Asymptotic field of mode Ⅱ dynamic growing crack in visco-elastic material |
| |
作者姓名: | TANGLi-qiang ZHENGGui CAIYan-hong |
| |
作者单位: | SchoolofCivilEngineering,HarbinEngineeringUniversity,Harbin150001,China |
| |
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, (σε) ∝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 |
收稿时间: | 2004-06-14 |
本文献已被 维普 SpringerLink 等数据库收录! |
|