Micromechanical analysis of in-plane constraint effect on the local fracture behavior of cracks in the weakest locations of dissimilar metal welded joint
In this paper, a set of GTN (Gurson-Tvergaard-Needleman) parameters of the Alloy52M dissimilar metal welded joint (DMWJ) was calibrated, and a micromechanical analysis of in-plane constraint induced by crack depth effects on local fracture behavior of two cracks in the weakest regions of the DMWJ has been investigated by the local approach based on the GTN damage model.The results show that the partition of the material according to microstructure observation and hardness measurement and the variation of the q2 parameter near the crack tip will make the J-resistance curves obtained by numerical simulation close to the experimental values.The numerical J-resistance curves and crack growth paths are consistent with the experiment results, which shows that the GTN damage model can incorporate the in-plane constraint effect.Furthermore, after the stress/strain and void volume fraction during the process of crack growth were calculated, the variation of the J-resistance curve, crack growth path and the fracture mechanism with the in-plane constraint were analyzed.
Micromechanical analysis In-plane constraint Fracture behavior Dissimilar metal welded joint GTN damage model
J.Yang
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
国际会议
长沙
英文
93-98
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）