Open AccessThermomechanical forming and crash simulations
Author(s) -
M. Abspoel,
M. E. Scholting,
Marcel Lansbergen
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/651/1/012044
Subject(s) - plasticity , materials science , hardening (computing) , strain hardening exponent , extrapolation , strain rate , ultimate tensile strength , finite element method , deformation (meteorology) , tensile testing , mechanics , structural engineering , composite material , engineering , mathematics , physics , mathematical analysis , layer (electronics)
With increasing possibilities and demands for FEM predictions, there is a need to get each input right. For example friction modelling, press kinematics, tool deformations are issues that are addressed more and more. FEM simulations including these advanced models require that each piece of the puzzle must be right. Description of the accurate thermomechanical plasticity behaviour is important for these simulations because press and tool deformations, friction behaviour and crashworthiness are depending on having the right forces and temperatures in your system. This thermomechanical plasticity behaviour consists of strain rate and temperature dependent hardening curves and a yield locus to scale these hardening curves for the different deformation modes. An accurate and easy to use yield locus which can be determined from only three tensile tests is Vegter 2017. The hardening behaviour consists of a static part and a strain rate and temperature dependent dynamic part. The static hardening behaviour can be determined with a tensile test and a biaxial test for the extrapolation to higher strains. The dynamic hardening behaviour can be determined with high strain rate tensile tests. An additive strain rate – temperature model is used to correct the necessary plasticity tests and prepare them for hardening fitting. With a strain rate jump test the validity of the additive model is proven. Comparison between FEM simulations and measurements for several practical deformation processes show a good prediction of the forces and temperatures of the thermomechanical plasticity model.