Crashbox under different temperatures

- November 22, 2023 at 10:54 pm
  
  Noah
  Subscriber
  
  Hello,
  I have tried to simulate the crash behavior of crash boxes under different temperatures.
  I am using the material model MAT_015. Unfortunately, the simulation does not show any significant differences between the different temperatures (in contrast to previous tests).
  For the thermal analysis I use
  - INITIAL TEMPERATURE
  - CONTROL_THERMAL_SOLVER
  - CONTROL_SOLUTION
  - CONTROL_THERMAL_TIMESTEP
  - T01_THERMAL_ISOTROPIC
  KEYWORDS
  *CONTROL_SOLUTION
  $# soln nlq isnan lcint lcacc ncdcf nocop
  2 0 0 100 0 1 0
  *CONTROL_THERMAL_SOLVER
  $# atype ptype solver - gpt eqheat fwork sbc
  1 0 11 8 1.0 1.0 0.0
  *CONTROL_THERMAL_TIMESTEP
  $# ts tip its tmin tmax dtemp tscp lcts
  0 0.5 0.001 0.0 0.0 1.0 0.5 0
  *MAT_THERMAL_ISOTROPIC
  $# tmid ro tgrlc tgmult tlat hlat
  1 0.0 0.0 0.0 0.0 0.0
  $# hc tc
  5.000000E8 0.0162
  *INITIAL_TEMPERATURE_SET
  $# nsid temp loc
  1 260.0 0
  Why does it show no differences when I change the INITIAL_TEMPERATURE?
  Am I using the wrong solver? Or the wrong T01 model?
  Regards
  Noah
- November 27, 2023 at 5:07 pm
  
  Jim Day
  Ansys Employee
  
  Set NEIPH=5 (if solids) or NEIPS=5 (if shells) in *DATABASE_EXTENT_BINARY to write out 5 extra history variables. The 5th such variable for MAT_015 is T – Troom. Check the value of that variable to confirm its initial value is the initial temperature per *INITIAL_TEMPERATURE minus TR in *MAT_015.