Design Engineer Interview Question:

Tell me why is stress considered important in a shaft?

Submitted by: Muhammad

The following types of stresses are prevalent in shafts:
☛ > At the outermost surface of the shaft the max shear stress occurs on the cross-section of the shaft.
☛ > At the surface of the shaft on the longitudinal planes through the axis of the shaft the maximum longitudinal shear stress occurs.
☛ > At 45 degrees to the maximum shearing stress planes at the surface of the shafts the major principal stress occurs. It equals the max shear stress on the cross section of the shaft.
☛ > For certain materials where the tensile and compressive strengths are lower in measure as compared to the shear strength, then the shaft designing should be carried out for the lowest strengths.
☛ > All these stresses are of significance as they play a role in governing the failure of the shaft. All theses stresses get generated simultaneously and hence should be considered for designing purposes
Submitted by: Muhammad