NAIT-ALI Azdine

Maître de Conférences HDR
azdine.nait-ali@ensma.fr

CNRS-Université de Poitiers-ISAE ENSMA

Téléport 2 – 1 avenue Clément Ader

BP 40109 – 86961 Futuroscope Chasseneuil Cedex

Equipe de recherche

Endommagement

Physique et Mécanique des Matériaux

Recherche


Mes travaux de recherches sont essentiellement axés sur :

  • La construction d’un matériau numérique virtuel, « morphologiquement équivalent » au matériau réel étudié. Les données statistiques requises à cet effet seront fournies grâce à une caractérisation morphologique préalable du matériau réel à partir d’outils d’analyse morphologique adaptés. Cette analyse morphologique permettra également de choisir un Volume Élémentaire Représentatif (VER).

Macro-Zone effect

 

  • Développement d’un code FFT en élasticité cristalline, EVP, viscoélasticité, etc…

Plastic strain Titanium

  • Une modélisation non-locale en vue de mieux comprendre et/ou reproduire les effets de gradients de microstructure (c’est-à-dire liés à la répartition aléatoire des défauts, l’existence de clusters, etc….) sur la résistance du matériau ou son comportement au sens large. Pour cela on construitun modèle à gradient (enrichi) par transition d’échelle (méthode variationnelle, Asymptotique)

Non-local modeling: macroscopic behavior of a randomly voided material and influence of void morphology on the elastic properties gradient

 

  • Les méthodes de transition d’échelle plus particulierement les méthodes variationnelles et Asymptotiques.

 

Enseignement


Département MSISI.

Responsable du module de Calcul Scientifique et  y enseignant les cours suivant :

  • Mathématique pour la mécanique.
  • Optimisation.
  • Projet Calcul Scientifique (homogénéisation)

Activités administratives


Membre de CES (Commission des Experts Scientifiques) de l’ENSMA – section 60 CNU

Membre du CA (Conseil d’administration) de l’ENSMA 

Sélection de publications


Liste de Publications: 

