基于EQ4H型内燃机含裂纹曲轴的应力强度因子计算  

BASED ON THE STRESS INTENSITY FACTOR CALCULATION OF EQ4H TYPE INTERNL COMBUSTION ENGINE CRANKSHAFT WITH CRACK

作　　者：何畏[1] 肖祥[1] 陈波[1] 杨志勇 张自立 

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]东风南充汽车有限公司,南充637000

出　　处：《机械强度》2016年第2期369-373,共5页Journal of Mechanical Strength

基　　金：四川省科技厅科技支撑计划基金项目(2015GZ0159)资助~~

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。It is the stress intensity factor of crack tip on crankshaft of internal combustion engine that is the basis for calculating crack growth and residual life. Firstly,this paper using ADAMS software on the connecting rod system of crankshaft,analyzed the dynamics of rigid flexible coupling,draw that the fourth crank make maximum load. So in other same boundary conditions,the most prone elliptical crack is the direction of 45 DEG angle with the shaft shoulder,in the transition fillet of the fourth crank pin and Shaft Shoulder The load of the dynamic analysis calculation is regarded as the main force to calculate the intensity factor near the crack tip. Draw the trend of intensity factor with the crack depth changes under the different long and short axis ratio a / c. Under the condition of in considering the crack depth and the crack＇s long and short axis ratio＇s influence then fitting the expressions of shape factor of EQ4 H type internal combustion engine crankshaft. Laid the foundation for the followup work of fracture mechanics for this type internal combustion engine.

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 

分 类 号：O346.1[理学—固体力学]