OCTAHEDRAL SHEARING STRESS THEORY
OCTAHEDRAL SHEARING STRESS THEORY According to this theory, the critical quantity is the shearing stress on the octahedral plane. The plane which is equally inclined to all the three principle axes is called the octahedral plane. τ oct = (1/3) [(σ 1 – σ 2 ) 2 + (σ 2 – σ 3 ) 2 + (σ 3 – σ 1 ) 2 ] 1/2 where, τ oct = octahedral shearing stress Failure is said to occur when τ oct = ((√2)/3) σ e This theory holds feasible for ductile materials and is similar to Von Mises theory.
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