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Influence of water on stress corrosion cracking of epoxy bonds
Author(s) -
Mostovoy Sheldon,
Ripling E. J.
Publication year - 1969
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.1969.070130602
Subject(s) - adhesive , relative humidity , materials science , composite material , epoxy , cracking , corrosion , humidity , stress (linguistics) , fracture (geology) , stress corrosion cracking , linguistics , philosophy , physics , layer (electronics) , thermodynamics
Environment assisted fracturing, or stress corrosion cracking of adhesive joints in liquid water or a humid atmosphere was shown to occur at values of applied crack extension force ς a considerably below those required for onset of opening‐mode rapid fracture ς c . The minimum value of ς a below which no cracking was observed, ς SSC , was dependent on the relative humidity and the particular adhesive used. For two adhesive systems, the one with the lower hardener content and post cure temperature showed both a lower absolute value of ς SSC and a lower ratio of ς SSC to ς c . The value of ς SSC for both adhesive systems decreased as the humidity was increased. As the relative humidity approached 100%, the value of ς SSC approached its value for liquid water. Values of ς c for the two adhesives differed by a ratio of approximately 2:1. When water was introduced to the crack tip, ς c for the less tough material increased while it was not significantly changed for the tougher material.