10.5 Stress_Model: Von Mises
Elasto-(Visco-)Plastic Model
MISES
Material_name = MISES
Material_set_number = mset , etc...
The yield function is of the following type:
with
where c (= cohesion) is a material constant, and = effective (Kirchhoff) stress. The following hyperelastic stored energy function with uncoupled volumetric and deviatoric parts is employed:
where
Note Variable Name Type Default Description
• Keywords Read Method
Material_set_number integer [1] Material set number Numat
(1) Hyperelastic_case integer [0] Hyperelastic free energy function:
Mass_density real [0.0] Mass density
Shear_modulus real [0.0] Shear modulus G
Bulk_modulus real [0.0] Bulk modulus B
Activation_time real [0.0] Time at which nonlinearities are activated.
Cohesion real [0.0] Cohesive coefficient c
Shear_strength real [0.0] Shear strength = c
Axial_strength real [0.0] Axial strength =
Relaxation_time real [0.0] Relaxation time constant > 0.0
0.0, Elastoplastic
> 0.0, Elastoviscoplastic
Variable_cohesion integer [0] Variable cohesion load time function number
(cont'd)
(cont'd)
Note Variable Name Type Default Description
(2) Initial_stress:
initial_stress_11 real [0.0] Component 11 ()
initial_stress_22 real [0.0] Component 22 ()
initial_stress_33 real [0.0] Component 33 ()
initial_stress_12 real [0.0] Component 12 ()
initial_stress_23 real [0.0] Component 23 ()
initial_stress_31 real [0.0] Component 31 ()
(3) Solid_mass_density real [0.0] Mass density (Solid Phase)
(3) Fluid_mass_density real [0.0] Mass density (Fluid Phase)
(3) Fluid_bulk_modulus real [0.0] Fluid bulk modulus
(3) Porosity real [0.0] Porosity
• List Read Method
Material data must follow in the form:
< m, IHyper(m), G(m), B(m), (m), (m), (m), (m), Pf(m) >
< c(m), (m), ltime_coh(m) >
< (Stres(i, m), i = 1, 6) >
< terminate with a blank record >.
Notes/
(1) Only applicable to finite deformation case (see Section 9.2.1).
(2) Tensile stresses are positive.
(3) Only applicable to porous media models.
Notes . .
Notes . .