THEORY OF FAILURE--ONLY TRICKS very easy to remember

M.P.S.T- Brittle material
M.S.St.T-Ductile material
T.S.E.T- For hydrostatic stress
M.S.S.T- Ductile( over-safe)
M.D.E.T- Ductile (most prefered for ductile)
MDET and MSST both are very important because both are related to ductile material and we get confused.
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