Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments

Effects of work hardening mismatch on fracture resistance behavior of bi-material interface regions

“…The void coalescence occurs when the void volume fraction f ⁄ reaches the critical values f C , and the fracture occurs when the f ⁄ reaches the critical failure void volume fraction f F . This modified model is referred as GTN model, which has been implemented in ABAQUS code and widely used to predict and simulate ductile crack growth and fracture resistance behavior of different specimens, material interfaces and welded joints [12,[16][17][18][27][28][29][30][31][32]. In this study, GTN damage model is used in the FEM simulations to obtain the crack growth resistance curves and ductile fracture toughness of the cracks in bi-material interface regions with different work hardening mismatches.…”

“…For simulating this process, the damage mechanics model, such as the Gurson-Tvergaard-Needleman (GTN) model [24][25][26] was developed. This model has been widely used in simulating ductile crack growth and fracture resistance behavior for different specimens [27], material interfaces [17,27] and similar metal joints [28][29][30][31][32]. The fracture resistance curves of a dissimilar metal welded joint has also been simulated using the GTN model by authors [12].…”

An experimental investigation of local fracture resistance and crack growth paths in a dissimilar metal welded joint

“…In most cases, the assessment results are potentially unsafe. A recent study [30] has shown that the resistance to crack initiation and growth is greatly affected by the heterogeneity of the weldment, and the importance of the HAZ for fracture behavior of welded joints was also emphasized. Therefore, in the integrity assessment for the DMWJ structure, it is recommended to obtain and use local mechanical and fracture resistance properties of all regions of the joint if the complex local mismatch situation is a concern.…”

Local fracture resistance behavior of interface regions in a dissimilar metal welded joint

“…For simulating this process, the damage mechanics model, such as the Gurson-Tvergaard-Needleman (GTN) model [17][18][19] was developed. This model has been widely used in simulating the ductile crack growth and fracture resistance behavior for different specimens [20], material interfaces [20,21] and similar metal welded joints [22][23][24][25][26]. The fracture resistance curves of a DMWJ also have been simulated using the GTN model by authors [10].…”