*CRUSHABLE FOAM

Optional parameters

DEPENDENCIES

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

HARDENING

Set HARDENING=VOLUMETRIC (default) to specify the volumetric hardening model.

Set HARDENING=ISOTROPIC to specify the isotropic hardening model.

Data lines to define the crushable foam plasticity model with volumetric hardening (HARDENING=VOLUMETRIC)

First line

$k = σ_{c}^{0} / p_{c}^{0}$ , yield stress ratio for compression loading; $0 < k < 3$ . Enter the ratio of initial yield stress in uniaxial compression to initial yield stress in hydrostatic compression.
$k_{t} = p_{t} / p_{c}^{0}$ , yield stress ratio for hydrostatic loading; $k_{t} \geq 0$ . Enter the ratio of yield stress in hydrostatic tension to initial yield stress in hydrostatic compression, given as a positive value. The default value is 1.0.
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 the crushable foam parameters on temperature and other predefined field variables.

Data lines to define the crushable foam plasticity model with isotropic hardening (HARDENING=ISOTROPIC)

First line

$k = σ_{c}^{0} / p_{c}^{0}$ , yield stress ratio for compression loading; $0 \leq k < 3$ . Enter the ratio of initial yield stress in uniaxial compression to initial yield stress in hydrostatic compression.
$ν_{p}$ , plastic Poisson's ratio; $- 1 < ν_{p} \leq 0.5$ .
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 the crushable foam parameters on temperature and other predefined field variables.