GATE_AE_2027_MOCK_02_Q35 GATE 2027 Aerospace Engineering All-India Master Mock 02 (Compressible Aerodynamics & High-Speed Propulsion) MCQ · 1 Mark
Aerospace Structures • Aerospace Materials & Fatigue • S-N Curves, Miner's Rule & Stress Concentrations

According to Miner's cumulative damage hypothesis for fatigue life estimation, structural failure is predicted when the cycle ratio sum $\sum \frac{n_i}{N_i}$ equals:

(A) 1.0
(B) 0.5
(C) 2.0
(D) 0.0
Answer Key:
A

Step-by-Step Verified Solution

### Solution: Miner's Rule states that fatigue failure occurs when total cumulative damage $D = \sum \frac{n_i}{N_i} = 1.0$. Correct: A.
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