平板穿透裂纹尖端动态应力强度因子研究

摘要

针对含裂纹平板承受冲击载荷时裂纹尖端动态应力强度因子的求解问题，采用将动态有限元分析过程和相互作用积分计算应力强度因子相结合的方法，在有限元分析软件ANSYS中利用APDL编程求解动态应力强度因子．经验证，此方法具有很高的准确性．基于该方法对裂纹长度、裂纹角度、冲击载荷大小对动态应力强度因子的影响进行研究．结果表明，动态Ⅰ型应力强度因子最大值约为相同大小静态载荷应力强度因子的2．6倍；当斜裂纹角度为45°时动态Ⅱ型应力强度因子达到最大值．%In order to obtain the dynamic stress intensity factors (DSIFs) of a cracked plate subjected to impact load ,the method by combining the dynamic finite element analysis process and the interaction integral method is used .APDL can be used to evaluate the DSIFs in the finite element software AN-SYS .This method is verified and has a high accuracy .Besides ,the influences of crack length ,crack angel and impact load magnitude to the DSIFs are investigated and discussed .The results show that the maximum of the I type DSIFs is about 2 .6 times the magnitude of SIF with the same size static load .When the inclined crack with 45 degrees ,the II type DSIFs reaches the maximum .