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Saeedifar, M. (author), Saleh, M. (author), Krairi, Anouar (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)The present study proposes a comprehensive integrity assessment approach for a full-scale adhesively-bonded bi-material joint for maritime applications. The joint represents a cross-section of the bond-line connection of a ship with a steel hull and a sandwich composite superstructure. The full-scale joint consists of a sandwich composite...journal article 2023
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Charpentier, G.V.M. (author), Lafont, Ugo (author), Teixeira De Freitas, S. (author)Spacecraft experience minimal mechanical loads in space, but with the development of reusable spacecraft for interplanetary exploration and repeated landings, structures will be subjected to increased mechanical stress. The impact of the space environment on the aging of adhesive materials used in space structures over long-term applications is...journal article 2023
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Moazzami, M. (author), Akhavan-Safar, A. (author), Ayatollahi, M. R. (author), Poulis, J.A. (author), da Silva, L. F.M. (author), Teixeira De Freitas, S. (author)Adhesive joints are frequently exposed to cyclic ageing conditions during their service life, which can have a substantial impact on the mechanical properties of both the adhesive and the substrates. The safe life philosophy, commonly employed in the design of bonded joints, underscores the importance of obtaining an accurate estimate of the...journal article 2023
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de Araujo Alves Lima, Rosemere (author), Tao, R. (author), Bernasconi, A.C. (author), Carboni, M. (author), Carrere, N. (author), Teixeira De Freitas, S. (author)Aiming to increase damage tolerance of adhesively bonded joints, this work explores the influence of CFRP layup of the adherends on the crack onset and crack propagation of composite bonded joints under mode I loading. Quasi-static Double Cantilever Beam tests were performed using four different CFRP layups bonded with two adhesives. Parallel...journal article 2023
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de Araujo Alves Lima, Rosemere (author), Tao, R. (author), Bernasconi, A. (author), Carboni, Michele (author), Carrere, Nicolas (author), Teixeira De Freitas, S. (author)Understanding the relationship between the sensors’ outputs and the damage evolution within the joints is becoming increasingly crucial to improving structural health monitoring systems and collecting data to improve the joint’s design. Therefore, a study of the acoustic emission method associated with visual fracture evaluation was proposed to...poster 2023
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Teixeira De Freitas, S. (author), Budzik, Michal K. (author)The bondline thickness is a crucial parameter affecting the strength and toughness of adhesive joints. This parameter is responsible for the stress distribution, and thus, the efficiency of the stress transfer between the adherends, the failure modes, and the correspondent failure loads. However, the available literature reports different...book chapter 2023
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Moazzami, Mostafa (author), Ayatollahi, M. R. (author), Akhavan-Safar, Alireza (author), Teixeira De Freitas, S. (author), da Silva, Lucas F.M. (author)When a composite laminate is subjected to humidity, moisture diffusion occurs depending on the number and thickness of the lamina. Water diffusion changes the mechanical response of laminates and usually causes a significant reduction of the mechanical properties of the composite specimens in ocean structures. One of the most important...journal article 2023
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Blackman, Bamber (author), Sun, Fengzhen (author), Teixeira De Freitas, S. (author), De Barros, S.R. (author), Moreira Arouche, M. (author), Ivankovic, Alojz (author)This chapter discusses the mixed-mode loading of adhesive joints. The importance of mixed-mode loading is first introduced and then test methods commonly used to measure the mixed-mode fracture resistance of adhesive joints are presented and briefly discussed. The approaches to determine the fracture resistance are briefly reviewed and then...book chapter 2023
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Tomić, Nataša Z. (author), Saeedifar, M. (author), Saleh, M. (author), Marinković, Aleksandar (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)The aim of this research was to investigate the self-healing potential of damaged Al joints when bonded using novel eco-epoxide adhesives derived from tannic acid (TA). Two eco-epoxy components based on TA, (A) glycidyl ether and (B) glycidyl phosphate ester of TA, were produced. The effect of the eco-epoxy components on the self-healing...journal article 2022
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Moazzami, M. (author), Ayatollahi, Majid R. (author), Akhavan-Safar, Alireza (author), Teixeira De Freitas, S. (author), Poulis, J.A. (author), da Silva, Lucas F.M. (author)The adhesive layer in the adhesive joints can experience different modes of loading. Although the fracture energy of adhesive is generally considered to be a material parameter, it is found to be a function of the joint configuration too. Thus, to accurately simulate the behaviour of bonded joints, it is recommended to obtain the fracture...journal article 2022
