ABAQUS umat routines next up previous contents
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ABAQUS umat routines

There are two interfaces to include ABAQUS umat routines: umat_abaqus is meant to include linear materials, umat_abaqusnl for nonlinear materials. For nonlinear materials the logarithmic strain and infinitesimal rotation are calculated, which slows down the calculation. Consequently, the nonlinear routine should only be used if necessary.

The linear routine is triggered by putting ABAQUS in front of the material name. The total length of the material name should not exceed 80 characters, consequently, 74 characters are left for the proper material name. For instance, if the material name in the ABAQUS routine is supposed to be ``WOOD'', you must specify ``ABAQUSWOOD'' in the CalculiX input file. The part ``ABAQUS'' is removed from the name before entering the umat routine.

The nonlinear routine is triggered by putting ABAQUSNL in front of the material name.

Notice that the following fields are not supported so far: sse, spd, scd, rpl, ddsddt, drplde, drpldt, predef, dpred, drot, pnewdt, celent, layer, kspt. If you need these fields, contact ``dhondt@t-online.de''. Furthermore, the following fields have a different meaning:


next up previous contents
Next: User-defined thermal material laws. Up: User-defined mechanical material laws. Previous: User-defined mechanical material laws.   Contents
guido dhondt 2012-10-06