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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), 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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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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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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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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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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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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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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Kupski, J.A. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author), Benedictus, R. (author)The goal of this study is to explore new topologies for adhesively bonded composite overlap joints in order to improve their strength under tensile loading. Multiple stacked overlaps, also referred as finger joints, are compared with single overlap topologies. The quasi-static tensile behaviour of single lap joints with two overlap lengths 12...journal article 2020
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Lopes Fernandes, R. (author), Teixeira De Freitas, S. (author), Budzik, Michal K. (author), Poulis, J.A. (author), Benedictus, R. (author)The aim of this study is to investigate the effect of the adherend material on the mode I fracture behaviour of bi-material composite bonded joints. Both single-material (steel-steel and composite-composite) and bi-material (steel-composite) joints bonded with a structural epoxy adhesive are studied. Additionally, two adhesive bondline...journal article 2020
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Li, X. (author), Kupski, J.A. (author), Teixeira De Freitas, S. (author), Benedictus, R. (author), Zarouchas, D. (author)This study investigates the early fatigue damage of cross-ply carbon/epoxy laminates. The aim is to unfold the damage accumulation process, understand the interaction between different damage mechanisms, and quantify their contribution to stiffness degradation. Tension-tension fatigue tests were performed, while edge observation and DIC...journal article 2020
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Quan, D. (author), Alderliesten, R.C. (author), Dransfeld, C.A. (author), Tsakoniatis, Ioannis (author), Teixeira De Freitas, S. (author), Scarselli, Gennaro (author), Murphy, Neal (author), Ivanković, Alojz (author), Benedictus, R. (author)A high-power UV-irradiation technique was proposed for the surface treatment of PPS and PEEK composites, aiming to achieve good adhesion with epoxy adhesives. The composite substrates were rapidly UV-irradiated for a duration of between 2–30s, and then bonded using an aerospace film adhesive to produce joints. Tensile lap-shear strength and...journal article 2020
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Tsiangou, E. (author), Teixeira De Freitas, S. (author), Villegas, I.F. (author), Benedictus, R. (author)Ultrasonic welding is a highly promising technique for joining thermoplastic to thermoset composites. A neat thermoplastic coupling layer is co-cured on the surface to be welded to make the thermoset composite ‘weldable’. A reliable bond is attained when miscible thermoplastic and thermoset materials are chosen. For welding carbon fibre...journal article 2020
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Tomić, Nataša Z. (author), Saleh, M. (author), Teixeira De Freitas, S. (author), Živković, Andreja (author), Vuksanović, Marija (author), Poulis, J.A. (author), Marinković, Aleksandar (author)This paper presents a new process for obtaining eco-epoxide adhesives synthesized from bio-renewable raw material (tannic acid-TA) and used for bonding lightweight materials (aluminum (Al) and carbon fiber reinforced polymer (CFRP). Two synthesized bio-epoxy components based on TA, (A) glycidyl ether and (B) glycidyl phosphate ester of TA,...journal article 2020
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Saeedifar, M. (author), Saleh, M. (author), El-Dessouky, Hassan M. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)This study is devoted to the damage characterization of Non-Crimp Fabric (NCF), 2D plain-woven (2D-PW) and 3D orthogonal plain-woven (ORT-PW) carbon/epoxy laminates, subjected to compression after multiple-impact loading, using Acoustic Emission (AE). The ultrasonic C-scan images showed that the interlaminar damage area induced by the single and...journal article 2020
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Saleh, M. (author), Saeedifar, M. (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)Mechanics of double-lap Steel-to-CFRP adhesively-bonded joints loaded in tension are investigated experimentally using Digital Image Correlation (DIC) and Acoustic Emission (AE), analytically using a one-dimensional closed-form solution and numerically with Finite Element analysis. The double-lap bi-material joints are fabricated of a steel core...journal article 2020
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Marques, Ana C. (author), Mocanu, Alexandra (author), Tomić, Nataša Z. (author), Balos, Sebastian (author), Stammen, Elisabeth (author), Lundevall, Asa (author), Abrahami, Shoshan T. (author), Günther, Roman (author), de Kok, John M.M. (author), Teixeira De Freitas, S. (author)Using adhesives for connection technology has many benefits. It is cost-efficient, fast, and allows homogeneous stress distribution between the bonded surfaces. This paper gives an overview on the current state of knowledge regarding the technologically important area of adhesive materials, as well as on emergent related technologies. It is...review 2020
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Kupski, J.A. (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)The aim of this study is to evaluate the enhanced off-axis properties of thin plies to improve the performance of adhesively bonded carbon fiber reinforced polymers. Single lap bonded joints with three different ply thicknesses of 200 μm, 100 μm and 50 μm were tested under quasi-static tensile loading. Acoustic Emission and Digital Image...journal article 2020
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Tsiangou, E. (author), Teixeira De Freitas, S. (author), Villegas, I.F. (author), Benedictus, R. (author)With its short heating times, ultrasonic welding is a highly promising technique for joining thermoplastic (TPC) to thermoset (TSC) composites, to prevent thermal degradation of the thermoset adherend. A neat thermoplastic coupling layer is co-cured on the surface to be welded to make the TSC “weldable”. For welding CF/PEEK to a TSC adherend,...conference paper 2020