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提出了一种通过数字图像相关方法测定岩石Ⅰ-Ⅱ复合型裂纹尖端位置和应力强度因子的试验方法。试验通过数字图像相关方法测定裂纹尖端区域位移场数据,将位移场数据带入极坐标系下位移场方程,计算裂纹尖端位置和应力强度因子。试验结果表明:采用该方法可以准确的测定岩石Ⅰ-Ⅱ复合型裂纹应力强度因子、裂纹尖端位置及裂纹扩展长度,解决了以往研究方法因不能准确测定裂纹尖端位置和扩展方向,而无法准确测定岩石应力强度因子的难题。
A test method for determining the location and stress intensity factor of rock Ⅰ-Ⅱ composite crack tip by digital image correlation method is proposed. The digital image correlation method was used to determine the displacement field data of the crack tip region. The data of the displacement field were brought into the displacement field equation of polar coordinate system to calculate the crack tip location and stress intensity factor. The experimental results show that the method can accurately measure the stress intensity factor, crack tip position and crack propagation length of Ⅰ-Ⅱ composite cracks in rock, and can not be accurately determined because the method can not accurately determine the crack tip position and propagation direction Rock stress intensity factor of the problem.