Machine Design - Fatigue
GATE Mechanical Engineering · 4 questions across 3 years (2018-2021) · 8% recurrence rate
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All 4 questions on Machine Design - Fatigue
The figure shows the relationship between fatigue strength (S) and fatigue life (N) of a material. The fatigue strength of the material for a life of 1000 cycles is 450 MPa, while its fatigue strength for a life of 10^6...
Endurance limit of a beam subjected to pure bending decreases with
During a high cycle fatigue test, a metallic specimen is subjected to cyclic loading with a mean stress of +140 MPa, and a minimum stress of -70 MPa. The R-ratio (minimum stress to maximum stress) for this cyclic loading...
Fatigue life of a material for a fully reversed loading condition is estimated from $\sigma_a = 1100N^{-0.15}$, where $\sigma_a$ is the stress amplitude in MPa and N is the failure life in cycles. The maximum allowable s...