Asymptotic field of mode Ⅱ dynamic growing crack in visco-elastic material  

作　　者：TANGLi-qiang ZHENGGui CAIYan-hong 

机构地区：[1]SchoolofCivilEngineering,HarbinEngineeringUniversity,Harbin150001,China

出　　处：《Journal of Marine Science and Application》2004年第2期73-78,共6页船舶与海洋工程学报（英文版）

摘　　要：A mechanical model of visco-elastic material is established in order to investigate viscous effect in dynamic growing crack-tip field of mode Ⅱ. It is shown that in stable creep growing phase, elastic deformation and viscous deformation are equally dominant in the near-tip field, the stress and strain have the same singularity, namely, (oε) ∝ r- 1/( n-1). The asymptotic solutions of separatied variables of stress, stain and displacement in crack-tip field are obtained by asymptotic analysis, and the results of numerical value of stress and strain in crack-tip field are obtained by shooting method. Through numerical calculation, it is shown that the near-tip fields are mainly governed by the creep exponent n and Mach number M. By the asymptotic analysis to the crack-tip field, the fracture criterion of mode Ⅱ dynamic growing crack of visco-elastic materials is put forward from the point of view of strain.

关 键 词：粘弹性材料 动力学 动态成长 渐近场 

分 类 号：U668.1[交通运输工程—船舶及航道工程]