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Anand, C. (author), Groves, R.M. (author), Benedictus, R. (author)There has been an increase in the use of ultrasonic arrays for the detection of defects in composite structures used in the aerospace industry. The response of a defect embedded in such a medium is influenced by the inherent anisotropy of the bounding medium and the layering of the bounding medium and hence poses challenges for the...journal article 2021
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van Kuijk, J.J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)The substantiation of fatigue crack closure corrections is disputed, based on the closure stress definition. The ΔK<sub>eff</sub> equation lacks a physical explanation. An inconsistency is observed between the opening stress S<sub>op<sub>phen</sub></sub> as used by this equation and the physical opening stress S<sub>op<sub>phys</sub></sub>....journal article 2021
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Wang, X. (author), Benedictus, R. (author), Groves, R.M. (author)A conventional distributed fiber optic sensing system offers close to linear sensitivity along the fiber length. However gold nanoparticles (NP) have been shown to be able to enhance the contrast ratio to improve the quality of signal detection. The challenge in improving the contrast of reflected signals is to optimise the nanoparticle...journal article 2021
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van Kuijk, J.J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)To improve resolution of in-situ measurement of crack closure and opening in fatigue, potential drop (PD) measurement technique has been further developed to measure thousands of times through each load cycle with high precision. The results are interpreted with physical phenomena like strain, Poisson's effect, piezo-resistivity, plasticity,...journal article 2021
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Ewald, Vincentius (author), Sridaran Venkat, Ramanan (author), Asokkumar, Aadhik (author), Benedictus, R. (author), Boller, Christian (author), Groves, R.M. (author)Predictive maintenance, as one of the core components of Industry 4.0, takes a proactive approach to maintain machines and systems in good order to keep downtime to a minimum and the airline maintenance industry is not an exception to this. To achieve this goal, practices in Structural Health Monitoring (SHM) complement the existing Non...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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Koutras, N. (author), Benedictus, R. (author), Villegas, I.F. (author)The effect of temperature on the lap shear strength (LSS) and failure mechanisms of ultrasonically welded carbon fibre reinforced polyphenylene sulphide (CF/PPS) joints was investigated, correlating the weld performance to the crystallinity degree of PPS at the weldline. The single-lap shear tests were carried out at temperatures ranging from...journal article 2021
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Reurings, C. (author), Koussios, S. (author), Bergsma, O.K. (author), Vergote, K. (author), Paeshuyse, L. (author), Benedictus, R. (author)A realistic wear test was developed for porous thermal insulation systems exposed to high temperature turbulent gas flow, because it is essential for the development of existing and new concepts of such insulation and therefore also for the performance of processes that depend on such insulation. Wear is crucial and often dominant for the...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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Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Benedictus, R. (author), Villegas, I.F. (author)Continuous ultrasonic welding is a promising high-speed and energy-efficient joining method for thermoplastic composite structures. Our aim was to identify and understand differences between the static and continuous ultrasonic welding process for thermoplastic composites. In particular, melting of the interface, consumed power and energy...journal article 2020
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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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Quan, D. (author), Alderliesten, R.C. (author), Dransfeld, C.A. (author), Murphy, Neal (author), Ivanković, Alojz (author), Benedictus, R. (author)Interlaying thermoplastic veils into carbon fibre/epoxy composites has proved to significantly increase the interlaminar fracture toughness. The main toughening mechanism is thermoplastic fibre bridging for the non-meltable veils and matrix toughening for the meltable veils. Herein, to take advantage of different toughening mechanisms, hybrid...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), Benedictus, R. (author)Efficient joining of hybrid thermoset/thermoplastic composite joints is critical to produce high performance lightweight structures while keeping the cost low. Herein, a high-power UV-irradiation technique was proposed to rapidly active the surfaces of PEEK and PPS composites for the following co-cure joining with epoxy composites. A single...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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Anand, C. (author), Groves, R.M. (author), Benedictus, R. (author)Ultrasonic testing using arrays is becoming widely used to test composite structures in the Aerospace industry. In recent years, the Full Matrix Capture (FMC) technique has been implemented to extract the signals for post-processing to form an image. The inherent anisotropy and the layering of the structure pose challenges for the...journal article 2020
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Reurings, C. (author), Koussios, S. (author), Bergsma, O.K. (author), Breugem, W.P. (author), Vergote, K. (author), Paeshuyse, L. (author), Benedictus, R. (author)The purpose of this work is to experimentally establish the combined influence on the flow and thermal resistance of an exhaust pipe wall formed by a porous, compliant layer with overlying discrete roughness elements exposed to the pulsating exhaust gas flow of a combustion engine. Through measuring the streamwise pressure drop over and...journal article 2020