Citation: QIAN Renyuan, WANG Tiangui, SHEN Jingshu. ACOUSTIC EMISSION DURING STRETCHING OF POLYMERS[J]. Chinese Journal of Polymer Science, ;1983, 1(2): 168-175. shu

ACOUSTIC EMISSION DURING STRETCHING OF POLYMERS

Received Date: 4 May 1983

Acoustic emission has been studied for a wide range of polymers including amorphous glasses, semi-crystalline polymers, copolymers, polymer blends and a crosslinked rubber during the course of uni-axial stretching at room temperature. For non-crystalline polymers acoustic emission occurred in rather small number of events accompanied by crazing and micro-crack formation. Strong acoustic activity appeared during yielding and necking of crystalline polymers. Rather small number or none of acoustic bursts occurred during the initial stage of neck drawing but numerous strong bursts appeared when drawing proceeded approaching specimen break.Specimens of the same polymer but of different fabrication history may be reflected in their acoustic emission behavior.Acoustic emission during stretching crosslinked polybutadiene rubber was very weak but observable when the force-elongation curve started to deviate from the linear region.No Kaiser effect was observed for the rubber.Very strong and numerous acoustic emission was observed during stretching specimens of polymer blends.High impact resistant polymer modifications showed no sharp increase of acoustic activity before specimen break.So long as the polymer and conditions of specimen fabrication are the same quite reproducible acoustic behavior could be observed.
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