10.10 Stress_Model: Multi-Mechanism Elasto-PlasticModels (Geomaterials)

ISHIHARA

Material_name = ISHIHARA

m, nys(m), g1(m), b1(m), rhos(m), [ alf(m), rhof(m), xnf(m) ]

at(m), p1(m), xn(m), am(m), ar(m), ac(m)

fad(m), ptad(m), xmu0(m), sc(m)

s11(m), s22(m), s33(m), s12(m), s23(m), s31(m)

< for m = 1 , numat >

This constitutive model may be used with plane strain, axisymmetric and three dimensional options. Finite deformation effects are not accounted for by this model.

10.10.1 Material Properties Cards – (Numat sets) )

Card 1 Elastic Parameters

Note Variable Default Description

M [0] Material set number Numat

G(M) [0.0] Elastic shear modulus (solid phase)

B(M) [0.0] Elastic bulk modulus (solid phase)

RHOS(M) [0.0] Mass density (solid phase) per unit volume

(1) ALF(M) [0.0] Bulk modulus (fluid phase)

(1) RHOF(M) [0.0] Mass density (fluid phase) per unit volume

(1) XNF(M) [0.0] Porosity

Notes/

(1) Only applicable to porous media models.

Card 2 Yield Parameters

Note Variable Default Description

At(M) [0.0] Attraction 0.0

P1(M) [0.0] Reference mean normal stress 0.0

XN(M) [0.0] Power exponent

Am(M) [1.4E-3] Isotropic hardening parameter 0.0

Ar(M) [3.5E-5] Kinematic hardening parameter 0.0

Ac(M) [6.1E-4] Hardening parameter (liquefaction) 0.0

Card 3 Yield Parameters

Note Variable Default Description

FAD(M) [0.0] Friction angle in degrees

PTAD(M) [0.0] Phase transformation angle in degrees

XMU0(M) [0.0] Minimum value of dilatancy parameter

Sc(M) [3.5E-3] Index constant 0.0

Card 4 Initial Stresses

Note Variable Default Description

S(1,M) [0.0] Component 11 (SIGMA11)

S(2,M) [0.0] Component 22 (SIGMA22)

S(3,M) [0.0] Component 33 (SIGMA33)

S(4,M) [0.0] Component 12 (SIGMA12)

S(5,M) [0.0] Component 23 (SIGMA23)

S(6,M) [0.0] Component 31 (SIGMA31)

Notes/

(1) Tensile Stresses are positive.

Notes . .

Notes . .