含裂纹柴油机曲轴应力强度因子计算  

Calculation of Stress Intensity Factors for Cracked Diesel Engine Crankshafts

作　　者：王光钦[1] 李幸人[1] 高庆[1] 

机构地区：[1]西南交通大学应用力学与工程系,四川成都610031

出　　处：《西南交通大学学报》2002年第6期655-658,共4页Journal of Southwest Jiaotong University

基　　金：铁道部科技发展项目基金(97J25)

摘　　要：在内燃机动力分析的基础上,运用有限单元法,通过对曲轴应力分析,确定了裂纹启裂部位和扩展方向;运用子结构模型及位移法计算了不同裂纹深度下的应力强度因子值,由此拟合得到16V240ZJB柴油机曲轴几何形状因子表达式,为该型号及类似柴油机曲轴的疲劳断裂及断裂可靠性分析提供了必要的基础。A stress analysis of a diesel engine crankshaft is made by FEM based on dynamics analysis to determine the position of the initial crack and its propagation direction. The stress intensity factors of the cracks at various depths are calculated using displacement method on a substructure model, thereby the expression for the geometry factor of a 16V240ZJB diesel engine crankshaft is obtained by curve fitting. This work can afford a theoretical foundation for the fatigue and reliability analyses of diesel engine crankshafts of the same or alike types.

关 键 词：柴油机 曲轴 有限元方法 复合型裂纹 应力强度因子 裂纹扩展 计算方法 

分 类 号：TK423.31[动力工程及工程热物理—动力机械及工程] O34[理学—固体力学]