visco_aniso_damage

Description

This model implements a model of viscoplasticity with fully anisotropic coefficients and damage. The model accepts a number of mixed damage components based on scalar or tensorial variables, and any number of kinematic variables. The later must be chosen from a sub-set of the KINEMATIC objects described later in this chapter. The compatible models are indicated in the later section.

Syntax

***behavior visco_aniso_damage [ modifier ] [ **thermal_strain THERMAL_STRAIN \(~\,\) **C0 ELASTICITY \(~\,\) **H0 COEFFICIENT_MATRIX \(~\,\) **flow FLOW \(~\,\) **isotropic ISOTROPIC \(~\,\) **kinematic KINEMATIC \(~\,~\,~\,\) … [ **effective_stress ] [ **effective_operator ] [ **damage ANISOTROPIC_DAMAGE ] \(~\,~\,~\,\) … [ **closure ] [ \(t_{11}~~t_{22}~~t_{33}~~t_{12}~~t_{23}~~t_{31}~~\) ] [ **scalar_interaction (full | identity) ]

prefix	size	description	default
eto	T-2	strain tensor	yes
sig	T-2	Cauchy stress	yes
delta(i)	S	scalar damage variables	yes
d	T-2	tensor damage variable	yes
Y	T-2	driving force for tensorial damage	yes
evi	T-2	inelastic strain tensor	yes
evcum	S	inelastic strain equivalent	yes
alpha(i)	T-2	kinematic hardening variable	yes

Example

***behavior visco_aniso_damage
 **effective_stress
 **C0 orthotropic
    c11  154844.0
    c22  154844.0
    c33  203236.0
    c12  54844.0
    c23  49357.0
    c31  49357.0
    c44  50000.0 % 0.5(b11-b12)
    c55  50000.0
    c66  50000.0
 **H0 orthotropic
    c11 0.5
    c22 0.5
    c33 0.15
    c12 -0.3
    c23 -0.1
    c31 -0.1
    c44 0.4
    c55 0.35
    c66 0.35
 **flow norton
    n  12.0
    K  250.0
 **isotropic nonlinear
    R0  240.0
    Q   -70.0
    b   180.0
 **kinematic nonlinear X1
  *C orthotropic
   c11  15000.00  c12 0.0 c23 0.0 c31 0.0
   c22  15000.00
   c33  50000.00
   c44   7500.00 % 0.5(b11-b12)
   c55   7500.00
   c66   7500.00
 **kinematic nonlinear X2
  *C orthotropic
   c11  30000.00  c12 0.0 c23 0.0 c31 0.0
   c22  30000.00
   c33 100000.00
   c44  15000.00 % 0.5(b11-b12)
   c55  15000.00
   c66  15000.00
  *D diagonal 180.0
***return