Accessing Abaqus Thermal Materials

Utility routine MATERIAL_LIB_HT returns heat fluxes, internal energy time derivative, volumetric heat generation rate, and their derivatives at the element material point.

The routine can be called only from Abaqus/Standard user subroutine UELMAT.

This page discusses:

See Also
UELMAT
In Other Guides
UELMAT

ProductsAbaqus/Standard

Utility Routine Interface

     dimension predef(npredef),dpredef(npredef),dtemdx(*),
    *         rhodUdg(*),flux(*),dfdt(*),dfdg(ndim,*),drpldt(*),    *         coords(3)
     ...

     call material_lib_ht(materiallib,rhoUdot,rhodUdt,rhodUdg,
    *       flux,dfdt,dfdg,rpl,drpldt,npt,dvmat,predef,
    *       dpredef,npredf,temp,dtemp,dtemdx,celent,coords)
     ...

Variables to Be Provided to the Utility Routine

materiallib

Variable containing information about the Abaqus material. This variable is passed into user subroutine UELMAT.

npt

Integration point number.

dvmat

Volume at the integration point.

predef

Array of interpolated values of predefined field variables at the integration point at the start of the increment.

dpredef

Array of increments of predefined field variables.

npredf

Number of predefined field variables, including temperature.

temp

Temperature at the integration point at the start of the increment, θ.

dtemp

Increment of temperature.

dtemdx

Spatial gradients of temperature, ∂⁡θ/∂⁡x, at the end of the increment.

celent

Characteristic element length.

coords

The array containing the original coordinates of this point.

Variables Returned from the Utility Routine

rhoUdot

Time derivative of the internal thermal energy per unit mass, U, multiplied by density at the end of increment.

rhodUdt

Variation of internal thermal energy per unit mass with respect to temperature multiplied by density evaluated at the end of the increment.

rhodUdg

Variation of internal thermal energy per unit mass with respect to the spatial gradients of temperature, ∂⁡U/∂⁡(∂⁡θ/∂⁡x), multiplied by density at the end of the increment.

flux

Heat flux vector, f, at the end of the increment.

dfdt

Variation of the heat flux vector with respect to temperature, ∂⁡f/∂⁡θ, evaluated at the end of the increment.

dfdg

Variation of the heat flux vector with respect to the spatial gradients of temperature, ∂⁡f/∂⁡(∂⁡θ/∂⁡x), at the end of the increment

rpl

Volumetric heat generation per unit time at the end of the increment.

drpldt

Variation of rpl with respect to temperature.