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hmwk1b - ME541 Fatigue of Materials Winter Quarter 2006...

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ME541: Fatigue of Materials Winter Quarter 2006 Homework 1 Solutions 1) (Note: All answers are subjective (i.e., no right or wrong)) a) Child’s bicycle used in rough child's play could have cracked at the joint from high stress or strain due to fracture from either i) brittle fracture quasi static loading or ii) low cycle cyclic fatigue cracking b) Aluminum bat develops cracks due to high stress or strain low cycle fatigue. c) Corrosion/environmental cracking exacerbated by low cycle high strain fatigue. Brittle fracture occurred from pre-existing cracks. d) Corrosion /environmental cracking initiating in a notch due to low cycle high strain fatigue. Brittle fracture from the pre-existing cracks. e) Time-dependent deformation from creep ( temperatures greater than 0.5 of the homologous) 2) (Note: All answers are subjective (i.e., no right or wrong)) Sail boat rudder experiences non constant amplitude cyclic loading during course corrections and tacking. Static loads are mainly due to gravity and/or buoyancy effects. Working loads are imposed during course corrections and tacking. Vibratory loads occur when running at high speeds (before the wind) or while motoring. Accidental loads can arise from hardovers or running aground. 3) (Note: All answers are subjective (i.e., no right or wrong)) Difficult to assess this failure based on the verbal description. However, the bracket no doubt has geometric transitions with attendant stress raisers. Because more than one
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