Reply To: How to run a model at different temperatures using Johnson-Cook (J-C) MAT015 and MAT107 in LS-DYNA

[ssagar]

Thank you very much for your response Andreas Just to make sure I am understanding your reply. If the plastic work results in temperature softening (expressed as the homologous temperature raised to the power of m), do I not consider its effect if I change each parameter to correspond to the initial temperature it was tested at (an experimental tensile test was performed at each temperature)?
I do not have the J-C parameters at each test temperature nor do I have the MAT_224 properties at each test temperature. What I do have is the J-C parameters at a reference temperature, tr = 298 K.
The only ways of of changing the initial temperature (or in the experiment, test temperature) in LS- DYNA are:
(1) Mat107: has T0 = Initial Temperature: Structural only analysis.
(2) Mat015 and Use Initial_Temperature: Will require a structural and thermal analysis.
So far, MAT107 did not work out well. The impact energy actually decreased with temperature which is not in agreement with published data and experiment.
Coupled Structural and Thermal is taking very long using MAT015 and Initial Temperature.
Thank you again SS