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    Volume 4, Issue 2 (February 2015)

    Special Issue Paper

    Load Interaction Effects in a Medium Strength Steel for Railway Axles

    (Received 2 March 2014; accepted 14 August 2014)

    Published Online: 28 February 2015

    CODEN: MPCACD

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    Abstract

    As is well known, an interaction effect arises on crack propagation when a specimen or a component is subjected to variable amplitude fatigue loading. Depending on the applied load sequence, a certain amount of retardation or acceleration can then be observed, on the fatigue crack growth rate, with respect to the constant amplitude case. In the case of structural ductile materials, the interaction phenomenon is mainly addressed by the local plasticity at the crack tip and can be explained, from a global point of view, by adopting the crack closure concept. From this point of view, in the present research, load interaction effects in a medium strength steel for railway axles are analyzed. An experimental campaign was carried on this material, using SE(T) specimens, in order to understand and quantify the interaction effects arising from relevant load sequences derived from service. The experimental outcomes were then modeled adopting both a simple no-interaction approach and a more sophisticated strip-yield model in order to quantify the possible interaction effects. The modeling was carried out considering different experimental techniques for deriving the crack growth and threshold behaviors of the material, i.e., the traditional ΔK-decreasing technique and the compression pre-cracking one.


    Author Information:

    Beretta, Stefano
    Department of Mechanical Engineering, Politecnico di Milano, Milano,

    Carboni, Michele
    Department of Mechanical Engineering, Politecnico di Milano, Milano,

    Regazzi, Daniele
    Department of Mechanical Engineering, Politecnico di Milano, Milano,


    Stock #: MPC20140033

    ISSN:2165-3992

    DOI: 10.1520/MPC20140033

    Author
    Title Load Interaction Effects in a Medium Strength Steel for Railway Axles
    Symposium ,
    Committee E08