artisynth.core.materials

Class NullMaterial

java.lang.Object

artisynth.core.materials.MaterialBase

artisynth.core.materials.FemMaterial

artisynth.core.materials.NullMaterial

All Implemented Interfaces:

ScalableUnits, java.lang.Cloneable, CompositeProperty, HasProperties, Clonable, Scannable

public class NullMaterial
extends FemMaterial

Field Summary

Fields inherited from class artisynth.core.materials.FemMaterial

myProps

Constructor Summary

Constructors

Constructor and Description
NullMaterial()

Method Summary

Modifier and Type	Method and Description
void	computeStress(SymmetricMatrix3d sigma, SolidDeformation def, Matrix3d Q, FemMaterial baseMat) Computes the strain tensor given the supplied deformation
void	computeTangent(Matrix6d D, SymmetricMatrix3d stress, SolidDeformation def, Matrix3d Q, FemMaterial baseMat) Computes the tangent stiffness matrix
boolean	isCorotated() Deformation is computed by first removing a rotation component (either explicit or computed from strain)
boolean	isInvertible() Returns true if this material is defined for a deformation gradient with a non-positive determinant.
boolean	isLinear() Linear stress/stiffness response to deformation, allows tangent to be pre-computed and stored.

Methods inherited from class artisynth.core.materials.FemMaterial

clone, equals, equals, getAllPropertyInfo, getSubClasses, getViscoBehavior, isIncompressible, isViscoelastic, registerSubclass, setViscoBehavior

Methods inherited from class artisynth.core.materials.MaterialBase

getProperty, getPropertyHost, getPropertyInfo, hasProperty, hasSymmetricTangent, isWritable, scaleDistance, scaleMass, scan, setPropertyHost, setPropertyInfo, tangentSymmetryChanged, updateMaterial, write

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullMaterial

public NullMaterial()

Method Detail

computeStress

public void computeStress(SymmetricMatrix3d sigma,
                          SolidDeformation def,
                          Matrix3d Q,
                          FemMaterial baseMat)

Description copied from class: FemMaterial

Computes the strain tensor given the supplied deformation

Specified by:

computeStress in class FemMaterial

Parameters:

sigma - strain tensor, populated

def - deformation information, includes deformation gradient and pressure

Q - coordinate frame specifying directions of anisotropy

baseMat - underlying base material (if any)

computeTangent

public void computeTangent(Matrix6d D,
                           SymmetricMatrix3d stress,
                           SolidDeformation def,
                           Matrix3d Q,
                           FemMaterial baseMat)

Description copied from class: FemMaterial

Computes the tangent stiffness matrix

Specified by:

computeTangent in class FemMaterial

Parameters:

D - tangent stiffness, populated

stress - the current stress tensor

def - deformation information, includes deformation gradient and pressure

Q - coordinate frame specifying directions of anisotropy

baseMat - underlying base material (if any)

isInvertible

public boolean isInvertible()

Description copied from class: FemMaterial

Returns true if this material is defined for a deformation gradient with a non-positive determinant.

Overrides:

isInvertible in class FemMaterial

isLinear

public boolean isLinear()

Description copied from class: FemMaterial

Linear stress/stiffness response to deformation, allows tangent to be pre-computed and stored.

Overrides:

isLinear in class FemMaterial

Returns:

true if linear response

isCorotated

public boolean isCorotated()

Description copied from class: FemMaterial

Deformation is computed by first removing a rotation component (either explicit or computed from strain)

Overrides:

isCorotated in class FemMaterial

Returns:

true if material is corotated