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Numerical and experimental characterisation of polylactic acid (PLA) processed ...
Salgueiro, Mariana P.; Pereira, Fábio A. M.; Faria, C.L.; Pereira, E. N. B.; Almeida, João Alberto Pinheiro Pereira; Campos, Teresa D.; Fakher, ChaariIn additive manufacturing (AM), one of the most popular procedures is material extrusion (MEX). The materials and manufacturing parameters used in this process have a significant impact on a printed product’s quality. The purpose of this work is to investigate the effects of infill percentage and filament orientation on the mechanical properties of printed structures. For this reason, the characterisation of po...
Identification of apple fruit-skin constitutive laws by full-field methods usin...
Campos, Teresa Daniela Azevedo; Araújo, Rafael; Xavier, José; QUYEN, NGUYEN-TRONG; Dourado, N.; Morais, José; Pereira, FábioThe protective and preservative role of apple skin in maintaining the integrity of the fruit is well-known, with its mechanical behaviour playing a pivotal role in determining fruit storage capacity. This study employs a combination of experimental and numerical methodologies, specifically utilising the digital image correlation (DIC) technique. A specially devised inverse strategy is applied to evaluate the me...
The influence of hydroxyapatite crystals on the viscoelastic behavior of poly(v...
Quinaz, Tiago Filipe Simões; Freire, Tânia F.; Olmos, Andrea Alexandra Rodrigues; Martins, Marcos; Ferreira, Fernando; Moura, Marcelo F. S. M. deComposites of poly(vinyl alcohol) (PVA) in the shape of braids, in combination with crystals of hydroxyapatite (HAp), were analyzed to perceive the influence of this bioceramic on both the quasistatic and viscoelastic behavior under tensile loading. Analyses involving energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) allowed us to conclude that the production of a homogeneous lay...
Auxetic textile reinforced composites: classification, mechanical properties an...
Hoa, Nguyen N. X.; Peixoto, Joaquim; Cabral, Isabel; Fangueiro, Raúl; Ferreira, Fernando; QUYEN, NGUYEN-TRONGAuxetic textile reinforced composites are increasingly used in various industries such as aerospace, construc tion, automotive, medicine, sport, etc. due to their distinctive advantages. This paper reports a review of the mechanical properties and applications of auxetic composites. This review puts an emphasis on auxetic fibres, yarns, and fabrics that can be used to fabricate auxetic composites.
A review on auxetic knitted fabrics: geometrical structures, auxetic performanc...
Hoa, Nguyen N. X.; Peixoto, Joaquim; Cabral, Isabel; Fangueiro, Raúl; Ferreira, Fernando; QUYEN, NGUYEN-TRONGKnitting technology is one of the most important textile processes. It has advantages of high structural va riability, high materials adaptability, high productivity and huge potential for applications in both apparel and industries. The studies have shown that both weft- and warp knitting have been adopted for producing auxetic knitted fabrics based on different auxetic geometrical structures. This paper summa...
Auxetic materials and structures for potential defense applications
Hoa, Nguyen N. X.; Peixoto, Joaquim; Cabral, Isabel; Fangueiro, Raúl; Ferreira, Fernando; QUYEN, NGUYEN-TRONGAn auxetic material exhibits exceptional features compared to conventional material. It gets broadened when it is stretched or becomes smaller when it is compressed because it has a negative Poisson’s ratio. Moreover, auxetic materials possess some enhanced properties, such as shear resistance, indentation resistance, fracture toughness, energy absorption, etc. These enhanced properties make the auxetic materia...