Chapter 8.4

Chapter 8.4 - Fatigue (Failure under fluctuating / cyclic...

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16 MSE 2090: Introduction to Materials Science Chapter 8, Failure Under fluctuating / cyclic stresses, failure can occur at loads considerably lower than tensile or yield strengths of material under a static load: Fatigue Estimated to causes 90% of all failures of metallic structures (bridges, aircraft, machine components, etc.) Fatigue failure is brittle-like (relatively little plastic deformation) - even in normally ductile materials. Thus sudden and catastrophic! Applied stresses causing fatigue may be axial (tension or compression), flextural (bending) or torsional (twisting). Fatigue failure proceeds in three distinct stages: crack initiation in the areas of stress concentration (near stress raisers), incremental crack propagation, final catastrophic failure. Fatigue ( Failure under fluctuating / cyclic stresses)
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17 MSE 2090: Introduction to Materials Science Chapter 8, Failure Fatigue: Cyclic Stresses (I) Periodic and symmetrical about zero stress Periodic and asymmetrical about zero stress Random stress fluctuations
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 8.4 - Fatigue (Failure under fluctuating / cyclic...

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