Discussion
Match each rule or law in List I with what it predicts in List II.
List I
A. Miner's rule
B. Paris law
C. Goodman relation
D. Notch sensitivity
List II
1. Crack growth per cycle from the stress intensity range
2. Cumulative damage from blocks of cycles
3. How much of the elastic stress concentration is felt in fatigue
4. The effect of mean stress on allowable amplitude
Select the correct match.
Answer: C
Between them these cover the two halves of the subject: the first and last belong to stress-life analysis, and the Paris law to crack growth. Goodman bridges them by correcting constant-amplitude data to real mean stresses.
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