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ou A bar of steel has the minimum properties S,- 276 MPa, S,-413 MPa, and Su= 551 MPa. The bar is subjected to a steady torsional stress (r m) of 103 MPa and an alternating bending stress (oa ) of 172 MPa. Find the factor of safety guarding against a static failure, and either the factor of safety guarding against a fatigue failure or the expected life of the part. For the fatigue analysis use: (a) Modified Goodman criterion. (b) Gerber criterion. (c) ASME-elliptic criterion note // assume the Kr and Ks equal 1

A machine element is subjected to the following bi-axial state of stress; o = 80 MPa; o,= 20 MP%3; = 40 MPa. If the shear strength of the materials xy is 100 MPa, the factor of safety as per Tresca's maximum shear stress theory is (a) 1.0 (c) 2.5 (b) 2.0 (d) 3.3

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