基于EQ4H型内燃机含裂纹曲轴的应力强度因子计算

发布时间：2018-01-20 09:57

本文关键词： 曲轴应力强度因子裂纹扩展长短轴比裂纹深度拟合　出处：《机械强度》2016年02期 　论文类型：期刊论文

【摘要】：内燃机曲轴上裂纹尖端的应力强度因子是计算裂纹扩展和疲劳剩余寿命的基础。首先利用Adams软件对曲轴—连杆系统进行刚柔耦合的动力学分析,得出第4曲柄销上承受的载荷最大,因此在其他边界条件相同时,第4曲柄销与轴肩的过渡圆角处最容易出现与轴肩呈45°夹角的椭圆形裂纹。然后将动力学分析得出的载荷作为曲柄销上的主要载荷进行裂纹尖端强度因子的计算,得到在不同长短轴比例(a/c)下强度因子随裂纹深度的变化趋势。在考虑到裂纹深度和裂纹长短轴比共同影响下,拟合得到EQ4H型内燃机曲轴几何形状因子的表达式,为此型号内燃机进行断裂力学的后续工作奠定了基础。
[Abstract]:The stress intensity factor at the crack tip of crankshaft of internal combustion engine is the basis of calculating crack propagation and fatigue residual life. Firstly, the rigid-flexible coupling dynamic analysis of crankshaft and connecting rod system is carried out by using Adams software. It is concluded that the fourth crank pin bears the greatest load, so that other boundary conditions are the same. The elliptical crack with 45 掳angle between the shaft shoulder and the crank pin is most likely to appear at the transition corner of the fourth crank pin. Then, the load obtained from the dynamic analysis is taken as the main load on the crank pin to carry out the crack tip strength factor. Calculation. The variation trend of intensity factor with crack depth under different long and long axis ratio is obtained, considering the influence of crack depth and crack long axis ratio. The expression of geometric shape factor of crankshaft of EQ4H type internal combustion engine was obtained by fitting, which laid a foundation for the subsequent work of fracture mechanics of the model internal combustion engine.
【作者单位】：西南石油大学机电工程学院;东风南充汽车有限公司;
【基金】：四川省科技厅科技支撑计划基金项目(2015GZ0159)资助~~
【分类号】：O346.1
【正文快照】： HE Wei1XIAO Xiang1CHEN Bo1YANG Zhi Yong2ZHANG Zi Li2(1.School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)(2.Dongfeng Nanchong Automobile Co.,Ltd.,Nanchong 637000,China)Corresponding author:XIAO Xiang,E-mail:1094381026@

【相似文献】