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Keywords

Plasticity; Constitutive Modeling; Parameter Identification; Inverser analysis; Optimization; Ductile Fracture; Experimental and Numerical Methods; Formability; Friction Stir Welding; Plastic Forming of Metal sheets and tube; Robust Design; Artificial Neural Network (ANN).

Keys

Education

HDR

• 2015, HDR degree “Habilitation à Diriger la Recherche” (agregação), Academic Habilitation Degree, in Mechanical Engineering, approved with honor and distinction, defended on 5/6/2015 and delivered by University of Sousse-Tunisia. Title of HDR: Interaction Model / Experience and Parametric Identification Strategies Applied to Sheet metal forming and Tube hydroforming processes.

Abstract of HDR:

The research work in the HDR aimed to develop strategies for inverse parameter identification of constitutive laws, in order to better understand the interaction between experimentation and computation. To achieve this goal, mechanical tests and numerical simulations were conducted, combining experimental data and numerical simulations with non-quadratic behavior models such as the Barlat'91 and the Cazacu-Barlat 2001 yield criteria, to accurately replicate experimental measurements. Highly complex mechanical tests were performed to characterize the mechanical properties of materials used in metal forming processes, using specially designed and manufactured experimental setups. Additionally, a new identification strategy was developed, based on the use of experimental data combined with meaningful artificial data, to reduce costs associated with the identification of advanced behavior models, such as the Cazacu-Barlat 2001 yield criterion (18 anisotropy parameters). Finally, validating the results of numerical simulations against experimental data obtained leads to the conclusion about the potential use of advanced behavior yield criteria such as CB2001, Yld2004, etc., in an industrial context.

PhD

• 2004, PhD qualification in Mechanics of Materials, approved with honor and distinction, defended on 14 February 2004 and delivered by University of Tunis El-Manar II,
• (Reconhecimento de Grau e Doutoramento Estrangeiro Específico em Engenharia Mecânica da Universidade de Coimbra, registado com o n° 320190011442, em 18 de outoubro de 2019) “O júri de reconhecimento de grau atribuir a classificação de APROVADO COM DISTINÇÃO.

Title of PhD thesis: Identification des lois de comportement élastoplastiques par essais inhomogenes et simulation numériques, 12 citations of the thesis in Scholar Google.

Doi: https://dx.doi.org/10.13140/RG.2.2.32837.65769 

Abstract of PhD:

The work focuses on the use of an inverse parametric identification strategy to calibrate elastoplastic models using both homogeneous and inhomogeneous mechanical tests. Plasticity criteria are fundamental for the description of materials' behaviors, and the orthotropic quadratic Hill criterion is considered as the cornerstone for the development of anisotropic plasticity theory. Thereafter, more complex criteria have been proposed to better account for the anisotropy and hardening of different materials used in sheet metal forming process. The identified models are assumed to follow the transverse isotropic, Hill'48 orthotropic, and non-quadratic Barlat Yld'96 criteria, using the assumption of isotropic hardening and the formulation of elastoplastic behavior laws with associated and non-associated plastic flow rules. As a Final chapter of this dissertation, a novel method for sensitivity analysis has been developed to evaluate the impact of input parameters variation on the response of materials' models.

Download PDF using this link: https://theses.hal.science/tel-04345710

Master

• 1997, Master Degree “Diplôme d’Etudes Approndies” (with thesis dissertation) in Applied Mechanics of Materials, delivered by University of Tunis El-Manar II,

Title of Master thesis: Corrélation entre l’évolution de la microstructure et le comportement macroscopique d’une tôle d’emboutissage en acier inoxydable AISI304.

Abstract of the Master:

The objective of this study is to establish correlations between the evolution of microstructure (using optical metallography, SEM, XRD techniques) and the phenomenological behavior (using tensile tests and Forming Limit Diagrams (FLD)) of an austenitic stainless steel X6CrNi10-09 (AISI304). This stainless steel, commonly used in stamping, exhibits a metastable behavior that induces phase transformation by plastic deformation at room temperature, resulting in an evolving instantaneous strain hardening coefficient and high ductility. In this study, the volume fraction of the martensitic phase ( α' ferromagnetic) induced by plastic deformation was determined until fracture (saturation). We designed a sample magnetization setup to measure magnetic permeability at various equivalent plastic strains and in relation to the volume fraction of the α' martensitic phase. Finally, the developed setup was calibrated, enabling the indirect determination of the volume fraction of the α' martensitic phase dependent on the equivalent plastic strain value.

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