The photographs on the next page show a bicycle crank. The end of the crank has suffered a fatigue failure where the pedal was screwed into the crank (the pedal is missing). In the close-up photograph of the fracture, the bottom of the photograph corresponds to the outside (pedal side) of the crank arm. Answer the following questions:
a. Why do you think the failure was caused by fatigue?
b. Identify the fatigue fracture surface(s). Explain your choice.
c. Identify the final fast fracture surface(s). Explain your choice.
d. Where do you think the fatigue crack(s) initiated?
e. In your opinion, was the level of applied stress at final failure high, moderate, or low?
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