Engineering :: Strength Of Materials

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According to Von Mises theory, the elastic failure occurs

[A].	When the shear strain energy is least	[B].	When shear strain equals 50% of the value of tensile strain at elastic limit in a simple tension test
[C].	When the shear strain energy per unit volume in the stressed material equals shear strain energy per unit volume at the elastic limit in a simple tension test	[D].	None of the above

Answer: Option C