Open Access

ARTICLE

Fatigue Assessment of Notched Steel Including Residual Stresses Obtained by the Rolling Process

G. Nicoletto¹, A. Saletti²

1 Dept. of Industrial Engineering, University of Parma, Parma, Italy
2 TP Engineering srl, Parma, Italy

Structural Durability & Health Monitoring 2012, 8(2), 131-148. https://doi.org/10.3970/sdhm.2012.008.131

Abstract

Fatigue strengthening of fillets by deep rolling is finding increased application for example in engine crankshaft production for functional and economical reasons. A fatigue design method aimed at exploiting the residual stresses that develop at a notched part following the rolling process is proposed. It is based on the superposition of residual stresses obtained by elastic-plastic FE simulation of the rolling process and the cyclic elastic stresses within a Haigh diagram framework. The fatigue design method is assessed using the experimental evidence obtained by testing notched specimens made of 30NiCrMo12 steel subjected to different rolling process parameters.

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