Which of the following expressions gives the normal strain in an axially loaded

Question

Which of the following expressions gives the normal strain in an axially loaded bar with a constant cross section and an axial force P applied at either end? pL/AE p0/AE L/AE pL/E Thermal effects cause_____ Opposite Identical Indeterminate Dependent For a solid circular shaft subject to a torque, the shear stress is_____at the center of the shaft and _____ at the outside of the shaft, varying Zero; at a maximum; parabolically Zero; at a maximum; linearly At a maximum; zero; parabolically At a maximum; zero; linearly at the center of in between.

Explanation / Answer

8. The answer is normal strain = P/AE as stress = YoungsModulus*strain and stress = P/A and Youngs Mod is E

9. Thermal effects cause identical stress in all directions

10. shear stress 0 at center, max at outer radius and vary linearly as shear stress = Tr/J where T is torsion, r is radius and J is torsional constant for the section

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