A nonlinear viscoelastic constitutive model, in differential form, is presented based on the deformation characteristics of thermoset polymers under complex loadings. This rheological model includes a criterion to delineate loading and unloading in multiaxial stress states, and different moduli for loading and unloading behaviors. The material constants and functions of this model are calibrated in accordance with a well-defined procedure. The model predictions are compared with the experimental data of an epoxy polymer subjected to uniaxial and biaxial stress states with monotonic and cyclic loading. The agreement is very good for various loading regimes. The constitutive model is further implemented in a finite element code and the residual stresses arising from the curing process of polymer reinforced composites is determined for two different epoxy resins.
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e-mail: zihui.xia@ualberta.ca
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October 2006
Research Papers
Nonlinear Viscoelastic Constitutive Model for Thermoset Polymers
Fernand Ellyin,
Fernand Ellyin
Department of Mechanical Engineering,
University of Alberta
, Edmonton, AB, T6G 2G8, Canada
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Zihui Xia
Zihui Xia
Department of Mechanical Engineering,
e-mail: zihui.xia@ualberta.ca
University of Alberta
, Edmonton, AB, T6G 2G8, Canada
Search for other works by this author on:
Fernand Ellyin
Department of Mechanical Engineering,
University of Alberta
, Edmonton, AB, T6G 2G8, Canada
Zihui Xia
Department of Mechanical Engineering,
University of Alberta
, Edmonton, AB, T6G 2G8, Canadae-mail: zihui.xia@ualberta.ca
J. Eng. Mater. Technol. Oct 2006, 128(4): 579-585 (7 pages)
Published Online: May 9, 2006
Article history
Received:
August 31, 2005
Revised:
May 9, 2006
Citation
Ellyin, F., and Xia, Z. (May 9, 2006). "Nonlinear Viscoelastic Constitutive Model for Thermoset Polymers." ASME. J. Eng. Mater. Technol. October 2006; 128(4): 579–585. https://doi.org/10.1115/1.2345450
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