A Suggestion to Make Gurson Damage Model Mesh Independent for Cracked Specimens

作     者：Bijon Kumar Dutta 

作者机构：Reactor Safety Division Hall-7 Bhabha Atomic Research Centre Mumbai 400 085 India 

出 版 物：《Journal of Mechanics Engineering and Automation》 (机械工程与自动化（英文版）)

年 卷 期：2011年第1卷第1期

页      面：61-67页

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Ductile fracture gurson model q2 Parameter J-R Curve mesh independent. 

摘      要：Continuum damage mechanics is applied to compute fracture J-initiation and J-Resistance （J-R） curve for 20MnMoNi55 material by analyzing TPB and CT specimens. A strong mesh dependency of Gurson model is observed. The exponential form of q2 parameter shown earlier near crack tip is further modified to have a variable asymptotic value q2a away from crack tip. The asymptotic value q2a is suggested to be a function of crack-tip mesh size to overcome mesh dependency of J-R and load-displacement curves. The relation between q2a with the normalized crack-tip mesh size is determined numerically for CT and TPB specimens.