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Hearinglee

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[交流] PhD Grants： Co-operation Program with the UTs and INSAs (France), Program 2020

大家好，

法国一导师招收一名2020年CSC的学生，是通过留学基金委与法国UT-INSA集团合作的项目，该项目每年11,12月份就截止了，而且一般来年的2,3月份就能知道结果，不需要雅思成绩，通过1月份左右在北京的面试后需要在上海进行为期三四个月的法语培训。具体关于这个项目的信息可以在留学基金委网站上找到。

课题信息如下，可以直接联系老师，如果想了解其他的事情也可以先私信我。

课题信息：

Thesis subject:
Development, characterization and modelling of bulk Al alloys materials with improved
mechanical properties conferred by high strain rate self-consolidation.

Keywords:
Al alloys, high strain rate, structure, properties, modelling, constitutive law

Description:
Technological context and current issues:
High speed impact welding is a new innovative joining process capable of combining various metals. The high strain rate collision generated by the impact process between the two parts to weld involves complex kinematics and non-equilibrium transformations that create a welded joint while conferring also a gradient of structure and increased mechanical properties across the welded interface, whose formation and occurrence were depicted through computational analysis of the dynamic collision process at the interface combined with various structural characterization [1,2]. A confinement of high strain rate at the interface during the high-speed collision has been identified as major phenomenon that governs those interfacial structural changes and mechanical properties improvement [3]. A few cases of aluminum alloys were investigated and resulted in this property gradient finding with the metallurgical transformations the thermally affected zones produce. One of our current objectives is to take advantage of these results to develop bulk aluminum material with improved properties based on these high strain rate phenomena. Today, such
aluminum material is of high interest since they can contribute for a further lightweighting for several application such as for aircraft design, vehicle reinforcement or similar performances. The bulk materials will be manufactured by a solid-state additive method that also uses a high strain rate collision with impact velocity range similar to that of highspeed impact welding. By a continuous ballistic collision of micron powders, the cold spray process enables for creating, layer by layer, a self-consolidated bulk component [4].

Research works:
This PhD work focuses on the development, characterization and modelling of bulk Al alloys materials with improved mechanical properties conferred by high strain rate selfconsolidation. The candidate will develop knowledges about the metallurgical transformations generated by the process, and their intrinsic features including the properties they create. For that purpose, various structural analysis will be performed to characterize the material using fine analysis (SEM, EBSD, TEM, nano-identation). The intrinsic properties of the high strain rate induced structure will be correlated to macroscopic mechanical behaviors of the material characterized by mechanical testing. Thus, predictive elastic-plastic bulk behavior coupled with damage evolution will be developed from micro-structural features of the material, using a micromechanical modelling approach [5,6]. Then, the predictive model will be used to depict the suitable structures for optimum properties, and thereby to develop optimized bulk component based on the suitable selection of cold spray conditions including the powder features and the process setting. The numerical modelling will be performed using Matlab and Abaqus 6.14 packages.

Expected background of the PhD candidate:
Computational material science, Mechanics of materials, Finite element method, Structural characterization, Metallurgy of aluminum alloy

Supervision of the research works and collaboration:
Supervisor: M. Rachik 1
Co-supervisor: R.N. Raoelison 2
Collaboration: T. Sapanathan 3
1 Sorbonne universités, Université de technologie de Compiègne, Laboratoire Roberval, FRE 2012 CNRS-UTC, Centre de recherche Royallieu, Compiègne, France
2 Université de Bourgogne Franche-Comté - UTBM, Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS, 90100 Belfort, France
3 Institute of Mechanics, Materials and Civil Engineering, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium

Contact :
Mohamed Rachik : Maître de Conférences HDR, mohamed.rachik@utc.fr

References
[1] T. Sapanathan, R.N. Raoelison, E. Padayodi, N. Buiron, M. Rachik, Depiction of interfacial characteristic changes during impact welding using computational methods: Comparison between Arbitrary Lagrangian - Eulerian and Eulerian simulations, Materials & Design. 102 (2016) 303–
312. doi:10.1016/j.matdes.2016.04.025.
[2] R.N. Raoelison, D. Racine, Z. Zhang, N. Buiron, D. Marceau, M. Rachik, Magnetic pulse welding: Interface of Al/Cu joint and investigation of inter metallic formation effect on the weld features, Journal of Manufacturing Processes. 16 (2014) 427–434.
doi:10.1016/j.jmapro.2014.05.002.
[3] R.N. Raoelison, T. Sapanathan, E. Padayodi, N. Buiron, M. Rachik, Interfacial kinematics and governing mechanisms under the influence of high strain rate impact conditions: Numerical computations of experimental observations, Journal of the Mechanics and Physics of Solids. 96
(2016) 147–161. doi:10.1016/j.jmps.2016.07.014.
[4] R.N. Raoelison, C. Verdy, H. Liao, Cold gas dynamic spray additive manufacturing today: Deposit possibilities, technological solutions and viable applications, Materials & Design. 133 (2017) 266–287. doi:10.1016/j.matdes.2017.07.067.
[5] Y. Hou, T. Sapanathan, A. Dumon, P. Culière, M. Rachik, A novel artificial dual-phase microstructure generator based on topology optimization, Computational Materials Science. 123 (2016) 188–200. doi:10.1016/j.commatsci.2016.06.020.
[6] Y. Hou, S. Cai, T. Sapanathan, A. Dumon, M. Rachik, Micromechanical modeling of the effect of phase distribution topology on the plastic behavior of dual-phase steels, Computational Materials Science. 158 (2019) 243–254. doi:10.1016/j.commatsci.2018.11.025.

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