Volumetric Creep Swelling

Isotropic

For tabular definition, you specify the volumetric swelling data in tabular form. For user-subroutine based definition you specify the volumetric swelling behavior in the user subroutine.

Table 1. Volumetric swelling data
Input Data	Description
Volumetric strain rate	Volumetric swelling strain rate, ${\dot{\bar{ϵ}}}^{s w}$ .
Use temperature-dependent data	Specify material parameters that depend on temperature. A Temperature field appears in the data table.
Number of field variables	Specifies material parameters that depend on one or more independent field variables. A Field column appears in the data table.

Anisotropic

For tabular definition you specify both (i) volumetric swelling behavior, and (ii) anisotropic swelling ratios, in tabular form. For user-subroutine based definition you specify the volumetric swelling behavior in the user subroutine, and anisotropic swelling ratios in tabular form.

Table 2. Volumetric swelling data
Input Data	Description
Volumetric strain rate	Volumetric swelling strain rate, ${\dot{\bar{ϵ}}}^{s w}$ .
Use temperature-dependent data	Specify material parameters that depend on temperature. A Temperature field appears in the data table.
Number of field variables	Specifies material parameters that depend on one or more independent field variables. A Field column appears in the data table.

Table 3. Anisotropic Swelling Ratios
Input Data	Description
r11	Anisotropic swelling ratio, $r_{11}$ .
r22	Anisotropic swelling ratio, $r_{22}$ .
r33	Anisotropic swelling ratio, $r_{33}$ .
Use temperature-dependent data	Specify material parameters that depend on temperature. A Temperature field appears in the data table.
Number of field variables	Specifies material parameters that depend on one or more independent field variables. A Field column appears in the data table.