ISSN: 1546-962X
Published Online: 4 October 2004
Page Count: 13

High Cycle Fatigue Testing and Analysis Using Car Standard Sequence
Morel, F
Associate Professor, Laboratoire de Mécanique et de Physique des Matériaux (LMPM), Ecole Nationale de Mécanique et d'Aérotechnique (ENSMA),

Ranganathan, N
Professor, Laboratoire de Mécanique et de Rhéologie (LMR), Université de Tours,

(Received 19 April 2002; accepted 17 July 2003)

Abstract

An original computer software package for controlling a servo-hydraulic machine was used to carry out uniaxial and biaxial variable amplitude loading tests on a high strength steel. Tension-compression and torsion uniaxial tests, as well as combined proportional tension-torsion tests were performed under the car loading sequence CARLOS used for fatigue strength investigations of car wheel suspension components. The number of sequences to crack nucleation was estimated by means of a crack front marking technique using very small amplitude cycles to generate marker bands on the fracture surface. The experimental data obtained from these tests were compared to the predictions of the fatigue life prediction method proposed by Morel and based on a microplasticity analysis. It was shown that all the predictions, though non-conservative, were within an acceptable scatter band.

Keywords:
high cycle fatigue, damage accumulation, multiaxial loading, fatigue crack nucleation, variable amplitude loading tests, fatigue life prediction

Paper ID: JAI19047
DOI: 10.1520/JAI19047
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