UX = Displacement in the X-direction
UY = Displacement in the Y-direction
UZ = Displacement in the Z-direction
URES = Resultant displacement
RFX = Reaction force in the X-direction
RFY = Reaction force in the Y-direction
RFZ = Reaction force in the Z-axis
RFRES = Resultant reaction force
EPSX = X Normal strain
EPSY = Y Normal strain
EPSZ = Z Normal strain
GMXY = Shear strain in Y direction on YZ plane
GMXZ = Shear strain in Z direction on YZ plane
GMYZ = Shear strain in Z direction on XZ plane
ESTRN = Equivalent strain
SEDENS = Strain energy density
ENERGY = Total strain energy
E1 = Normal strain in the first principal direction
E2 = Normal strain in the second principal direction
E3 = Normal strain in the third principal direction
Equivalent strain (ESTRN) is defined as:
ESTRN=2 [(e1+e2)/3] (1/2)
Where:
e1 = 0.5 [(EPSX-e*)2 + (EPSY-e*)2 + (EPSZ-e*)2],
e2 = 0.5 [(GMXY)2 + (GMXZ)2 + (GMYZ)2] / 4,
e* = (EPSX + EPSY + EPSZ) / 3
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
The following quantities do not use reference geometry:
P1 = 1st principal stress (largest)
P2 = 2nd principal stress
P3 = 3rd principal stress
VON = von Mises stress
INT = Stress intensity = P1 - P3
ERR = Energy Norm Error (available for element stresses only)
CP = Contact pressure
Principal Stresses
Stress components depend on the directions in which they are calculated. For certain coordinate axis rotations, shear stresses vanish. The remaining three normal stress components are called principal stresses. The directions associated with principal stresses are called the principal directions.
Von Mises or Equivalent Stresses
The von Mises or equivalent stress is a stress quantity calculated from stress components. While the von Mises stress at a node does not uniquely define the state of stress at that node, it provides adequate information to assess the safety of the design for many ductile materials.
Unlike stress components, the von Mises stress has no direction. It is fully defined by magnitude with stress units. The von Mises stress is used by failure criteria to assess failure of ductile materials.
The von Mises stress is computed from the six stress components as follows:
VON = {0.5 [(SX -SY)2 + (SX-SZ)2 + (SY-SZ)2] + 3(TXY2 + TXZ2 + TYZ2)}(1/2)
Or equivalently, from the three principal stresses,
VON = {0.5 [(P1 - P2)2 + (P1 - P3)2 + (P2 - P3)2]}(1/2)
By default, directions X, Y, and Z refer to the global coordinate system. If you choose a reference geometry, these directions refer to the selected reference entity.
Displacement components
Strain components
Elemental and nodal stresses
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