Waves full crack
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There are two groups, with and without a confining pressure. A dynamic caustics system with PMMA material is used to better observe the whole process of interaction because PMMA is a transparent rock-like material. And the mechanism of irregular caustic spot on the crack path is also illustrated. The influence of the biaxial confining pressure on the stress field at the dynamic crack tip is studied, and the changes of each stress component with the change of the confining pressure are analyzed. A comparison of the experimental and theoretical results yields reasonable agreement. This approach permits the utilization of the experimental conditions obtained an instant prior to R- wave induced crack extension as input conditions for the theoretical model and allows for the prediction of the crack path and final crack length. This full-field description of the R- wave stresses is used in conjunction with a quasi-static Linear Elastic Fracture Mechanics (LEFM) approach to mixed-mode cracking. The theoretical model relies on a two-dimensional plane stress description of the propagation of a surface wave in a homogeneous, isotropic, linear elastic material. This permits the observation of the isochromatic patterns associated with the R- wave(s) and the detailed examination of R- wave induced crack extension. The events occurring subsequent to setting-off the explosive(s) are photographed using a multiple spark camera equipped to function as a dynamic light field polariscope. The experimental model consists of a thin rectangular plate of Homalite 100, a transparent bi-refringent material, on whose edge a micro-crack is located close to where one or two PETN explosive holders are mounted. Micro-crack extension induced by both a single and two approaching surface or Rayleigh waves ( R- waves) is examined experimentally and theoretically.
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