【摘要】 将精密塑性成形汽车件的工程问题作为一个系统,基于三维大变形弹塑性力学理论、弹性力学理论和疲劳破坏理论,以数值模拟软件和相关疲劳计算软件为平台,建立了汽车件的精密塑性成形工艺与疲劳寿命智能分析系统。该系统首先模拟精密塑性成形,建立精密塑性成形工艺参数与零件内部应力—应变场之间的关系,在保留零件残余应力场的前提下,模拟分析零件的实际受力,获得了应力—应变响应,再结合材料疲劳性能参数和工作载荷,最终把精密塑性成形工艺参数与其受载后的疲劳寿命智能化地联系起来。经花键冷挤压工艺试验和疲劳试验验证,分析结果和试验结果吻合很好。更多还原

【Abstract】 Regarding the engineering problem of auto parts precision plastic forming as a system,based on 3D elasto-plastic mechanics theory for large strain,elastic mechanics theory and fatigue failure theory,combining related softwares for numerical simulation and fatigue calculation,an intelligent analysis system for precision plastic forming process and fatigue life of auto parts is set up.The system first simulate the process of precision plastic forming and builds the relation between process parameters and stress-strain field;then simulate and analyze the actual forces acting on the parts and get the stress and strain response on the premise of keeping residual stress field of the parts;and finally,combining fatigue property parameter of material and operating load,intelligently link the process parameter of precision plastic forming with the fatigue life under load.The verification tests of cold extrusion process and fatigue life of a spline shaft show that the analysis results agree well with those of testing.更多还原