An Equivalent Strain Gradient Theory for Evolvement of Damage in void Material
In this article,the onset conditions and evolvement path of the crack initiated from void edge in void material are investigated.For this end,the plane stress numerical simulation is implemented for a series of void embedded strip samples in Al-alloy.The stress and strain distribution for the whole plane sample is analyzed by elastic-plastic FEM.Based on the correspondence between equivalent strain distributions,the trend of equivalent strain gradient and the connected style of voids in experiment,a damage evolvement theory for the crack initiation and extension from vole edge is suggested.According to the suggested theory,as the loading increased,the crack is initiated from the edge of the void where the equivalent strain around the edge of the void reached its maximum; next,the initiated crack will propagated along the direction where the absolute gradient value of equivalent strain reached its maximum.It is indicated from the related experiments that the theory can reasonably explain the phenomena of the different linkage style of two holes.
void material path of the crack extension equivalent strain grade voids converge
Hong Zuo Fangwen Wang Teng Hou
State Key Laboratory of Mechanical Structure Strength and Vibration,School of Aerospace,Xian Jiaotong Univ.Xian,PR.China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）