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采用弹粘塑性力学模型,对II型动态扩展裂纹尖端的对数奇异性,进行了数值仿真计算。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]中过度区的成因,对过度区尖端场解的形式和求解方法做了合理的推测。
Using the visco-elastic plastic model, the logarithmic singularity of Type II dynamic crack tip is numerically simulated. The influence of viscous 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. The cause of the excess region in [1] is explained and the speculation of the solution and form of the tipfield solution in the excess region is reasonably speculated.