Discussion
Consider the following statements about mean stress:
1. A tensile mean stress reduces fatigue life at constant amplitude.
2. The Goodman relation corrects data for mean stress.
3. The stress ratio R is minus one for wholly tensile loading.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a tensile mean stress shortens the life at a given amplitude, and the Goodman relation is the standard correction for it. Statement 3 has the definition inverted - \( R = -1 \) is fully reversed loading, equal tension and compression. Wholly tensile loading gives a positive \( R \).
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