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  • 1
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    In:  Phys. Earth Plan. Int., Minsk, Elsevier Scientific Publishing Company, vol. 6, no. 6, pp. 300-305, pp. 1091
    Publication Date: 1972
    Keywords: Source mechanics ; SModelling ; Source ; Laboratory measurements ; Seismology ; PEPI
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  • 2
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    Noordhoff International Publishing
    In:  International Journ. of Fracture, Leyden, Noordhoff International Publishing, vol. 12, no. 3, pp. 1477-1490, pp. B04306, (ISSN: 1340-4202)
    Publication Date: 1976
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  • 3
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    Institut f. Meteorol. und Geophys., Univ. Frankfurt am Main
    In:  Dissertation, San Antonio, Institut f. Meteorol. und Geophys., Univ. Frankfurt am Main, vol. 11, no. CUED/C/Mats/Tr 51, pp. 426-439
    Publication Date: 1974
    Keywords: Source mechanics ; SModelling ; Source ; Laboratory measurements ; Seismology
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  • 4
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On suppose, dans un modèle idéalisé, une rupture fragile soumise à traction et se propageant de manière bilatérale avec une vitesse constante jusqu'à atteindre sa longueur finale. Les conditions initiales et les conditions aux limites sont celles d'un état plan de déformations et d'une tension normale à la surface de la fissure, laquelle est libre de tension. Le problème est attaqué en résolvant léquation d'onde élastique par une technique de différences finies. Le déplacement en fonction du temps d'un point donné peut être interprété comme l'aboutissement de divers types d'ondes, qui prennent naissance à la fois du point d'amorçage et du point d'arrêt de la rupture. On discute l'influence de la vitesse de la rupture, et le modèle subit une modification pour tenir compte d'une vitesse variable et d'un champ de précontrainte non homogène. Les résultats des calculs sont comparés à ceux d'expériences effectuées sur de l'Araldite B. On trouve que la technique des différences finies peut décrire la propagation d'une fissure de manière satisfaisante. On discute la relation entre la vitesse de la rupture et le facteur d'intensité des contraintes dynamiques K I. La valeur critique de K I correspondant à la propagation d'une fissure est K Ic≃20 à 30 N/mm3/2. La vitesse de la rupture paraît être limitée par une arborescence qui se produit à environ 550 m/sec et qui correspond à une valeur K I de l'ordre de 150 à 250 N/mm3/2.
    Notes: Abstract In an idealized fracture model a bilateral brittle tensile crack is assumed to propagate with constant fracture velocity up to its final length. The initial and boundary conditions are plane strain and uniaxial stress perpendicular to the crack surface, which is stress-free. The problem is tackled by solving the elastic wave equation with a finite difference technique. The time function of the displacement at a given point can be interpreted in terms of the arrival of various types of waves, originating from both the initiation and the termination of the fracture. The influence of the fracture velocity is discussed. The model is then modified to allow for a variable fracture velocity and a non-homogeneous prestress field. The results of these calculations are compared with experiments, which were performed with Araldite B. It was found that the finite difference technique can satisfactorily describe the propagation of a crack. The relationship between the fracture velocity and the dynamic stress intensity factor K I is discussed. The critical K I value for crack propagation is K Ic≈20 to 30 N/mm3/2. The fracture velocity seems to be limited by branching at about 550 m/s, which occurs at K I values K I branch≈150 to 250 N/mm3/2.
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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