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Failure theories
QUESTION 2
2.1 Using both of the theories of elastic failures, calculate the factors of safety for
the following principal stress values at a point in a ductile material.
120MPa(T),100MPa(C), and 80MPa(T). The yield strength of the material
is 250 MPa .
2.2 A shaft must transmit a torque of 2.2kN.m and a bending moment of 1.8kN.m
Calculate the required shaft diameter using both failure criteria for ductile
materials. Use a factor of safety of 2 and a yielding strength of 280 MPa .