Problem

At a critical point in a machine part, the nonzero stress components are σxx = 120 MPa, σy...

At a critical point in a machine part, the nonzero stress components are σxx = 120 MPa, σyy = 50 MPa, and σxy = 50 MPa. The yield strength of the material is Y = 300 MPa. Determine the factor of safety in the design

a. based on the maximum shear-stress criterion


b. based on the octahedral shear-stress criterion.

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