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FATIGUE – FAILURES VARIOUS MECHANICAL COMPONENTS

FATIGUE – FAILURES VARIOUS MECHANICAL COMPONENTS. Cracks in bicycle frame. Helical gear. Spring. Steering arm. Pedal. Stub axle. Bolt. Shaft - torsion. Source: The Open University - http://materials.open.ac.uk/mem/mem_mf.htm. AEROSPACE INDUSTRY. December 19, 2005,

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FATIGUE – FAILURES VARIOUS MECHANICAL COMPONENTS

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  1. FATIGUE – FAILURESVARIOUS MECHANICAL COMPONENTS Cracks in bicycle frame Helical gear Spring Steering arm Pedal Stub axle Bolt Shaft - torsion Source: The Open University - http://materials.open.ac.uk/mem/mem_mf.htm

  2. AEROSPACE INDUSTRY December 19, 2005, off Miami Beach, Florida, Grumman G73T Turbo Mallard seaplane Fatigue cracks in the right wing. Lading gear fatigue failure Aloha Airlines Flight 243 - April 28, 1988 Cracks in the fuselage

  3. SHIPS USS Tanker ship fractured in January 1943 • Liberty ship - USS Carlos Carillo • 2,751 built between 1941-1945 • Built from welded sections • 1500 instances of significant brittle fractures • 19 ships broke in half without warning • Steel embrittlement • Cracks initiated from stress concentrators • Crack propagation along weld lines • (source: www.wikipedia.com)

  4. STRESS ANALYSIS – FINITE ELEMENT METHOD Airplane wing spar

  5. NOTCHED SPECIMENS DUCTILE FRACTURE STUDIES Finite element analyses Scanning electron microscopy

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