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Statut
Doctorant
Bureau
H3
Date d'arrivée

Presentation

My name is Pouya TAJDARY. I've working at PIMM laboratory on my PhD since october 2019. The title of my thesis is

"Numerical simulation of damage in nanostructure materials obtained by severe plastic deformation".

I mostly do simulation of damage in severe plastic deformation (SPD) and other forming processes (Deep drawing and Nakazima tests). For performing the simulations I implement material constetutive equations in FEM software ABAQUS using a user material (UMAT) code. I'm working on some extensions of Gurson's model. For example, I have implemeneted ML effect with void shape effects; also, I have used an extension of Gurson's model for prediction of stiffness drop in metal matrix composites. Right now, I'm working on developing an extension of Gurson model with microstructural effects that would be suitable for SPD processes.

Additionally, I work on validation of simulations using experimental data, namely X-ray diffraction method and other mechanical characterization methods for acquring hardness, geometry and macroscopic deformation.

 

Teaching Activity

Since the start of my PhD project, I've been giving practical courses in different programs. Namely,

  • Practical work session (TP) on Material Science course of ENSAM Engineering School program on fatigue

I given two different TPs. One is on dimentioning of a cylindric pressure vessel according to fatigue fracture and plasticity criterion and finding it's life cycle. The other one is on analysis of fatigue behavior in different conditions; such as: enhanced surface treatment by laser shot peening, ultrasonic fatigue test, etc. In this course students analyse and compare several fatigue test results based on different conditions and treatments and they also analyse the rupture surfaces by optical microscope.

  • CATIA course for Master 1 Factory of Future

I have taught Catia basics and Catia advanced courses to international students participating in this program. In Catia basics, design of volumetric parts and structures using part design, assembly and drafting modules of Catia was introduced. In advanced Catia course, the objective is creation of more sophisticated 3D shapes using Generative shape design.

 

Publications

My work during my PhD and before that in my internship has resulted in several publication in international journals:

  • Plancher, E., Tajdary, P., Auger, T. et al. Validity of Crystal Plasticity Models Near Grain Boundaries: Contribution of Elastic Strain Measurements at Micron Scale. JOM 71, 3543–3551 (2019). https://doi.org/10.1007/s11837-019-03711-5
  • Léo Morin, Chedly Braham, Pouya Tajdary, Raoudha Seddik, Gonzalo Gonzalez, Reconstruction of heterogeneous surface residual-stresses in metallic materials from X-ray diffraction measurements, Mechanics of Materials, Volume 158, 2021, 103882, ISSN 0167-6636, https://doi.org/10.1016/j.mechmat.2021.103882.
  • Tajdary, P., Morin, L., Braham, C. et al. A reduced single-pattern model for the numerical simulation of multi-pattern metal forming. Int J Mater Form 14, 1403–1416 (2021). https://doi.org/10.1007/s12289-021-01636-6
  • Pouya Tajdary, Léo Morin , Chedly Braham , Gonzalo Gonzalez, A deconvolution method for the mapping of residual stresses by X-ray diffraction, Experimental Mechanics, accepted
  • Pouya Tajdary, Léo Morin ,Liliana Romero-Resendiz, Maysam B. Gorji, Chedly Braham , Gonzalo Gonzalez, Analysis of shear ductile damage in forming processes using a micromechanical model with void shape effects, accepted

 

 

For more information, you can contact me using my email adress pouya.tajdary@ensam.eu or check out my linkedin profile.