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Microstructure based fatigue analysis of cast components under variable amplitude loading

 
: Eufinger, J.; Heinrietz, A.; Bruder, T.; Hanselka, H.

:

Materialwissenschaft und Werkstofftechnik 42 (2011), Nr.10, S.866-873
ISSN: 0933-5137
Englisch
Zeitschriftenaufsatz
Fraunhofer LBF ()

Abstract
Reliable numerical fatigue life analyses are becoming increasingly important given the need to reduce the time and costs for product development and the need to evaluate large and single components. Stress-based approaches as well as the local strain approach and its fracture mechanics based extension (PJ model) are in use for that. Both the local strain approach and the PJ model require the supply of pure material data. This requirement for input data that are not component-specific makes such approaches interesting for widespread application. The accuracy of numerical fatigue life analyses is an essential criterion for the acceptance and the spread in industrial application. In the local strain approach, accuracy is determined on one hand by the transferability of material data for the fatigue life analysis of components and on the other by the damage accumulation rule. In this paper, the local strain approach and the PJ model are used to analyse fatigue life under bo th constant and variable amplitude loading. These analyses are based on the experimental results obtained from tests of a commercial vehicle component made of nodular cast iron EN-GJS-400-15. Aspects of transferability and damage accumulation are considered. Results obtained from using an elastic-plastic fracture mechanics based approach to estimate a P SWT-N curve, taken into account the inhomogeneities in the microstructure of the cast iron, are also presented.

: http://publica.fraunhofer.de/dokumente/N-189134.html