ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 27 April 2010
Page Count: 16

Fatigue from an Induced Defect: Experiments and Application of Different Multiaxial Fatigue Approaches

Leopold, Gaëlle
LMPM, UMR CNRS 6617,

Nadot, Yves
LMPM, UMR CNRS 6617,

(Received 20 August 2009; accepted 22 March 2010)

Abstract

An experimental database containing multiaxial fatigue results for C35 steel with induced defects has been previously published [Billaudeau, T., Nadot, Y., and Bezine, G., “Multiaxial Fatigue Limit for Defective Materials: Mechanisms and Experiments,” Acta Mater., Vol. 52, 2004, pp. 3911–3920; Nadot, Y., and Billaudeau, T., “Multiaxial Fatigue Limit Criterion for Defective Materials,” Eng. Fract. Mech., Vol. 73, 2006, pp. 112–133; Gadouini, H., Nadot, Y., and Rebours, C., “Influence of Mean Stress on the Multiaxial Fatigue Behaviour of Defective Materials,” Int. J. Fatigue, Vol. 30, 2008, pp. 1623–1633]. Artificial defects, in a range of 100–900 μm, are introduced at the surface of fatigue samples. The database contains experimental fatigue results for different defect size and geometry, and multiaxial loading cases with different load ratios. In the present study, five models predicting the fatigue limit of materials with defects are compared. Each model is carefully presented, predictions are compared, and input data are discussed. It is shown that it is necessary to take account for the stress distribution around the defect in order to have a good prediction for a multiaxial case.

Keywords:
high cycle fatigue, defect, multiaxial fatigue, small notch, mean stress effect

Paper ID: JAI102643
DOI: 10.1520/JAI102643
ASTM International is a member of CrossRef.