Stress dependent stiffness for the contact law based on Chang et al. (1989). More...

#include <stiffness.hpp>

Inheritance diagram for micromechanical::core::ChangStiffness< T >:

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Collaboration diagram for micromechanical::core::ChangStiffness< T >:

Public Member Functions
Eigen::Matrix< T, 3, 3 >	elasticStiffness (const int idx, T fn, const StateVariable< T > &sv0, StateVariable< T > &sv) override
	Calculate the elastic stiffness matrix.
Public Member Functions inherited from micromechanical::core::ContactLawBase< T >
	ContactLawBase (const std::unordered_map< std::string, T > &props={})
	constructor
virtual	~ContactLawBase ()=default
	destructor
virtual std::vector< std::string >	symmetricContactScalars () const
	Symmetric contact scalar variables.
virtual std::vector< std::string >	symmetricContactVectors () const
	Symmetric contact vector variables.
virtual void	initialize (StateVariable< T > &sv)
	initialize the contact law
T	frictionCoefficient (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv) const
	calculate the friction coefficient combined with different criteria
Eigen::Matrix< T, 3, 3 >	forceDisplacement (const int idx, Eigen::Matrix< T, 3, 1 > &ddisp, Eigen::Matrix< T, 3, 3 > &Ke, const StateVariable< T > &sv0, StateVariable< T > &sv)
	integrate the force-displacement relation
virtual T	CSL (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv) const
	calculate the critical state line
virtual T	yieldFunction (const int idx, const T fn, const T fr, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Yield function for elastoplastic contact laws.
Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic >	yieldFunctions (const int idx, const Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic > &fn, const Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic > &fr, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Calculate yield function for multiple times.
Eigen::Matrix< T, 3, 1 >	dfdforce0 (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Derivative of the yield function with respect to the force.
virtual Eigen::Matrix< T, 3, 1 >	dfdforce (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Derivative of the yield function with respect to the force.
virtual T	potentialFunction (const int idx, const T fn, const T fr, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Potential function for elastoplastic contact laws.
Eigen::Matrix< T, 3, 1 >	dgdforce0 (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Derivative of the potential function with respect to the force.
virtual Eigen::Matrix< T, 3, 1 >	dgdforce (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Derivative of the potential function with respect to the force.
virtual Eigen::Matrix< T, 3, 1 >	plasticModulus0 (const int idx, const Eigen::Matrix< T, 3, 1 > &dgdforce, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Plastic modulus for elastoplastic contact laws.
virtual T	plasticModulus (const int idx, const Eigen::Matrix< T, 3, 1 > &dgdforce, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Plastic modulus for elastoplastic contact laws, including dgdforce.
T	plasticModulus1 (const int idx, const Eigen::Matrix< T, 3, 1 > &dgdforce, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Plastic modulus for elastoplastic contact laws, including dgdforce.
virtual void	updateHardeningVariables (const int idx, const T dlambda, const Eigen::Matrix< T, 3, 1 > &ddispp, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Update the hardening variables.
virtual void	yieldFunctionCorrection (const int idx, const Eigen::Matrix< T, 3, 3 > &Ke, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Yield surface correction to keep the force state on the yield surface.
virtual void	maintainYieldSurface (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const Eigen::Matrix< T, 3, 1 > &dforce, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Revert state variables from elastic state to maintain the force state on the yield surface.

Additional Inherited Members
Public Attributes inherited from micromechanical::core::ContactLawBase< T >
std::string	name = "Undefined"
	Name of the contact law.
std::shared_ptr< Material< T > >	material
	Material properties.
int	nstatev_custom = 0
	Number of custom state variables.
bool	plastic_displacement = false
	Flag to save the plastic displacement in the state variables.
std::shared_ptr< Options< T > >	options = std::make_shared<Options<T>>()
	options for the micromechanical model
std::shared_ptr< DebugVariable< T > >	debugVariable = std::make_shared<DebugVariable<T>>()
	debug variable
int	_phase = 0
	index of the phase
int	_step = 0
	current step
int	_mixedLoad = 0
	number of mixed load steps
int	_integration = 0
	number of integration steps
int	_increment = 0
	number of contact increments
int	_plasticCorrection = 0
	number of contact plastic corrections
Protected Member Functions inherited from micromechanical::core::ContactLawBase< T >
virtual Eigen::Matrix< T, 3, 3 >	integrate (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const Eigen::Matrix< T, 3, 3 > &Ke, const StateVariable< T > &sv0, StateVariable< T > &sv)
	integrate the force-displacement contact law, with a number of increments.
Eigen::Matrix< T, 3, 3 >	increment (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const Eigen::Matrix< T, 3, 3 > &Ke, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Calculate one increment.
virtual Eigen::Matrix< T, 3, 3 >	stiffness (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const StateVariable< T > &sv0, StateVariable< T > &sv)=0
	calculate the elastoplastic stiffness matrix
virtual void	check (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const StateVariable< T > &sv0, StateVariable< T > &sv)
	check the convergence of the contact law
virtual void	preIntegration (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const StateVariable< T > &sv0, StateVariable< T > &sv)
	pre-processing before the integration
virtual void	postIntegration (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const StateVariable< T > &sv0, StateVariable< T > &sv)
	post-processing after the integration
virtual void	preIncrement (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const StateVariable< T > &sv0, StateVariable< T > &sv)
	pre-processing before the increment
virtual void	postIncrement (const int idx, const Eigen::Matrix< T, 3, 1 > &ddisp, const StateVariable< T > &sv0, StateVariable< T > &sv)
	post-processing after the increment
Eigen::Matrix< T, 3, 1 >	dfdforce1 (const int idx, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Derivative of the yield function with respect to the force.
Eigen::Matrix< T, 3, 1 >	dgdforce1 (const int idx, const Eigen::Matrix< T, 3, 1 > &dfdforce, const StateVariable< T > &sv0, StateVariable< T > &sv)
	Derivative of the potential function with respect to the force.

Detailed Description

template<typename T>
struct micromechanical::core::ChangStiffness< T >

Stress dependent stiffness for the contact law based on Chang et al. (1989).

Member Function Documentation

◆ elasticStiffness()

template<typename T>

Eigen::Matrix< T, 3, 3 > micromechanical::core::ChangStiffness< T >::elasticStiffness	(	const int	idx,
		T	fn,
		const StateVariable< T > &	sv0,
		StateVariable< T > &	sv )

inlineoverridevirtual

Calculate the elastic stiffness matrix.

Parameters

idx	index of the integration point
fn	normal force
sv0	initial state variable
sv	state variable

Returns: the elastic stiffness matrix

Implements micromechanical::core::ContactLawBase< T >.

References micromechanical::core::ContactLawBase< T >::material, micromechanical::core::ContactLawBase< T >::options, and constitutive::StateVariable< T >::scalars.

The documentation for this struct was generated from the following file:

include/micromechanical/core/stiffness.hpp

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ elasticStiffness()