Wrench Fatigue Homework Problem If the wrench shown here is used on an assembly

Question

Wrench Fatigue Homework Problem If the wrench shown here is used on an assembly line for tightening bolts to 65 ft.lb. of torque, and the wrench material is AISI 1020 steel Q&T; 870 degree C, what is the factor of safety against fatigue failure? Assume: all fatigue correction factors are equal to one, the highest stress is at the joint between the handle and the "socket", and there is no stress concentration at the joint. Draw the load plot, stress plot, and appropriate fatigue diagram. If this wrench is used in a repair shop where it removes and replaces bolts requiring 100 ft.lb. of torque, how many bolts will the wrench be able to do? Draw the load plot, stress plot, and appropriate fatigue diagram.

Explanation / Answer

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