乘用车扭力梁耐久性开发关键问题研究

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主题词：扭力梁焊缝双轴疲劳块谱耐久性中图分类号：U462 文献标志码：A DOI：10.19620/j.cnki.1000-3703.20240527

KeyIssuesintheDurabilityDevelopmentof Passenger Vehicle Torsion Beam Axles

ChengWenzheng，Zhang Zhiyuan，Lou Weipeng，Guo Ranran，Liu Haifeng （GeelyAutomobileResearch Institute（Ningbo）Co.，Ltd.，Ningbo 315000）

【Abstract】Aiming at the problem of torsion beam weldcrackingand base material cracking in durabilityroad test，an optimizationmethodintegratingurabilitysmulation，enchtestandmaufacturingprocessisproposed.Fistlysedothe equivalentstructural stressmethodandBrown-Millerbiaxialfatiguecriterion，theriskhotspots intheweldseamandbase materialareidentified.Secondlyonsideringthefectoftorsionalstiessvartiononteload，theloadspetrumadte bench test loadareupdated，andalow-high-lowloadingsequenceisadoptedtoaccuratelyreproducetheroad testcracking phenomenon.Finally，the fatigueperformance incritical areas is improved through structural morphologyoptimizationand manufacturing processenhancement.Theresults of benchandvehicleroad tests showthattheoptimizedtorsion beams have significantly longer life.

KeyWords： Torsionbeam，Weld seam，Biaxial fatigue，Block spectrum，Durability 【引用格式】程稳正，张志远，楼位鹏，等.乘用车扭力梁耐久性开发关键问题研究[J].汽车技术，2025（9）：44-52. CHENG WZ，ZHANGZY，LOUWP，etal.KeyIssesin the Durability Developmentof Passenger Vehicle TorsionBeam Axles[J].Automobile Technology，2025（9）： 44-52.

1前言

扭力梁具有结构紧凑、制造成本低和空间利用率高等特点，广泛用于乘用车后悬架[1-2]，其刚度特性直接影响车辆的操控稳定性和NVH性能。（剩余11145字）