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Fatigue crack growth by crack tip cyclie plastic deformation: the unzipping model

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Abstract

A fatigue crack may propagate by the mechanism of crack tip cyclic plastic deformation, by the mechanism of fracture of brittle particles and embrittled grain boundaries,or, often, by a combination of both. Neutnann and Vehoff have made in situ observations of alternate shear decohhesions on two intersecting conjugate slip bands at a crack tip as the basic mechanism of fatigue crack growth. It is a mechanism by plastic deformation.

A micro-mechanism based finite element model is made to simulate the unzipping process of the crack tip shear decohesion mechanism. The calculated crack growth rates by the finite element model agree very well with the measured rates in the intermediate ΔK region of a number of materials

Résumé

La propagation d'une fissure de fatigue peut être due au mécanisme de déformation plastique cyclique de l'extrémité de la fissure, au mécanisme de rupture de portions fragiles et de frontières de grains fragilisées ou, souvent, à une combinaison de ces deux mécanismes.

Neumann et Vehoff ont procédé à des observations in situ des décohésions par cisaillement alterné dans deux bandes de glissement s'intersectant à l'extrémité d'une fissure, et ont décrit ce mécanisme par déformation plastique comme un mécanisme de base de la propagation d'une fissure de fatigue.

En vue de simuler le processus d'ouverture qui régit le mécanisme de décohésion par cisaillement à l'extrémité dame fissure, on élabore un modèle par éléments finis basé sur un mécanisme à échelle microscopique. On trouve que les vitesses de propagation d'une fissure calculées grâce à ce modèle par éléments finis sont en très bon accord lvee les vitesses mesurées dans la zone des ΔK intermédiaries et pour plusieurs matériaux.

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  1. Department of Mechanical and Aerospace Engineering, Syracuse University, 13244, Syracuse, NY, USA

    H. W. Liu

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  1. H. W. Liu
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Liu, H.W. Fatigue crack growth by crack tip cyclie plastic deformation: the unzipping model. Int J Fract 39, 63–77 (1989). https://doi.org/10.1007/BF00047440

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  • DOI: https://doi.org/10.1007/BF00047440

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