| 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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Brassart, Laurence
University of Oxford
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2021Visco-Plastic Behaviour of a Polymer Matrix at the Fibre Diameter Length Scale: a Finite Element Mesoscale Model Relying on Shear Transformation Zone (STZ) Dynamics
- 2021Implementation and calibration of a mesoscale model for amorphous plasticity based on shear transformation dynamicscitations
- 2019Strain rate dependence of the contribution of surface diffusion to bulk sintering viscositycitations
- 2019Impact of second phase morphology and orientation on the plastic behavior of dual-phase steelscitations
- 2018Interfacial fibre decohesion in Friction Stir Processed Mg-C composites under tensile and compression loading
- 2017Micro-mechanical testing of magnesium based composites reinforced by carbon fibers manufactured by friction stir processing
- 2017Micro-mechanical testing of magnesium based composites reinforced by carbon fibers manufactured by friction stir processing
- 2016Influence of martensite volume fraction and hardness on the plastic behavior of dual-phase steels: Experiments and micromechanical modelingcitations
- 2016Influence of martensite volume fraction and hardness on the plastic behavior of dual-phase steels: Experiments and micromechanical modelingcitations
- 2014The influence of microstructure and composition on the plastic behaviour of dual-phase steelscitations
- 2011Homogenization of elasto-(visco)plastic composites : history-dependent incremental and variational approaches
- 2011A variational formulation for the incremental homogenization of elasto-plastic compositescitations
Places of action
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article
Strain rate dependence of the contribution of surface diffusion to bulk sintering viscosity
Abstract
Modeling of bulk sintering viscosity usually neglects the contribution of pore surface diffusion with respect to grain‐boundary diffusion. This approximation is questionable at the high densification rates used today in advanced fast sintering techniques. A two‐dimensional analysis of the problem shows that the influence of surface diffusion on bulk viscosity at high strain rate can be decomposed as the sum of two terms: a term linked to the change in pore surface curvature and a term linked to the change in grain‐boundary size. The computational procedure relies on the partition of pore profile evolution into a transient component accounting for non‐densifying phenomena and an asymptotic component accounting for strain‐rate‐controlled phenomena. The largest impact of surface diffusion is found to arise from the change in grain‐boundary size. It follows a transition from Newtonian viscosity at low strain rate to non‐Newtonian viscosity which, during densification, increases nearly linearly with strain rate. In some conditions, viscosity can then reach more than twice the value estimated when neglecting pore surface diffusion. Reversely, expansion is accompanied by a decrease in grain‐boundary size which causes a decrease in viscosity and can lead to grain separation at high strain rate.