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Fracture toughness determination of adhesive and co-cured joints in natural fib...
Campilho, Raul; Moura, Daniel; Gonçalves, Daniel; Silva, João; Banea, Mariana D.; Silva, Lucas F. M. daAdhesive bonding has become more efficient in the last few decades due to the adhesives developments, granting higher strength and ductility. On the other hand, natural fibre composites have recently gained interest due to the low cost and density. It is therefore essential to predict the fracture behavior of joints between these materials, to assess the feasibility of joining or repairing with adhesives. In th...
Tensile behaviour of a structural adhesive at high temperatures by the extended...
Campilho, Raul; Banea, Mariana D.; Silva, Lucas F. M. daComponent joining is typically performed by welding, fastening, or adhesive-bonding. For bonded aerospace applications, adhesives must withstand high-temperatures (200°C or above, depending on the application), which implies their mechanical characterization under identical conditions. The extended finite element method (XFEM) is an enhancement of the finite element method (FEM) that can be used for the strengt...
Modelling adhesive joints with cohesive zone models: effect of the cohesive law...
Campilho, Raul; Banea, Mariana D.; Neto, José; Silva, Lucas F. M. daAdhesively-bonded joints are extensively used in several fields of engineering. Cohesive Zone Models (CZM) have been used for the strength prediction of adhesive joints, as an add-in to Finite Element (FE) analyses that allows simulation of damage growth, by consideration of energetic principles. A useful feature of CZM is that different shapes can be developed for the cohesive laws, depending on the nature of ...
Repair of composite and wood structures
Campilho, Raul Duarte Salgueiral GomesTese de doutoramento. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto, Universidade de Trás-os-Montes e Alto Douro, Instituto Superior de Engenharia do Porto. 2009
Modelação da execução de reparações em materiais compósitos
Campilho, Raul Duarte Salgueiral GomesTese de mestrado. Engenharia Mecânica. 2005. Faculdade de Engenharia. Universidade do Porto
Strength improvement of adhesively-bonded joints using a reverse-bent geometry
Campilho, Raul; Pinto, A. M. G.; Banea, Mariana D.; Silva, R. F.; Silva, Lucas F. M. daAdhesive bonding of components has become more efficient in recent years due to the developments in adhesive technology, which has resulted in higher peel and shear strengths, and also in allowable ductility up to failure. As a result, fastening and riveting methods are being progressively replaced by adhesive bonding, allowing a big step towards stronger and lighter unions. However, single-lap bonded joints st...
Tensile behaviour of single and double-strap repairs on aluminium structures
Pinto, A. M. G.; Campilho, Raul; Mendes, Isabel R.; Silva, R. F.; Magalhães, A. G.; Baptista, A. P. M.In this work, an experimental study was performed on the influence of plug filling, loading rate and temperature on the tensile strength of single-strap (SS) and double-strap (DS) repairs on aluminium structures. The experimental programme includes repairs with different values of overlap length (LO=10, 20 and 30 mm), and with and without plug filling. The influence of the testing speed on the repairs streng...
Using a cohesive damage model to predict the tensile behaviour of CFRP single-s...
Campilho, Raul; Moura, M. F. S. F. de; Domingues, J. J. M. S.This work addresses both experimental and numerical analyses regarding the tensile behaviour of CFRP single-strap repairs. Two fundamental geometrical parameters were studied: overlap length and patch thickness. The numerical model used ABAQUS® software and a developed cohesive mixed-mode damage model adequate for ductile adhesives, and implemented within interface finite elements. Stress analyses and strength ...
Taper angle optimization of scarf repairs in carbon-epoxy laminates
Campilho, Raul; Pinto, A. M. G.; Moura, M. F. S. F. de; Mendes, Isabel R.; Banea, Mariana D.; Silva, Lucas F. M. daThe increasing use of Carbon-Fibre Reinforced Plastic (CFRP) laminates in high responsibility applications introduces an issue regarding their handling after damage. The availability of efficient repair methods is essential to restore the strength of the structure. The availability of accurate predictive tools for the repairs behaviour is also essential for the reduction of costs and time associated to extensiv...
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