1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | foam-extend: Open Source CFD
4 \\ / O peration | Version: 3.2
5 \\ / A nd | Web: http://www.foam-extend.org
6 \\/ M anipulation | For copyright notice see file Copyright
7 -------------------------------------------------------------------------------
9 This file is part of foam-extend.
11 foam-extend is free software: you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation, either version 3 of the License, or (at your
14 option) any later version.
16 foam-extend is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
28 Stress return method similar to that described by a number of
30 Yamada, Y. et al. 1968. with Yoshimura, N. and Sakurai, T. Plastic
31 stress-strain matrix and its application for the solution of
32 elastic-plastic problems by the finite element method.
33 International Journal of Mechanical Science. vol. 10, p. 343-354.
35 Maneeratana, K. 2000. Development of the finite volume method for
36 non-linear structural applications.
38 This approach gives the stress rate explicitly as a function of
39 strain rates and instantaneous stresses
45 Aleksandar Karac Zenica/UCD
46 Rearranged by Philip Cardiff UCD
48 \*---------------------------------------------------------------------------*/
53 #include "plasticityStressReturn.H"
55 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
60 class constitutiveModel;
62 /*---------------------------------------------------------------------------*\
63 Class yamadaMises Declaration
64 \*---------------------------------------------------------------------------*/
68 public plasticityStressReturn
72 // Reference to constitutive model
73 constitutiveModel& constitutiveModel_;
76 volScalarField sigmaY_;
78 // Increment of plastic strain
79 volSymmTensorField DEpsilonP_;
81 // Increment of equivalent plastic strain
82 volScalarField DEpsilonPEq_;
84 // Total equivalent plastic strain
85 volScalarField epsilonPEq_;
87 // Active yielding flag
88 // 1.0 for active yielding
89 // 0.0 for fully elastic
90 // 0.0 < beta < 1.0 for step which are a combination of fully elastic
91 // and elastic-plastic
94 // Private Member Functions
96 //- Disallow default bitwise copy construct
97 yamadaMises(const yamadaMises&);
99 //- Disallow default bitwise assignment
100 void operator=(const yamadaMises&);
104 //- Runtime type information
105 TypeName("yamadaMises");
107 // Static data members
112 //- Construct from dictionary
116 constitutiveModel& constitutiveModel
122 virtual ~yamadaMises();
127 //- Correct the rheological model
128 virtual void correct();
130 //- Return slave friction value fraction
131 virtual const volSymmTensorField& DEpsilonP() const
136 //- Return slave friction value fraction
137 virtual void updateYieldStress();
139 //- Write law dictionary
140 virtual void writeDict(Ostream& os) const {};
144 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
146 } // End namespace Foam
148 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
152 // ************************************************************************* //