Materials & Constitutive Laws

Material nodes emit Kratos material definitions — a constitutive_law name plus a Variables block of material constants. They connect (via the material slot type) into lists and combiners that ultimately feed the solver's material import.

Directory: public/js/nodes/materials/

Fluids & helpers

Node	Type	Purpose
Newtonian	Materials/Newtonian	Newtonian fluid material.
Material (base)	—	Base class shared by material nodes.
Material Writer	Materials/Material Writer	Serialises the connected materials into the Kratos materials JSON.

Structural-mechanics constitutive laws

Directory: public/js/nodes/materials/structural_mechanics/

Node	Type	Family
Elastic Isotropic 3D	Materials/StructuralMechanics/ElasticIsotropic3D	Elastic
Linear Plane Strain	Materials/StructuralMechanics/LinearPlaneStrain	Elastic (2D)
Linear Plane Stress	Materials/StructuralMechanics/LinearPlaneStress	Elastic (2D)
Small Strain Isotropic Plasticity 3D	Materials/StructuralMechanics/SmallStrainIsotropicPlasticity3D	Plasticity
Finite Strain Isotropic Plasticity 3D	Materials/StructuralMechanics/FiniteStrainIsotropicPlasticity3D	Plasticity
Small Strain Isotropic Damage 3D	Materials/StructuralMechanics/SmallStrainIsotropicDamage3D	Damage
Small Strain Isotropic Damage Plane Strain	Materials/StructuralMechanics/SmallStrainIsotropicDamagePlaneStrain	Damage (2D)
Small Strain Isotropic Damage Plane Stress	Materials/StructuralMechanics/SmallStrainIsotropicDamagePlaneStress	Damage (2D)

Dynamic yield-surface properties

The plasticity and damage laws expose a YieldSurface combo, and the set of material-constant widgets updates dynamically to match the chosen surface. For the damage/plasticity laws the supported surfaces are VonMises, Tresca, Rankine, MohrCoulomb, ModifiedMohrCoulomb, DruckerPrager and SimoJu. Selecting a surface shows exactly the constants it requires — for example DENSITY, YOUNG_MODULUS, POISSON_RATIO, YIELD_STRESS, FRACTURE_ENERGY, SOFTENING_TYPE, and (for the Coulomb/Drucker-Prager surfaces) additional YIELD_STRESS_COMPRESSION, FRICTION_ANGLE, COHESION, DILATANCY_ANGLE.

On execute, the node emits:

{
  "model_part_name": "…",
  "properties_id": 0,
  "Material": {
    "constitutive_law": { "name": "SmallStrainIsotropicDamage3D<YieldSurface>" },
    "Variables": { "DENSITY": 0, "YOUNG_MODULUS": 0, "…": 0 },
    "Tables": {}
  }
}

The constitutive_law.name is composed from the base law and the selected yield surface, matching the Kratos constitutive-law naming convention.

Wiring materials

Materials flow into a List of Materials and are combined with model parts via Assign Material To ModelPart / Combine Materials & Modelparts IO nodes before reaching the solver's material import settings.