Examples with Matrix6d maspack.matrix.Matrix6d used on opensource projects

Example 1 with Matrix6d

use of maspack.matrix.Matrix6d in project artisynth_core by artisynth.

the class LinearMaterialCache method addInitialStiffness.

/**
 * Computes and stores the initial stiffness K0 and force f0 terms
 * @param e   element
 * @param mat linear material
 */
public void addInitialStiffness(FemElement3d e, FemMaterial mat) {
    SolidDeformation def = new SolidDeformation();
    def.setAveragePressure(0);
    def.setF(Matrix3d.IDENTITY);
    def.setR(Matrix3d.IDENTITY);
    // compute stiffness matrix
    Matrix6d D = new Matrix6d();
    IntegrationPoint3d[] ipnts = e.getIntegrationPoints();
    IntegrationData3d[] idata = e.getIntegrationData();
    for (int k = 0; k < ipnts.length; k++) {
        IntegrationPoint3d pt = ipnts[k];
        IntegrationData3d dt = idata[k];
        double dv0 = dt.myDetJ0 * pt.getWeight();
        if (dt.myScaling != 1) {
            dv0 *= dt.myScaling;
        }
        Matrix3d Q = dt.myFrame == null ? Matrix3d.IDENTITY : dt.myFrame;
        Vector3d[] GNx0 = pt.updateShapeGradient(dt.myInvJ0);
        // compute tangent matrix under zero stress
        mat.computeTangent(D, SymmetricMatrix3d.ZERO, def, Q, null);
        FemNode3d[] nodes = e.getNodes();
        for (int i = 0; i < nodes.length; i++) {
            for (int j = 0; j < nodes.length; j++) {
                FemUtilities.addMaterialStiffness(K0[i][j], GNx0[i], D, GNx0[j], dv0);
            }
        }
    }
    // initial RHS
    Vector3d tmp = new Vector3d();
    FemNode3d[] nodes = e.getNodes();
    for (int i = 0; i < nodes.length; i++) {
        tmp.setZero();
        for (int j = 0; j < nodes.length; j++) {
            K0[i][j].mulAdd(tmp, nodes[j].getRestPosition(), tmp);
        }
        f0[i].set(tmp);
    }
}

Example 2 with Matrix6d

use of maspack.matrix.Matrix6d in project artisynth_core by artisynth.

the class LinearMaterialCache method addInitialStiffness.

/**
 * Computes and stores the initial stiffness K0 and force f0 terms
 * @param e   element
 * @param mat linear material
 */
public void addInitialStiffness(FemElement3d e, AuxiliaryMaterial mat) {
    SolidDeformation def = new SolidDeformation();
    def.setAveragePressure(0);
    def.setF(Matrix3d.IDENTITY);
    def.setR(Matrix3d.IDENTITY);
    // compute stiffness matrix
    Matrix6d D = new Matrix6d();
    IntegrationPoint3d[] ipnts = e.getIntegrationPoints();
    IntegrationData3d[] idata = e.getIntegrationData();
    for (int k = 0; k < ipnts.length; k++) {
        IntegrationPoint3d pt = ipnts[k];
        IntegrationData3d dt = idata[k];
        double dv0 = dt.myDetJ0 * pt.getWeight();
        if (dt.myScaling != 1) {
            dv0 *= dt.myScaling;
        }
        Vector3d[] GNx0 = pt.updateShapeGradient(dt.myInvJ0);
        // compute tangent matrix under zero stress
        mat.computeTangent(D, SymmetricMatrix3d.ZERO, def, pt, dt, null);
        FemNode3d[] nodes = e.getNodes();
        for (int i = 0; i < nodes.length; i++) {
            for (int j = 0; j < nodes.length; j++) {
                FemUtilities.addMaterialStiffness(K0[i][j], GNx0[i], D, GNx0[j], dv0);
            }
        }
    }
    // initial RHS
    Vector3d tmp = new Vector3d();
    FemNode3d[] nodes = e.getNodes();
    for (int i = 0; i < nodes.length; i++) {
        tmp.setZero();
        for (int j = 0; j < nodes.length; j++) {
            K0[i][j].mulAdd(tmp, nodes[j].getRestPosition(), tmp);
        }
        f0[i].set(tmp);
    }
}

Example 3 with Matrix6d

use of maspack.matrix.Matrix6d in project artisynth_core by artisynth.

the class NeoHookeanMaterial method main.

public static void main(String[] args) {
    NeoHookeanMaterial mat = new NeoHookeanMaterial();
    SolidDeformation def = new SolidDeformation();
    Matrix3d Q = new Matrix3d();
    def.setF(new Matrix3d(1, 3, 5, 2, 1, 4, 6, 1, 2));
    Matrix6d D = new Matrix6d();
    SymmetricMatrix3d sig = new SymmetricMatrix3d();
    mat.setYoungsModulus(10);
    mat.computeStress(sig, def, Q, null);
    mat.computeTangent(D, sig, def, Q, null);
    System.out.println("sig=\n" + sig.toString("%12.6f"));
    System.out.println("D=\n" + D.toString("%12.6f"));
}

Example 4 with Matrix6d

use of maspack.matrix.Matrix6d in project artisynth_core by artisynth.

the class OgdenMaterial method main.

public static void main(String[] args) {
    OgdenMaterial mat = new OgdenMaterial();
    SolidDeformation def = new SolidDeformation();
    Matrix3d Q = new Matrix3d();
    def.setF(new Matrix3d(1.1, 0.1, 0.2, 0.3, 0.8, 0.23, 0.3, 0.1, 1.5));
    Matrix6d D = new Matrix6d();
    SymmetricMatrix3d sig = new SymmetricMatrix3d();
    // double[] alpha = {2.0, 2.0, 2.0, 2.0, 2.0, 2.0};
    // double[] mu = {200.0, 0.0, 0.0, 0.0, 0.0, 0.0};
    mat.computeStress(sig, def, Q, null);
    System.out.println("sig=\n" + sig.toString("%12.6f"));
    mat.computeTangent(D, sig, def, Q, null);
    System.out.println("D=\n" + D.toString("%12.6f"));
}

Example 5 with Matrix6d

use of maspack.matrix.Matrix6d in project artisynth_core by artisynth.

the class FungMaterial method main.

public static void main(String[] args) {
    FungMaterial mat = new FungMaterial();
    RotationMatrix3d R = new RotationMatrix3d();
    R.setRpy(1, 2, 3);
    SolidDeformation def = new SolidDeformation();
    Matrix3d Q = new Matrix3d();
    def.setF(new Matrix3d(1, 3, 5, 2, 1, 4, 6, 1, 2));
    Q.set(R);
    Matrix6d D = new Matrix6d();
    SymmetricMatrix3d sig = new SymmetricMatrix3d();
    // mat.computeStress (sig, pt, dt, null);
    // System.out.println ("sig=\n" + sig.toString ("%12.6f"));
    // mat.computeTangent (D, sig, pt, dt, null);
    // System.out.println ("D=\n" + D.toString ("%12.6f"));
    mat.computeStress(sig, def, Q, null);
    System.out.println("sig=\n" + sig.toString("%12.6f"));
    mat.computeTangent(D, sig, def, Q, null);
    System.out.println("D=\n" + D.toString("%12.6f"));
}