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Start Over Author "Júlio Cesar dos Santos" Journal composites part c: open access
2 results on '"Júlio Cesar dos Santos"'

1. Tensile and flexural properties of epoxy laminates with natural papaya bast fibre cellular layers

Author

Gabriela Luiza Cota Coura, Fabrizio Scarpa, Júlio Cesar dos Santos, Lívia Ávila de Oliveira, Rodrigo Teixeira Santos Freire, and Túlio Hallak Panzera

Subjects
Structural material, Fabrication, Materials science, Mechanical Engineering, laminated composite, Mechanical properties, Bending, Epoxy, mechanical properties, Papaya bast fibre, honeycomb-like structure, Flexural strength, Laminated composite, Mechanics of Materials, visual_art, Ultimate tensile strength, Ceramics and Composites, visual_art.visual_art_medium, Bast fibre, TA401-492, Composite material, Honeycomb-like structure, Layer (electronics), Materials of engineering and construction. Mechanics of materials
Abstract

This work focuses on the fabrication and characterisation of epoxy composites reinforced with natural fibre layers extracted from the inner bast (phloem) of the papaya plant (Carica papaya) under tensile and three-point bending loading. The papaya phloem is composed of fibrous laminas that wrap and reinforce the stem of the plant. A set of quasi-periodically arranged holes disrupt the continuity of these layers, through which the branches emerge. The fibres in each layer constitute an anisotropic honeycomb-like structure, whose elongated cells align along a single preferential direction. Papaya-reinforced epoxy composites are fabricated by hand lay-up and evaluated using two full-factorial designs based on the fibre-to-load direction in longitudinal (0°) and transverse (90°) conditions, for configurations without holes and alternating holes. Composites made with randomly-oriented short fibres are also evaluated along with the first experiment. The tensile and flexural properties obtained are compared to other materials in the literature to assess its potential as a structural material. The results show that the papaya bast fibre layers can be a promising reinforcement for polymeric composites.

Published
2020
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2. Life cycle assessment of fibre metal laminates: An ecodesign approach

Author

Guilherme Germano Braga, Gabriela Giusti, Júlio César dos Santos, Diogo Aparecido Lopes Silva, André Luis Christoforo, Túlio Hallak Panzera, and Fabrizio Scarpa

Subjects
Sandwich panels, Castor-oil polymer, Natural fibres, Eco-efficiency, Circular economy, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Despite the extensive research on renewable resources (RR) and their potential applications in composite materials and sandwich structures, there remains a significant dearth of life cycle assessment (LCA) studies that comprehensively evaluate the efficacy of RR in mitigating environmental impacts (EI). To bridge this gap, the present study aims to investigate twelve different designs of sandwich panels, specifically referred to as Fibre Metal Laminates (FML). These FML combine aluminium skins (2024-T3 and 1200-H14), polymer matrices (Epoxy, Polyester, and Castor oil Bio-PU), natural fibres (Sisal, Coir, and Cynodon spp.), surface treatments for aluminium skins (sanding, NaOH, and Washprimer), and treatments for natural fibres (Ground, NaOH-treatment and untreated). A cradle-to-gate LCA is conducted, and the inventories are modelled using the OpenLCA 1.6.3 and ecoinvent 3.9 cut-off regionalized database. EI are evaluated in twelve categories, including climate change, fossil and nuclear energy use, freshwater (acidification, ecotoxicity and eutrophication), human toxicity (cancer and non-cancer), mineral resources use, ozone layer depletion, particulate matter formation, photochemical oxidant formation, and terrestrial acidification. Impact World+ method for Latin America version 1.251 is employed to calculate EI. Nine Eco-efficiency indicators and trade-off analyses are evaluated to gain insights into design decision outcomes. Among the various panels considered, FML12, manufactured with aluminium alloy 1200-H14 treated only with sanding, castor oil biopolymer and untreated coir fibres, present the most consistent eco-efficiency indicators. The reference scenario considers the average characteristics of FML (both environmental and mechanical) for trade-off analysis. Despite the fifty percent chance of better performance, FML12 is the only panel that shows higher mechanical performance and lower EI compared to the reference scenario. The importance of this article lies in the novel results obtained using the proposed eco-efficiency indicators, which can be expanded in further studies on the topic.

Published
2024
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