  1. Sazerat, M. et al. (2023) ‘High temperature microstructure stability of Waspaloy produced by Wire Arc Additive Manufacturing’, Journal of Alloys and Compounds, 966, p. 171626. 
  2. Sazerat, M. et al. (2023). Microstructural and Tensile Properties Evolutions of Direct-Aged Waspaloy Produced by Wire Arc Additive Manufacturing. In: Ott, E.A., et al. Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham.
  3. Stinville, C. C. et al. (2023) ‘Microstructural statistics for low-cycle fatigue crack initiation in α+β titanium alloys: a microstructure based RVE assessment Microstructural statistics for low-cycle fatigue crack initiation in α+β titanium alloys: a microstructure b’, International Journal of Fatigue, 176, p. 107854.
  4. Ono, H., Nait-Ali, A. and Castagnet, S. (2023) ‘Damage evolution in unfilled EPDM during various types of repeated hydrogen high-pressure cycles’, International Journal of Fracture. Springer, 242(2), pp. 153–167
  5. N’Tsouaglo, K. H. et al. (2022) ‘Time-Resolved Evolution of the 3D Nanoporous Structure of Sintered Ag by X-Ray Nanotomography: Role of the Interface with a Copper Substrate’, Advanced Engineering Materials, 24(1), p. 2100583.
  6. Yvinec, T. et al. (2022) ‘Tensile properties of Ti-6Al-4V as-built by laser metal deposition: The relationship between heat affected zone bands, strain localization and anisotropy in ductility’, Additive Manufacturing, 55, p. 102830
  7. Huet, A. et al. (2022) ‘Journal Pre-proof Onset of plastic deformation and strain localization in relation to β phase in metastable β and dual phase Ti alloys’, Acta Materialia. Pergamon, 240, p. 118348.
  8. Nait-Ali, A., Hémery, S. and Gueguen, M. (2021) ‘How macrozone size and morphology influence yield in titanium alloys inves-tigated using fast Fourier transform-based crystal plasticity simulations How macrozone size and morphology influence yield in titanium alloys investigated using’, International Journal of Solids and Structures.
  9. Elhaj Salah, S. Ben et al. (2020) ‘Non-local modeling with asymptotic expansion homogenization of random materials’, Mechanics of Materials. Elsevier, 147, p. 103459.
  10. Local kinetics of cavitation in hydrogen-exposed EPDM using in-situ X-Ray tomography: Focus on free surface effect and cavity interaction
  11. Castagnet, S., Nait-Ali, A. and Ono, H. (2019) ‘Effect of pressure cycling on decompression failure in EPDM exposed to hight-pressure hydrogen’, in Constitutive models for rubber XI. CRC Press/Balkema, pp. 168–173.
  12. Hémery, S. et al. (2019) ‘A 3D analysis of the onset of slip activity in relation to the degree of micro-texture in Ti-6Al-4V’, Acta Materialia, 181, pp. 36–48
  13. Milhet, X. et al. (2018) ‘Evolution of the nanoporous microstructure of sintered Ag at high temperature using in-situ X-ray nanotomography’, Acta Materialia, 156.
  14. Hémery, S. et al. (2018) ‘Mechanical study of crystalline orientation distribution in Ti-6Al-4V: An assessment of micro-texture induced load partitioning’, Materials and Design, 137(137), pp. 22–32
  15. Ono, H. et al. (2018) ‘Influence of pressure cycling on damage evolution in an unfilled EPDM exposed to high-pressure hydrogen’, International Journal of Fracture, 210
  16. Castagnet, S. et al. (2018) ‘In-situ X-ray computed tomography of decompression failure in a rubber exposed to high-pressure gas’.
  17. Nait-Ali, A. (2018) ‘Stochastic homogenization of reinforced polymer with very small carbon inclusions’, R. Mecanique, 346, pp. 1192–1198. doi: 10.1016/j.crme.2018.09.002.
  18. Nait-Ali, A. (2017) ‘Nonlocal modeling of a randomly distributed and aligned long-fiber composite material’, C.R. Mecanique, 345, pp. 192–207. doi: 10.1016/j.crme.2016.11.004.
  19. Hémery, S., Nait-Ali, A. and Villechaise, P. (2017) ‘Combination of in-situ SEM tensile test and FFT-based crystal elasticity simulations of Ti-6Al-4V for an improved description of the onset of plastic slip’, Mechanics of Materials, 109, pp. 1–10.
  20. Kane-Diallo, O. et al. (2016) ‘Time-resolved statistics of cavity fields nucleated in a gas-exposed rubber under variable decompression conditions – Support to a relevant modeling framework’, Polymer Testing.
  21. Nait-Ali, A., Ousseynou, K.-D. and Castagnet, S. (2015) ‘Catching the time evolution of microstructure morphology from dynamic covariograms Évolution temporelle de la morphologie de la microstructure à partir d’un covariogramme dynamiques’, R. Mecanique, 343, pp. 301–306
  22. Kane Diallo, S. Castagnet, J.C. Grandidier, A. Nait-Ali (2015) ‘Morphology of damage occurring during decompression in a hydrogen- exposed EPDM’, Constitutive Models for Rubber IX, 345.
  23. Nait-Ali, A. (2014) ‘Volumic method for the variational sum of a 2D discrete model Méthode volumique pour la sommation variationnelle d’un modèle 2D discret’, R. Mecanique, 342, pp. 726–731.
  24. Michaille, G., Nait-Ali, A. and Pagano, S. (2012) ‘Two dimensional deterministic model of a thin body with randomly distributed high conductivity fibers’, Applied Mathematics Research eXpress, 1, pp. 122–156
  25. Michaille, G. G., Nait-Ali, A. and Pagano, S. S. (2011) ‘Macroscopic behavior of a randomly fibered medium’, Journal de mathématiques pures et appliquées, 96, pp. 230–252.
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