For an elastic bar secured at its upper end and impacted by a falling weight at the bottom, the resulting shock load magnitude can be diminished by_________________?
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Answer: A. decreasing the cross-section area of’ bar
Explanation
Decreasing the cross-sectional area of an elastic bar increases its compliance and resilience. Higher resilience allows the bar to store more impact energy per unit volume elastically. This increased ability to stretch reduces the peak shock load magnitude from a falling weight. Shock load refers to the transient force experienced by a structure during a sudden impact event. Cross-sectional area directly affects the stiffness and deformation characteristics of an elastic bar. Strain energy capacity depends on distributing impact forces over a longer elongation distance.
Machine designers use slender bolts or reduced-shank fasteners to absorb shock loads effectively. Connecting rods and anchor bolts benefit from reduced shank areas to prevent fatigue failure. Understanding shock loading prevents structural damage in mechanical impact applications. Option B suggests increasing the cross-section area, which makes the bar stiffer and raises shock loads. Option C claims shock load remains unaffected, ignoring the mechanical benefit of bar compliance. Option D suggests dependency on other factors, whereas cross-section area directly impacts shock.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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