Total strain energy (ENERGY)
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Total Strain Energy = ∑ [( SX * EPSX + SY * EPSY + SZ * EPSZ + TXY * GMXY + TXZ * GMXZ + TYZ * GMYZ) * Vol(i) * W(i) /2]
for i=1
, N int
N int are the integration points (or Gaussian points), W(i) is the weighted constant at integration point i, and
( SX = X normal stress, SY = Y normal stress,
SZ = Z normal stress,
TXY = Shear in Y direction on YZ plane,
TXZ = Shear in Z direction on YZ plane,
TYZ = Shear in Z direction on XZ plane
)
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