双轴拉伸条件下张开型裂纹的数值模拟

Numerical simulation calculation of model I crack under biaxial tension

采用FLAC3D数值模拟软件,对线弹性各向同性模型中的bulk和shear取5个不同的参数值,进行单轴拉伸条件下I型裂纹的数值模拟计算,通过应力云图、等值线图以及等值线值进行综合比较,确定线弹性模型的2个参数的数值为5e4.在确定模型参数的基础上,对I型裂纹进行双轴拉伸条件下的数值模拟计算.通过对比2种情况下I形裂纹附近的应力情况发现:在双轴拉伸条件下I型裂纹附近出现的应力比单轴拉伸条件下减小了很多.同时,双轴拉伸条件下,等值线的变化趋势在I型裂纹附近也相对平缓.在一定程度上,双轴拉伸缓解了I型裂纹附近在单轴拉伸条件下出现的应力集中现象.

Used FLAC3D, the numerical simulation calculation of model l crack under uniaxial tension are conducted when five groups parameters of bulk and shear are selected. Through the analysis of stress nephogram, contour map and isoline＇ s value, the parameters of bulk and shear are confirmed. On the basis of confirming parameters of bulk and shear, the numerical simulation calculation of model I crack under biaxial tension are conducted, it concludes that stress - focus phenomenon near model I crack disappears under biaxial tension, but the stress - focus phenomenon occurs on four comer of model, that＇ s to say, when the model is large enough, the stress - focus phenomenon will be on infinite point.