1. What does fatigue analysis predict?
Static failure The number of cycles to failure under cyclic loading Natural frequencies Temperature distribution
2. What is an S-N curve?
Stress vs. strain curve Stress amplitude vs. number of cycles to failure curve Load vs. displacement curve Temperature vs. time curve
3. What is the 'endurance limit'?
The maximum static stress The stress level below which a material can endure infinite cycles without fatigue failure The yield strength The ultimate strength
4. What is 'stress amplitude' in fatigue?
Maximum stress (Maximum stress - Minimum stress) / 2 Mean stress Von Mises stress
5. What is 'mean stress' in fatigue?
(Maximum stress + Minimum stress) / 2 Stress amplitude Von Mises stress Principal stress
6. What is Miner's Rule?
A stress calculation method A cumulative damage rule: Σ(nᵢ/Nᵢ) = 1 A material model A mesh refinement technique
7. What is 'high-cycle fatigue'?
Fatigue with large plastic strains Fatigue with predominantly elastic strains and long life (>10⁴ cycles) Static failure Thermal fatigue
8. What is 'low-cycle fatigue'?
Fatigue with predominantly elastic strains Fatigue with significant plastic strains and short life (<10⁴ cycles) Static failure Creep
9. What is a 'stress concentration factor' (Kₜ)?
The ratio of maximum stress to nominal stress at a geometric discontinuity The fatigue life The material strength The load factor
10. Which factor does NOT affect fatigue life?
Surface finish Stress amplitude Material color Mean stress