Fatigue (material)
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In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, typi
Fracture surface of an aluminium crank arm from a bicycle. The dark area (due to oil, dirt and fretting) is a slow growth fatigue crack and may contain striations. The bright area is caused by sudden fracture.
Micrographs showing how surface fatigue cracks grow as material is further cycled. From Ewing & Humfrey, 1903
Fracture surface in a glass rod showing beach marks surrounding the initiation site.
Example of a HFMI treated steel highway bridge to avoid fatigue along the weld transition
Los Angeles Airways Flight 417 was a Sikorsky S-61 helicopter that crashed on August 14, 1968 in the city of Compton, California. All eighteen passengers and three crew members were killed. The aircra
Fatigue (material)
…capsize of the UK's first offshore oil platform, the Sea Gem, was due to fatigue in part of the suspension system linking the hull to the legs. The 1968 Los Angeles Airways Flight 417 lost one of its main rotor blades due to fatigue failure. The 1968 MacRobertson Miller Airlines Flight 1750 lost a wing due to improper maintenance…
N300Y departing the Disneyland Heliport five years prior to the accident flight