A grain boundary interaction model for microstructurally short fatigue cracks

Panwar, S.; Adams, J. F.; Allison, J. E.; Jones, J. W.; Sundararaghavan, V.

doi:10.1016/j.ijfatigue.2018.04.029

Title: A grain boundary interaction model for microstructurally short fatigue cracks

Journal Article · 28 April 2018 · International Journal of Fatigue

DOI: https://doi.org/10.1016/j.ijfatigue.2018.04.029 · OSTI ID:1538330

Panwar, S. ^[1]; Adams, J. F. ^[2]; Allison, J. E. ^[2]; Jones, J. W. ^[2]; Sundararaghavan, V. ^[2]

University of Michigan, Ann Arbor, MI (United States). PRedictive Integrated Structural Materials Science (PRISMS) Center; University of Michigan, Ann Arbor, MI (United States); DOE/OSTI
University of Michigan, Ann Arbor, MI (United States). PRedictive Integrated Structural Materials Science (PRISMS) Center; University of Michigan, Ann Arbor, MI (United States)

Here in this paper, we present a phenomenological model for simulating the effect of a grain boundary on crack growth along crystallographic planes. This model combines various geometrical features of the interaction between the crack plane and the grain boundary plane. The tilt and twist misorientations, calculated at a grain boundary, between a crack plane and a favorable plane in the next grain are incorporated into this model, as are the Schmid factor of the next grain and a critical crack transmission stress. A model calibration procedure is demonstrated based on experimental short fatigue crack growth data measured in a high performance wrought magnesium alloy. The proposed combined GB interaction model is shown to accurately predict the short fatigue crack growth retardation and arrest at grain boundaries in this alloy.

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Research Organization:: University of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0008637

OSTI ID:: 1538330

Journal Information:: International Journal of Fatigue, Journal Name: International Journal of Fatigue Journal Issue: C Vol. 113; ISSN 0142-1123

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
fatigue
grain boundaries
magnesium alloys
microstructurally short cracks

Title: A grain boundary interaction model for microstructurally short fatigue cracks

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