正交异性复合材料J积分的研究

A Study of J-lntegral of the Orthotropic Composite Material

本文推导了正交异性复合材料板Ⅰ型裂纹Ｊ积分与位移导数的关系式，同时给出了应力强度因子Ｋ＿Ⅰ与位移的关系式，采用贴片云纹干涉法对三点弯曲粱进行了测试。由云纹图的位移场求出了Ｊ与Ｋ＿Ⅰ值，进而验证了正交异性复合材料板Ｊ与Ｋ＿Ⅰ的关系式的正确性。

The relation between J-integral near model Ⅰcrack tip in the ortliotropicplate and displacement derivative is derived in this paper. Meanwhile, the rela-tion between stress intensity factor K_Ⅰ and displacement is also given in this paper. With sticking film moire interferometry method the three-point bending beam is tested. thus the values of J-integral and K_Ⅰ can be obtained from the displacement field, and then the truth of the relat ion formula between J-integral and K_Ⅰ in the orthotropic composite materials is experimentally verified.