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LS-DYNA requires a consistent set of units to be used. All parameters in this manual are in SI units.


  • length [m]
  • mass [kg]
  • temperature [K]
  • time [sec]
  • pressure [Pa]

Mechanical units

  • density [kg/m3]
  • Modulus of elasticity [Pa]
  • yield stress [Pa]
  • coefficient of expansion [m/m K]

Thermal units

  • heat capacity [J/kg K]
  • thermal conductivity [W/m K]
  • heat generation rate [W/ m3]

See also the HowTo on consistent units