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Modeling Nonlinear and Tme-Dependent Behaviors of Polymeric Sandwich Composites at Various Environmental Conditions

BENTOLHODA DAVOODI, ANTONIO GOMEZ, BRIAN PINTO, ANASTASIA MULIANA, VALERIA LA SAPONARA

Abstract


Polymeric sandwich composites are appealing for lightweight structures that require high strength and stiffness such as parts of aircraft, marine vessels, civil infrastructures and wind turbine blades. During service, polymeric sandwich composites undergo complex loading histories, such as combined static and cyclic loading, in addition to a constant exposure to hostile environments, i.e., temperature and humidity changes. In addition, one of the characteristics of polymers is their prominent viscoelastic response when subjected to mechanical loading and the viscoelastic response of polymers becomes more pronounced at elevated temperatures and high humidity. Coupled mechanical loading and hostile environments cause the constituents of the sandwich structures to experience different time-dependent behavior and degradation, leading to complex failure mechanisms. The aim of this study is to be able to predict the performance of sandwich composite subjected to mechanical loading histories and various environmental conditions, by incorporating knowledge of the behavior in each constituent (skin and core). We present experiments and numerical analyses in order investigate the overall mechanical response of a sandwich composite and its constituents, immersed in fluid at 50oC. The observed behavior of sandwich composite is strongly influenced by the response of the constituents at different environmental conditions.


DOI
10.12783/asc33/26111

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