Paper number 1027
|USE OF A LINEAR VISCOELASTIC CONSTITUTIVE LAW TO MODEL THE TIME DEPENDENT BEHAVIOUR OF ORTHOTROPIC GLASSFIBRE REINFORCED PLASTIC|
Roland. M. Hinterhoelzl1, Guenther Schullerer1, Kurt Moser1
1Institut für Baustatik und verstärkte Kunststoffe, University of Innsbruck
Technikerstr.13, 6020 Innsbruck, Austria
|Summary||Polymeric matrix composites show a strong time-dependent behaviour. This has also been observed in long-term tests conducted at our department. One of the most powerful tools to model this time dependent behaviour is the theory of viscoelasticity. Orthotropic isothermic linear behaviour is assumed for the material under study. A three-dimensional constitutive law formulated by superposition integrals is implemented in the FEM-program ABAQUS. The ability of the implemented numerical algorithm to predict the response of a long thick-walled cylindrically anisotropic cylinder that is subjected to internal pressure is shown (a problem for which the analytical solution is known). The main future goal is to combine the study of time dependent behaviour with the analysis of the lifetime durability by means of damage mechanics. The analyst will be provided with a versatile tool with which it is possible to model the time-dependent behaviour of a wide range of materials.
||Keywords|| viscoelasticity, constitutive model, Finite Element Method, anisotropy, creep, damage mechanics, life-time analysis.
Theme : Composite Structures ; Modelling
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