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Class 2 (2nd Engineer) MEP 📅 Nov 2023

Exam Question

(a) Explain metal fatigue and how fatigue failure occurs. (4)

(b) Differentiate between high stress/low cycle and low stress/high cycle fatigue giving example of each. (4)

(c) How do defects in the metal influence the expected life of a component. (4)

(d) How does fuel injection timing and cylinder power balance influence the possibility of fatigue cracks developing in the bedplate. (4)

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Reference Answer

(a) Fatigue is the process leading to localized structural damage in materials subjected to cyclic loading.
Fatigue failure can occur even when stress levels are below the ultimate tensile strength of the material.
It primarily results from repetitive cyclic loads, causing microscopic crack formation and growth over time until the component fails.
Contributing factors include:

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