boermat Class Reference

#include <boermat.h>

Public Member Functions
	boermat (void)
void	changeparam (atsel &atm, vector &val)
void	derpotsigma (matrix &sig, matrix &dgds)
void	deryieldfsigma (matrix &sig, matrix &dfds)
double	give_consparam (long ipp, long ido)
void	giveirrstrains (long ipp, long ido, vector &epsp)
void	matstiff (matrix &d, long ipp, long ido)
void	nlstresses (long ipp, long im, long ido)
void	nonloc_nlstresses (long ipp, long im, long ido)
void	read (XFILE *in)
void	updateval (long ipp, long im, long ido)
double	yieldfunction (matrix &sig)
	~boermat (void)
Public Attributes
double	a
double	alpha
double	alpha1
double	alpha2
double	beta
double	beta1
double	c
	cohesion
double	delta
double	n
	exponent for smoothing
double	phi
	friction angle
double	psi
	dilation
strretalg	sra
	stress return algorithm

Detailed Description

This class implements Boer plasticity model, which is similar to Mohr-Coulomb but the singularities on the cone edges are removed by the smoothing. Smoothing is controled by the attribute n which has default valu 0.229.

Definition at line 15 of file boermat.h.

Constructor & Destructor Documentation

boermat ( void )

This constructor inializes attributes to zero values; exponent n is initialized with Groen constant.

Definition at line 18 of file boermat.cpp.

References c, n, phi, and psi.

~boermat ( void )

This destructor is only for the formal purposes.

Definition at line 28 of file boermat.cpp.

Member Function Documentation

void changeparam	(	atsel &	atm,
		vector &	val
	)

Definition at line 357 of file boermat.cpp.

References a, alpha, alpha1, alpha2, atsel::atrib, beta, beta1, c, delta, n, atsel::num, phi, and psi.

void derpotsigma	(	matrix &	sig,
		matrix &	dgds
	)

This function computes derivatives of plastic potential function with respect of vector sigma.

Parameters:

	sig	- stress tensor
	dgds	- matrix where the resulting derivatives are stored

Definition at line 170 of file boermat.cpp.

References alpha1, c, cmulm(), deviator(), and normedtensor().

void deryieldfsigma	(	matrix &	sig,
		matrix &	dfds
	)

This function computes derivatives of as-th yield function with respect of vector sigma.

Parameters:

	sig	- stress tensor
	dfds	- matrix where the resulting derivatives are stored

4.1.2002

Definition at line 104 of file boermat.cpp.

References addm(), alpha1, cmulm(), copym(), delta, deviator(), fillm(), Mp, n, second_invar(), subm(), third_invar(), and probdesc::zero.

Referenced by mechmat::dfdsigma(), and mechmat::dgdsigma().

double give_consparam	(	long	ipp,
		long	ido
	)

This function extracts consistency parametr gamma for the reached equilibrium state from the integration point other array.

Parameters:

	ipp	- integration point number in the mechmat ip array.
	ido	- index of internal variables for given material in the ipp other array

Definition at line 346 of file boermat.cpp.

References mechmat::ip, Mm, intpoints::ncompstr, and intpoints::other.

Referenced by mechmat::give_consparam().

void giveirrstrains	(	long	ipp,
		long	ido,
		vector &	epsp
	)

Function returns irreversible plastic strains.

Parameters:

	ipp	- integration point number in the mechmat ip array.
	ido	- index of the first internal variable for given material in the ipp other array
	epsp	- vector of irreversible strains

Returns vector of irreversible strains via parameter epsp

Definition at line 329 of file boermat.cpp.

References intpoints::eqother, mechmat::ip, Mm, and vector::n.

Referenced by mechmat::giveirrstrains().

void matstiff	(	matrix &	d,
		long	ipp,
		long	ido
	)

This function computes material stiffnes matrix.

Parameters:

	d	- allocated matrix structure for material stiffness matrix
	ipp	- integration point number
	ido	- index of internal variables for given material in the ipp other array

Definition at line 193 of file boermat.cpp.

References mechmat::elmatstiff(), Mm, Mp, probdesc::nlman, and nonlinman::stmat.

Referenced by mechmat::matstiff().

void nlstresses	(	long	ipp,
		long	im,
		long	ido
	)

This function computes stresses at given integration point ipp, depending on the reached strains. The cutting plane algorithm is used. The stress and the other attribute of given integration point is actualized.

Parameters:

	ipp	- integration point number in the mechmat ip array.
	im	- index of material type for given ip
	ido	- index of internal variables for given material in the ipp other array

Definition at line 218 of file boermat.cpp.

References cp, mechmat::cutting_plane(), intpoints::eqother, strretalg::give_err(), strretalg::give_ni(), strretalg::give_tsra(), mechmat::ip, Mm, intpoints::ncompstr, intpoints::other, sra, and intpoints::strain.

Referenced by mechmat::compnonloc_nlstresses(), and mechmat::computenlstresses().

void nonloc_nlstresses	(	long	ipp,
		long	im,
		long	ido
	)

This function computes stresses at given integration point ipp, depending on the reached averaged nonlocal strains. The cutting plane algorithm is used. The stress and the other attribute of given integration point is actualized.

Parameters:

	ipp	- integration point number in the mechmat ip array.
	im	- index of material type for given ip
	ido	- index of internal variables for given material in the ipp other array

Definition at line 266 of file boermat.cpp.

References cp, mechmat::cutting_plane(), intpoints::eqother, strretalg::give_err(), strretalg::give_ni(), strretalg::give_tsra(), mechmat::ip, Mm, intpoints::ncompstr, intpoints::nonloc, intpoints::other, sra, and intpoints::strain.

Referenced by mechmat::compnonloc_nlstresses().

void read ( XFILE * in )

This function reads material parameters from the opened text file given by the parameter in. Then it computes material constants alpha, alpha1, alpha2, beta and beta1

Parameters:

in

- pointer to the opned text file

Definition at line 42 of file boermat.cpp.

References a, alpha, alpha1, alpha2, beta, beta1, c, delta, n, phi, psi, strretalg::read(), sra, and xfscanf().

Referenced by mechmat::readmattype().

void updateval	(	long	ipp,
		long	im,
		long	ido
	)

This function updates values in the other array reached in the previous equlibrium state to values reached in the new actual equilibrium state.

Parameters:

	ipp	- integration point number in the mechmat ip array.
	im	- index of material type for given ip
	ido	- index of internal variables for given material in the ipp other array

Definition at line 309 of file boermat.cpp.

References intpoints::eqother, mechmat::givencompeqother(), mechmat::ip, Mm, n, and intpoints::other.

Referenced by mechmat::updateipvalmat().

double yieldfunction ( matrix & sig )

This function computes the value of yield functions.

Parameters:

sig

- stress tensor

Return values:

The

function returns value of yield function for the given stress tensor

25.3.2002