Search results for "BEAMS"

showing 10 items of 268 documents

Graded reflectivity micromirror arrays

2002

A technique for fabricating arrays of graded reflectivity micromirrors with diameters as small as 25 microm is reported. It is based on laser-induced physical vapor deposition through microholes on a thin free-standing noncontact mask, and it is suitable for applications in micro-optics and solid-state laser technology.

Laser technologyMaterials scienceOpticsbusiness.industryMaterials Science (miscellaneous)Physical vapor depositionOptoelectronicsBusiness and International ManagementbusinessOptical arraysReflectivityIndustrial and Manufacturing EngineeringLaser beamsApplied Optics
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A fractional viscoelastic non-local Timoshenko beam

2014

Long-range interactions Fractional hereditary nano beams Non-local hereditarinessSettore ICAR/08 - Scienza Delle Costruzioni
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MECHANICAL RESPONSE OF BERNULLI EULER BEAMS ON FRACTIONAL ORDER ELASTIC FOUNDATION

2014

Long-range interactions non-local foundations elastic beams fractional calculusSettore ICAR/08 - Scienza Delle Costruzioni
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Toward a wave turbulence formulation of statistical nonlinear optics

2012

International audience; During this last decade, several remarkable phenomena inherent to the nonlinear propagation of incoherent optical waves have been reported in the literature. This article is aimed at providing a generalized wave turbulence kinetic formulation of random nonlinear waves governed by the nonlinear Schrodinger equation in the presence of a nonlocal or a noninstantaneous nonlinear response function. Depending on the amount of nonlocal (noninstantaneous) nonlinear interaction and the amount of inhomogeneous (nonstationary) statistics of the incoherent wave, different types of kinetic equations are obtained. In the spatial domain, when the incoherent wave exhibits fluctuatio…

MODULATION INSTABILITYFIBER LASERLangmuir TurbulenceWave propagationWave turbulencePROPAGATION01 natural sciencesKERR MEDIA010305 fluids & plasmassymbols.namesakeLINEAR ENERGY TRANSFERINCOHERENT-LIGHT BEAMS[MATH.MATH-ST]Mathematics [math]/Statistics [math.ST]0103 physical sciences010306 general physicsNonlinear Schrödinger equationPHOTOREFRACTIVE MEDIAPhysicsSPATIAL SOLITONSSUPERCONTINUUM GENERATIONVlasov equationStatistical and Nonlinear Physics[STAT.TH]Statistics [stat]/Statistics Theory [stat.TH]THERMALIZATIONAtomic and Molecular Physics and Optics[MATH.MATH-PR]Mathematics [math]/Probability [math.PR]Nonlinear systemModulational instabilityClassical mechanicssymbolsSolitonJournal of the Optical Society of America B
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Increasing the shear capacity of reinforced concrete beams using pretensioned stainless steel ribbons

2017

In this work, the second part of an experimental campaign investigating the efficiency of an alternative retrofitting method for increasing the flexural and/or shear capacity in reinforced concrete beams, based on the use of prestressed stainless steel ribbons and steel angles, is presented and analytically reproduced. This group of tests focuses on the ability of the adopted retrofitting method to improve the shear strength and ultimate deformation of reinforced concrete structural elements. As described in a companion paper, the adopted retrofitting method is alternative to traditional techniques of reinforced concrete retrofitting, being easy to install and usually reversible, and charac…

Materials science0211 other engineering and technologies020101 civil engineering02 engineering and technologyfib Model Code 20100201 civil engineeringCAM; fib Model Code 2010; reinforced concrete beams; retrofitting; shear; stainless steel ribbons; Civil and Structural Engineering; Building and Construction; Materials Science (all); Mechanics of MaterialsRetrofitting021105 building & constructionReinforced concrete beamRetrofittingGeneral Materials ScienceCivil and Structural EngineeringCAMbusiness.industryShearStructural engineeringBuilding and ConstructionReinforced concreteStainless steel ribbonShear (sheet metal)Settore ICAR/09 - Tecnica Delle CostruzioniMechanics of MaterialsMaterials Science (all)businessShear capacity
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Stress transfer and failure mechanisms in steel-concrete trussed beams: Experimental investigation on slab-thick and full-thick beams

2018

Abstract This study presents the results of an experimental investigation on semi-precast Hybrid Steel Trussed-Concrete Beams (HSTCBs) for analyzing the failure modes and the stress transfer mechanism between concrete and embedded steel elements (plate and truss). The available literature presents previous studies carried out by the authors mainly focused on the understanding of the local transfer mechanism by means of push-out tests. Conversely, in this paper original the results of laboratory tests conducted on six specimens of full-size HSTCBs subjected to four-point bending, with variation in the shear span, are reported on. From these results, the authors are able to assess the failure…

