Learning Forum

[1614607336]

Hi, I need some help.

 Currently, I am conducting impact simulations at high temperatures using the Johnson-Cook material model (MAT015). The temperature in the simulation is higher than room temperature and distributed unevenly. I intend to perform the calculation using only structural analysis. Previously, I applied the temperature field obtained from thermal analysis to the model for structural analysis using* LOAD_THERMAL_BINOUT. However, the final results show that MAT015 fails to recognize the temperature field, and the calculation results are the same as those at room temperature.

Later, I found out that MAT015 recognizes temperature changes through the formula shown in the image. I have already input the specific heat capacity and density, but how should the internal energy and initial volume be added? I still want to use pure structural analysis, so could you tell me how to add an initial high-temperature field to the model?

[Dennis Chen]

Do you mean Initial_Temperature_set?  that's what one uses in a thermal analysis to set the initial temperature of the bodies but I struggle to see how that makes sense in a structural only analysis.

This type of problem makes a lot more sense if you just do is as a strongly coupled thermal mechanical problem.    It's very short duration anyways so it's not that expensive to run.