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Analysis of non‐linear stress relaxation in polymeric glasses
Author(s) -
Matsuoka S.,
Bair H. E.,
Bearder S. S.,
Kern H. E.,
Ryan J. T.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760181407
Subject(s) - materials science , glass transition , relaxation (psychology) , polycarbonate , polystyrene , stress relaxation , natural rubber , composite material , stress (linguistics) , strain rate , yield (engineering) , strain (injury) , polymer , deformation (meteorology) , thermodynamics , creep , medicine , psychology , social psychology , linguistics , philosophy , physics
Non‐linear stress relaxation data were obtained for polycarbonate and polystyrene as a function of temperature, strain magnitude and thermal history. Data were analyzed according to the previously proposed free volume model to account for the shift of relaxation times with strain and thermal history. The result of the analysis is shown to be in close agreement with the tensile stress‐strain data. The yield phenomenon is analyzed as a rate dependent strain‐induced glass to rubber transition.