Mechanical analysis and life prediction of unidirectional composites

Abstract : Fiber Reinforced Plastic materials (FRP) are beginning to find more and more applications in the civil engineering domain. Besides the use of FRPs for the reinforcement of existing structures, these materials are utilized quite often today for the construction of bridges and even for new buildings made entirely of FRPs. At the matter of fact, the light weight of composite materials is a considerable advantage compared to conventional materials such as steel or concrete. Another advantage is that they have outstanding fatigue and durability potential and that they are in general very tolerant to environmental effects such as UV radiations, moisture, chemical attack and extreme temperature variations. However, the lack of a comprehensive, validated, and easily accessible database for the durability of fiber-reinforced polymer composites as related to civil infrastructure applications is a critical barrier to their usage as main load bearing systems. The creep behavior of these materials and their failure under sustained loads remains an open research topic. This study gives a detailed analysis on the mechanical behavior of unidirectional fiber reinforced composites (UD FRP) subjected to different loading patterns (tension, compression, shear, and flexure). We develop two micromechanical models that allow us to analyze the instantaneous and the long term response of UD composites subjected to different load patterns. The first model is based on the shear-lag theory and the Beyerlein et al.[1998] developments while the second one is established using the finite element software Abaqus. A Comparative study between the two models allowed to validate the fundamental assumptions of the shear-lag theory (first model) as well as several numerical issues related to time integration and spatial discretization. The Monte Carlo method is used in order to account for the stochastic fiber strength and its impact on the ultimate tensile strength (short term) and creep (long term). A parametric investigation on the fiber type and load level/type on the short/long term behavior of UD composites is also presented
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Elias Dib. Mechanical analysis and life prediction of unidirectional composites. Materials. Université Paris-Est, 2016. English. ⟨NNT : 2016PESC1107⟩. ⟨tel-01562964⟩

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