Question:
Fatigue data are commonly presented using
Fatigue data are commonly presented using
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Fatigue depends on cyclic variation, not just maximum stress.
Updated On: Jun 29, 2026
- Maximum stress only
- Mean stress and strain
- Minimum stress only
- Stress ratio and amplitude ratio
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The Correct Option is D
Solution and Explanation
Concept:
Fatigue behavior depends on cyclic loading parameters rather than a single stress value. Therefore, fatigue data are represented using stress ratios.
Step 1: Fatigue loading parameters.
Key fatigue parameters:
• Stress ratio: $R = \frac{\sigma_{min}}{\sigma_{max}}$
• Stress amplitude: $\sigma_a = \frac{\sigma_{max}-\sigma_{min}}{2}$
Step 2: Why these are used.
Fatigue failure depends on:
• cyclic range of stress
• mean stress effects
• amplitude variation Hence fatigue data are plotted using stress ratio and amplitude ratio. Final Answer: \[ \boxed{\text{Stress ratio and amplitude ratio}} \]
Step 1: Fatigue loading parameters.
Key fatigue parameters:
• Stress ratio: $R = \frac{\sigma_{min}}{\sigma_{max}}$
• Stress amplitude: $\sigma_a = \frac{\sigma_{max}-\sigma_{min}}{2}$
Step 2: Why these are used.
Fatigue failure depends on:
• cyclic range of stress
• mean stress effects
• amplitude variation Hence fatigue data are plotted using stress ratio and amplitude ratio. Final Answer: \[ \boxed{\text{Stress ratio and amplitude ratio}} \]
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