巴西圆盘复合断裂数值模拟研究  

Study on Numerical Simulation of Composite Fracture of Brazilian Disk

作　　者：麦麦提明·依比布拉 Maimetimen Ibibra(Kashgar Administration of Tarim River Basin,Xinjiang Uygur Autonomous Region,Kashgar 844700,China)

机构地区：[1]新疆维吾尔自治区塔里木河流域喀什管理局

出　　处：《广东水利水电》2019年第11期16-20,共5页Guangdong Water Resources and Hydropower

摘　　要：为研究复合断裂准则下含中心裂纹巴西圆盘在单轴应力下的裂纹扩展规律及应力变化过程,基于M积分理论及最大能量释放率准则,对含不同角度中心裂纹巴西圆盘在单轴应力下的裂纹扩展进行了数值模拟,得到了裂纹扩展过程,应力强度因子变化及应力云图,并与试验结果进行了对比,结果表明:①M积分及最大拉应力准则在裂纹扩展方面的计算具有较高的精度及准确性;②裂纹沿着原预制裂纹尖端萌生,沿最大主应力方向扩展;③一型应力强度因子在裂纹中部应力强度因子达到最大,并随预制裂纹倾角的增大呈现不断减小的趋势,而二型应力强度因子随着预制裂纹角度先增大后减小。In order to study the crack propagation law and stress change process of Brazil disc with central crack under uniaxial stress under the composite fracture criterion,the M integral theory and the maximum energy release rate criterion are used.By using Franc 3D software,the crack propagation of Brazilian disc with different angle center cracks under uniaxial stress is simulated.The crack propagation process,the change of stress intensity factor and the stress cloud diagram are obtained,and the results are compared with the experimental results.The results show that:(1)M integral and maximum tensile stress criterion have high accuracy and accuracy in the calculation of crack growth;(2)The numerical simulation results show that the prefabricated crack The grain propagation originates along the tip of the prefabricated crack and then propagates along the direction of the maximum principal stress,which leads to the failure of the specimen.(3)The stress intensity factor of mode one reaches the maximum in the middle of the crack and the minimum at the intersection of the crack and the specimen.(4)The mode 1 stress intensity factor decreases with the increase of the prefabricated crack inclination,while the mode 2 stress intensity factor increases first and then decreases with the precast crack angle increasing.The research results provide a certain reference for correctly understanding the crack propagation and fracture law of rock.

关 键 词：复合断裂 中心裂纹巴西圆盘 裂纹扩展 M积分 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]