Investigation of fibre reinforced shape memory polymer composites for structural components

Investigation of fibre reinforced shape memory polymer composites for structural components

Shape memory polymers (SMPs), comprising a distinctive shape memorizing capability, is a significant and evolving branch of smart polymers. Shape memory polymer composites (SMPCs) were developed by reinforcing the SMP matrix to improve the inherently weak mechanical properties and durability of SMPs. General polymer composites have become a successful substitute construction material. Similarly, with both the structural performance and shape memory effect (SME), SMPCs will be ideal candidates to remedy the challenges of futuristic construction techniques. Specifically, SMPCs can be used effectively in prefabricated modular constructions, curved beams and other civil infrastructures to overcome drawbacks associated with the high requirements of labour, time and cost. This research aimed to develop circular and square hollow sectioned (CHS and SHS) structural SMPC components for the construction industry. E-glass, carbon and natural basalt fibres were integrated as reinforcements. The thermomechanical, mechanical, shape memory and programming damage characteristics were evaluated to analyse material performance. The SMPC structural sections were fabricated with a specially designed mould and the SME, damage predictions, structural performance and proof of concept were analysed. The durability of SMPCs was also investigated; mainly in terms of behaviour under fire, smoke generation, thermal decomposition, volatile gas characterisation, fatigue, moisture and elevated temperatures. Importantly, this thesis presents a firsthand, indepth programming damage analysis framework to fill knowledge gaps in the SMPC research field by linking experimental outcomes with viscoelastic FEA studies. Overall, this study established a comprehensive and wellrounded SMPC design outline to develop SMPC structural sections for civil constructions for the first time. The outcomes of this thesis will guide engineers to revolutionize well established construction methods and technologies, and provide innovative solutions to make civil constructions smarter, faster and cheaper.

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