基于相互积分的应力强度因子数值分析  

Numerical Analysis of Stress Intensity Factor Based on Interaction Integrate

作　　者：乐京霞[1] 周恒[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2013年第6期1248-1250,共3页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：中国博士后科学基金项目(批准号:20100470057);国家自然科学基金项目(批准号:51009111)资助

摘　　要：应力强度因子可反映裂纹尖端弹性应力场的强弱,是解决结构疲劳断裂问题的重要参数.工程上常采用有限元分析软件对各种复杂裂纹体进行数值模拟进而求解断裂问题.有限元分析软件ANSYS提供后处理功能可直接计算各种断裂参数.借助ANASYS计算平台,分别采用传统的位移插值法和基于相互积分的数值方法可求得张开型二维及三维裂纹应力强度因子.将数值分析结果与二维裂纹的解析解和三维裂纹扩展实验的测量结果进行对比分析后发现,基于相互积分理论求得的应力强度因子更为精确,这种优势在三维裂纹数值分析中更为显著.The stress intensity factor （SIF） is an important fracture parameter used to describe the stress distribution around crack tip area. For engineering application, some fracture problems can be well solved by finite element analysis （FEA）. The FEA software ANSYS provides powerful post-treatment to calculate some fracture parameters. In this paper, SIFs for 2D and 3D opening-mode cracks were obtained by ANSYS based on both displacement extrapolation method and interaction integral method. The numerical calculation results were compared with analytic solution and experimental measurement. It is demonstrated that the SIF obtained from interaction integral method is more accurate and this advantage becomes more remarkable for 3D crack.

关 键 词：应力强度因子 有限元分析 张开型裂纹 相互积分法 ANSYS 

分 类 号：O346.1[理学—固体力学]