Abstract:
The complex method for determining the characteristics of wave processes, which was approved earlier in testing fibers, is modified to the case of polymer film samples. Registration of electric signals by antennas in the rf range at the instants of passage of an elastic longitudinal unloading wave in a narrow film strip after a preset initial quasi-static tension makes it possible to determine the wave velocity. The mass velocity behind the wave front was determined from the frames of high-speed video recording of motion of the free edge of the strip after its failure. These data are used for determining the jumps in strain and stress at the wave front and the instantaneous Young modulus corresponding to this wave process.
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