Discussion
Match each quantity in List I with its definition in List II.
List I
A. Stress intensity factor
B. Fracture toughness
C. Stress ratio
D. Fatigue notch factor
List II
1. The critical value at which unstable fracture occurs
2. Y sigma root pi a, describing the crack tip field
3. The effective stress concentration in fatigue
4. Minimum stress over maximum stress
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
The pairing turns on which quantities are material properties and which describe a particular situation. The stress intensity factor \( Y\sigma\sqrt{\pi a} \) describes the crack tip field of a specific crack under a specific stress; the fracture toughness is the material’s critical value of it. The stress ratio is the ratio of the extremes, and the fatigue notch factor the effective concentration a notch produces in fatigue.
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