中文摘要：

基于断裂力学理论和有限元数值分析方法,针对压气机叶轮由于铸造缺陷和疲劳引起的三维裂纹,应用子模型技术和ParaMesh网格随移技术,给出了压气机叶轮轴孔三维裂纹前沿应力强度因子的求解方法及途径,并对压气机叶轮轴孔三维裂纹的扩展方向和扩展速率进行了分析。压气机叶轮轴孔三维裂纹应力强度因子求解结果表明,叶轮轴孔三维裂纹前沿应力强度因子随裂纹半径的增大而增大;裂纹前沿轴向的应力强度因子大于径向的应力强度因子,裂纹在轴向的扩展速率大于径向的扩展速率。

英文摘要：

A method for solving stress intensity factor of the crack front of an impeller hub is presented by applying ParaMesh and Submodel technology of ANSYS software based on fracture mechanics theory and finite element method.The crack growth rate and the expansion direction are analyzed by taking into account of the 3-D cracks of a compressor impeller which are caused by casting defect or fatigue.Calculation result shows that the axial crack growth rate exceed the radial expanding rate on the crack face,the axial stress intensity factor is greater than the radial stress intensity factor,and the stress intensity factor of the crack front increases with the increase of the crack radius of the 3-D crack front of the compressor impeller hub axle hole.