Lock-in thermography and fatigue limit of metals
2000; Linguagem: Inglês
10.21611/qirt.2000.051
AutoresJean-Claude Krapez, Didier Pacou, G. Gardette,
Tópico(s)Mechanical and Thermal Properties Analysis
ResumoThermography was performed on stainless steel 316L and aluminium alloy 7010 samples as they were submitted to a sinusoïdal mechanical stress (traction/compression).For each stress amplitude value the temperature data were recorded in 5 s.A specific signal demodulation procedure was used to extract the first two Fourier components and the mean temperature rise.From their particular dependence on the stress amplitude, characteristic stress values could be derived.In some instances, these values are very close to the fatigue limit of the considered material. Tested materialsWe considered stainless steel 316L (AISI) and the aluminium alloy 7010.The dog-bone specimens were 3 mm thick.The central part, 20 mm long, had a constant width of 25 mm.The specimens were grinded in order to delay crack initiation.
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