Search results for "X-ray micro-tomography"

showing 3 items of 3 documents

X-ray micro-tomography based FEM modelling of hygroexpansion in PLA composites reinforced with birch pulp fibres

2017

This article presents a microscale modelling approach coupled with X-ray computed micro-tomography for the evaluation of material properties of polylactic acid (PLA) reinforced by birch pulp fibers under the effect of moisture. The results in terms of elastic moduli and hygroexpansion deformation were found in good agreement with the measurements taken at different levels of water uptake.

Materials sciencePLA compositesengineering.materialchemistry.chemical_compoundimage-based modelingPolylactic acidX-ray micro-tomographyFEM-ohjelmistotComposite materialta216Elastic modulusMicroscale chemistryta212hygroexpansionFEMta114MoistureMechanical EngineeringPulp (paper)X-rayFinite element methodimage-based modellingchemistryMechanics of MaterialsengineeringArtikkelitwooden fibersMaterial propertiesRakenteiden Mekaniikka
researchProduct

In situ analysis of garnet inclusion in diamond using single-crystal X-ray diffraction and X-ray micro-tomography

2012

A single crystal of garnet enclosed in a diamond from the Jericho kimberlite (Slave Craton, Canada) has been investigated using X-ray diffraction and X-ray micro-tomography. The novel experimental approach allowed us to determine the crystal structure of the garnet. The unit-cell edge a and fractional atomic coordinates of oxygen were used to determine the composition via an updated Margules model for garnets. The composition is Pyr(0.41(5))Alm(0.36(7))Gro(0.22(1))Uva(0.01(1)), which is indistinguishable from the eclogitic garnets found in other Jericho diamonds. We also demonstrated that residual pressures on the inclusion of up to 1 GPa do not affect significantly the determination of the…

Diffractiondiamond garnet inclusion residual pressure x-ray diffraction x-ray micro-tomography jericho kimberliteAnalytical chemistryMineralogyCrystal structureJericho kimberliteengineering.materialdiamondGeochemistry and PetrologyInclusionSettore GEO/06 - MineralogiaX-rayDiamondgarnetx-ray micro-tomographyX-ray diffractionresidual pressurex-ray microtomographydiamond; garnet; Inclusion; X-ray diffraction; x-ray microtomographyX-ray crystallographyengineeringInclusion (mineral)Single crystalKimberliteGeology
researchProduct

Analysis of fluid flow through porous media based on x-ray micro-tomographic reconstructions

2010

This thesis deals with creeping fluid flow through fibrous porous materials. Permeability through a porous medium is a measure of the ability of the material to transmit fluids. For testing and demonstration purposes the permeability values of a few fibrous heterogeneous materials, namely synthetic non-woven felt, wet pressing felt, cardboard, newsprint and hardwood paper, were measured experimentally. Reconstructions of the same materials under similar compression states were captured by x-ray micro-tomography. The actual microscopic pore structure thus obtained was utilised in the numerical lattice-Boltzmann analysis for solving the fluid flow permeability of the materials. Agreement betw…

imeytyminenvirtauslaskentapore structureaineen ominaisuudetröntgensäteilyläpäisevyysfluidivirtausx-ray micro-tomographyfysikaaliset ominaisuudethuokoisuusmikrotomografialattice Boltzmann methodimbibitionsingle phase fluid flowpermeabilityhuokosrakennecompressible porous media
researchProduct