11.3.3 Tension Softening USRTEN

If USRTEN is specified in table 'MATERI' [§6.1.2.1], then subroutine USRTEN must be supplied to set up the appropriate softening parameter. This subroutine is particularly used to specify ambient influence (temperature, concentration, maturity) and time dependency.

    (Fortran)

      SUBROUTINE USRTEN( usrkey, te, co, ma, ti, sof )

usrkey

is the user-supplied keyword from input table 'MATERI'. This can be used to model various functions within one subroutine.

sof

is the softening parameter, depending on the used softening model [§6.1.2]. For linear and multilinear tension softening, sof is the ultimate strain $\varepsilon_{{\mathrm{u}}}^{{\mathrm{cr}}}$ . For nonlinear tension softening, sof is the fracture energy G_f .