DMMCTE - DEL - Comunicaciones en Congresos y otros eventos

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    Longitudinal supports shape influence on deflection and stresses in solar receiver tubes
    (European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2022-09) Montoya Sancha, Andrés; López Puente, Jorge; Santana Santana, Domingo José; Ministerio de Ciencia e Innovación (España)
    Longitudinal supports have a key role in solar central receivers, preventing tubes from excessive deflection. In this work, its influence on tube deflection and thermo-mechanical stresses has been studied. In exiting literature, the longitudinal supports are not modelled when the behaviour of solar receiver tubes is studied. In this research, they have been considered developing numerical models using a finite element analysis software. To carry out the analysis, a new geometry of the metal sheet attached to the receiver tubes has been proposed. With this new shape, different cases have been studied, varying the separation between supports and their size to study its impact on stress and deflection in the tubes. Results have shown that extremely rigid supports may induce additional stress in the receiver tube. With the geometry considered in this research, supports do not cause additional mechanical stress in tubes. Small supports are preferred to bigger ones due to the stresses arisen in the own support.
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    Modeling high-speed impact on CFRP's with an energy balance equation
    (DYMAT, 2010) López Puente, Jorge; Varas Doval, David; Loya Lorenzo, José Antonio; Navarro Ugena, Carlos; Zaera, Ramón
    In this work an analytical model has been developed in order to predict the residual velocity of a spherical or cylindrical steel projectile, after impacting into a woven carbon/epoxy thin laminate. The model is based in an energy balance, in which the kinetic projectile energy is absorbed by the laminate through three different mechanisms: linear momentum transfer, fiber failure and laminate crushing. This last mechanism needs the quantification of the through-thickness compressive strength, which has been evaluated by means of quasi-static punch tests. Finally, high velocity impact tests have been accomplished in a wide range of velocities, to validate the model.
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    Photo-termo-elastic behaviour of a PMMA-core POF
    (Copy Red, S.A., 2013) Pérez Castellanos, José Luis; Sánchez Montero, David Ricardo; Vázquez García, María Carmen; Zahr Viñuela, Jorge Alonso
    The use of fiber optic sensing systems of mechanical elements are based, among others, on light variations versus strain. This paper shows the results of tensile tests on a PMMA-core POF with simultaneous measurement of both optical intensity and temperature changes.