The energy absorption capacity of a bolt subjected to shock can be improved by___________________?
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Answer: E. making shank diameter equal to core diameter of thread
Explanation
Reducing the shank diameter of a bolt to match the thread root diameter increases its compliance and energy absorption capacity. A slender shank distributes impact energy more uniformly along the entire fastener length rather than concentrating stress at the threads. Lowering the axial stiffness of the bolt allows it to stretch further under dynamic shock loads without exceeding yield limits. Shock absorption in fasteners depends heavily on the elastic resilience and strain energy storage capacity of the component. Resilience is defined as the capacity of a material to absorb energy when deformed elastically and release it upon unloading. Standard bolts with uniform shanks equal to the nominal outer thread diameter are excessively stiff and store less impact energy.
Option A is incorrect because correct tightening establishes preload but does not alter the fundamental shock absorption capacity of the fastener. Option B is wrong because increasing the shank diameter increases stiffness and decreases the elastic energy storage capability. Option C is incorrect because random grinding without engineering control can create surface notches that trigger fatigue failure.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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