Fatigue Analysis - UTEP

Stress-Life ApproachFor Extreme EnvironmentsFatigue AnalysisStress-Life ApproachPresented by Calvin M. Stewart, PhDMECH 5390-6390 Spring 2021 Outline Fatigue Loading Stress-Life Approach Unmodified Endurance Limit Endurance Limit Modifiers Mean Stress Solving ProblemsFatigue LoadingFatigue Loading Components, structures, and vehicles are subjected to quite diverse load histories. Some load histories may be simple and repetitive. Others may be completely random. The randomness may contain substantial portions of more deterministic loading. For example, the ground-air-ground cycle of an aircraft has substantial similarity from flight to LoadingGround-Air-Ground Cycle of AirCraftRepetitiveRandomnessFatigue LoadingOffshore StructuresAircraftEnvironmental EffectsFatigue LoadingTypical Load Histories From Actual Ground Vehicle ComponentsFatigue LoadingA Typical Load History of Short-Span BridgeFatigue Loading These load histories are typical of those found in real-life engineering situations.

unnotched specimens based on 106 to 5x108 cycles to failure in laboratory air environment. •Can range from essentially 1 to 70 percent of the ultimate tensile strength. •Example of 1 percent of S u is a high strength steel with a sharp notch subjected to a high mean tensile stress in a very corrosive atmosphere. •Example of 70 percent of S

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  Ultimate, Failure, Strength

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