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Boundary element analysis of CT specimens with straight and curved crack fronts

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Abstract

Stress intensity factors (SIFs) are computed by the boundary element method for standard compact tension specimens. Traction singular elements are employed along the crack front which enable SIFs not only to be extrapolated from crack opening displacements but also to be directly obtained as problem unknowns. Both straight and curved crack fronts are analyzed: the latter are taken to be in the form of circular arcs with curvature radii ranging from 3.145 to 0.707 the specimen thickness. The influence of Poisson's ratio on the stress intensity factor distribution is also investigated.

Résumé

On calcule les facteurs d'intensité des contraintes pour les éprouvettes normalisées de traction compactes par un méthode d'analyse d'éléments aux limites. Le long du front de fissure, on utilise des éléments singuliers en traction, ce qui permet non seulement d'extrapoler les facteurs d'intensité des contraintes à partir des déplacements d'ouverture de la fissure, mais aussi de les obtenir directement en tant qu'inconnues du problème. On analyse aussi bien les fronts de fissure droits que courbes, ces derniers étant considérés comme des arcs de cercle dont le rayon varie entre 0.3145 et 0.707 fois l'épaisseur de l'éprouvette. On étudie également l'influence du modèle de Poisson sur la distribution du facteur d'intensité des contraintes.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Calabria, Arcavacata di Rende, Cosenza, Italy

    M. Laura Luchi & Sergio Rizzuti

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  1. M. Laura Luchi
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  2. Sergio Rizzuti
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Luchi, M.L., Rizzuti, S. Boundary element analysis of CT specimens with straight and curved crack fronts. Int J Fract 34, 23–40 (1987). https://doi.org/10.1007/BF00042122

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  • DOI: https://doi.org/10.1007/BF00042122

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