偏心圆孔圆盘破坏模式的数值和试验研究

为了考察偏心圆孔圆盘在径向加载条件下,圆孔偏心位置和孔径大小对其破坏模式的影响,采用不同孔径大小和偏心距的偏心圆孔砂岩试件在RMT-150B试验机上进行了径向加载试验。基于Griffith强度准则,采用ANSYS有限元软件对44种不同构型的偏心圆孔圆盘模型径向加载条件下的应力集中系数进行了计算。数值模拟和试验结果表明,偏心圆孔最大应力集中系数随着偏心距的增大逐渐减小,且主要出现在圆孔的孔边和加载端点处,该位置对应试件的起裂点,试件的破坏角度与偏心距和圆孔孔径相关,给出了破坏角度的计算公式。偏心圆孔圆盘主要有两种破坏模式,Griffith强度准则能够判断其起裂位置。

Numerical and Experimental Research on the Fracture Mode of Eccentric Circular Holed Disc

To investigate the fracture mode of eccentric circular holed disc affected by the location and the size of eccentric circular hole under diametrical loading, some sandstone specimens are made and diametrically loaded in RMT-150B experiment machine. Based on Griffith intensity criterion, using the finite element software ANSYS, 44 kinds of eccentric circular holed disc models with different configurations are simulated, and the stress concentration factor is calculated. Results show that the maximum stress concentration factor decreases with the increase of eccentricity, which is mainly located around the eccentric hole and loading endpoint, moreover, the first fracture just appears on either of these two positions. The fracture angle of the specimen is related to the eccentricity and the hole diameter, and the formula to determine the fracture angle is given. There are two kinds of fracture modes for eccentric circular hole under diametrical loading, and the initial fracture point can be got according to Griffith strength criterion.