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Automotive Engineering ›› 2022, Vol. 44 ›› Issue (7): 1107-1116.doi: 10.19562/j.chinasae.qcgc.2022.07.017

Special Issue: 底盘&动力学&整车性能专题2022年

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Failure Load Analysis and Thickness Matching Optimization of Weld Seam on Front Axle of a Light Truck

Jinzhi Feng1,2,3,Chenglin Yuan1,Jiawei Yu4,Xinrong Liu5,Lihui Zhao1,2,3()   

  1. 1.School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai  200093
    2.CMIF Key Laboratory for Strength and Reliability Evaluation of Automotive Structures,Shanghai  200093
    3.Public Technology Platform for Reliability Evaluation of New Energy Vehicles in Shanghai,Shanghai  200093
    4.Shanghai Motor Vehicle Inspection Certification & Tech Innovation Center Co. ,Ltd. ,Shanghai  201805
    5.Technology Center,Yihe Axle Co. ,Ltd. ,Zhucheng  262200
  • Received:2021-12-21 Revised:2022-02-16 Online:2022-07-25 Published:2022-07-20
  • Contact: Lihui Zhao E-mail:pheigoe@126.com

Abstract:

In view of the weld seam failure in the front axle of a light truck, the load spectra of vehicle durability test are collected in proving ground, and the virtual iteration method is used to get the load time history of each connecting point of front axle. The finite element model of front axle is built and a fatigue life simulation on front axle’s weld seam is carried out using inertia relief method. The analysis results are consistent with the failure features of road test in proving ground, verifying the accuracy of the model. Furthermore, the local stress state at the weld seam is obtained by means of virtual strain gauge, the failure dominant load of the weld seam under the random load of proving ground is determined by studying the damage direction distribution, uniaxial damage comparison and principal stress direction distribution, and the effects of the weld seam thickness at three localities in failed zone on fatigue life are analyzed. Finally, a matching optimization is conducted on the three thickness parameters by applying adaptive response surface technique and the results show that the fatigue life of the weld seam zone is increased by nearly 8 times, and the road test in proving ground also meets the durability requirement of 10 000 km driving without failure.

Key words: light truck, front axle, weld fatigue, load spectrum, failure dominant load, weld seam thickness optimization