De Fazio, Dario (2020) Manufacturing and design of low weight structures and hybrid composites using hemp fibres. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: Manufacturing and design of low weight structures and hybrid composites using hemp fibres
De Fazio,
Date: 13 March 2020
Number of Pages: 162
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Chimica, dei Materiali e della Produzione Industriale
Dottorato: Ingegneria dei prodotti e dei processi industriali
Ciclo di dottorato: 32
Coordinatore del Corso di dottorato:
Durante, MassimoUNSPECIFIED
Boccarusso, LucaUNSPECIFIED
Date: 13 March 2020
Number of Pages: 162
Keywords: composite materials; hemp/carbon hybrid laminates; hemp core sandwich structures; hybrid composites tribological behaviour; quati-static characterisation; dynamic characterisation
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/16 - Tecnologie e sistemi di lavorazione
Date Deposited: 23 Mar 2020 00:07
Last Modified: 05 Nov 2021 11:39

Collection description

On the basis of the environmental sensitivity and the waste materials problems, the new industrial products must reduce the environmental impact. If the attention is focused on composite materials, the environmental issue is relevant due to the large use of synthetic and petroleum fibres. In this context, is possible to consider the use of natural fibres as reinforcement of composite materials but, even if they show good specific properties, natural fibre laminates are not able to offer mechanical performances comparable with traditional composite materials. In order to overcome the employing limit of natural fibres composites related to their mechanical performances, there is need to investigate the possible use of hemp fibre in hybrid composite laminates and in sandwich structures as core solution in primary structural applications. Therefore, on the basis of these issues, this PhD thesis has been focused on the manufacturing technologies of lightweight bio-based composite materials, and on the quasi-static and dynamic characterisation of hybrid carbon/hemp-based composite structures. Moreover, in all application in which these hybrid composite structures are subjected to tribological loads, additional wear tests are required on bio-based composite structures. The thesis work is then organised in five chapters. In the first, after a brief overview on the historical use of bio-based composite materials, the state of art of bio-based hybrid composite structures and the wear behaviour of natural fibre laminates is analysed. Therefore, on the basis of this overview, is expressed the need to investigate on the possible use of hemp fibres in hybrid composite laminates and sandwich structures. Moreover, in case of hybrid bio-based composite with hemp fibres on the external ply subjected to tribological loads, a wear characterisation of these materials is required. In the second chapter are reported a detailed overview on natural fibre concerning their classifications, their advantage compared to traditional fibres and their disadvantages, thermoplastic and thermoset matrix usually used and then the traditional production technologies. The third chapter is focused on the materials and methods employed in the research topics, in detail: the production of a new geometry of lightweight hemp core for sandwich structures; a quasi-static and dynamic behaviour of bio-based hybrid laminates and sandwich structures; a study on the wear behaviour of hemp fibres. After a detailed overview on reinforcements and matrix employed in the experimental campaign, a detailed description of the research topics and of the production techniques are presented. Moreover, in order to make the structure of the thesis better arranged, the experimental campaign sections were divided in five parts each one of these is dedicated to a specific research topic. As well as the third chapter, in order to make more fluent the reading, the fourth chapter is divided in four parts (from part 2 to part 5) in which is described the experimental set-up and are discussed the relative results. The fifth chapter close the thesis work in which the main results of each research topic are discussed.


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