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fix(tet-based-metrics): compliance shear entries missing (+1 more) #25

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fix(tet-based-metrics): compliance shear entries missing (+1 more) #25

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8 changes: 4 additions & 4 deletions utils/tet_based_metrics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@

def get_strain_energy_of_element(ts, ti, particle_state_tensor, youngs):
"""Return the strain energy, volume, and center of a tetahedral element."""
voigt_stress = np.array([ts.x.x, ts.y.y, ts.z.z, ts.z.y, ts.z.x, ts.y.z])
voigt_stress = np.array([ts.x.x, ts.y.y, ts.z.z, ts.z.y, ts.z.x, ts.y.x])
invE = 1 / youngs
nu = 0.3 # poissons #TODO, CHNAGE THIS TO REFLECT POISSNS
D_inv = np.zeros((6, 6))
Expand All @@ -38,9 +38,9 @@ def get_strain_energy_of_element(ts, ti, particle_state_tensor, youngs):
D_inv[2][0] = -invE * nu
D_inv[2][1] = -invE * nu
D_inv[2][2] = invE
D_inv[3][3] = invE * (1.0 + nu)
D_inv[4][4] = invE * (1.0 + nu)
D_inv[5][5] = invE * (1.0 + nu)
D_inv[3][3] = 2 * invE * (1.0 + nu)
D_inv[4][4] = 2 * invE * (1.0 + nu)
D_inv[5][5] = 2 * invE * (1.0 + nu)

voigt_strain = D_inv @ voigt_stress

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