Why distortional energy theory used for ductile materials?
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Yield point failure is considered for ductile materials because at this point it behaves as a plastic material.
In Tresca's yield criterion(MSST), the principle stresses are taken in each direction, maximum shear stress is calculated. This method is better for uniaxial loading, but it becomes complex for complex loadings and geometry.
In von Mises' yield criterion(Maximum distortion energy theory), every elastic member is considered as a spring which stores energy(distortion energy). This is easier and accurate because everything falls into a single equation thus avoiding complexity.
In Tresca's yield criterion(MSST), the principle stresses are taken in each direction, maximum shear stress is calculated. This method is better for uniaxial loading, but it becomes complex for complex loadings and geometry.
In von Mises' yield criterion(Maximum distortion energy theory), every elastic member is considered as a spring which stores energy(distortion energy). This is easier and accurate because everything falls into a single equation thus avoiding complexity.
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