Materials science0211 other engineering and technologiesFour-point bending testTruss020101 civil engineering02 engineering and technology0201 civil engineeringAnalytical modeling; Experimental investigation; Four-point bending tests; Hybrid steel trussed-concrete beams; Stress transfer length; Civil and Structural Engineering; Building and Construction; Materials Science (all)Analytical modelingDeflection (engineering)021105 building & constructionTransfer mechanismGeneral Materials ScienceHybrid steel trussed-concrete beamStress transfer lengthStrain gaugeCivil and Structural EngineeringExperimental investigationbusiness.industryBuilding and ConstructionStructural engineeringSettore ICAR/09 - Tecnica Delle CostruzioniHybrid steel trussed-concrete beamsSlabMaterials Science (all)businessFour-point bending testsBeam (structure)Construction and Building Materials
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Optical non-contact electric field mapping by LIF in Cs vapor

2007

We present experimental and theoretical studies of the possibility of using cesium vapor as a tracer gas for optical non-contact electric field mapping. Optical images of electric field distributions have been obtained.

Materials scienceCesium vaporMolecular physicssymbols.namesakeStark effectElectric fieldTRACERsymbolsMaxwell-Bloch equationsPhysics::Atomic PhysicsAtomic physicsLaser-induced fluorescenceAstrophysics::Galaxy AstrophysicsLaser beams
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Computational Study of Failure of Hybrid Steel Trussed Concrete Beams

2017

This study investigates the failure behavior of hybrid steel trussed concrete beams (HSTCBs) under three-point bending through a series of finite-element (FE) simulations. The FE model employs well-established constitutive relations of concrete and steel with a simplified contact condition between the concrete and steel truss. The numerical model is compared with existing experimental data as well as a FE model that uses a more sophisticated concrete-steel interfacial model. The comparison shows that the present model is able to capture various failure mechanisms of the beam and its peak load capacity. The model is applied to investigate the behavior of a set of HSTCBs of different sizes, w…

Materials scienceConcrete beams0211 other engineering and technologies020101 civil engineering02 engineering and technologyBendingComposite beams0201 civil engineeringSize and geometrical effectsSize and geometrical effect021105 building & constructionGeneral Materials ScienceCivil and Structural EngineeringSeries (mathematics)business.industryMetal and composite structuresMechanical EngineeringComposite beam; Finite-element modeling; Fracture; Size and geometrical effects; Metal and composite structuresBuilding and ConstructionStructural engineeringFinite-element modelingFinite element methodFractureMechanics of MaterialsFracture (geology)Fe modelComposite beambusinessJournal of Structural Engineering
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Flexural and Shear Resistance of Steel Fiber–Reinforced Lightweight Concrete Beams

2014

In the present paper an analytical model is proposed that is able to determine the shear resistance of lightweight reinforced concrete beams with longitudinal bars, in the presence of reinforcing steel fibers. The model is based on the evaluation of the resistance contribution resulting from beam and arch actions. For the resistance contribution of main bars in tension, the residual bond adherence of steel bars and the crack spacing of reinforced concrete (RC) beams in the presence of fibers are considered. The contribution in terms of postcracking resistance in the tension zone of the beams is also included. The model was verified on the basis of experimental data available in the literatu…

Materials scienceConcrete beamsbusiness.industryMechanical EngineeringShear resistanceBuilding and ConstructionStructural engineeringResiduallightweigth concrete beams shearSettore ICAR/09 - Tecnica Delle CostruzioniFlexural strengthShear (geology)Mechanics of MaterialsUltimate tensile strengthGeneral Materials ScienceArchbusinessBeam (structure)Civil and Structural EngineeringJournal of Structural Engineering
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Analytical solution for composite layered beam subjected to uniformly distributed load

2016

ABSTRACTThe article presents an analytical theory for multilayered composite beams subjected to transverse uniformly distributed loads. The formulation is based on a layerwise model characterized by third-order approximation of the axial displacements and fourth-order approximation of the transverse displacements. The layerwise kinematical model is rewritten in terms of generalized variables. The beam equilibrium equations, expressed in terms of stress resultant, allow writing the boundary value governing problem. The layerwise fields are obtained by postprocessing steps. The main advantage is to ensure the accuracy level associated to the layerwise formulations preserving the computational…

Materials scienceGeneral MathematicsComposite number02 engineering and technologyEquilibrium equationBoundary valuesComposite beamsStress (mechanics)0203 mechanical engineeringdistributed loadMathematics (all)General Materials ScienceMechanics of MaterialSettore ING-IND/04 - Costruzioni E Strutture AerospazialiKinematical modelcomposite laminateCivil and Structural Engineeringbusiness.industryMechanical EngineeringMathematical analysisStructural engineering021001 nanoscience & nanotechnologyanalytical solutionTransverse plane020303 mechanical engineering & transportsMechanics of MaterialsMaterials Science (all)Beam theory0210 nano-technologybusinessBeam (structure)
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