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A component cycles between \( 20 \) and \( 100 \) MPa. Its stress ratio is

  • A.0.8
  • B.-0.2
  • C.0.2
  • D.5.0

Answer: C

Correct answer: 0.2

\[ R = \frac{20}{100} = 0.2. \] Both stresses are tensile, so the cycle never crosses zero and the ratio is positive. A positive stress ratio means a tensile mean stress, which is the less favourable condition.

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