iso.c

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/*
%M This modules contains the ISOTROPIC material sub-class methods and 
   definitions
%a Joao Luiz Elias Campos.
%d September 2nd, 1998.
%r $Id: iso.c,v 1.1 2004/06/22 05:29:58 joaoluiz Exp $
%w (C) COPYRIGHT 1995-1996, Eduardo Nobre Lages.
   (C) COPYRIGHT 1997-1998, Joao Luiz Elias Campos.
   All Rights Reserved
   Duplication of this program or any part thereof without the express
   written consent of the author is prohibited.

   Modificacao: 28/04/2005    Alexandre A. Del Savio
     Foram substituídas todas as alocações dinâmicas feitas com malloc 
     por calloc.

*/

/*
** ------------------------------------------------------------------------
** Global variables and symbols:
*/
#include <stdio.h>
#include <stdlib.h>

#include "load.h"
#include "elm.h"
#include "material.h"
#include "node.h"
#include "rio.h"


/* Parent methods
 */
void MaterialTimeStep( sMaterial *, double * );
void MaterialDensity ( sMaterial *, double * );

/*
** ------------------------------------------------------------------------
** Local variables and symbols:
*/

/*
%T ISOTROPIC material data definition
*/
typedef struct _isodata
{
 double E;             /* Young modulos       */
 double Nu;            /* Poisson coefficient */
} sIsoData;


/*
** ------------------------------------------------------------------------
** Local functions:
*/


/*
** ------------------------------------------------------------------------
** Subclass methods:
*/
static void IsotropicNew        ( int, sMaterial ** );
static void IsotropicFree       ( sMaterial * );
static void IsotropicRead       ( sMaterial * );
static void IsotropicEParameter ( sMaterial *, double * );
static void IsotropicNuParameter( sMaterial *, double * );
static void IsotropicCMatrix    ( sMaterial *, double [6][6] );
static void IsotropicCPSMatrix  ( sMaterial *, double [6][6] ); 


/*
%F This method allocates memory for a ISOTROPIC material and fills its 
   data with the specific values.
%i Material label (number)
%o Material descriptor.
*/
static void IsotropicNew( int label, sMaterial **mat )
{
 sIsoData *data = 0L;

/* Get memory for the material descriptor
 */
 (*mat) = (sMaterial *)calloc(1, sizeof(sMaterial));

/* Get memory for the ISOTROPIC material data
 */
 data = (sIsoData *)calloc(1, sizeof(sIsoData));

/* Fill ISOTROPIC material data
 */
 data->E   = 0.0;
 data->Nu  = 0.0;

/* Fill material descriptor
 */
 (*mat)->type  = ISOTROPIC;
 (*mat)->label = label;
 (*mat)->Gamma = 0.0;
 (*mat)->Lambda = 0.0;
 (*mat)->data  = (void *)data;

/* Add to the material list
 */
 MatList[label-1] = (*mat);

} /* End of IsotropicNew */


/*
%F This method frees the ISOTROPIC material data for a given material.
%i Material descriptor.
*/
static void IsotropicFree( sMaterial *mat )
{
 sIsoData *data = 0L;

/* Get ISOTROPIC material data
 */
 data = (sIsoData *)mat->data;

/* Release allocated memory
 */
 free( data );

/* Reset material data
 */
 mat->data = 0L;

} /* End of IsotropicFree */


/*
%F This method reads the ISOTROPIC material information.
%i Material descriptor.
*/
static void IsotropicRead( sMaterial *mat )
{
 sIsoData *data = 0L;
 double    e, nu;

/* Get the material data
 */
 data = (sIsoData *)mat->data;

/* Read the material parameters
 */
 fscanf( nf, "%lf %lf", &e, &nu );

/* Fill material information
 */
 data->E  = e;
 data->Nu = nu;

} /* End of IsotropicRead */


/*
%F
*/
static void IsotropicEParameter( sMaterial *mat, double *e )
{
 sIsoData *data = 0L;

/* Get material descriptor
 */ 
 data = (sIsoData *)mat->data;

/* Get Young modules parameters
 */
 (*e) = data->E;

