汽车悬架减振器活塞杆安装失效原因分析OA
Analysis of installation failure causes of automobile suspension shock absorber piston rod
针对活塞杆在30 N·m静扭强度测试中发生的断裂问题,采用断口电镜观察与有限元仿真相结合的方法进行分析.结果表明:断裂发生于内六方孔处,断口呈现解理台阶与河流花样等脆性断裂特征,未见裂纹、空洞及夹杂;仿真显示该位置存在应力集中,最大等效应力达 678.14 MPa,已超过母材屈服强度(660 MPa).综合可知,结构设计不合理导致过载断裂是失效主因,可为活塞杆结构优化提供依据.
To address the fracture issue of the piston rod during a 30 N·m static torsion strength test,a combined approach of fracture surface electron microscope observation and finite element simulation was adopted for analysis.The results indicated that the fracture occurred at the internal hexagonal hole,and the fracture surface exhibited brittle fracture characteristics such as cleavage steps and river patterns,with no cracks,cavities,or inclusions detected.Simulation results revealed the presence of stress concentration at this location,where the maximum equivalent stress reached 678.14 MPa,exceeding the yield strength of the base material(660 MPa).Based on comprehensive analysis,the primary cause of failure was determined to be overload fracture induced by unreasonable structural design.This study provides a theoretical basis for the structural optimization of the piston rod.
马潇坤;张振隆;邵鑫竹;高坤
辽宁工业大学汽车与交通工程学院,辽宁 锦州 121000辽宁工业大学汽车与交通工程学院,辽宁 锦州 121000辽宁工业大学汽车与交通工程学院,辽宁 锦州 121000辽宁工业大学汽车与交通工程学院,辽宁 锦州 121000
机械制造
活塞杆断口分析有限元分析失效机理
piston rodfracture analysisfinite element analysisfailure mechanism
《农业装备与车辆工程》 2026 (1)
55-58,4
大学生创新训练计划项目(S202510154008)辽宁省重点研发计划(创新联合体)项目(2025JH2/102700008)
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