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July, 11th - New article online in JNM: new insights about UO2 crystal plasticity

posted Jul 11, 2018, 1:06 AM by Jonathan Amodeo   [ updated Jul 11, 2018, 1:43 AM ]

Luc Portelette, Jonathan Amodeo, Ronan Madec, Julian Soulacroix, Thomas Helfer, and Bruno Michel "Crystal viscoplastic modeling of UO2 single crystal" published in Journal of Nuclear Materials is now online. It can be download here. Here is the abstract. Please contact me for any further information (jonathan.amodeo@insa-lyon.fr). Congrats Luc!


Fig. Modeling of the stress anisotropy in UO2 single crystal using CPFEM
Abstract: 
The viscoplastic behavior of uranium dioxide (UO2) single crystal is of great interest to perform predictive multiscale modeling of the nuclear fuel. Here, a viscoplastic model is built considering dislocation glide in ½<110>{100} and ½<110>{110} slip systems. The constitutive law parameters are determined adjusting the temperature dependency of the experimental critical resolved shear stress for both principal slip modes. Crystal plasticity finite element simulations of single crystal compression tests show a reasonable agreement with experimental viscoplastic anisotropy of UO2. However, for specific orientations where ½<110>{111} slip is observed experimentally, significant differences remain between experimental and computed compression stresses. Therefore, the role of ½<110>{111} slip is investigated based on a parametric study that provides new insights on UO2 plastic deformation. Several parameterizations of ½<110>{111} slip are tested highlighting the complexity of UO2 viscoplastic behavior. Significant improvements are still required to explain all simulation-experiment gaps.

June, 20th - @EMRS Spring, Strasbourg (France)

posted Jun 20, 2018, 8:45 AM by Jonathan Amodeo

I will give a talk about the influence of NP amorphous shell on their mechanical properties tomorrow morning (symposium AA Strength, plasticity, fracture and fatigue behaviour controlled by interfaces and grain boundaries) and present a poster about dislocation nucleation in MgO using NEB tomorrow evening.

June, 5th - New article online !

posted Jun 5, 2018, 12:23 AM by Jonathan Amodeo   [ updated Jun 5, 2018, 12:24 AM ]

The study "Dislocations and Plastic Deformation in MgO Crystals: A Review" has recently been published in the Special Issue Crystal Dislocations: Their Impact on Physical Properties of Crystals of the crystals magazine. 

Please find the article here


21st Mar, 2018 - Welcome Javier Gonzalez !

posted Mar 21, 2018, 9:55 AM by Jonathan Amodeo

Javier just joined our group for his M2 internship about modeling dislocation vs rough surface interactions using MD. Welcome !

27 Feb, 2018 - PhD thesis on UO2 multi-scale modeling starting end of 2018

posted Feb 27, 2018, 9:30 AM by Jonathan Amodeo

http://mateis.insa-lyon.fr/sites/mateis.insa-lyon.fr/files/resume_these_thot_18-0052_eng.pdf

13 Feb, 2018 - Lab' seminar @SRMA CEA Saclay, Paris (March, 15th)

posted Feb 12, 2018, 11:31 PM by Jonathan Amodeo

I'll give a seminar entitled "Mechanics of nanoparticles: a perspective crossing simulations and experiments" at the SRMA CEA Saclay, next March 15th.

31 Jan, 2018 - Welcome Qinqin Xu

posted Jan 31, 2018, 5:46 AM by Jonathan Amodeo

Qinqin Xu starts his PhD (CSC program) a few months ago in our group. He will investigate the nanomechanics of alumina polymorphs using atomistic simulation.

16 Jan, 2018 - Lab' seminar about core-shell nanoparticles

posted Jan 15, 2018, 10:58 PM by Jonathan Amodeo

I'll give a seminar entitled "on the role of surface state on the mechanics of metallic nanoparticles: a molecular dynamics study" presenting the work of Alexandra Goryaeva at MATEIS.
The talk is today, 1PM at the Blaise Pascal building, INSA campus.

24 Nov, 2017 - MRS fall next week in Boston !

posted Nov 24, 2017, 10:18 AM by Jonathan Amodeo

I will be at MRS fall next week in Boston giving a talk monday afternoon (Symposium TC06: Mechanical Behavior at the Micro and Nanoscale—Bridging Between Computer Simulations and Experiments) about how edge/corner blunting influence dislocation nucleation in nanoparticles. In addition, I will present some recent results about dislocation nucleation in oxydes NPs during the first poster session. See you there ! ;)

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