Localized impact damage of polymethylmethacrylate at temperatures lower and higher than the glass transition point
Shcherbakov I. P.1, Chmel A. E.1
1Ioffe Institute, St. Petersburg, Russia
Email: chmel@mail.ioffe.ru
A shock wave in the polymethylmethacrylate was excited with a sharpened-pendulum-type testing machine. The energy yield stimulated by the material strain and microcracking in the locally damaged surface was detected by the acoustic emission (AE) method in the frequency ranges of 80-200 and 600-800 kHz. The low-frequency AE series were attributed to the polymer deformation, while the high-frequency emission was related to microcracking. The experiments were conducted in the temperature range from room temperature to 110oC which is slightly higher than the glass transition point (104oC). Relative contribution of the strain energy was prevalent at all the temperatures. At the temperatures higher than the glass transition point, some signs of strain hardening appeared. Keywords: polymethylmethacrylate, impact damage, acoustic emission.
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