GATE ME 2017 Set 2 — Question 11
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Machine Design → Static & Dynamic Loading → Fatigue, S-N Diagram & Endurance
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Question
A machine component made of a ductile material is subjected to a variable loading with and . If the corrected endurance limit and the yield strength for the material are and , respectively, the factor of safety is ________
Correct answer
1.99 to 2.01
Solution
Given variable loading:
Mean stress ():Stress amplitude ():For a ductile material under variable loading, we can use the Soderberg or Goodman criteria. Since the mean stress , both criteria reduce to:Given :The factor of safety is .
Mean stress ():Stress amplitude ():For a ductile material under variable loading, we can use the Soderberg or Goodman criteria. Since the mean stress , both criteria reduce to:Given :The factor of safety is .
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