Von Mises Stress is the stress tensor is the equivalent hydrostatic pressure is the deviatoric stress
Invariants of Stress Invariants do not change values when coordinate system is rotated. The first invariant of the stress is The second invariant of the deviatoric stress is The third invariant of the deviatoric stress is the determinant.
Principal Stresses Eigenvalues of stress tensor (matrix) are principal stresses – All values are real – Order is 1:maximum, 2: intermediate, 3:minimum Associated eigenvectors are normal to face Use maximum principal stress for fracture 11 22 33 x y z
FE Post Processing Plotting – Includes displaced, contour, and scatter plots Campbell Diagram – Finds important resonances Goodman Diagram – Predicts high cycle fatigue life Fracture – Indicates failure due to crack propagation Yield – Establishes yield through the use of equivalent (Mises) stress Principal Stress – Aids in determining failure due to presence of flaws