Abstract
Traditionally, combination of equivalent plastic strain and stress triaxiality parameters are taken into account when performing characterization of material ductility. Some well-established models like Lemaitre model, GTN based models and many others perform relatively well at high-triaxiality stress states but fail to give adequate answers to low-triaxiality states. In this work, three damage models are presented, applied and assessed to a cross-shaped component. Concerning material, AA5182-O, corresponding damage parameters are characterized by an inverse analysis procedure for each damage model.
Highlights
When manufacturing automotive body structures, sheet metal forming processes are commonly used, which include drawing, bending and stamping
Lemaitre model is implemented in a user material subroutine, which was developed to work in the FE package Abaqus
The GTN and Johnson-Cook models are implemented in FE package Abaqus, but in the case of Lemaitre model a user material subroutine was developed and implemented in the same FE program
Summary
When manufacturing automotive body structures, sheet metal forming processes are commonly used, which include drawing, bending and stamping During this processing the sheet metal can be subjected to large localized deformations with significant through-thickness necking in which 3D stress states develop and dictate the fracture event of the metal blank. In the framework of Continuous Damage Mechanics, a local damage model is implemented in Abaqus/Explicit code [3] and corresponding constitutive equations for the coupled model were developed and implemented. It is based on the Lemaitre’s ductile damage evolution law, fully coupled with Hill’s orthotropic plasticity criterion. Numerical simulations are presented and the corresponding results are compared with an experimental failure obtained for a cross-shaped component, in order to test and validate the different damage models and their ability for prediction of damage growth and fracture initiation
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