4.7 Article

Predicting fatigue crack initiation from coupled microstructure and corrosion morphology effects

Journal

ENGINEERING FRACTURE MECHANICS
Volume 220, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2019.106661

Keywords

Fatigue crack initiation; Corrosion morphology; Crystal plasticity modeling; X-ray computer tomography; Microstructure

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Funding

  1. Office of Naval Research [N00014-14-1-0544, N00014-14-1-0012]

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The onset of fatigue crack initiation is driven by the microstructure and the corrosion morphology; however, these mechanisms are rarely studied synergistically. In this work, characterizations of the microstructural features and the corrosion morphology resulting from two different environmental exposures are instantiated into crystal plasticity models. Fatigue indicator parameters (FIPs) are calculated from the micromechanical fields to quantify failure. The FIPs compare favorably to predict the experimentally observed location of fatigue crack initiation. These results show the potential behind analyzing environmentally-assisted fatigue crack initiation from a multivariable perspective.

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