} /* End of IsotropicEParameter */


/*
%F
*/
static void IsotropicNuParameter( sMaterial *mat, double *nu )
{
 sIsoData *data = 0L;

/* Get material descriptor
 */ 
 data = (sIsoData *)mat->data;

/* Get Poisson coefficient parameters
 */
 (*nu) = data->Nu;

} /* End of IsotropicNuParameter */


/*
%F This function computes the material constitutive matrix
*/
static void IsotropicCMatrix( sMaterial *mat, double cm[6][6] )
{
 int       i, j;
 sIsoData *data = 0L;
 double    e, nu;

/* Intialize matrix
 */
 for( i = 0; i < 6; i++ )
  for( j = 0; j < 6; j++ )
   cm[i][j] = 0.0;

/* Get material descriptor
 */
 data = (sIsoData *)mat->data;

/* Get element parameters
 */
 e  = data->E;
 nu = data->Nu;

/* Compute matrix elements
 */
 if( NDof == 3 ) {
  cm[0][0] =
  cm[1][1] =
  cm[2][2] = (e*(1.0-nu))/((1.0+nu)*(1.0-(2.0*nu)));
  cm[3][3] =
  cm[4][4] =
  cm[5][5] = (e*(1.0-(2.0*nu)))/(2.0*(1.0+nu)*(1.0-(2.0*nu)));
  cm[0][1] =
  cm[0][2] =
  cm[1][2] =
  cm[1][0] =
  cm[2][0] =
  cm[2][1] = (e*nu)/((1.0+nu)*(1.0-(2.0*nu)));
 }
 else {
  cm[0][0] = cm[1][1] = (e * (1.0 - nu)) / ((1.0 + nu) * (1.0 - (2.0 * nu)));
  cm[0][1] = cm[1][0] = (e * nu) / ((1.0 + nu) * (1.0 - (2.0 * nu)));
  cm[2][2] = e / (2.0 * (1.0 + nu));
 }
 
} /* End of IsotropicCMatrix */

static void IsotropicCPSMatrix( sMaterial *mat, double cm[6][6] )
{
 int       i, j;
 sIsoData *data = 0L;
 double    e, nu;

/* Intialize matrix
 */
 for( i = 0; i < 6; i++ )
  for( j = 0; j < 6; j++ )
   cm[i][j] = 0.0;

/* Get material descriptor
 */
 data = (sIsoData *)mat->data;

/* Get element parameters
 */
 e  = data->E;
 nu = data->Nu;

/* Compute matrix elements
 */
 cm[0][0] = cm[1][1] = e / (1.0 - nu * nu);
 cm[0][1] = cm[1][0] = (e *nu)/ (1.0 - nu * nu);
 cm[2][2] = (e * (1.0 - nu)) / (2.0 * (1.0 - nu * nu));
 
 
} /* End of IsotropicCPSMatrix */


/*
** ------------------------------------------------------------------------
** Public functions:
*/

/*
%F This function initializes the sub-class "ISOTROPIC".
*/
void IsotropicInit( void );
void IsotropicInit( void )
{
/* Initialize ISOTROPIC material sub-class
 */
 MatClass[ISOTROPIC].new       = IsotropicNew;
 MatClass[ISOTROPIC].free      = IsotropicFree;
 MatClass[ISOTROPIC].read      = IsotropicRead;
 MatClass[ISOTROPIC].epar      = IsotropicEParameter;
 MatClass[ISOTROPIC].nupar     = IsotropicNuParameter;
 MatClass[ISOTROPIC].cmatrix   = IsotropicCMatrix;
 MatClass[ISOTROPIC].updatestr = 0L;
 MatClass[ISOTROPIC].updatepar = 0L;
 MatClass[ISOTROPIC].timestep  = MaterialTimeStep;
 MatClass[ISOTROPIC].density   = MaterialDensity;
 MatClass[ISOTROPIC].vstrain   = 0L;
 MatClass[ISOTROPIC].cpsmatrix = IsotropicCPSMatrix;
 
} /* End of IsotropicInit */


/* =======================================================  End of File  */

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