Bolted joints under shock loading: location where resilience must be considered to avoid failure A bolt under shock/impact may fail at a critical location due to energy absorption limits. Choose the location where design for resilience is crucial to prevent breakage.

Concept
Resilience is the energy absorbed per unit volume within the elastic range. Under shock/impact, the highest stress concentration in a bolt is typically at the thread root (small net area + notch effect), making it the most likely failure location if not properly designed.

Design note
To improve resilience and reduce peak stress at the thread, designers often use a reduced shank (to the core diameter) so the shank elastically stretches and load shares with threads, shifting peak stresses away from the root.

Final Answer
Thread