FINITE ELEMENT MODELLING OF A SMOOTH TENSILE SPECIMEN AND A COMPACT TENSION SPECIMEN WITH THE GURSON-TVEERGARD-NEEDLEMAN AND ROUSSELIER MICROMECHANICAL MODELS

摘要

This paper summarises CEA’s DMT contribution to the Phase II Round Robin organised by GKSS withinrnthe ESIS TC8 Committee on Numerical methods. The overall objective of this Round Robin is to investigaternthe ability of micro-mechanical models to predict ductile tearing in compact tension specimens made of thernGerman designation ferritic 22 NiMoCr 3 7 steel. The purpose of Task A1 is to identify critical micromechanicalrndamage parameters from FE analyses of a standard smooth tensile specimen. These parametersrnare then used in Task A2 to predict the JR curve for a 20% side grooved CT25 specimen. The simulatedrnresults are then compared with available experimental data in order to draw conclusions andrnrecommendations. Both the Rousselier and the Gurson-Tveergard-Needleman models, available in CEA’srnfinite element code CASTEM 2000, have been used.