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PROP_DAMAGE_MTSB

Material properties

Beta command

This command is in the beta stage and the format may change over time.

*PROP_DAMAGE_MTSB
"Optional title"
did, erode, noic
$a$, $b$, $\alpha$, $\varepsilon_{min}$

Parameter definition

Variable
Description
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 to max principal stress)
4 $\rightarrow$ node splitting at failure (Lode angle dependent crack direction)
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
$a$
Damage parameter
$b$
Damage parameter
$\alpha$
Damage parameter
$\varepsilon_{min}$
Minimum failure strain
default: 0

Description

This is the Moxnes-Teland-Skriudalen-Bergsrud failure criterion. The material will fail once the damage parameter, $D$, has evolved from 0 to 1. The damage growth rate is defined as:

$\displaystyle{\dot D = \frac{\dot\varepsilon_{eff}^p}{\mathrm{max}(\varepsilon_{min}, \varepsilon_f)}}$

where:

$\displaystyle{ \varepsilon_f = a + b \cdot p + \mathrm{H}(p) \cdot \alpha \cdot \dot{\varepsilon}_{eff}^p}$

$\mathrm{H}(p)$ is the Heaviside step function, defined as:

$\mathrm{H}(p) = \left\{ \begin{array}{cc} 0 & p \lt 0 \\ 1 & p \geq 0 \end{array} \right. $

The pressure, $p$, is defined as:

$p = -(\sigma_{xx} + \sigma_{yy} + \sigma_{zz})/3$