The Elastic-viscoplastic Field of a Steady Propagating Crack Tip
Jia Bin(1),Wang Zhenqing(1),Li Yongdong(1),Fan Xuewei(2)
(1 Civil Engineering College, Harbin Engineering University, Harbin 150001) 
(2 Northern Jiaotong University Beijing 100044£©

Abstract: An elastic-viscoplastic model is adopted to replace the ordinary elastic-plastic one in this paper. Based on this, for mode I and II problems, the power law and logarithm singular tip field moving crack of an incompressible material under plane strain is obtained respectively. The results show that the plastic shock existed in elastic-plastic model is eliminated. The division of the two singular fields is obtained through numerical computation and the unified singular crack-tip field is established.
Keywords: elastic-viscoplastic material, dynamic propagation, viscosity coefficient, mach number.