Abstract
One of the major problems encountered in the prediction of the hereditary viscoelastic behavior of polymeric composites, is the determination of the heredity kernels. This issue comes down to the identification of the model characterizing the viscoelastic properties of these materials. The purpose of this work is to propose a model for prediction of viscoelastic nonlinear behavior of a composite laminate matrix polyester KACT-B by the study and analysis of the heredity kernels and their influence on the life time of this material. The identification of this model required the experimental determination at room temperature, of the viscoelastic parameters of the heredity kernels by a macroscopic approach. These data provide predictive tools for the establishment of the life time under static complex solicitation and yield strength in the long term for this type of material. Sufficiently interesting in terms of concept and methodology, experimental tests in this study, performed on polymeric fiberglass composite, are still few but develop at a pace that we can look in the near future access suitable for purposes of design data.
Highlights
According to the nature of resins in their manufacture, the polymeric composites frequently present linear or nonlinear viscoelastic properties
For some fiberglass polymeric composites, the behavior becomes nonlinear before reaching strains corresponding to normal use constraints (Schapery, 2000; Zhang and Xiang, 1992; Brinson and Tuttle, 1986).The principle of superposition of Boltzmann being no more applicable in this case, models taking into account of this phenomenon should be used (Pobedria, 2007)
The question of the determination of the influence functions of nonlinear viscoelastic models of polymeric fiberglass composites is only partially addressed in the technical literature and few models are proposed
Summary
According to the nature of resins in their manufacture, the polymeric composites frequently present linear or nonlinear viscoelastic properties. One of the current problems in the study of the composites is the prediction of their holding in the long term, necessary for the design of structures based on these materials This theme based approaches are based on models of damage and hereditary creep in which assessment of the long-term behavior models must establish as integral operators (Schapery, 1997; Dimitrienko and Yu, 1989). In these conditions, one of the critical issues is the determination of the type of influence functions or kernels of operators and their parameters. The objective of this study is to study and analyze the possible influence functions through the experimental determination of their parameters in order to assess their impact on the life time of fiberglass composites
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