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Saleh, M. (author), Budzik, Michal K. (author), Saeedifar, M. (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)Thicker bondlines along with manufacturing-tolerant and fracture-resistant adhesives are trends visible across different industries, especially maritime. In this work, two contrasting adhesives: an elastic-brittle epoxy-based, and a nonlinear-ductile methyl methacrylate (MMA) are characterized and compared via tensile, compact tension (CT)...journal article 2022
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de Araujo Alves Lima, Rosemere (author), Oswal, Akshit (author), Roux, N. (author), Bernasconi, Andrea (author), Carboni, Michele (author), Carrere, Nicolas (author), Teixeira De Freitas, S. (author)Delamination growth in fibre reinforced polymer composites is generally evaluated with experiments that have been standardized for quasi-static load conditions. These tests characterize unidirectional delamination growth in mode I (DCB), mode II (ELS or ENF) of mixed mode conditions (MMB). However, little attention is paid in literature to the...conference paper 2022
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Tao, R. (author), Lubineau, Gilles (author), Teixeira De Freitas, S. (author)Carbon fiber-reinforced polymers (CFRPs) have widely attracted the aerospace and automotive industries due to high stiffness and lightweight. Secondary adhesive bonding of CFRPs is a promising research field to fully explore their potential. However, multiple challenges have limited the further application of adhesively-bonded composite joints...conference paper 2022
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Charpentier, G.V.M. (author), Lafont, Ugo (author), Teixeira De Freitas, S. (author)Spacecrafts are subjected to very few mechanical loads but in the future with reusable spacecraft designed for interplanetary explorations and with the repetition of landing and take off, structures will be subjected to significant mechanical loads. The degradation due to space aging conditions, of the adhesive materials used as joints in space...conference paper 2022
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Moazzami, M. (author), Ayatollahi, M. R. (author), Akhavan-Safar, A. (author), Teixeira De Freitas, S. (author), Poulis, J.A. (author), da Silva, L. F.M. (author)In some industrial applications, adhesive joints are cyclically exposed to a moist environment, where cyclic moisture absorption and desorption can significantly alter the fracture energy of the bonded joints. Most previous studies are based on monotonic aging conditions, while the performance of bonded joints under cyclic aging is not well...journal article 2022
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Abdelfattah, Ibrahim (author), Ferreira, Francisca (author), Saleh, M. (author), Reis, Paulo N.B. (author), Teixeira De Freitas, S. (author)Three-point bending analysis, experimental and numerical, is conducted for three different sizes, 30*30 mm, 40*40 mm and 60*60 mm, of one-sided square cross-ply TEXIPREG HS 160 RM carbon-fiber-reinforced polymer (CFRP) patches as well as intact and notched specimens. The tests are carried out with the aim to study the influence of the patch’s...journal article 2022
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Wang, W. (author), Teixeira De Freitas, S. (author), Poulis, J.A. (author), Zarouchas, D. (author)High performance structures require the use of different materials to meet their demanding requirements. Especially fibre reinforced polymer composites are nowadays often bonded to metals in order to take the most advantage of the materials properties and to minimize their disadvantages. However, the interface in such bi-material assemblies...review 2021
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Budzik, Michal K. (author), Wolfahrt, Markus (author), Reis, Paulo (author), Kozłowski, Marcin (author), Sena-Cruz, José (author), Papadakis, Loucas (author), Saleh, M. (author), Machalicka, Klara V. (author), Teixeira De Freitas, S. (author), Vassilopoulos, Anastasios P. (author)The development of new adhesives has allowed to expand the application of bonding into the most diverse industrial fields. This review article presents the commonly used experimental methods for the investigation of mechanical performance of adhesively bonded joints in the aerospace, wind energy, automotive and civil engineering sectors. In...review 2021
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Tsiangou, E. (author), Teixeira De Freitas, S. (author), Benedictus, R. (author), Villegas, I.F. (author)This paper addresses the sensitivity of the ultrasonic welding process for joining dissimilar composites to variations in either the welding force or amplitude of vibrations. For that, carbon fibre (CF)/epoxy specimens were welded to CF/polyetheretherketone (PEEK) specimens, through a polyetheretherimide (PEI) coupling layer co-cured with the...journal article 2021
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Moreira Arouche, M. (author), Teixeira De Freitas, S. (author), de Barros, Silvio (author)In this work, the influence of a layer of glass fiber mat (GFM) inserted in a bi-material bonded joint interface is investigated as a toughening mechanism to improve the fracture performance of bonded structures. Composite-to-metal bonded specimens were manufactured by hand lay-up using two different consolidation processes: at room pressure...journal article 2021