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

Abstract In this paper, the Gurson-Tvergraad-Needleman (GTN) model is used to study damage of stainless steel springs at high temperatures. The basic material and GTN parameters are determined from stress-strain curves tensile tests. Then evolution 300 °C 900 analyzed based on finite element simulations. results show that below 600 °C, change volume fraction holes in spring, along with increase load, has an obvious low growth stage, followed by a rapid stage. But above there only stable fracture positions predicted analyses agree experiments for round bars.