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在利用弹粘塑性力学模型的情况下,对动态扩展裂纹尖端应力场的对数奇异性进行了研究。以II型裂纹为例进行了求解计算,详细地分析了粘性系数α、马赫数M2对裂纹尖端的应力场影响。指出了文献[1]中对数奇异性区域存在的问题,解释了文献[1]中过渡区的成因。
Using the visco-viscoplastic mechanics model, the logarithmic singularity of the stress field of a dynamically expanding crack tip is studied. Taking Type II crack as an example, the influence of viscosity coefficient α and Mach number M2 on the stress field at crack tip is analyzed in detail. The problem of the logarithmic singularity region in [1] is pointed out and the cause of the transition region in [1] is explained.