PEER NEES NEESit

• HOME
• USER
• DEVELOPER
• PROJECTS
• SUPPORT
• SITE MAP

• Dev Doc
• API
• Source
• Download
• Builds
• Bug Reports
• Message Board

J2ThreeDimensional.cpp Go to the documentation of this file. /* ****************************************************************** ** ** OpenSees - Open System for Earthquake Engineering Simulation ** ** Pacific Earthquake Engineering Research Center ** ** ** ** ** ** (C) Copyright 1999, The Regents of the University of California ** ** All Rights Reserved. ** ** ** ** Commercial use of this program without express permission of the ** ** University of California, Berkeley, is strictly prohibited. See ** ** file 'COPYRIGHT' in main directory for information on usage and ** ** redistribution, and for a DISCLAIMER OF ALL WARRANTIES. ** ** ** ** ****************************************************************** */ // $Revision: 1.6 $ // $Date: 2005/03/25 00:34:40 $ // $Source: /usr/local/cvs/OpenSees/SRC/material/nD/J2ThreeDimensional.cpp,v $ // Written: Ed "C++" Love // Do not ask Prashant about this code. He has no clue. // // J2ThreeDimensional isotropic hardening material class // // Elastic Model // sigma = K*trace(epsilion_elastic) + (2*G)*dev(epsilon_elastic) // // Yield Function // phi(sigma,q) = || dev(sigma) || - sqrt(2/3)*q(xi) // // Saturation Isotropic Hardening with linear term // q(xi) = simga_0 + (sigma_infty - sigma_0)*exp(-delta*xi) + H*xi // // Flow Rules // \dot{epsilon_p} = gamma * d_phi/d_sigma // \dot{xi} = -gamma * d_phi/d_q // // Linear Viscosity // gamma = phi / eta ( if phi > 0 ) // // Backward Euler Integration Routine // Yield condition enforced at time n+1 // // Send strains in following format : // // strain_vec = { eps_00 // eps_11 // eps_22 // 2 eps_01 // 2 eps_12 // 2 eps_20 } <--- note the 2 // // set eta := 0 for rate independent case // #include <J2ThreeDimensional.h> #include <Channel.h> #include <FEM_ObjectBroker.h> //static vectors and matrices Vector J2ThreeDimensional :: strain_vec(6) ; Vector J2ThreeDimensional :: stress_vec(6) ; Matrix J2ThreeDimensional :: tangent_matrix(6,6) ; //null constructor J2ThreeDimensional :: J2ThreeDimensional( ) : J2Plasticity( ) { } //full constructor J2ThreeDimensional :: J2ThreeDimensional( int tag, double K, double G, double yield0, double yield_infty, double d, double H, double viscosity ) : J2Plasticity( tag, ND_TAG_J2ThreeDimensional, K, G, yield0, yield_infty, d, H, viscosity ) { } //elastic constructor J2ThreeDimensional :: J2ThreeDimensional( int tag, double K, double G ) : J2Plasticity( tag, ND_TAG_J2ThreeDimensional, K, G ) { } //destructor J2ThreeDimensional :: ~J2ThreeDimensional( ) { } //make a clone of this material NDMaterial* J2ThreeDimensional :: getCopy( ) { J2ThreeDimensional *clone; clone = new J2ThreeDimensional( ) ; //new instance of this class *clone = *this ; //asignment to make copy return clone ; } //send back type of material const char* J2ThreeDimensional :: getType( ) const { return "ThreeDimensional" ; } //send back order of strain in vector form int J2ThreeDimensional :: getOrder( ) const { return 6 ; } //get the strain and integrate plasticity equations int J2ThreeDimensional :: setTrialStrain( const Vector &strain_from_element) { strain.Zero( ) ; strain(0,0) = strain_from_element(0) ; strain(1,1) = strain_from_element(1) ; strain(2,2) = strain_from_element(2) ; strain(0,1) = 0.50 * strain_from_element(3) ; strain(1,0) = strain(0,1) ; strain(1,2) = 0.50 * strain_from_element(4) ; strain(2,1) = strain(1,2) ; strain(2,0) = 0.50 * strain_from_element(5) ; strain(0,2) = strain(2,0) ; this->plastic_integrator( ) ; return 0 ; } //unused trial strain functions int J2ThreeDimensional :: setTrialStrain( const Vector &v, const Vector &r ) { return this->setTrialStrain( v ) ; } int J2ThreeDimensional :: setTrialStrainIncr( const Vector &v ) { static Vector newStrain(6); newStrain(0) = strain(0,0) + v(0); newStrain(1) = strain(1,1) + v(1); newStrain(2) = strain(2,2) + v(2); newStrain(3) = 2.0*strain(0,1) + v(3); newStrain(4) = 2.0*strain(1,2) + v(4); newStrain(5) = 2.0*strain(2,0) + v(5); return this->setTrialStrain(newStrain); } int J2ThreeDimensional :: setTrialStrainIncr( const Vector &v, const Vector &r ) { return this->setTrialStrainIncr(v); } //send back the strain const Vector& J2ThreeDimensional :: getStrain( ) { strain_vec(0) = strain(0,0) ; strain_vec(1) = strain(1,1) ; strain_vec(2) = strain(2,2) ; strain_vec(3) = 2.0 * strain(0,1) ; strain_vec(4) = 2.0 * strain(1,2) ; strain_vec(5) = 2.0 * strain(2,0) ; return strain_vec ; } //send back the stress const Vector& J2ThreeDimensional :: getStress( ) { stress_vec(0) = stress(0,0) ; stress_vec(1) = stress(1,1) ; stress_vec(2) = stress(2,2) ; stress_vec(3) = stress(0,1) ; stress_vec(4) = stress(1,2) ; stress_vec(5) = stress(2,0) ; return stress_vec ; } //send back the tangent const Matrix& J2ThreeDimensional :: getTangent( ) { // matrix to tensor mapping // Matrix Tensor // ------- ------- // 0 0 0 // 1 1 1 // 2 2 2 // 3 0 1 ( or 1 0 ) // 4 1 2 ( or 2 1 ) // 5 2 0 ( or 0 2 ) int ii, jj ; int i, j, k, l ; for ( ii = 0; ii < 6; ii++ ) { for ( jj = 0; jj < 6; jj++ ) { index_map( ii, i, j ) ; index_map( jj, k, l ) ; tangent_matrix(ii,jj) = tangent[i][j][k][l] ; } //end for j } //end for i return tangent_matrix ; } //send back the tangent const Matrix& J2ThreeDimensional :: getInitialTangent( ) { // matrix to tensor mapping // Matrix Tensor // ------- ------- // 0 0 0 // 1 1 1 // 2 2 2 // 3 0 1 ( or 1 0 ) // 4 1 2 ( or 2 1 ) // 5 2 0 ( or 0 2 ) int ii, jj ; int i, j, k, l ; this->doInitialTangent(); for ( ii = 0; ii < 6; ii++ ) { for ( jj = 0; jj < 6; jj++ ) { index_map( ii, i, j ) ; index_map( jj, k, l ) ; tangent_matrix(ii,jj) = initialTangent[i][j][k][l] ; } //end for j } //end for i return tangent_matrix ; } //this is mike's problem int J2ThreeDimensional :: setTrialStrain(const Tensor &v) { return -1 ; } int J2ThreeDimensional :: setTrialStrain(const Tensor &v, const Tensor &r) { return -1 ; } int J2ThreeDimensional :: setTrialStrainIncr(const Tensor &v) { return -1 ; } int J2ThreeDimensional :: setTrialStrainIncr(const Tensor &v, const Tensor &r) { return -1 ; } const Tensor& J2ThreeDimensional :: getTangentTensor( ) { return rank4 ; } //jeremic@ucdavis.edu 22jan2001const Tensor& J2ThreeDimensional :: getStressTensor( ) //jeremic@ucdavis.edu 22jan2001{ //jeremic@ucdavis.edu 22jan2001 return rank2 ; //jeremic@ucdavis.edu 22jan2001} //jeremic@ucdavis.edu 22jan2001 //jeremic@ucdavis.edu 22jan2001const Tensor& J2ThreeDimensional :: getStrainTensor( ) //jeremic@ucdavis.edu 22jan2001{ //jeremic@ucdavis.edu 22jan2001 return rank2 ; //jeremic@ucdavis.edu 22jan2001} Generated on Mon Oct 23 15:05:14 2006 for OpenSees by  1.5.0

---

opensees-support @ berkeley.edu

Supported by the National Science Foundation

©2006, UC Regents