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A study of nonlinear viscoelasticity of an unsaturated polyester resin. Part 2. 3D model by L. Zhang; L.J. Ernst; H.R. Brouwer is a Engineering article available to read on EtoBox.

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In the first part of this paper, a uniaxial nonlinear viscoelastic model has been established to describe the long-term creep behaviour of an unsaturated polyester resin. The model was based on Schapery's thermodynamics-based theory, and included effects of physical ageing. In the present (second) part, this model is extended into a general three-dimensional form. In the 3D-model a creep contraction ratio and an instantaneous elastic Poisson's ratio are introduced. By assuming both ratios constant, albeit different from each other for all load levels, a model is obtained which is able to describe the experimentally obtained creep-recovery curves very well. A numerical scheme for the developed constitutive equations is then established and the 3D theory is implemented into a finite element method (FEM) package. In addition tests have been carried out in order to verify the theory. Tensile creep tests performed on plate-shaped specimen with a central circular hole were used to check the model calculations. In such a test plate a two-dimensional stress state exists close to the hole. Also creep and relaxation processes occur simultaneously during the test. A further validation of the

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Author

L. Zhang; L.J. Ernst; H.R. Brouwer

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-6636)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)