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Predicting embrittlement of polymer glasses using a hydrostatic stress criterion
Author(s) -
Clarijs Coen C. W. J.,
Leo Vito,
Kanters Marc J. W.,
Breemen Lambert C. A.,
Govaert Leon E.
Publication year - 2019
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.47373
Subject(s) - embrittlement , materials science , hydrostatic stress , composite material , ultimate tensile strength , polymer , cavitation , polysulfone , stress (linguistics) , yield (engineering) , hydrostatic equilibrium , mechanics , thermodynamics , finite element method , physics , linguistics , philosophy , quantum mechanics
In this study, the aging‐induced embrittlement of three polymer glasses is investigated using a previously developed hybrid experimental–numerical method. The evolution of yield stress of unnotched tensile bars upon aging is coupled to the evolution of embrittlement of notched tensile bars using a numerical model combined with a critical hydrostatic stress criterion that determines the onset of failure. The time‐to‐embrittlement of notched tensile bars with a different notch geometry is predicted and in good agreement with the experimentally determined value. Next to that, the approach is extended to three polysulfone polymers, and it is shown that the value of the critical hydrostatic stress correlates well with the polymers entanglement density: : polymers with a denser entangled network display higher values, that is, a higher resistance against incipient cavitation. © 2019 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47373.