自动化与信息工程2025，Vol.46Issue(6)：48-54,7.DOI:10.12475/aie.20250607
压力机连杆断裂失效分析
Failure Analysis of a Press Connecting Rod Fracture
摘要
Abstract
Aiming at the problem of frequent fracture failure of press connecting rods,this study analyzes the causes of rod fracture based on an actual case,and systematically applies methods such as macro-and micro-fracture observation,chemical composition analysis,metallographic structure observation,tensile and hardness testing,and finite element analysis to collaboratively analyze the influence of material and structural factors on the fracture.The results show that fatigue striations are present near multiple cracks on the fracture surface,consistent with the morphological characteristics of fatigue fracture;the material's tensile strength,elongation after fracture,and hardness all meet the requirements of the Q235 steel standard,but the yield strength is lower than the standard requirement;the material's microstructure composition is unevenly distributed,and stress concentration occurs at the junction between the big end and the rod body,with the maximum stress reaching 47.72 MPa.This verifies the cause of the connecting rod fracture:under cyclic loading,local plastic deformation occurs in the maximum stress area of the rod,initiating microcracks that gradually propagate until fatigue fracture occurs.Based on this,improvement measures for the connecting rod's structural design,material selection,and manufacturing process are proposed to enhance its fatigue strength and service life,providing a reference for the design improvement of such connecting rods.关键词
压力机/连杆/断裂失效/失效分析/有限元分析Key words
press/connecting rod/fracture failure/failure analysis/finite element analysis分类
机械制造引用本文复制引用
卫紫君,李佳仪,何治国,黄栋,司卫征..压力机连杆断裂失效分析[J].自动化与信息工程,2025,46(6):48-54,7.基金项目
广州市科技计划项目重点研发计划(202206030006,2023B04J0029,2023B04J0022) （202206030006,2023B04J0029,2023B04J0022）
