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main.cpp
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Fri, Jan 24, 14:04

main.cpp
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#include <HDF5pp.h>
#include <Eigen/Eigen>
#include <cppmat/cppmat.h>
#include <GooseFEM/GooseFEM.h>
#include <GooseMaterial/AmorphousSolid/LinearStrain/Elastic/Cartesian2d.h>
// -------------------------------------------------------------------------------------------------
using MatS = GooseFEM::MatS;
using MatD = GooseFEM::MatD;
using ColD = GooseFEM::ColD;
using vec = cppmat::cartesian2d::vector <double>;
using T2 = cppmat::cartesian2d::tensor2 <double>;
using T2s = cppmat::cartesian2d::tensor2s<double>;
using T2d = cppmat::cartesian2d::tensor2d<double>;
namespace GM = GooseMaterial::AmorphousSolid::LinearStrain::Elastic::Cartesian2d;
// =================================================================================================
class Quadrature
{
public:
T2s eps, epsdot, sig;
size_t nhard;
GM::Material hard, soft;
double Ebar, Vbar;
Quadrature(size_t nhard);
double density (size_t elem, size_t k, double V);
void stressStrain (size_t elem, size_t k, double V);
void stressStrainRate (size_t elem, size_t k, double V);
void stressStrainPost (size_t elem, size_t k, double V);
void stressStrainRatePost(size_t elem, size_t k, double V);
};
// -------------------------------------------------------------------------------------------------
Quadrature::Quadrature(size_t _nhard)
{
nhard = _nhard;
hard = GM::Material(100.,10.);
soft = GM::Material(100., 1.);
}
// -------------------------------------------------------------------------------------------------
double Quadrature::density(size_t elem, size_t k, double V)
{
return 1.0;
}
// -------------------------------------------------------------------------------------------------
void Quadrature::stressStrain(size_t elem, size_t k, double V)
{
if ( elem < nhard ) sig = hard.stress(eps);
else sig = soft.stress(eps);
}
// -------------------------------------------------------------------------------------------------
void Quadrature::stressStrainRate(size_t elem, size_t k, double V)
{
sig.zeros();
}
// -------------------------------------------------------------------------------------------------
void Quadrature::stressStrainPost(size_t elem, size_t k, double V)
{
Vbar += V;
if ( elem < nhard ) Ebar += hard.energy(eps) * V;
else Ebar += soft.energy(eps) * V;
}
// -------------------------------------------------------------------------------------------------
void Quadrature::stressStrainRatePost(size_t elem, size_t k, double V)
{
}
// =================================================================================================
int main()
{
// set simulation parameters
double T = 20. ; // total time
double dt = 1.e-2; // time increment
size_t nx = 40 ; // number of elements in both directions
double gamma = .05 ; // displacement step
// class which provides the mesh
GooseFEM::Mesh::Quad4::Regular mesh(nx,nx,static_cast<double>(nx),static_cast<double>(nx));
// reference node
size_t nodeRef = mesh.nodesRef();
// class which provides the constitutive response at each quadrature point
auto quadrature = std::make_shared<Quadrature>(nx*nx/4);
// class which provides the response of each element
using Elem = GooseFEM::Dynamics::Diagonal::LinearStrain::Quad4<Quadrature>;
auto elem = std::make_shared<Elem>(quadrature);
// class which provides the system and an increment
GooseFEM::Dynamics::Diagonal::Periodic<Elem> sim(
elem,
mesh.coor(),
mesh.conn(),
mesh.dofsPeriodic(),
dt,
0.0
);
// define update in macroscopic deformation gradient
T2 dFbar(0.);
dFbar(0,1) = gamma;
// update the displacement according to the macroscopic deformation gradient update
for ( size_t i = 0 ; i < sim.nnode ; ++i )
for ( size_t j = 0 ; j < sim.ndim ; ++j )
for ( size_t k = 0 ; k < sim.ndim ; ++k )
sim.u(i,j) += dFbar(j,k) * ( sim.x0(i,k) - sim.x0(nodeRef,k) );
// output variables
ColD Epot(static_cast<int>(T/dt)); Epot.setZero(); // potential energy
ColD Ekin(static_cast<int>(T/dt)); Ekin.setZero();
ColD t (static_cast<int>(T/dt)); t .setZero();
// loop over increments
for ( size_t inc = 0 ; inc < static_cast<size_t>(Epot.size()) ; ++inc )
{
// - compute increment
sim.velocityVerlet();
// - post: energy based on nodes
// -- store time
t(inc) = sim.t;
// -- kinetic energy
for ( size_t i = 0 ; i < sim.ndof ; ++i )
Ekin(inc) += .5 / sim.Minv(i) * std::pow( sim.V(i) , 2. );
// -- potential energy
quadrature->Ebar = 0.0;
quadrature->Vbar = 0.0;
sim.post();
Epot(inc) = quadrature->Ebar;
}
// write to output file
H5p::File f = H5p::File("example.hdf5");
f.write("/global/Epot",Epot );
f.write("/global/Ekin",Ekin );
f.write("/global/t" ,t );
f.write("/mesh/coor" ,mesh.coor());
f.write("/mesh/conn" ,mesh.conn());
f.write("/mesh/disp" ,sim.u );
return 0;
}

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