F. Naya
IMDEA
Service lifeComposite numberDrop (liquid)Finite element methodFiber bundleNonlinear systemComposite materialRepresentative elementary volumeEpoxyAerospaceGlass fiberMicroscale chemistryCompression (physics)Materials scienceConstitutive equationTension (physics)Ultimate failureStiffnessCharacterization (materials science)Damage mechanicsThermoplasticVirtual testNonlinear finite element analysisMicromechanicsComputer scienceComputer simulationFiberComputed tomographyStructural engineeringFibre-reinforced plasticShear (sheet metal)MicrostructureFracture toughness
19Publications
9H-index
402Citations
Publications 17
Newest
#1J.I. Múgica (IMDEA)H-Index: 1
#2Claudio S. Lopes (IMDEA)H-Index: 24
Last. C. González (UPM: Technical University of Madrid)H-Index: 4
view all 6 authors...
Abstract The mechanical properties of woven composites can be predicted by using a multiscale modelling approach. The starting point to its application is the microscale (the level of fibres, matrix and interfaces), that allows the computation of the homogenised behaviour of the yarn. The aim of this work was to predict the yarn-level behaviour of a thermoplastic-based woven composite in order to allow the formulation of a representative constitutive model that can be used to predict ply propert...
3 CitationsSource
#1Sandip Haldar (IMDEA)H-Index: 9
#2Miguel González Herráez (UPM: Technical University of Madrid)H-Index: 12
Last. Claudio S. Lopes (IMDEA)H-Index: 24
view all 5 authors...
Abstract The translaminar fracture behaviors of partially different unidirectional composite systems, constituted by the same carbon fibers but different (thermoset vs. thermoplastic) matrices, were characterized by means of compact tension fracture tests. The resulting crack resistance curves (R-curves) and fracture surfaces, were studied in detail and found to be rather different between those material systems, in spite of the same reinforcing fibers at similar volume fractions. In the attempt...
3 CitationsSource
#1F. Naya (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 9
#1F. Naya (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 1
Last. John Botsis (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 37
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Abstract Fiber reinforced polymers (FRPs) subjected to mode I fracture show important toughening due to the development of large scale bridging (LSB). Experimental studies of this phenomenon in unidirectional carbon/epoxy laminates using double cantilever beam specimens, demonstrate important differences in R-curve response for inter- and intralaminar fracture. Post fracture observation of composite’s cross-section pointed out dissimilar fiber bundle size and shape, as the main origin of their d...
15 CitationsSource
#1S. Sadaba (IMDEA)H-Index: 5
#2Miguel González Herráez (UPM: Technical University of Madrid)H-Index: 12
Last. Claudio S. Lopes (IMDEA)H-Index: 24
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Abstract A novel methodology is presented to introduce Periodic Boundary Conditions (PBC) on periodic Representative Volume Elements (RVE) in Finite Element (FE) solvers based on dynamic explicit time integration. This implementation aims at overcoming the difficulties of the explicit FE method in dealing with standard PBC. The proposed approach is based on the implementation of a user-defined element, named a Periodic Boundary Condition Element (PBCE), that enforces the periodicity between peri...
12 CitationsSource
#1Wei Tan (University of Cambridge)H-Index: 12
#1Wei Tan (University of Cambridge)H-Index: 13
Last. Javier LLorca (UPM: Technical University of Madrid)H-Index: 73
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Abstract The development of the latest generation of wide-body passenger aircraft has heralded a new era in the utilisation of carbon-fibre composite materials. One of the primary challenges facing future development programmes is the desire to reduce the extent of physical testing, required as part of the certification process, by adopting a ‘certification by simulation’ approach. A hierarchical bottom-up multiscale simulation scheme can be an efficient approach that takes advantage of the natu...
47 CitationsSource
#1F. Naya (IMDEA)H-Index: 9
#2Miguel González Herráez (IMDEA)H-Index: 12
Last. F. Pons (EADS: Airbus)H-Index: 2
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Abstract The determination of ply properties of Fiber Reinforced Polymers (FRP) for particular operational environmental conditions in aeronautical applications is mandatory in order to fulfill current industry stringent certification requirements. However, the traditional experimental approach requires massive investments of resources and time. From the behaviour obtained experimentally, constitutive equations including failure criteria are then devised to be used in the design of FRP structure...
59 CitationsSource
#1Carlos MedinaH-Index: 32
#2E. FernandezH-Index: 2
Last. Paulo FloresH-Index: 14
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The mechanical properties of the matrix and the fiber/matrix interface have a relevant influence over the mechanical properties of a composite. In this work, a glass fiber-reinforced composite is manufactured using a carbon nanotubes (CNTs) doped epoxy matrix. The influence of the CNTs on the material mechanical behavior is evaluated on the resin, on the fiber/matrix interface, and on the composite. On resin, the incorporation of CNTs increased the hardness by 6% and decreased the fracture tough...
8 CitationsSource
#1O. Falcó (IMDEA)H-Index: 7
#2Claudio S. Lopes (IMDEA)H-Index: 24
Last. Joan A. MayugoH-Index: 21
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Abstract The introduction of Variable-Stiffness Laminates requires not only the use of advanced numerical simulation tools but also better understanding of manufacturing induced effects. These computational tools can give beneficial insight that will lead to an effective reduction of test campaigns as well as to increase design possibilities. This paper presents a virtual testing approach to study the influence of tow-drop effects, generated in the manufacturing of steered-fibre composites, by m...
22 CitationsSource
#1O. FalcóH-Index: 7
#2Claudio S. LopesH-Index: 24
view all 6 authors...
The introduction of Variable-Stiffness Laminates requires not only the use of advanced numerical simulation tools but also better understanding of manufacturing induced effects. These computational tools can give beneficial insight that will lead to an effective reduction of test campaigns as well as to increase design possibilities. This paper presents a virtual testing approach to study the influence of tow-drop effects, generated in the manufacturing of steered-fibre composites, by means of n...
#1F. NayaH-Index: 9
Last. F. PonsH-Index: 2
view all 5 authors...
Qualification of Fiber Reinforced Polymer materials (FRP’s) for manufacturing of structural components in the aerospace industry is usually associated with extensive and costly experimental campaigns. The burden of testing is immense and materials should be characterized under different loading states (tension, compression, shear) and environmental conditions (temperature, humidity) to probe their structural integrity during service life. Recent developments in multiscale simulation, together wi...