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systèmes complexes

Mechanics & Industry (1)

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Estimation de durées de vie de systèmes mécaniques complexes par essais accélérés
Pascal Lantiéri, Fabrice Guérin, Ridha Hambli
Journal:

Mechanics & Industry / Volume 9 / Issue 6 / November 2008

Published online by Cambridge University Press:

16 May 2009, pp. 497-505

Print publication:

November 2008
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Nous proposons dans cet article une méthode d'essai accéléré applicable pour des systèmes mécaniques complexes dont la durée de vie ne peut être exprimée par une relation analytique du niveau de sollicitation. Dans de tels cas, une approche numérique peut rester envisageable. Il s'agit alors d'ajuster le modèle numérique à partir de tests sévérisés au cours desquels les défaillances apparaissent plus rapidement qu'en conditions nominales. Il est ainsi possible de prévoir à partir d'essais très courts des défaillances susceptibles d'apparaître après une longue période d'utilisation. Cette méthode est mise en œuvre dans le cas de sollicitations en fatigue, l'endommagement cumulé conduisant à la rupture ne pouvant être modélisé que par un code numérique en éléments-finis.