11.3.4 Shear Retention USRSHR

The Maekawa model can be combined with user-supplied shear behavior. If you specify SHRCRV USER in the input data [§9.4.1.2], then you must also supply subroutine USRSHR to define the shear behavior.

    (Fortran)

      SUBROUTINE USRSHR( alp, nuv, usrval, nus, usrsta, nui,
     $                   usrind, jth, sig )

alp

contains both tangential (shear) strain components and normal (crack) strain components, for instance for solid elements: ( $\varepsilon_{{nn}}^{}$ , $\varepsilon_{{ss}}^{}$ , $\varepsilon_{{tt}}^{}$ , $\varepsilon_{{ns}}^{}$ , $\varepsilon_{{st}}^{}$ , $\varepsilon_{{nt}}^{}$ ).

usrval

are the user-specified material parameters which are input in the table 'MATERI' with the input item USRVAL.

usrsta

are the user-specified status variables which are input in the table 'MATERI' with the input item USRSTA.

usrind

are the user-specified indicators which are input in the table 'MATERI' with the input item USRIND.

jth

is the shear stress index: for instance for solid elements 4 is $\tau_{{ns}}^{}$ , 5 is $\tau_{{st}}^{}$ , 6 is $\tau_{{nt}}^{}$ .

sig

is the predicted (shear) stress component which may depend on both tangential strain components and normal strain components.