Ⅱ型动态裂纹尖端的滑开位移及塑性区

The Sliding Displacement and Plastic Zone of Mode Ⅱ Dynamic Crack Tip

由于数学和物理上的困难，目前对Ⅱ型动态裂纹问题的研究较少。本文利用数值方法分析了Ⅱ型动态裂纹问题，采用shmuely的有限差分格式（5）并且利用塑性理论中的Von－Mises屈服准则研究和探讨了裂纹快速扩展时动态裂纹滑开位移及裂纹尖端的塑性区形状和尺寸随各种参数的变化规律，并且对其在地震学中可能的应用作了初步探讨。

Because the difficulties both in Mathmatics and Physics, The researcli aboutMode Ⅱ dynamic cracks are reletiveIy a few at present. In this paper, the problems ofMode Ⅱ dynamic crack are analysed by numericai method, and it is discussed by the finitedifference scheme of shmuely(5)and Von-Mises yielding criterion that the various regularpatterns of dynamic sliding displacements and the shapes and sizes of plastic zones varywith some parameters when Mode Ⅱ, cracks propagate quickly. and some of its probablyapplications in earthquake are discussed initially.