S. Sadaba
IMDEA
Composite numberInterface (computing)StiffeningShieldsPeriodic boundary conditionsUltimate tensile strengthFuselageNuclear engineeringConceptual designEngineeringFinite element methodMatrix (mathematics)ShieldMultiscale modelingStructural dynamicsComposite laminatesCurrent (fluid)Integrated computational materials engineeringMechanical jointNonlinear systemComposite materialTomographyThermal conductionBulk temperatureThermodynamic cycleChemistryMaterials scienceRange (mathematics)Structural materialDeformation (meteorology)ThermalAirframeScheme (programming language)Dynamic loadingTest (assessment)Loss-of-coolant accidentBlanketCouponX-rayPlateau (mathematics)IndentationMechanical PhenomenaHeat transfer coefficientExplicit time integrationEnergy absorptionVirtual testFluid transportImpact loadingTransient (oscillation)Polygon meshMicromechanicsHomogenization (chemistry)Computer scienceCertificationComputer simulationFiberHeliumCohesive zone modelResponse spectrumStructural engineeringEnvelope (mathematics)DelaminationSize effect on structural strengthWater coolingSubroutine
12Publications
5H-index
325Citations
Publications 11
Newest
#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
view all 6 authors...
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
#1R. MuñozH-Index: 6
Last. Yves PoitevinH-Index: 23
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Abstract European test blanket modules (TBMs) are attached to radiation shields through mechanical joints. The structural integrity of the joints must be ensured under non-periodic dynamic loading caused by accidental electromagnetic events. This requires the transient dynamic analysis of the TBM-Joint-Shield under multiple loading scenarios. As temperatures and dynamic characteristics of the TBM-Joint-Shield system are updated under the course of the ITER project, the design process of the join...
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#1S. SadabaH-Index: 5
Last. Yves Pointevin (Fusion for Energy)
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The ITER reactor is characterized by the high heat fluxes due to plasma direct radiation, and the neutron radiation generating volumetric heat sources. This heat is applied in transient pulses, and needs to be removed by the cooling system to keep the peak temperatures of the steel components sufficiently low. In the case of the EU-TBM (HCPB and HCLL in Port#16 of ITER), the structural material is Eurofer97, which is cooled by Helium flowing through channels inside the material. The interest of ...
#1Joelle Vallory (Fusion for Energy)H-Index: 6
#2Dobromir Panayotov (Fusion for Energy)H-Index: 6
Last. A. GilH-Index: 1
view all 7 authors...
Abstract Europe is developing two reference tritium breeder blanket concepts that will be tested in ITER under the form of Test Blanket Modules (TBMs): the helium–cooled lithium–lead (HCLL) which uses the liquid Pb–16Li as both breeder and neutron multiplier and the helium–cooled pebble-bed (HCPB) with lithiated ceramic pebbles as breeder and beryllium pebbles as neutron multiplier. Both concepts are using the EUROFER reduced activation ferritic–martensitic steel as structural material and press...
11 CitationsSource
#1Claudio S. Lopes (IMDEA)H-Index: 24
#2S. Sadaba (IMDEA)H-Index: 5
Last. Pedro P. Camanho (University of Porto)H-Index: 70
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Abstract A high-fidelity virtual tool for the numerical simulation of low-velocity impact damage in unidirectional composite laminates is proposed. A continuum material model for the simulation of intraply damage phenomena is implemented in a numerical scheme as a user subroutine of the commercially available Abaqus finite element package. Delaminations are simulated using of cohesive surfaces. The use of structured meshes, aligned with fiber directions allows the physically-sound simulation of ...
69 CitationsSource
#1M. Zmitko (Fusion for Energy)H-Index: 12
#2Joelle Vallory (Fusion for Energy)H-Index: 6
Last. A.V. Fedorov (Nuclear Research and Consultancy Group)H-Index: 6
view all 21 authors...
#1S. Sadaba (IMDEA)H-Index: 5
#2Ignacio Romero (UPM: Technical University of Madrid)H-Index: 16
Last. Javier LLorca (UPM: Technical University of Madrid)H-Index: 73
view all 4 authors...
Summary Ignoring crack tip effects, the stability of the X-FEM discretizations is trivial for open cracks but remains a challenge if we constrain the crack to be closed (i.e., the bi-material problem). Here, we develop a formulation for general cohesive interactions between crack faces within the X-FEM framework. The stability of the new formulation is demonstrated for any cohesive crack stiffness (including the closed crack) and illustrated for a nonlinear cohesive softening law. A benchmark of...
12 CitationsSource
#1S. Sadaba (IMDEA)H-Index: 5
#2Francisca Martinez-Hergueta (IMDEA)H-Index: 6
Last. Javier LLorca (UPM: Technical University of Madrid)H-Index: 73
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This chapter proposes a systematic simulation strategy to determine the mechanical behaviour of composite laminates under impact loading using a computational mesomechanics approach. The methodology includes modelization of the physical mechanisms of damage observed in laminates: intralaminar (ply failure) and interlaminar (delamination failure). The methodology was applied to analyse the impact behaviour of carbon–epoxy laminates subjected to low- and high-velocity impacts, and the results were...
6 CitationsSource
#1Federico SketH-Index: 17
#2Alejandro EnfedaqueH-Index: 18
Last. Javier LLorcaH-Index: 73
view all 7 authors...
This research focused on the evaluation of damage formation on ±45o carbon fiber laminates subjected to tensile tests. The damage was evaluated by means of X-ray tomography. A high density of cracks developed during the plateau of the stress-strain curve and were qualitatively analyzed, showing that the inner plies eventually developed a higher crack concentration than the outer plies. Delamination started to occur in the outermost ply interface when the slope after the plateau of the stress-str...
#1Javier LLorca (UPM: Technical University of Madrid)H-Index: 73
#2Carlos González (UPM: Technical University of Madrid)H-Index: 42
Last. Luis P. Canal (UPM: Technical University of Madrid)H-Index: 11
view all 10 authors...
A bottom-up, multiscale modeling approach is presented to carry out high-fidelity virtual mechanical tests of composite materials and structures. The strategy begins with the in situ measurement of the matrix and interface mechanical properties at the nanometer-micrometer range to build up a ladder of the numerical simulations, which take into account the relevant deformation and failure mechanisms at different length scales relevant to individual plies, laminates and components. The main featur...
223 CitationsSource