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| Azevedo, Nuno Monteiro |
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Margetts, Lee
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024Actionable workflows for fusion neutronics simulation.
- 2021Non-local modelling of heat conduction with phase change
- 20204D characterisation of damage and fracture mechanisms of ultra high performance fibre reinforced concrete by in-situ micro X-Ray computed tomography testscitations
- 20184D Imaging of Soft Tissue and Implanted Biomaterial Mechanics; A Barbed-Suture Case Study for Tendon Repaircitations
- 2018Modelling fracture in heterogeneous materials on HPC systems using a hybrid MPI/Fortran coarray multi-scale CAFE frameworkcitations
- 2018Multiscale CAFE for fracture in heterogeneous materials under dynamic loading conditions
- 2017Multi-scale CAFE framework for simulating fracture in heterogeneous materials implemented in fortran co-arrays and MPIcitations
- 2017Micro X-ray Computed Tomography Image-based Two-scale Homogenisation of Ultra High Performance Fibre Reinforced Concretecitations
- 2009A finite element approach to the biomechanics of dromaeosaurid dinosaur claws
- 2008Investigating predictive capabilities of image-based modeling for woven composites in a scalable computing environment
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article
Micro X-ray Computed Tomography Image-based Two-scale Homogenisation of Ultra High Performance Fibre Reinforced Concrete
Abstract
A two-scale analytical-numerical homogenisation approach is developed to predict effective elastic properties of ultra high performance fibre reinforced concrete considering distribution of pore sizes acquired from 3D micro X-ray computed tomography (μXCT) images of 24.8 μm resolution. In the first scale, the mortar, consisting of sand, cement paste and a large number of small pores (10–600 μm), is homogenised using analytical Mori-Tanaka method with constituents’ moduli from micro-indentation. In the second, μXCT images of a 20 mm cube are converted to mesoscale representative volume elements for finite element homogenisation, with fibres and a small number of large pores (⩾600 μm) in the homogenised mortar. The resultant elastic moduli are compared favourably with experimental data. This approach accounts for a large number of pores with a wide size range yet without excessive computational cost. Effects of fibre volume fraction and orientation are investigated, demonstrating the approach’s potential to optimise the material’s micro-structure for desired properties.