| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Suhonen, Heikki
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024Protective role of wood hemicelluloses: Enhancing yeast probiotics survival in spray drying and storagecitations
- 2024Ductile shear damage micromechanisms studied by correlative multiscale nanotomography and SEM/EBSD for a recrystallized aluminum alloy 2198 T8citations
- 2024Multi-scale correlation of impact-induced defects in carbon fiber composites using X-ray scattering and machine learning
- 2023Combined X-ray diffraction tomography imaging of tension and opposite wood tissues in young hybrid aspen saplingscitations
- 2022Identifying Late Iron Age textile plant fibre materials with microscopy and X-ray methods — a study on finds from Ravattula Ristimäki (Kaarina, Finland)citations
- 2021Multiscale observation of ductile damage on an Aluminium alloy 2198 under shear
- 2021Quantitative analysis of feedstock structural properties can help to produce willow biochar with homogenous pore systemcitations
- 2019Quantifying Complex Micro-Topography of Degenerated Articular Cartilage Surface by Contrast-Enhanced Micro-Computed Tomography and Parametric Analysescitations
- 2012Non-destructive 3-D reconstruction of the martensitic phase in a dual-phase steel using synchrotron holotomographycitations
- 2012Non-destructive 3-D reconstruction of the martensitic phase in a dual-phase steel using synchrotron holotomographycitations
Places of action
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conferencepaper
Multiscale observation of ductile damage on an Aluminium alloy 2198 under shear
Abstract
International audience ; In search of the lighter materials and optimized thin-walled components especially for transportation purposes, knowledge about the characteristic ductile damage mechanisms related to their failure, reliability, lifetime etc. in aluminium sheets is crucially needed in manyfold engineering application. Recent reserach has addressed a complex and empirical relationship between strain to fracture and low stress triaxiality below 1 [1] but physical damage mechanisms still remain unclear. Initial void shapes and their shape changes during deformation may be at the origin of the unexpected material failure. In addition, the stages of void nucleation, void shape change and void coalescence are still poorly understood as they are hardly observed experimentally maintaining relevant stress conditions [2].To overcome the inherent shortcomings of other 3D technique on flat sample, advanced techniques in situ synchrotron microlaminography and ex situ nanolaminography provide information from a few hundred micrometers resolution down to the nanometer scale, allowing the ductile damage nucleation and growth kinetics in metal sheets to be studied. A ‘smiley’ shear sample geometry [3] of 1 mm thick sheet made from a latest generation of recrystallized Al-Cu-Li alloy 2198 in T8 condition [4] is chosen to study its shear damage mechanisms down to 50 nm (voxel size) resolution for a test stopped before fracture.The damage features, including oriented cluster of micro-void cracks and damage linked to intermetallic particles, are found at highly-deformed shear band region. The detrimental flat cracks are proved to be intergranular via EBSD analysis. Cracks are also found to nucleate with intermetallic particles and grow during shearing, due to the constraint of the stiff particles. Shear bands on micrometer scale and dispersoids on nanometer scale are observed via SEM, and the latter are probably linked to the onset of micro-void nucleation by fractography of the fractured in situ sample.Reference[1] Y. Bao, ...