The fatigue strength estimation of components containing defects, inclusions or inhomogeneities can be easily made by company engineers by means of the Murakami-Endo approach. In this paper the authors discussed the application of this method to the defect tolerant design of automotive components. The components under examination were engine conrods either made of cast iron or made by hot forging in carbon steel. In particular the topics the authors dealt with were: -the sensitivity of Murakami-Endo's formulas to the variability of material microstructure; -the treatment of surface residual stresses for fatigue strength prediction in a batch; -the ways to research and analyse defects on components in order to give a confident estimate of the maximum defect occurring in a batch of pieces. The results obtained allowed them to suggest a methodology for a confident estimate of the fatigue strength lower bound in a batch of industrial components. This approach constitutes the basis, in an industrial codesign process, for a trade-off between the costs of quality control procedures and the design optimisation of a component.
Defect tolerant design of automotive components
Schadenstoleranter Entwurf von Automobilteilen
International Journal of Fatigue ; 19 , 4 ; 319-333
1997
15 Seiten, 17 Bilder, 6 Tabellen, 40 Quellen
Aufsatz (Zeitschrift)
Englisch
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