Fatigue cracks advance incrementally under cyclic loading. Changes or interruptions in loading can leave macroscopic bands marking successive crack-front positions, called beach marks. They are characteristic of fatigue, B. Microscopic striations and macroscopic beach marks describe different scales of evidence.
More Fatigue questions
GATE 2019 MT Q60– The steel S–N curve shown has an endurance stress amplitude of 300 MPa. With stress ratio…
GATE 2024 MT Q54– A steel bar has ultimate tensile strength 1000 MPa and fully reversed fatigue limit 250…
GATE 2023 MT Q27– Which of the following is/are responsible for reducing the high cycle fatigue life of a…
GATE 2023 MT Q64– A specimen has maximum initial surface-crack size 1.5 mm and cyclic stresses max=300 MPa,…
GATE 2022 MT Q52– An alloy has the following high-cycle fatigue data for alternating stress a: Stress (MPa)…
GATE 2020 MT Q62– A fatigue specimen has constant-amplitude cyclic stress and zero mean stress, with da/dN(…