منابع مشابه
Instability in dynamic fracture.
The fracture of brittle amorphous materials is an especially challenging problem, because the way a large object shatters is intimately tied to details of cohesion at microscopic scales. This subject has been plagued by conceptual puzzles, and to make matters worse, experiments seemed to contradict the most "rmly established theories. In this review, we will show that the theory and experiments...
متن کاملOscillatory instability in two-dimensional dynamic fracture.
The stability of a rapid dynamic crack in a two-dimensional infinite strip is studied in the framework of linear elastic fracture mechanics supplemented with a modified principle of local symmetry. It is predicted that a single crack becomes unstable by a finite wavelength oscillatory mode at a velocity vc, 0.8cR<vc<0.85cR, where cR is the Rayleigh wave speed. The relevance of this theoretical ...
متن کاملMicrobranching instability and the dynamic fracture of brittle materials.
We describe experiments on the dynamic fracture of the brittle plastic, PMMA. The results suggest a view of the fracture process that is based on the existence and subsequent evolution of an instability, which causes a single crack to become unstable to frustrated microscopic branching events. We demonstrate that a number of long-standing questions in the dynamic fracture of amorphous, brittle ...
متن کاملMICRO-BRANCHING AS AN INSTABILITY IN DYNAMIC FRACTURE To appear in the proceedings of the IUTAM conference (Cambridge, 1995) MICRO-BRANCHING AS AN INSTABILITY IN DYNAMIC FRACTURE
Experiments in brittle, amorphous PMMA indicate that the process of dynamic fracture is governed by a micro-branching instability. At a critical velocity, vc, a single crack undergoes an abrupt, well-defined transition to microscopic crack branching. As a result, the velocity of the crack develops oscillations, the mean acceleration decreases and structure is formed on the fracture surface. Bey...
متن کاملExtrinsic cohesive modelling of dynamic fracture and microbranching instability in brittle materials
Dynamic crack microbranching processes in brittle materials are investigated by means of a computational fracture mechanics approach using the finite element method with special interface elements and a topological data structure representation. Experiments indicate presence of a limiting crack speed for dynamic crack in brittle materials as well as increasing fracture resistance with crack spe...
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ژورنال
عنوان ژورنال: Physics Reports
سال: 1999
ISSN: 0370-1573
DOI: 10.1016/s0370-1573(98)00085-4