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Class 2 (2nd Engineer) MEKM 📅 Jan 2021

Exam Question

(a) Briefly explain the term metal fatigue and further explain how fatigue failure occurs.

(b) State the difference between high stress/low cycle and low stress/high cycle fatigue giving an example of each

(c) State how defects in the metal can influence the expected safe life of a component.

(d) State how fuel injection timing and cylinder power balance can influence the possibility of fatigue cracks developing in the bedplate.

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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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