【摘要】 将守恒律给出的裂纹非自发扩展,即最垂直于裂纹面扩展的能量释放率,应用于求解三角形截面管裂纹的应力强度因子.给出了三角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,进而得到三角形截面管横向裂纹的应力强度因子的封闭解.所给出的方法不仅适用于一般箱形结构件的裂纹问题,也适用其他有限边界多边管状结构的三维裂纹问题.更多还原

【Abstract】 For cracked triangle thinwalled beams, an exact and very simple method to determine the stress intensity factors has been proposed based on crack surface widening energy release rate. Unlike the classical crack extension energy release rate, the crack surface widening energy release rate can be expressed by the G*integral and elementary strength theory of materials for slender cracked structures. From present discussions, some new and exact solutions of stress intensity factors are derived for triangle thinwalled beam with multicracks. The present method can also be applied to cracked polygon thinwalled tubes.更多还原