Command Default

Reference temperature is 0.0 degrees.

Notes

Defines the reference temperature for the thermal strain calculations in structural analyses and explicit dynamic analyses. Thermal strains are given by  α * (T - TREF), where α is the coefficient of thermal expansion. Input the strain via ALPX, ALPY, ALPZ (the secant or mean coefficient value), or CTEX, CTEY, CTEZ (the instantaneous coefficient value), or the thermal strain value (THSX, THSY, THSZ). T is the element temperature. If α is temperature-dependent, TREF should be in the range of temperatures you define using the MPTEMP command.

Reference temperatures may also be input per material by specifying a value on the MP material property command:

Only a constant (non-temperature-dependent) value is valid. The value input on the TREF command applies to all materials not having a specified material property definition.

To convert temperature-dependent secant coefficients of thermal expansion (SCTE) data (properties ALPX, ALPY, ALPZ) from the definition temperature to the reference temperature defined via a TREF (or MP,REFT) command, issue the MPAMOD command.

This command is also valid in PREP7.

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