final notecard notes

final notecard notes - size would occur Corrosion fatigue...

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Mechanical failure can occur because of fracture or excessive deformation. Ductile overload fracture: tensile stress reaches ultimate tensile strength of material; not most common. Brittle fracture: stress much lower than yielding or ultimate stresses needed to cause fracture. Stress raisers often cause failure. To prevent, calculate stress intensity factor. When that reaches critical stress intensity factor, crack grows and fracture occurs. Critical size crack is largest size crack before failure. Fatigue fractures: result from progressive growth of crack due to alternating/cycling stresses. Safe Life Analysis given to estimate when critical nucleus crack
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Unformatted text preview: size would occur. Corrosion fatigue: presence of corrosive materials. Hydrogen embrittlement: cause internal crack by hydrogen diffusing into crystal lattice of metal surface. Stress corrosion cracking: requires sustained tensile stress. Excessive elastic deflection: result of excessive deflection of beam or twist. Gross yielding (plastic deformation): parts become permanently deformed and fail. Buckling: geometric instability; results from excessive compressive loads. Creep: Elevated temperatures cause slow, steady deformation at constant load, compressive or tensile. Time and temperature are the crucial factors....
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