19) Which of these loads most often causes fatigue failure? b) Sustained Load d)

Question

19) Which of these loads most often causes fatigue failure? b) Sustained Load d) Cyclical Load a) Static Load c) Impact Load 20) Torsional forces on a shaft cause a) Shear stresses c) Normal stresses b) Shear Loads d) Axial Loads 21) Principle normal stresses are defined where b) The shear stress is O a) The normal stress is at max c) The shear stress is at max d) none of the above 22) Mohr's Circle helps us to find b) The difference between normal and shear stress a) The stresses at the given conditions c) The principle normal and shear stresses d) What the failure mode will be 23) Where will the stress concentration be equal to 1 a) Where the radius of the shaft is constant b) Where there is a fillet in the part ) Where something has been etched on the surface d) all of the above

Explanation / Answer

19) d) Cyclical Load

20) a) Shear stresses

21) b) The shear stress is 0

22) a) the stresses at the given conditions

24) d) all of the above

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