GATE ME 2019 Set 2 — Question 18
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Machine Design → Static & Dynamic Loading → Fatigue, S-N Diagram & Endurance
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Question
Endurance limit of a beam subjected to pure bending decreases with
Correct answer
(C) increase in the surface roughness and increase in the size of the beam
Solution
The endurance limit () of a component is affected by several modification factors:
1.Surface Finish Factor (): As surface roughness increases, the number of stress concentrators (micro-notches) increases, which reduces the endurance limit. Thus, decreases with an increase in surface roughness.
2.Size Factor (): Larger components have a higher statistical probability of containing a critical flaw within the highly stressed volume. Therefore, the endurance limit decreases as the size of the beam increases.
Consequently, the endurance limit decreases with an increase in surface roughness and an increase in size.Continue learning with Success Tracker
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