Question:
The two statistical methods used for making a statistical estimate of the fatigue limit are
The two statistical methods used for making a statistical estimate of the fatigue limit are
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Fatigue limit is statistically determined due to material scatter.
Updated On: Jun 29, 2026
- Miner rule and Cumulative damage theory
- Probit analysis and Staircase method
- Goodman relation and Soderberg criterion
- Basquin equation and Coffin-Manson relation
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The Correct Option is B
Solution and Explanation
Concept:
Fatigue limit estimation requires statistical treatment because fatigue life shows scatter.
Step 1: Staircase method.
• sequential testing method
• load is increased/decreased based on failure/non-failure
• used to estimate fatigue limit
Step 2: Probit analysis.
• statistical regression technique
• used for probability of failure vs stress level
Step 3: Other options.
• Miner rule → cumulative damage (not statistical estimation)
• Goodman/Soderberg → mean stress correction
• Basquin/Coffin-Manson → life relations, not statistical estimation Final Answer: \[ \boxed{\text{Probit analysis and Staircase method}} \]
Step 1: Staircase method.
• sequential testing method
• load is increased/decreased based on failure/non-failure
• used to estimate fatigue limit
Step 2: Probit analysis.
• statistical regression technique
• used for probability of failure vs stress level
Step 3: Other options.
• Miner rule → cumulative damage (not statistical estimation)
• Goodman/Soderberg → mean stress correction
• Basquin/Coffin-Manson → life relations, not statistical estimation Final Answer: \[ \boxed{\text{Probit analysis and Staircase method}} \]
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