Strain Components

EPSX Normal strain in the X-direction of the selected reference geometry
EPSY Normal strain in the Y-direction of the selected reference geometry
EPSZ Normal strain in the Z-direction of the selected reference geometry
GMXY Shear strain in the Y direction in the YZ-plane of the selected reference geometry
GMXZ Shear strain in the Z direction in the YZ-plane of the selected reference geometry
GMYZ Shear strain in the Z direction in the XZ-plane of the selected reference geometry
ESTRN Equivalent strain
SEDENS Strain energy density (a)
ENERGY Total strain energy (b)
E1 Normal strain in the first principal direction
E2 Normal strain in the second principal direction
E3 Normal strain in the third principal direction
Strain Type Used for nonlinear studies only
Total Total strain due to various effects
Plastic Nonrecoverable strain
Elastic Recoverable strain
Thermal Strain due to thermal effects
Creep Strain due to creep effects

Equivalent strain (ESTRN)

ESTRN=2 [(ε1+ε2)/3](1/2)

Where:

ε1 = 0.5 [(EPSX - ε*)2 + (EPSY - ε*)2 + (EPSZ - ε*)2]

ε2 = [(GMXY)2 + (GMXZ)2 + (GMYZ)2] / 4

ε* = (EPSX + EPSY + EPSZ) / 3

Total strain energy (ENERGY)

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 )

Strain energy density (SEDENS)

SEDENS = Total Strain Energy / Volume , Volume = ∑ [ Vol(i) * W(i)] , i =1, N int.