摘要
本文运用边界元方法提出了弯曲载荷作用下,平板中孔单边角裂纹裂尖的应力强度因子(SIF)的计算式。并通过实验研究了孔单边角裂纹在交变的弯矩作用下,裂纹的形貌变化规律及裂纹扩展速率,指出角裂纹沿长度方向的扩展可以用Paris公式来描述,而沿深度方向则不然,但两者之间具有幂函数的关系。
In this paper, a formula of stress intensity factor (SIF) for a single sided corner crack at an open hole in a plate under bending load was propsed using boundary element method. The shape development law and fatigue propagation law of the single-sided corner crack at an open hole under alterative bending moncnt was studied experimentally. The present work shows that the Paris equation can be used to describe the fatigue growth law for the corner crack in the length direection buit it can not be used in depth direction. A relation of exponential function is present between the crack growth in length and depth directions.
基金
国家自然科学基金
关键词
应力强度因子
疲劳扩展
角裂纹
stress intensity factor,fatigue growth, corner crack
