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Q8. Define the term fatigue as applied to engineering components. Explain how fatigue failure is influenced by the presence of slag in welds; Define the term residual stress and explain how this can influence the fatigue life of a component; During a crankcase inspection, a crack has been discovered in the lower section of a bed plate transverse girder. Explain the action you, as Chief Engineer, would take to ensure safe operation the engine if facilities to repair the damage were not immediately available.