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Cumulative damage of high-strength cast iron alloys for automotive applications

: Schönborn, Steffen; Kaufmann, Heinz; Sonsino, Cetin Morris; Heim, Rüdiger

Postprint (PDF; )

Procedia Engineering 101 (2015), S.440-449
ISSN: 1877-7058
International Conference on Material and Component Performance under Variable Amplitude Loading (VAL) <3, 2015, Prague>
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer LBF ()
cast iron alloys; MADI; allowable damage sum; automotive application; EN-GJS-500-7; SiboDur 700-10

The cumulative damage calculation method generally applied in the automotive sector is the Palmgren-Miner-Hypothesis with its modification according to Haibach. In several design codes the theoretical Palmgren-Miner damage sum Dth = 1.0 is still recommended as the allowable damage sum Dal despite the fact that it renders unsafe calculated fatigue lives.
Results obtained with modern high-strength cast iron alloys such as EN-GJS-500-7, SiboDur 700-10 and MADI (Machinable Austempered Ductile Iron) under a standard Gaussian spectrum for chassis applications and also under a fuller injection pump spectrum suggest the allowable damage sum Dal = 0.3 for fatigue life estimations.