复合结构圆柱钱币裂纹的应力强度因子

STRESS INTENSITY FACTORS FOR PENNY-SHAPED CRACK IN COMPOSITE CYLINDERS

利用裂纹张开能量释放率建立一个求解复合圆柱钱币裂纹应力强度因子的方法。给出G 积分在三维裂纹裂尖边缘近场的应力强度因子表征 ,G 积分与载荷、几何参量以及力学性能参数的关系 ,进而得到复合圆柱钱币裂纹的应力强度因子。研究表明该积分法用于分析计算有限边界三维裂纹问题 ,过程极为简单。

Using the concept of crack mouth widening energy release rate, a very simple method to determine stress intensity factors for cracked composite cylinder is proposed. The G * integral expressed by stress intensity factor of three dimensional cracks is derived. Finally, from conservation law, a series of closed form solutions of stress intensity factors for cracked composite cylinders under different loads such as bending, tensions, three point bending, distributed loads and combined loads have been found. The discussions in present paper show that G * integral theory facilitates extremely to analyze the three dimensional cracks in composite cylinders.