汽车发动机锻造连杆应力模拟与失效分析  

Stress simulation and failure analysis of forged connecting rods for automobile engine

作　　者：李智杰 Li Zhijie(School of Traffic and Transportation,Dongguan Technician College,Dongguan 523460,China)

机构地区：[1]东莞市技师学院交通运输学院,广东东莞523460

出　　处：《锻压技术》2025年第4期19-24,共6页Forging & Stamping Technology

基　　金：2024年度世赛成果转化省级重点专项(KT2024131)。

摘　　要：针对汽车发动机连杆因材料性能不足导致的失效问题,以非调质钢C70S6为研究对象,对汽车发动机连杆进行了应力模拟与失效分析。首先,对断裂后的连杆进行了宏观、微观组织观察,并对其力学性能进行了测试。随后,运用ANSYS Workbench软件对连杆的等效应力、等效应变和等效弹性变形进行了模拟,通过建立三维模型和设置合理的边界条件与载荷,确定了应力集中区域。结果表明:连杆呈现韧性断裂特征,主要原因为材料硬度偏高、韧性不足,且最大应力与应变集中于连杆小头远离杆身部分。通过优化材料性能与结构设计,可有效提升连杆的可靠性和使用寿命,为汽车发动机关键部件的改进提供了理论依据与实践指导。In response to the failure problem of automobile engine connecting rods caused by insufficient material properties,for non-quenched and tempered steel C70S6,stress simulation and failure analysis of automobile engine connecting rods were conducted.Firstly,the macroscopic and microscopic structures of the fractured connecting rods were observed,and their mechanical properties were tested.Subsequently,the equivalent stress,equivalent strain and equivalent elastic deformation of the connecting rods were simulated by software ANSYS Workbench,and the stress concentration area was determined by establishing a three-dimensional model and setting reasonable boundary conditions and loads.The results show that the connecting rod exhibits ductile fracture characteristics,mainly due to the high hardness and insufficient toughness of the material,and the maximum stress and strain are concentrated in the part of the small head away from the rod body of connecting rod.By optimizing material properties and structural design,the reliability and service life of the connecting rods is effectively improved,providing a theoretical basis and practical guidance for the improvement of key components for automotive engines.

关 键 词：C70S6钢 连杆 失效分析 应力集中 力学性能 

分 类 号：U463.2[机械工程—车辆工程]