*POTENTIAL

Optional parameters

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of the stress potential coefficients in addition to temperature. If this parameter is omitted, it is assumed that the coefficients are constant or depend only on temperature. See Material Data Definition for more information.

POWER

This parameter applies only to Abaqus/Explicit analyses. It can be used only in conjunction with TYPE=BARLAT, BARLAT91, or HOSFORD.

Set this parameter equal to the exponent in the potential function.

TYPE

This parameter is used to define the stress potential function.

Set TYPE=BARLAT to specify nonquadratic anisotropic yield using the Barlat Yld2004-18p stress potential. This parameter setting is available only in Abaqus/Explicit.

Set TYPE=BARLAT91 to specify nonquadratic anisotropic yield using the Barlat Yld91 stress potential. This parameter setting is available only in Abaqus/Explicit.

Set TYPE=HILL (default) to specify quadratic anisotropic yield using the Hill stress potential.

Set TYPE=HOSFORD to specify nonquadratic isotropic yield using the Hosford criterion. This parameter setting is available only in Abaqus/Explicit.

Set TYPE=TRESCA to specify nonquadratic isotropic yield using the Tresca criterion. This parameter setting is available only in Abaqus/Explicit.

Data lines used to define stress ratios for the Hill stress potential (TYPE=HILL)

First line

$R_{11}$ .
$R_{22}$ .
$R_{33}$ .
$R_{12}$ .
$R_{13}$ .
$R_{23}$ .
Temperature.
First field variable.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than one)

Second field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of $R_{i j}$ on temperature and other field variables.

Data lines used to define coefficients for the Barlat Yld2004-18p stress potential (TYPE=BARLAT)

First line

$c_{1122}^{'}$ .
$c_{1133}^{'}$ .
$c_{2211}^{'}$ .
$c_{2233}^{'}$ .
$c_{3311}^{'}$ .
$c_{3322}^{'}$ .
$c_{1212}^{'}$ .
$c_{1313}^{'}$ .

Second line

$c_{2323}^{'}$ .
$c_{1122}^{"}$ .
$c_{1133}^{"}$ .
$c_{2211}^{"}$ .
$c_{2233}^{"}$ .
$c_{3311}^{"}$ .
$c_{3322}^{"}$ .
$c_{1212}^{"}$ .

Third line

$c_{1313}^{"}$ .
$c_{2323}^{"}$ .
Temperature.
First field variable.
Second field variable.
Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five)

Sixth field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of $c_{i j k l}^{'}$ and $c_{i j k l}^{"}$ on temperature and other field variables.

Data lines used to define coefficients for the Barlat Yld91 stress potential (TYPE=BARLAT91)

First line

$\bar{a}$ .
$\bar{b}$ .
$\bar{c}$ .
$\bar{f}$ .
$\bar{g}$ .
$\bar{h}$ .
Temperature.
First field variable.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than one)

Second field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of $\bar{a}$ , $\bar{b}$ , $\bar{c}$ , $\bar{f}$ , $\bar{g}$ , and $\bar{h}$ on temperature and other field variables.

*POTENTIAL

Optional parameters

Data lines used to define stress ratios for the Hill stress potential (TYPE=HILL)

Data lines used to define coefficients for the Barlat Yld2004-18p stress potential (TYPE=BARLAT)

Data lines used to define coefficients for the Barlat Yld91 stress potential (TYPE=BARLAT91)

There are no data lines associated with the Hosford stress potential (TYPE=HOSFORD) or the Tresca stress potential (TYPE=TRESCA)