Browsing by Keyword "CFRP"
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Item Development and application of FASSTbridge solution to Jarama bridge (fast and effective solution for steel bridges lifetime extension)(International Association for Bridge and Structural Engineering (IABSE), 2018) Chataigner, Sylvain; Benzarti, Karim; Foret, Gilles; Caron, Jean François; Quiertant, Marc; Zalbide, Maria; Garcia, David; Calderon, Inigo; Pinero, Ignacio; Gemignani, Gianluca; Birtel, Veit; Lehmann, Frank; Wahbeh, Mazen; Boundouki, Rami; Martin, Elena; Sopena, Luis; Weidemueller, Mark; Fischer, Michael; Iborra, Concepcion; E&I SEGURAS Y RESILIENTES; Tecnalia Research & InnovationOne of the goals of sustainable development applied to bridge infrastructure is to provide bridge owners with strengthening solutions that may lead to an increase of existing structures service life. In the case of steel bridges, the assessment of the remaining service life is most often linked to the determination of the structural deterioration caused by corrosion and fatigue. Damage caused by fatigue is very difficult to assess before crack initiation, and is more bound to occur in old structures, for which the phenomenon was not taken into account in design before 1970. In addition, old steel materials present a more brittle behavior. In answer to these challenges, the FASSTbridge project, financed through European Infravation call, aimed at developing a pre-cracking fatigue assessment and strengthening methodology for steel bridges based on the technology of adhesively bonded composite. The proposed article presents some of the results of this project.Item Drilling of CFRP-Ti6Al4V stacks using CO2-cryogenic cooling(2021-04) Rodríguez, A.; Calleja, A.; de Lacalle, L. N.López; Pereira, O.; Rubio-Mateos, A.; Rodríguez, G.; FABRIC_INTELIn the work here presented, liquefied CO2 is used as cutting fluid for drilling CFRP-Ti6Al4V stacks as alternative to dry-drilling. Several tests were performed using dry-drilling technique, to compare this with the performance of CO2 cryogenic cooling. This work shows the feasibility of the proposed alternative, not only regarding technical issues but also environmental concerns. Results show that when CO2 is used in drilling, hole diameter values diverge below 0.5 % from nominal values, tool tip temperature is drastically reduced, and surface integrity of CFRP layers are preserved. Drilling tool edges damage is reduced and so tool life extended. In short, dry-drilling process was notably improved by CO2 assistance in comparison with dry drilling.Item An experimental study on abrasive waterjet cutting of CFRP/Ti6Al4V stacks for drilling operations(2016-09-01) Alberdi, A.; Artaza, T.; Suárez, A.; Rivero, A.; Girot, F.; FABRIC_INTEL; SGIn the present study, CFRP/Ti6Al4V stacks were machined with abrasive water jet using different process parameters in order evaluate the viability of AWJ industrial application as a substitute of conventional drilling. The effect of the stack configuration, the traverse feed rate, the cutting tool (combination of orifice and focusing tube diameter and abrasive mass flow rate), and the pressure over the kerf profile, taper angle, and surface roughness has been analyzed through an ANOVA analysis and related to the physical parameters of the AWJ process. As a result, a positive taper angle is observed in Ti6Al4V while a negative is observed in CFRP in almost all cutting conditions. This leads to obtain an X-type or barrel-type kerf profile depending on the stack configuration. In addition, the surface roughness can be as low as 6.5 μm in both CFRP and Ti6Al4V materials at 95 mm/min when CFRP/Ti6Al4V configuration is used.Item Fasstbridge methodology and strengthening system: The Jarama Bridge experience(International Institute for FRP in Construction (IIFC), 2018) García-Sánchez, David; Wabeh, Mazen; Fischer, Michael; Chataigner, Sylvain; Sopeña, Luis; Birtel, Veit; Ferrier, Emmanuel; Benzarti, Karim; Caron, Jean-Francois; E&I SEGURAS Y RESILIENTESSteel bridges present frequent fatigue problems that reduce their load-carrying capacity and residual life. The increase of traffic flows and loads in the last decades has enhanced this problem, especially on ageing structures. This phenomenon is very dangerous because a conventional structural stress analysis might result in misleading conclusions about safety. In Europe, 15% of the 300 000 bridges are made of steel or concrete-steel composite structures, and approximately 68% of them need structural interventions. In the USA, figures are quite similar. Having this in mind, in November 2015, the ERA-NET Plus project FASSTBRIDGE was launched aiming at developing a complete methodology including a calculation method for assessing the remaining life of steel bridge in terms of fatigue, a designing and applying method for the strengthening intervention, and a strengthening system relying on the use of adhesively bonded CFRP (Carbon Fiber Reinforced Polymer). The paper presents the FASSTbridge methodology and strengthening system, which have been designed to work with codes based on The American Association of State Highway and Transportation Officials (AASHTO) or the European Union's Eurocode and its implementation in Jarama Bridge (Madrid, Spain).Item Industrial cure monitoring and control of the RTM production of a CFRP automotive component(European Conference on Composite Materials, ECCM, 2012) Pantelelis, Nikos; Nedelec, Gilles; Amosse, Yannick; Toitgans, Marc Philippe; Beigbeder, Alexandre; Harismendy, Isabel; Mezzacasa, Ricardo; Zhang, Jie; Bistekos, Efthymios; POLIMEROS; COMPOSITEA self-learning process monitoring and automatic control system has been developed to provide optimal and straightforward solutions for a wide range of resins and applications without particular investment and knowledge from the manufacturers' side. Three different liquid moulding applications were used as the testing bed for the technologies covering a wide range of processing conditions (polyesters and epoxies, fast and slow cure cycles, carbon and glass fibres) with products from automotive to composite bridges. At the first application in high-speed RTM, the new system did prove its advantages in monitoring and control an RTM epoxy CFRP production achieving acceleration of more than 10% in existing production and potentially up to 40% through an additional optimisation step.Item Phase Velocity Method for Guided Wave Measurements in Composite Plates(2015) Moreno, E.; Galarza, N.; Rubio, B.; Otero, J.A.; SMART_MONCarbon Fiber Reinforced Polymer is a well-recognized material for aeronautic applications. Its plane structure has been widely used where anisotropic characteristics should be evaluated with flaw detection. A phase velocity method of ultrasonic guided waves based on a pitch-catch configuration is presented for this purpose. Both shear vertical (SV) and shear horizontal (SH) have been studied. For SV (Lamb waves) the measurements were done at different frequencies in order to evaluate the geometrical dispersion and elastic constants. The results for SV are discussed with an orthotropic elastic model. Finally experiments with lamination flaws are presented.