Structural Application Constitutive Laws

List of constitutive laws in Structural Application

The constitutive models and constitutive laws are mathematical formulas based on thermodynamic laws aimed at predicting the behavior or response from one or more materials. The computation internal variables and mapping of tensor spaces are typical operations performed on them.

In general, a constitutive law is defined using various parameters that define the evolution of internal variables used in the model. The most common are:

A yield function that lets us know the domain of elastic material. A constitutive model may have one or more combinations of sueprficies fluence, it depends both know the material. An example of the same mohr is Coulomb's surface, which is expressed in six functions as defined inteseccion the yield strength of material.

A function of softening or hardening . Functions that define the post-peak response of the material. They can be linear In general, a constitutive law is defined using various parameters that define the evolution of internal variables used in the model. The most common are:

The parameters to define a yield surface are: a) the yield function b) flow rate: Associate or Associate c) Status: Plane Stress, Plane Strain, Full TrID.

Shown below a Python script which creates the object yield function and softening function.

Fluency_1   = EnergyYieldFunction (myState.Plane_Stress).
Fluency_2   = VonMissesYieldFunction (myState.Plane_Stress, myPotencialPlastic.Associated).
Fluency_3   = DruckerPragerYieldFunction (myState.Plane_Stress).
fluency_4   = ModifiedMorhCoulombYieldFunction (myState.Plane_Strain, myPotencialPlastic.Not_Associated).
fluency_5   = RankineYieldFunction (myState.Plane_Strain).
print fluency_1.
# Function to use Softening.
behavior_1 = ExponentialSoftening ().
behavior_2 = LinearSoftening ().
print behavior_1

Among the most common is Hook's law or theory of elasticity, Theory of plasticity and damage models. Combinations of them can be creating, doing more complex formulation.

Isotropic: Models of elasticity in 2 dimensions (Plane Stress) and three dimensions. Being known as Isotropic2D and Isotropic3D. Only the parameters required are Young's modulus and Poisson ratio.

Simple Damage Model: Models of Damage in 2 dimensions (Plane Stress) and three dimensions. They are known as Isotropic_Damage and Isotropic_Damage_3D. The properties of the materials it need are:

• Young Modulus,
• Poisson Ratio,
• Fracture Energy.
• Fluency Criteria (The Energy Yield Function),
• Softening Behavior (Linear or Exponential).

Simple Damage Model: Models of Damage in 2 dimensions (Plane Stress) and three dimensions. They are known as Isotropic_Damage and Isotropic_Damage_3D. The properties of the materials it need are:

• Young Modulus,
• Poisson Ratio,
• Fracture Energy.
• Fluency Criteria (The Energy Yield Function),
• Softening Behavior (Linear or Exponential).

Plasticty: Models of plasticity in 2 dimensions (Plane Stress and Plane Strain ) and three dimensions. They are known as Plasticity_2D and Plasticity_3D. The properties of the materials it need are:

• Young Modulus,
• Poisson Ratio,
• Yield Stress.
• Plastic Modulus.
• Fluency Criteria (The Energy Yield Function),
• Softening Behavior (Linear or Exponential).

Summary

• Isotropic2D()
• Isotropic3D()
• Isotropic_Damage()
• Isotropic_Damage3D()
• Plasticity_2D()
• Plasticity_3D()

List of Constitutive Law

List of flux