Abstract
The possibility of slip bands providing sites for fracture initiation within composites of lamellar construction is investigated. It is proposed that the tips of these bands, which terminate at the composite's bimetallic interfaces, are the specific locations of fracture initiation. Application of a dislocation intensity factor criterion allowed the applied stress at which cracks may be initiated to be calculated. The predictions compare favorably with experimental data. The dependence of the fracture initiation stress calculated from this model is shown to follow a Hall-Petch relationship.
Résumé
On étudie la possibilité de formation de bandes de glissement constituant un site d'amorçage d'une rupture dans l'association composite d'alliages à structure laminaire. On propose que les extrémités de ces bandes qui se situent aux interfaces du composite bi-métallique sont les sites spécifiques d'amorçage de la rupture. En appliquant un critère comportant un facteur d'intensité des dislocations, on arrive à calculer la contrainte appliquée pour laquelle des fissures peuvent être amorcées. Les prédictions se comparent assez bien aux données expérimentales. On démontre que la contrainte d'amorçage de la rupture calculée par ce modèle est en dépendance d'une relation de Hall-Petch.
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This was supported by the National Science Foundation under Grant No. DMR-8116363.
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Omoike, G.O., Vilmann, C.R. Fracture initiation in a lamellar alloy. Int J Fract 30, 261–273 (1986). https://doi.org/10.1007/BF00019706
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DOI: https://doi.org/10.1007/BF00019706