Reflective photoelasticity and holo-interferometry applied to stress wave propagation
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The principal stress distribution over a section of a polyester model of a semi-infinite plate during the propagation of a stress wave has been determined experimentally. The stress pulse was generated by the impact of a pendulum hammer. Two external suitable trigger mechanism were used to trigger a double-pulse Ruby laser (0.5 Joule per pulse) at pre-determined intervals. One surface of the model was made fully reflecting so that by means of reflective holo-interferometry of that surface and reflective photoelasticity through the other surface of the model the isopachic and isochrometic fringe patterns were recorded at different time delays after impact.
Key Wordsdynamic Holo-interferometry dynamic photoelasticity stress wave
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