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本文介绍了采用三维光弹性应力冻结法,对旋转正方形试样半边裂纹应力强度因子进行研究的成果。所总结的计算方法可推广应用于旋转矩形构件。理论和实验研究表明:问题属于线弹性,在四点弯曲条件下工作的带单边裂纹的旋转正方形试样,当裂纹纹路与荷载P的作用方向成某一夹角时,裂纹所在截面的弯矩值可以分解为垂直和平行于裂纹纹路的两个分弯矩,其裂纹尖端的应力强度因子亦可视为两状态的裂纹尖端应力强度因子的叠加。因为均系Ⅰ型裂纹,所以有K_I~((1)))=K_I~((2)))+K_I~((3)))。
This paper presents the results of studying the stress intensity factor of a half square crack of a rotating square specimen using the three-dimensional photoelastic stress freezing method. The summarized calculation method can be applied to rotating rectangular members. Theoretical and experimental studies have shown that the problem is linear elasticity. When a rotating square specimen with a unilateral crack is operated under four-point bending, when the direction of the crack line and load P is a certain angle, the crack at the cross section of the crack lies. The moment can be decomposed into two sub-bending moments which are vertical and parallel to the crack line. The stress intensity factor at the crack tip can also be regarded as the superposition of two-state crack tip stress intensity factor. Since all are type I cracks, there are K_I((1)))=K_I((2)))+K_I((3))).