caa a22 4500 469125489 CHVBK 20180323133149.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00028916 doi (NATIONALLICENCE)springer-10.1007/BF00028916 Path and kinetics of branching from defects under uniaxial and biaxial compressive loading [Elektronische Daten] [M. Barquins, J. Petit, D. Maugis, K. Ghalayini] In order to understand the physical significance of branching features, especially path and kinetics, formed from defects in confined geological or mining conditions, a set of branch fractures obtained under uniaxial and biaxial loading at the tip of an isolated pre-existing oblique open slot was studied in PMMA (polymethylmethacrylate) plates. It was found that the branching always initiated perpendicular to the local plane tangent to the slot edge at the branch crack root while the branch crack root-crack tip distance increased with the slot-loading axis angle; the influence of biaxial loading is also discussed. The study of the stress field linked to an elliptical slot under shear conditions confirms these experimental observations and predicts the influence of the radius of curvature at the crack tip on the branching distance. The conditions of propagation are studied in terms of strain energy release rate along the stress trajectory starting from the point of maximum tensile stress at the slot edge, taking into account the presence of microcracks stemming from the slot tip induced by the sawing method. This allows one to describe the three successive régimes of propagation of the branch crack: spontaneous, catastrophic and controlled ruptures, according to the intensity of the applied compressive uniaxial stress and the size of pre-existing microcracks at the edge of the open slot. The computed variation of the branch crack length versus time agrees well with our experimental observations. Kluwer Academic Publishers, 1991 Barquins M. Laboratoire de Physique et Mécanique de la Matière Hétérogène (URA 857), CNRS-ESPCI, 10 rue Vauquelin, 75231, Paris Cedex 05, France aut Petit J. Laboratoire de Géologie Structurale (URA 1371), CNRS-USTL, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France aut Maugis D. Laboratoire des Matériaux et Structures en Génie Civil (UMR 113), CNRS-LCPC, 58 boulevard Lefebvre, 75732, Paris Cedex 15, France aut Ghalayini K. Laboratoire des Matériaux et Structures en Génie Civil (UMR 113), CNRS-LCPC, 58 boulevard Lefebvre, 75732, Paris Cedex 15, France aut International Journal of Fracture Kluwer Academic Publishers 54/2(1992-03-01), 139-163 0376-9429 54:2<139 1992 54 10704 https://doi.org/10.1007/BF00028916 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00028916 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Barquins M. Laboratoire de Physique et Mécanique de la Matière Hétérogène (URA 857), CNRS-ESPCI, 10 rue Vauquelin, 75231, Paris Cedex 05, France aut NATIONALLICENCE 700 1- Petit J. Laboratoire de Géologie Structurale (URA 1371), CNRS-USTL, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France aut NATIONALLICENCE 700 1- Maugis D. Laboratoire des Matériaux et Structures en Génie Civil (UMR 113), CNRS-LCPC, 58 boulevard Lefebvre, 75732, Paris Cedex 15, France aut NATIONALLICENCE 700 1- Ghalayini K. Laboratoire des Matériaux et Structures en Génie Civil (UMR 113), CNRS-LCPC, 58 boulevard Lefebvre, 75732, Paris Cedex 15, France aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 54/2(1992-03-01), 139-163 0376-9429 54:2<139 1992 54 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer