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2025年巴黎高科 - CSC合作公派讀博項目 - 課題No.51
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2025年巴黎高科 - CSC合作公派讀博項目 - 課題No.51 2025 巴黎高科 - CSC公派博士項目 （12月8日截止） 網(wǎng)申通道：https://paristech.kosmopolead.com/phd 申請攻略：https://paristech.fr/fr/paristech-csc-phd-program-how-apply 課題51詳情: TITLE: ADVANCED DIALOGUE BETWEEN GRADIENT-ENHANCED PLASTICITY THEORIES AND SMALL-SCALE EXPERIMENTAL TESTS Topic number : 2024_051 Field : Material science, Mechanics and Fluids Subfield: Mechanics of materials ParisTech School: Arts et Métiers Research team : Méthodes Numériques, Instabilités et Vibrations (Numerical Methods, Instabilities and Vibrations) Research team website: Research lab: LEM3 - Laboratoire d'étude des microstructures et de mécanique des matériaux Lab location: Metz Lab website: https://lem3.univ-lorraine.fr Contact point for this topic: Mohamed JEBAHI, mohamed.jebahi@ensam.eu Advisor 1: Mohamed JEBAHI - mohamed.jebahi@ensam.eu Advisor 2: Advisor 3: Advisor 4: Short description of possible research topics for a PhD: With the growing trend towards miniaturization, micro-scale products have become increasingly employed in cutting-edge fields, such as microelectronics and microrobotics. However, as the geometrical size of these products decreases, intrinsic material parameters like grain size and the number of shallow grains remain constant. This leads to significant changes in the mechanical properties of materials. Conventional plasticity theories are unable to account for size effects due to their lack of intrinsic length scales. To address this limitations, gradient-enhanced plasticity approaches have emerged. In this context, the project team has recently developed advanced gradient-enhanced numerical models, which have demonstrated promising results, aligning closely with those derived from dislocation-based mechanics. However, the application of these models to real-world engineering problems still requires rigorous validation through advanced experimental tests. This project aims to bridge this gap by fostering an advanced dialogue between these numerical models and small-scale experiments. Based on this dialogue, further refinements to the gradient-enhanced models will be proposed, enabling their application to real-world small-scale engineering problems and helping to meet the rising demands of miniaturization-driven industries. The proposed work will make it possible to advance our ability to predict and control size-dependent mechanical behaviors, thus contributing to both scientific progress and technological innovation in miniaturized systems. Required background of the student: - Solid background in non-linear solid mechanics and finite element modeling. - Good analytical and programming skills (e.g., Python, Fortran, C++). - Excellent English level A list of (5 max.) representative publications of the group: (Related to the research topic) 1. Amouzou-Adoun, Y. A., Jebahi, M., Forest, S., & Fivel, M. (2024). Advanced modeling of higher-order kinematic hardening in strain gradient crystal plasticity based on discrete dislocation dynamics. Journal of the Mechanics and Physics of Solids, 193. 2. Amouzou-Adoun, Y. A., Jebahi, M., Fivel, M., Forest, S., Lecomte, J., Schuman, C., & Abed-Meraim, F. (2023). On elastic gaps in strain gradient plasticity: 3D discrete dislocation dynamics investigation. Acta Materialia, 252, 118920. 3. Jebahi M., & Forest S. (2023). An alternative way to describe thermodynamically-consistent higher-order dissipation within strain gradient plasticity. Journal of the Mechanics and Physics of Solids, 170, 105103. 4. Jebahi M., & Forest S. (2021). Scalar-based strain gradient plasticity theory to model size-dependent kinematic hardening effects. Continuum Mechanics and Thermodynamics, 33, 1223-1245. 5. Jebahi M., Cai L., & Abed-Meraim F. (2020). Strain gradient crystal plasticity model based on generalized non-quadratic defect energy and uncoupled dissipation. International Journal of Plasticity, 126, 102617. |
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