MAT_UNDETONATED_EXPLOSIVE
Material properties
*MAT_UNDETONATED_EXPLOSIVE
"Optional title"
mid, $\rho$, $E$, $\nu$, ., ., eosid
$A$, $B$, $n$, $c$, $\dot{\varepsilon}_0$, $p_{det}$, $t_{det}$, $\alpha_{det}$
"Optional title"
mid, $\rho$, $E$, $\nu$, ., ., eosid
$A$, $B$, $n$, $c$, $\dot{\varepsilon}_0$, $p_{det}$, $t_{det}$, $\alpha_{det}$
Parameter definition
Variable
Description
mid
Unique material identification number
$\rho$
Density
$E$
Young's modulus
$\nu$
Poisson's ratio
.
Not used
.
Not used
eosid
Equation-of-state ID
$A$
Initial yield strength
$B$
Hardening parameter
$n$
Hardening exponent
$c$
Strain rate hardening parameter
$\dot{\varepsilon}_0$
Reference strain rate
$p_{det}$
Threshold detonation pressure
$t_{det}$
Detonation activiation time
$\alpha_{det}$
Pressure sensitivity exponent
Description
This is an elasto-plastic material model that is used to predict the detonation onset in explosive materials.
$\displaystyle{\sigma_y = \left( A + B(\varepsilon_{eff}^p)^n \right) \cdot \left( 1 + \frac{\dot{\varepsilon}_{eff}^p}{\dot{\varepsilon}_0} \right)^c}$
Detonation will occur when a damage variable $D$ (starting at $0$) reaches the value $1$.
$\displaystyle{ \dot{D} = \left[ \left( \frac{\mathrm{max}(0,p)}{p_{det}} \right)^{\alpha_{det}} - 1 \right] \cdot \frac{1}{t_{det}} }$
Note that $D$ shrinks at pressures below $p_{det}$, but it is not allowed to drop below $0$.
