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An influence of normal stress and pore pressure on the conditions and dynamics of shear crack propagation in brittle solids E. V. Shilko, S. G. Psakhie, V. L. Popov

By: Shilko, Evgeny VContributor(s): Psakhie, Sergey G, 1952-2018 | Popov, Valentin LMaterial type: ArticleArticleSubject(s): сдвиговые трещины | хрупкие тела | поровое давление | нормальное напряжениеGenre/Form: статьи в журналах Online resources: Click here to access online In: AIP Conference Proceedings Vol. 1783. P. 020207-1-020207-4Abstract: The paper is devoted to the study of the influence of crack-normal stress on the shear strength of the brittle material with initial crack and the geometrical condition of acceleration of dynamically growing crack towards the longitudinal wave speed. We considered elastic-brittle permeable materials with nanoscale pore size. We have shown that pore fluid in nanoporous brittle materials influences mainly the condition of shear crack propagation transition from conventional sub-Rayleigh regime to supershear one. The results of the study make it possible to assess the ability of initial cracks in brittle materials to develop in supershear regime under the condition of confined longitudinal shear.
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The paper is devoted to the study of the influence of crack-normal stress on the shear strength of the brittle material with initial crack and the geometrical condition of acceleration of dynamically growing crack towards the longitudinal wave speed. We considered elastic-brittle permeable materials with nanoscale pore size. We have shown that pore fluid in nanoporous brittle materials influences mainly the condition of shear crack propagation transition from conventional sub-Rayleigh regime to supershear one. The results of the study make it possible to assess the ability of initial cracks in brittle materials to develop in supershear regime under the condition of confined longitudinal shear.

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