方形截面管横向裂纹的应力强度因子KI

利用裂纹张开能量释放率建立了一个求解方形截面管横向裂纹应力强度因子的一个方法。给出了方形截面管裂纹张开能量释放率的 G*-积分表征,以及和应力强度因子的关系。同时也给出了 G*-积分与载荷、几何参量以及机械性能参数的关系,进而得到方形截面管横向裂纹的应力强度因子。给出的方法不仅适用于一般箱形结构件的裂纹问题,也适用于其它有限边界多边管状结构的三维裂纹问题,过程极为简单。

STRESS INTENSITY FACTOR KI FOR CRACKED BOX BEAMS

For cracked box beams, a simple exact method for determination of the stress intensity factors is proposed based on crack surface widening energy release rate. Unlike the classical crack extension energy release rate, the crack surface widening energy release rate is expressed by the G*-integral and elementary strength theory of materials for slender cracked structures. From the present discussions, some new and exact solutions of stress intensity factors are derived for square box beam with multi-cracks. The present method is also applicable to cracked polygonal thin-walled tubes.