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Thermoelastic investigations for fatigue life assessment

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Tomlinson RA, Marsavina L

Editorial: SAGE PUBLICATIONS LTD, Springer Boston, EXPERIMENTAL MECHANICS, 44 (5), p.487-494, 2004.


An investigation is presented on the suitability and accuracy of a thermoelastic technique for the analysis of fatigue cracks. The stress intensity factor ranges DeltaK(I) and DeltaK(II) are determined from thermoelastic data recorded from around the tip of a sharp slot in a steel specimen under biaxial load, in order to assess the accuracy of the technique. DeltaK(I) and DeltaK(II) are determined to within 4% and 9% of a theoretical prediction, respectively. The results from a similar test on a fatigue crack under biaxial load are also presented. These show that thermoelastic stress analysis is a rapid and accurate way of analyzing mixed-mode fatigue cracks. A discussion is given on the potential of thermoelastic stress analysis of propagating cracks.

Cuvinte cheie: analiza teroelestica a tensiunilor, fisuri de oboseala, incarcari bi-axiale // thermoelastic stress analysis, fatigue cracks, biaxial loads