张开型粘(弹)塑性界面断裂

Interfacial crack in viscoelastoplastic media

研究张开型粘弹塑性界面断裂。用富里叶正、余弦变换及逐段定积分变换方法将边值问题的控制方程化为奇异积分方程组。解方程后计算了裂纹尖端塑性区尺寸及裂纹尖端张开位移COD。结果表明 :裂纹尖端塑性区尺寸和COD均随两种材料的最小屈服极限的增加而减小 ;COD随时间的增大而以先快后慢的速率增长。

The problem of viscoelastoplastic interfacial fracture is investigated. Fourier-cosine Transformation and Definite Integral Transformation reduce the equations governing the boundary problem into a group of singular equations, the solutions of which are used to formulate the plastic region size of the crack tip and COD. The results reveal that the plastic-region size of the crack tip and COD decline as the smaller yielding ultimate of the two bound materials get greater, while COD raises at a speed dropping down as the time passes.