Abstract
Thin walled cylindrical specimens of poly(methylmethacrylate) containing artificial flaws of different length and machined along a generator of the cylinder, are subjected to internal pressure pulses (shock pulses) of increasing magnitude until fracture occurs. A shock tube is used to generate the shock pulse. The variation of the stress required to induce fracture with crack length is studied. It is found that an equation similar to the Griffith relationship applies over the range of crack lengths 38 mm>2c>16 mm, the surface energy value required to fit the Griffith type equation to the experimental data in this crack length range being similar to that derived from quasi-static testing of the same material. It is found that the range of applicability of the Griffith equation is determined by the magnitude of the fracture stress of the non-artificially flawed material at the particular strain-rate at which the test is conducted.
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