Hz34.029.914.7103.4
一阶整体弯曲模态/Hz49.241.825.067.2
表面刚度无失稳，未出现不可修复性凹坑无失稳，未出现不可修复性凹坑无失稳，未出现不可修复性凹坑表面刚度均满足要求

Fig.15

Structural optimization process design"

Fig.16

Optimizing hood mass change curve during iteration"

Fig.17

Comparison before and after thickness optimization of engine hood"

Fig.18

Comparison of interior plate Angle optimizationbefore and after engine hood"

Table 3

Comparison of optimized performance parameters of composite hood"

参数优化前（有限元仿真结果）优化后（有限元仿真结果）优化前、后对比/%
发动机罩质量/kg10.09.03-9.7
横向刚度/（N·mm-1）337.8310.7-8.0
扭转刚度(中间约束)/（N·mm-1）25.322.3-11.9
扭转刚度(边约束)/mm6.857.13.6
一阶整体扭转/Hz32.034.68.1
一阶整体弯曲/Hz49.251.24.1
表面刚度无失稳和不可修复凹坑无失稳和不可修复凹坑表面刚度均满足要求
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