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Teaching durability in automotive applications using a reliability approach

Article dans une revue avec comité de lecture
Author
MOREL, Anne
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
BIGNONNET, André
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
ccGERMAIN, Guénaël
ccMOREL, Franck
206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]

URI
http://hdl.handle.net/10985/6898
DOI
10.1007/s12008-010-0110-8
Date
2010
Journal
International Journal on Interactive Design and Manufacturing

Abstract

Fatigue phenomena, which appear generally below the yield stress, is the cause of more than 80 % of in-service mechanical failures. However, the optimization of the weight and cost when designing mechanical components or structures, linked to improved performance, leads to increasingly stressed components. Therefore a fatigue design approach must be done by the engineer. This paper shows the experience gained over five academic years of teaching fatigue the assessment of automotive components using a reliability approach to predict probability of failure, in the engineering school, Arts et Métiers ParisTech, in France. The choice was made to present a comprehensive fatigue assessment approach using a method, initially developed in the automotive industry and since extended to the aeronautical and mechanical industries. This method is known as the “Stress-Strength interference analysis”. The “Stress” represents the distribution of the driver severity, and the “Strength” represents the distribution of the fatigue strength of all the components. A suspension arm is used to illustrate the approach. The Dang Van multiaxial fatigue criterion is implemented in a Finite Elements Code and a danger coefficient is visualized on the meshed structure. The fatigue analysis is interpreted with respect to the target reliability sought by the car- manufacturer.

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