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High temperature fatigue crack growth in two metals under constant and variable amplitude loading
KTH, Superseded Departments, Solid Mechanics.
2002 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 24, no 11, 1159-1168 p.Article in journal (Refereed) Published
Abstract [en]

Results are presented for fatigue crack growth at elevated temperatures during both constant amplitude and variable amplitude loading. A careful experimental investigation is presented to show that the concept of the effective stress-intensity factor range DeltaK(I)(eff) can be used to eliminate the load ratio effect on fatigue data and produce one single set of crack growth data. The fatigue crack propagation data corrected for crack closure is then used for comparison of mean crack propagation rates for variable amplitude loads with simple time histories. It is concluded that measured crack closure can not fully explain the discrepancies between measured and predicted propagation rates. A reduction factor fitted to the experimental data could be used to successfully correlate the results.

Place, publisher, year, edition, pages
2002. Vol. 24, no 11, 1159-1168 p.
Keyword [en]
crack closure, fatigue crack growth, variable amplitude loading
URN: urn:nbn:se:kth:diva-21929ISI: 000178298500005OAI: diva2:340627
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Nilsson, Fred L.
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