Numerical investigation of crack growth in AISI type 316LN stainless steel weld joint using GTN damage model

Abstract

Ductile crack growth in austenitic 316LN stainless steel weld joint has been studied using FEA simulations with Gurson-Tvergaard-Needleman (GTN) damage model. The material specific GTN damage parameters are assessed and calibrated based on coupled experimental and numerical simulations for tensile and compact tension specimens. The influence of initial crack tip at various locations across the weld thickness has been analysed using CT geometry. The simulated results reveal that the crack propagates along the initial crack line for centrally located welds and deviates from the crack line for interfacial welds. The crack growth path for all cases is explained with damage parameters like equivalent plastic strain and void volume fraction.

Gurson-Tvergraad-Needleman model-based damage analyses of stainless steel springs at high temperature

“…Since its birth, many scholars have applied it to the ductile fracture analysis of metal materials. It uses the yield function to describe the yield behavior of materials [5] . The failure of materials is defined by volume fraction, and the relationship between plastic deformation and hole expansion is quantitatively described.…”