engineering recuitment Vizag Steel MT Mechanical 2020 Test Series Strength of Materials Theory of Failure Maximum Shear Stress Theory
The principal stresses at a point in a critical section of a machine component are σ1 = 60 MPa; σ2 = 5 MPa and σ3 = -40 MPa. For the material of the component, the tensile yield strength is σyt = 200 MPa. According to the maximum shear stress theory, the factor of safety is
1
1.67
2
2.00
3
3.60
4
4.00