Searched for: author%3A%22Teixeira+de+Freitas%2C+S.%22
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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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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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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, R. (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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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)
The goal of this paper is to evaluate the strain-based partitioning method (SBM), an analytical method based on beam analysis, for the mixed-mode fracture characterization of asymmetric cracks. The fracture energy is calculated at the crack tip of mixed-mode bending (MMB) test with asymmetric geometry and asymmetric material parameters. 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
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Tsiangou, E. (author), Kupski, J.A. (author), Teixeira De Freitas, S. (author), Benedictus, R. (author), Villegas, I.F. (author)
This study aims at assessing the sensitivity of the ultrasonic welding process for joining epoxy- to thermoplastic-based composites sensitivity to the heating time. For that, carbon fibre (CF)/epoxy adherends with a co-cured PEI coupling layer were ultrasonically welded to CF/polyetheretherketone (PEEK) adherends at different heating times....
journal article 2021
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Lopes Fernandes, R. (author), Budzik, Michal K. (author), Benedictus, R. (author), Teixeira De Freitas, S. (author)
This study investigates the fracture onset and crack deflection in multi-material adhesive joints with thick bond-lines (≈10 mm) under global mode I loading. The role of adherend-adhesive modulus-mismatch and pre-crack length are scrutinized. The parameters controlling the crack path directional stability are also discussed. Single-material ...
journal article 2021
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Saeedifar, M. (author), Saleh, M. (author), Nijhuis, Peter (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)
This study is devoted to the use of acoustic emission technique for a comprehensive damage assessment, that is, damage detection, localization, and classification, of an aeronautical metal-to-composite bonded panel. The structure comprised a titanium panel adhesively bonded to carbon fiber–reinforced plastic omega stringers. The panel contained...
journal article 2021
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Saleh, M. (author), Tomić, Nataša Z. (author), Marinković, Aleksandar (author), Teixeira De Freitas, S. (author)
Two synthesized eco-epoxy components based on TA: (A) glycidyl ether and (B) glycidyl phosphate ester, are used, as a replacement for the Bisphenol A (BPA) based epoxy component, for bonding aluminum (Al) and carbon fiber reinforced polymer (CFRP). Their effect on the mode I fracture toughness (GI) is evaluated by Double Cantilever Beam (DCB)...
journal article 2021
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Arouche, M.M. (author), Saleh, M. (author), Teixeira De Freitas, S. (author), De Barros, S.R. (author)
This work investigates the effect of long-term environmental exposure on the performance of composite-to-metal bonded joints. Specimens are manufactured using a carbon-fiber reinforced polymer (CFRP) co-bonded to a steel member with epoxy adhesive and aged in a salt spray chamber. The mixed-mode fracture behavior of the non-aged and aged...
journal article 2021
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Kupski, J.A. (author), Teixeira De Freitas, S. (author)
Adhesive bonding is one of the most suitable joining technologies in terms of weight and mechanical performance for current carbon fiber reinforced polymer aircraft fuselage structures. However, traditional joint topologies such as single overlap joints induce high peel stresses, resulting in sudden failure and low joint strength when...
journal article 2021
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