Abstract

The photoviscoelastoplastic method as an experimental stress and strain analysis in the viscoelastoplastic material which exhibits strain-rate dependent mechanical and optical behaviors is very complicated, because the viscoelastoplastic fringe patterns should be continuously measured over the period of the loading process. In this paper, a hybrid experimental-numerical method for analyzing the stresses and strains in a three-dimensional viscoelastoplastic material is proposed. In this hybrid method, experimental fringe patterns measured by the scattered-light method are compared with those numerically simulated by the finite element method thus obtaining the reliability of the numerical results. The effectiveness of the proposed method is demonstrated by an example, m which the distributions of strain rates, strains and stresses on the axi-symmetrical section of a circumferentially notched cylindrical specimen of mixed polyester resin under torsion are analyzed using this hybrid method.

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