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Kinetics and mechanisms of fatigue damage in rubber‐toughened poly(methyl methacrylate) (RTPMMA)
Author(s) -
Bucknall Clive B.,
Marchetti Augusto
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070280902
Subject(s) - materials science , composite material , softening , hysteresis , stress (linguistics) , shear stress , shear modulus , modulus , amplitude , natural rubber , physics , quantum mechanics , linguistics , philosophy
Specimens of RTPMMA were subjected to fully reversed tension–compression cycling under load control, at a frequency of 0.5 Hz and an ambient temperature of 21°C. Modulus, hysteresis, and temperature of the polymer were monitored continuously. Significant changes were observed at stress amplitudes greater than half the short‐term yield stress. Temperature rises of between 5°C and 20°C account for the initial increases in compliance and hysteresis, which subsequently continue to increase, at approximately constant temperature. It is concluded that shear yielding is responsible for this second stage of the softening process. The rate of shear yielding increases exponentially with stress amplitude.