Acoustic emission of a crazing polymer
作者:
I. Grabec,
A. Peterlin,
期刊:
Journal of Polymer Science: Polymer Physics Edition
(WILEY Available online 1976)
卷期:
Volume 14,
issue 4
页码: 651-661
ISSN:0098-1273
年代: 1976
DOI:10.1002/pol.1976.180140407
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractThe acoustic emission from a crazing polyvinyltoluene in a tensile and bending experiment is described. Acoustic emission appears as a series of bursts which most likely correspond to the initiation and growth of crazes. The emission intensity is characterised by acoustic activity (pulse rate) measured by the ring‐down technique. The average activity increases with strain. During repeated loading the acoustic activity shows a measurable intensity and significant rise only beyond the maximum strain of the former runs. This is equivalent to Kaiser's effect in metals. Acoustic emission during the creep experiment occurs in three characteristic periods. They are characterized as the relaxation, fatigue, and breakdown periods. Visual observations indicate that the relaxation period corresponds to the initiation, and the fatigue period to the growth of crazes. In the breakdown period a macroscopic crack develops and the sample fail
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