Abstract
For a growing crack the conventional definitions of tilting and twisting are inadequate. New definitions are proposed, based on differential geometry, and it is shown that, in homogeneous, isotropic, brittle solids, non-planar crack growth must occur entirely by tilting movements. Examples are given of the growth of cracks on curved surfaces which illustrate that the no-twist condition produces significant constraints on the path of fracture. The development of fracture surfaces when cracks are subject to mixed-mode loading conditions are described with particular reference to the influence of mode III, twisting conditions. It is shown that the requirement that only tilting can occur leads to many characteristic fractographic features.
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Hull, D. Tilting cracks: the evolution of fracture surface topology in brittle solids. Int J Fract 62, 119–138 (1993). https://doi.org/10.1007/BF00035157
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DOI: https://doi.org/10.1007/BF00035157