摘要
工字形梁是工程中最常见的结构,其中的任何裂纹都将成为结构失效的隐患。带有裂纹的工字形梁是典型的三维结构,用经典方法求解其裂纹的应力强度因子通常是相当困难的。利用裂纹张开能量释放率得出了一个求解拉伸工字形截面梁中心裂纹的应力强度因子的新方法。给出工字形截面梁裂纹张开能量释放率的G 积分表征,以及与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,得到工字形截面梁腹板中心裂纹的应力强度因子。不仅适用于一般结构型材的裂纹问题,也适用其他有限边界薄壁结构中的三维裂纹问题。
The I-beam is widely used in structural engineering. Any cracks in it may cause the structure failure. As I-beam with cracks is typical three-dimensional structures, it is very difficult to determine the stress intensity factors by using classical method. In present, a new and very simple method to determine the stress intensity factors was proposed, based on crack surface widening energy release rate which can be expressed by the G* -integral and elementary strength theory of materials for slender cracked structures. A new and closed form of stress intensity factors was derived for I-beam with center crack. The present method can apply to not only common shaped engineering structures, but also other kinds of cracked thin-walled structures.
出处
《石油化工高等学校学报》
CAS
2003年第3期62-65,共4页
Journal of Petrochemical Universities
