Papers by R.D.S.G. Campilho
Academia Materials Science, Jul 9, 2024
Adhesive bonding plays a fundamental role in various industries, including aerospace, aeronautic... more Adhesive bonding plays a fundamental role in various industries, including aerospace, aeronautics, and automotive sectors. Unlike traditional mechanical joints, adhesive joints offer an efficient approach with fewer components, leading to weight reduction in the final structure. Additionally, these joints facilitate the joining of dissimilar materials while distributing applied loads more uniformly, resulting in better stress distributions compared to conventional joining techniques. Within this context, the integration of adhesive bonds in joggle tubular structures presents a viable alternative to join tubes with identical diameter. The bi-adhesive technique involves using a brittle adhesive in the inner overlap region, and a ductile adhesive at the overlap edges, aiming to improve load transfer. The objective of this study is to conduct a numerical analysis using cohesive zone modelling (CZM) to investigate the tensile behavior of joggle tubular adhesive joints between composite adherends and bonded by the bi-adhesive technique. Initially, the proposed CZM approach is validated against experimental data. Subsequently, the focus is on numerically assessing the tensile strength of the joints and testing different bi-adhesive joint options, aiming to improve the maximum load (Pm), displacement at Pm (dPm), and energy absorbed at failure (Ef). Validation of the cohesive models has been successfully achieved. In conclusion, it was found that, depending on the bi-adhesive conditions, improvements are possible to obtain over single adhesive joints.
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Academia Materials Science, Oct 30, 2023
We are thrilled to introduce a new addition to the world of scientific literature: Academia Mater... more We are thrilled to introduce a new addition to the world of scientific literature: Academia Materials Science, published by Academia.edu. As the Editor-in-Chief, I am honored to present this journal's characteristics, aims and scope, and our strategies to ensure its success in an ever-evolving field. Materials science is at the heart of innovation across industries, from electronics to healthcare, energy to infrastructure, and beyond. The quest for advanced and smart materials, biomaterials, structural, electronic, optical, and magnetic materials, and nanotechnology has fuelled breakthroughs that shape our world. Yet these discoveries often remain confined within academic silos, untapped by the wider scientific community. Our journal's mission is to bridge these gaps and promote collaboration, knowledge exchange, and exploration within the vibrant field of materials science. We aim to serve as a beacon of knowledge, offering a platform where scientists, researchers, students, and industry professionals can come together to document new findings, discuss emerging trends, and accelerate the pace of research.
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Journal of Research Updates in Polymer Science, 2023
The adhesive bonding technique is employed from the aeronautical/aerospace industry to current ho... more The adhesive bonding technique is employed from the aeronautical/aerospace industry to current house products. To comply with the requirements of distinct applications, different joint configurations are available to the designer. While single-lap joints (SLJ) are the most common in application and research, double-lap joints, scarf joints and T-joints find specific applications. T-joints are seldom studied in the literature, but these are used, for instance, in aircraft to bond the stiffener beams to the skin, or in the cars between the B-pillar and the rocker. Due to the high stress concentrations, T-joints often fail under average stresses much lower than the adhesive strengths, giving rise to the necessity for proper design and strength improvement methodologies. This work initially aims to validate the cohesive zone modelling (CZM) technique with experiments, and then use it to numerically evaluate and optimize the performance of T-joints subjected to peel loads. CZM is nowadays regarded as the most powerful strength prediction tool for adhesive joints, and can be a valuable tool to improve T-joints. Different features are addressed for a complete analysis: adhesive type, geometrical parameters, dual-adhesive technique for strength improvement, and composite joints. The evaluated geometrical parameters are the base adherend thickness (a), T-part thickness (t), overlap or bonding length (l) and curvature radius (r). As a result of this work, the model was successfully validated, and clear design guidelines were provided to define the ideal geometric and material (adhesive) conditions for best performance.
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CRC Press eBooks, Apr 12, 2023
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Techniques and Innovation in Engineering Research and Technology Vol. 5, Jan 5, 2023
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Techniques and Innovation in Engineering Research and Technology Vol. 5, Jan 5, 2023
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Lecture notes in mechanical engineering, 2023
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Lecture notes in mechanical engineering, 2023
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Lecture notes in mechanical engineering, 2023
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Techniques and Innovation in Engineering Research Vol. 7, Jan 7, 2023
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Procedia Manufacturing, 2020
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Journal of the Brazilian Society of Mechanical Sciences and Engineering
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Techniques and Innovation in Engineering Research Vol. 3
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Techniques and Innovation in Engineering Research Vol. 1
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Research Aspects in Chemical and Materials Sciences Vol. 1
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Technological Innovation in Engineering Research Vol. 3
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Technological Innovation in Engineering Research Vol. 3
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Meccanica, 2022
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Engineering with Computers, 2022
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Neste trabalho descrevem-se estudos experimentais e numericos relativos a resistenciaresidual de ... more Neste trabalho descrevem-se estudos experimentais e numericos relativos a resistenciaresidual de reparacoes adesivas por sobreposicao simples e dupla de laminados de carbonoepoxido.E utilizado um modelo de dano coesivo em modo misto baseado no uso indirecto daMecânica da Fractura para simular numericamente a iniciacao e propagacao do dano nasreparacoes. O metodo numerico e inicialmente validado com resultados experimentais emreparacoes bidimensionais por sobreposicao simples. Os parâmetros analisados sao o modo derotura, a tensao de colapso e a rigidez equivalente das reparacoes em funcao do comprimentode sobreposicao e da espessura do remendo. Obteve-se boa concordância entre os resultadosnumericos e os experimentais, no que diz respeito aos parâmetros estudados. O modelonumerico e posteriormente aplicado na identificacao das alteracoes geometricas quemaximizam a resistencia residual de reparacoes tridimensionais por sobreposicao simples edupla sujeitas a solicitacoes de traccao, c...
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Papers by R.D.S.G. Campilho