When a bolt encounters shock loading, its resilience must be evaluated to prevent failure at_______________?
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Answer: D. at the thread
Explanation
Shock loading delivers high-energy impacts that test the elastic resilience and impact strength of bolts. Thread roots act as severe geometric stress concentration points where stress levels peak sharply. Under high shock loads, these threaded stress concentrations make the threaded region the most likely failure site. Resilience is the ability of a fastener to store impact energy elastically without suffering permanent fracture. Stress concentration factors multiply nominal stresses at sharp internal corners like thread roots and fillets. Reducing shank diameter to match the thread root area improves bolt resilience and shock load survival.
The shank absorbs shock well when designed with reduced diameters, making it less vulnerable than thread roots. The head is forged with generous fillet radii to prevent high stress concentrations and failure at the base. Stating the bolt fails anywhere ignores the distinct mechanical weakness of sharp thread root stress raisers.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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