#### PROP_DAMAGE_CL_ANISOTROPIC

###### Material properties
*PROP_DAMAGE_CL_ANISOTROPIC
"Optional title"
did, erode, noic
$W_{0}$, $W_{90}$, $W_{t}$
##### Parameter definition
VariableDescription
did Unique damage identification number
erode Element erosion flag
options:
0 $\rightarrow$ failed element is not eroded
1 $\rightarrow$ failed element is eroded
2 $\rightarrow$ node splitting at failure (crack plane orthogonal to max principal strain)
3 $\rightarrow$ node splitting at failure (crack plane orthogonal max principal stress)
noic Flag to turn off cracking along interface between different materials
options:
0 $\rightarrow$ material interface cracks are allowed
1 $\rightarrow$ material interface cracks are not allowed
$W_{0}$ Damage parameter for the rolling/extrusion direction
$W_{90}$ Damage parameter for the transverse direction
$W_{t}$ Damage parameter for the material thickness direction
##### Description

This is an anisotropic Cockcroft-Latham like failure criterion. The material will fail once the damage parameter, $D$, has evolved from 0 to 1.

$\displaystyle{ D = \displaystyle{\int_0^{\varepsilon_{eff}^p}} \frac{\mathrm{max}(0,\sigma_1)}{W_c} \mathrm{d}\varepsilon_{eff}^p}$

where $\sigma_1$ is the maximum principal stress. $W_c$ is a weighted ductility parameter and it depends on the loading direction:

$\displaystyle{ W_c = \sqrt{ W_0^2 \cos^2 \alpha_0 + W_{90}^2 \cos^2 \alpha_{90} + W_t^2 \cos^2 \alpha_t }}$

$\alpha_0$, $\alpha_{90}$ and $\alpha_t$ are the angles between the maximum principle stress and the material rolling/extrusion, transverse and thickness directions, respectively.

The initial material orientation is defined using either INITIAL_MATERIAL_DIRECTION, INITIAL_MATERIAL_DIRECTION_VECTOR or INITIAL_MATERIAL_DIRECTION_WRAP.