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Kinetics and characterization of the process‐zone evolution in polycarbonate
Author(s) -
Kim A.,
Garrett L. V.,
Bosnyak C. P.,
Chudnovsky A.
Publication year - 1993
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.1993.070490514
Subject(s) - kinetics , polycarbonate , materials science , displacement (psychology) , decoupling (probability) , stress relaxation , composite material , optical microscope , scanning electron microscope , creep , physics , psychology , quantum mechanics , control engineering , engineering , psychotherapist
Abstract The process‐zone evolution strongly influences the crack growth of polycarbonate. A methodology for determination of the kinetics of the process‐zone evolution by decoupling these two processes was developed. This was achieved using constant displacement (stress‐re‐laxation) conditions under which the crack length remained constant. The morphology of the process zone was characterized using optical microscopy of cross sections and fracture surfaces produced with liquid nitrogen. The kinetics of process‐zone evolution and stress relaxation were monitored and analyzed. The kinetics vary significantly with the level of displacement imposed. Thus, the challenge remains to construct a master curve for the kinetics. © 1993 John Wiley & Sons, Inc.