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,给出了计算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,基于压气机叶轮轴孔三维裂纹应力强度因子求解结果,指出叶轮轴孔三维裂纹前沿应力强度因子随裂纹半径的增加而增加,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。
By using the theory of fracture mechanism and finite element method based numerical analysis,in the light of the cracks on compressor impeller caused by the casting defect and fatigue,and making use of the modeling technique and ParaMesh mesh-shifting technique,this paper gives the methods and paths for calculating the 3D crack front SIF on impeller axlehole of gas compressor,and analyzes the extension direction and extension rate of the 3D crack on impeller axlehole of gas compressor,and based on calculation results of the 3D crack SIF on impeller axlehole of gas compressor,points out that the 3D crack front SIF on impeller axlehole increases along with the increase of crack radius, the crack front longitudinal SIF is more than radial 5IF, and the longitudinal extension rate is more than the radial extension rate.
出处
《科技情报开发与经济》
2009年第34期137-140,共4页
Sci-Tech Information Development & Economy
