Fracture of a borosilicate glass under triaxial tension

Abstract : The growth of 3D star-like cracks in a porous borosilicate glass was induced by "cold-to-hot" thermal shocks inducing triaxial tension in cylindrical specimens. As a consequence of the dynamic character of their propagation, the cracks had a "mirror- mist- hackle" aspect. Damage in unbroken specimens was characterized either by a modification of their vibration modes or by direct observations of sections. Pores were identified as the crack initiation sites. Thermo-mechanical simulations were done to analyze the stress field and its consequences, using either linear thermo-elasticity or an anisotropic continuum damage mechanics approach. Crack initiation was predicted at mid-height, at the center of the specimens, in accordance with the observations. The pore-induced stress concentration was shown to depend on the local stress triaxiality, as well as the stress intensity factor for an annular crack initiated from a pore. The capacity of the anisotropic continuum damage approach to predict qualitatively the influence of the shape of the specimen, as well as damage-induced modifications of vibration modes and the total fracture surface was demonstrated.
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Submitted on : Wednesday, November 21, 2012 - 1:32:50 PM
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Véronique Doquet, Neji Ben Ali, Andrei Constantinescu, Xavier Boutillon. Fracture of a borosilicate glass under triaxial tension. Mechanics of Materials, Elsevier, 2012, 57, pp.15-29. ⟨10.1016/j.mechmat.2012.10.008⟩. ⟨hal-00755477⟩



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