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An experimental investigation of normal and shear stress interaction of an epoxy resin and model predictions
Author(s) -
Hu Yafei,
Ellyin Ferknand,
Xia Zihui
Publication year - 2001
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.10900
Subject(s) - materials science , viscoelasticity , creep , hydrostatic stress , composite material , epoxy , constitutive equation , hydrostatic equilibrium , shear (geology) , shear stress , stress (linguistics) , hydrostatic pressure , ultimate tensile strength , mechanics , structural engineering , finite element method , linguistics , philosophy , physics , quantum mechanics , engineering
The axial‐torsional interaction of an epoxy resin was investigated by subjecting thin‐walled tubular specimens to combined normal and shear stress components. It is shown that a superimposed normal stress (tensile or compressive) or hydrostatic pressure will influence shear creep behavior. Similarly, a superposed shear stress affects the normal stress response of the resin. The axial‐torsional stress interaction is also observed in transient stress responses under different strain paths, and in the creep deformation with non‐proportional stress histories. Urear viscoelastic constitutive models are unable to predict the aforementioned behaviors. Two typical nonlinear viscoelastic constitutive models are examined with respect to their capabilities to predict the observed response. It Is shown that the predictions of these two models agree only qualitatively but not quantitatively with the experimental results.