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Delayed yielding of epoxy resin under tension, compression, and flexure. I. Behavior under constant strain rate
Author(s) -
Ishai Ori
Publication year - 1967
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.1967.070110616
Subject(s) - epoxy , composite material , materials science , tension (geology) , strain rate , viscoplasticity , compression (physics) , yield (engineering) , stress (linguistics) , shear (geology) , structural engineering , constitutive equation , linguistics , philosophy , finite element method , engineering
Series of loading tests were carried out on epoxy resin specimens, at varying constant strain rates, under tension, compression, and flexure. The stress–strain relationship revealed a distinct yielding stage followed shortly by a post‐yielding region of decreasing load. In all cases, results indicate linearity between yield stress and log strain rate, in accordance with Eyring's theory of viscous flow. For specimens unloaded close to the yield point, photoelastic observations revealed a residual pattern parallel to the theoretical principal shear stresses. These results, supported by additional data from other works, indicate a viscoplastic deviatoric stress‐biased diffusional mechanism as the dominant factor in the yielding of an amorphous crosslinked epoxy system.