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|Title:||HOMOGENIZATION TOWARDS WAVE PROPAGATION IN COMPOSITE MATERIALS||Authors:||TAN SWEE HONG||Keywords:||Multi-scale modelling, Generalized continuum, Homogenization, Gradient elasticity, Metaconcrete, Dynamic sub-structuring||Issue Date:||21-Aug-2018||Citation:||TAN SWEE HONG (2018-08-21). HOMOGENIZATION TOWARDS WAVE PROPAGATION IN COMPOSITE MATERIALS. ScholarBank@NUS Repository.||Abstract:||This study details the development of three homogenized models that are capable of describing the dispersive effects due to high-frequency loadings, on elastic bilaminate composites and viscoelastic locally resonant metamaterials. In order to capture high-frequency dynamics accurately within a macro structure, full-scale direct numerical simulations typically require very fine spatial mesh together with a small time-step, which inevitably lead to high computational costs. The aim of this work is to adequately capture the dispersive effect of wave propagation in composites with a lower computational cost. To this end, a bottom-up strategy is adopted to translate the rapidly fluctuating microstructural responses onto the macro scale consistently, to recover a homogenized gradient elasticity / micromorphic continuum. In contrast to many (top-down) higher order models in literature, the homogenized models determined in this work do not require any parameter calibration. For the two composites considered, extensive benchmark examples were carried out for the verification and validation of the homogenized models. The performance of the homogenized models in the regime without any clear separation of length scales, e.g. the limit of applicability during high-frequency loadings, is also discussed.||URI:||http://scholarbank.nus.edu.sg/handle/10635/150329|
|Appears in Collections:||Ph.D Theses (Open)|
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