Issam Doghri
Recent publications

Research group(s): MEMA

PhD and Post-doc researchers under my supervision:

Contributions to nonlinear micromechanical modeling of composite and porous materials under small and large deformation
Marieme Imene El Ghezal

The goal of my research is to deliver models able to predict the effective mechanical behavior of materials made of at least two different phases and which can be used for complex loading tests like non-proportional loadings. The adopted technique is the Mean Field Homogenization (MFH). The development of such schemes strongly depends on the constitutive laws of the constituents. The range of materials concerned by this research is wide: elastic, viscoelastic, elasto-plastic (in the small strain regime) and hyperelastic-plastic in the finite strain regime. My research interests also include FE analysis of cellular materials, porous materials and composites involved mainly in the validation of the MFH schemes.

Finite strain modelling of polymers and continuous fiber reinforced composites
Muralidhar Reddy Gudimetla

The main thesis goal is to efficiently integrate the constitutive models of resin, fiber and fiber/matrix interface into a mulit-scale approach to predict the behavior of an uni-directional carbon-epoxy composite ply. This would require an efficient constitutive model for the resin/polymer which would address the experimentally observed features like strain-rate, temperature and pressure-dependency. So, an isotropic thermodynamically based fully coupled viscoelastic-viscoplastic model formulated under finite strain transformations was developed considering isothermal conditions, which is further extended to an anisotropic version suitable for structural composites. This model would be implemented in a multi-scale approach, with corresponding models for fiber and fiber/matrix interface, to predict softening/degradation in an uni-directional composite ply.

Recent publications

See complete list of publications

Journal Articles

1. Doghri, Issam; El Ghezal, Marieme Imene; Adam, Laurent. Finite strain mean-field homogenization of composite materials with hyperelastic-plastic constituents. In: International Journal of Plasticity, Vol. 81, p. 40-62 (june 2016). doi:10.1016/j.ijplas.2016.01.009.

2. Krairi, A.; Doghri, Issam; Robert, G. Multiscale high cycle fatigue models for neat and short fiber reinforced thermoplastic polymers. In: International Journal of Fatigue, Vol. 92, p. 179-192 (2016). doi:10.1016/j.ijfatigue.2016.06.029.

3. Wu, L.; Doghri, Issam; Noels, L. An incremental-secant mean-field homogenization method with second statistical moments for elasto-plastic composite materials. In: Philosophical Magazine, Vol. 95, no.28-30, p. 3348-3384 (2015). doi:10.1080/14786435.2015.1087653 (Soumis).

4. Wu, L.; Sket, F.; Molina-Aldareguia, J.M.; Makradi, A.; Adam, L.; Doghri, Issam; Noels, L. A study of composite laminates failure using an anisotropic gradient-enhanced damage mean-field homogenization model. In: Composite Structures, Vol. 126, p. 246-264 (2015). doi:10.1016/j.compstruct.2015.02.070.

5. Kammoun, Slim; Doghri, Issam; Brassart, Laurence; Delannay, Laurent. Micromechanical modeling of the progressive failure in short glass–fiber reinforced thermoplastics – First Pseudo-Grain Damage model. In: Composites Part A: Applied Science and Manufacturing, Vol. 73, p. 166-175 (2015). doi:10.1016/j.compositesa.2015.02.017.

6. Selmi, Abdellatif; Hassis, Hedi; Doghri, Issam; Zenzri, Hatem. A Cosserat-type plate theory and its application to carbon nanotube microstructure. In: American Journal of Applied Sciences, Vol. 11, no. 8, p. 1255-1273 (2014). doi:10.3844/ajassp.2014.1255.1273.

7. Miled, B.; Doghri, Issam; Brassart, Laurence; Delannay, Laurent. Micromechanical modeling of coupled viscoelastic–viscoplastic composites based on an incrementally affine formulation. In: International Journal of Solids and Structures, Vol. 50, no. 10, p. 1755-1769 (2013). doi:10.1016/j.ijsolstr.2013.02.004.

8. Maalej, Yamen; El Ghezal, Marieme Imene; Doghri, Issam. Micromechanical approach for the behaviour of open cell foams. In: European Journal of Computational Mechanics, Vol. 22, no.2-4, p. 198-208 (2013). doi:10.1080/17797179.2013.820979.

9. Brassart, Laurence; Doghri, Issam; Delannay, Laurent; Stainier, Laurent. Homogenization of elasto-(visco) plastic composites based on an incremental variational principle. In: International Journal of Plasticity, Vol. 36, p. 86-112 (sepembre 2012). doi:10.1016/j.ijplas.2012.03.010.

10. Miled, Bilel; Doghri, Issam; Delannay, Laurent. Coupled viscoelastic–viscoplastic modeling of homogeneous and isotropic polymers: Numerical algorithm and analytical solutions. In: Computer Methods in Applied Mechanics and Engineering, Vol. 200, no. 47-48, p. 3381-3394 (November 2011). doi:10.1016/j.cma.2011.08.015.

Conference Papers

1. Kammoun, Slim; Brassart, Laurence; Robert, G.; Doghri, Issam; Delannay, Laurent. Micromechanical modeling of short glass-fiber reinforced thermoplastics-Isotropic damage of pseudograins. In: AIP Conference Proceedings. Vol. 1353, p. 972-977 (2011). doi:10.1063/1.3590697.

2. André, Simon; Melchior, Maxime; Morelle, Xavier; Dumont, D.; Destoop, Vincent; Doneux, Catherine; Delannay, Laurent; Doghri, Issam; Daoust, Daniel; Bailly, Christian; Pardoen, Thomas. Local approach of fracture of HexFlow®RTM6 structural epoxy with thermoplastic and nanofillers additions. In: CD-Rom, Elesevier, 2011, p. réf. 123.

3. Adam, L.; Delaere, K.; Kaszacs, M.; Ge rard, J.-S.; Assaker, R.; Doghri, Issam. Multi-scale modeling of polymer nanocomposites. In: Nanotechnology 2009: Life Sciences, Medicine, Diagnostics, Bio Materials and Composites 2009. NSTI Nanotechnology Conference and Expo, Nano science and technology institute, 2009, 978-1-4398-1783-4, p. 515-518.

4. Brassart, Laurence; Doghri, Issam; Delannay, Laurent. Self-consistent modeling of DP steel incorporating short range interactions. In: International Journal of Material Forming. Vol. 2, no. 0, p. 447-450.

5. Ouaar, Amine; Doghri, Issam; Delannay, Laurent; Thimus, Jean-François. Micromechanics of the deformation and damage of steel fiber-reinforced concrete. In: International Journal of Damage Mechanics. Vol. 16, no. 2, p. 227-260 (2007). Sage Publications Ltd: London, 2007. doi:10.1177/1056789506064946.

6. Ouaar, Amine; Doghri, Issam; Thimus, Jean-François; Chevaugeon, Nicolas. Micromechanical modeling of steel fiber-reinforced concrete.

7. Ouaar, Amine; Thimus, Jean-François; Doghri, Issam; Remacle, Jean-François. Concrete-matrix composites : some micromechanical modeling aspects and numerical simulations.

8. Delannay, Laurent; Doghri, Issam; Lani, Frédéric; Van Rompaey, T.; Jacques, Pascal; Pardoen, Thomas. Multiscale constitutive model for the simulation of forming operations on TRIP-assisted multiphase steel. In: Proceedings of the 7th Esaform Conference Material Forming, 2004, p. 127-130.

9. Marchal, Yves; Schmidt, Konstantin; Pardoen, Thomas; Knockaert, Robert; Doghri, Issam; Delannay, Francis. Comparison of methods for the measurement of the fracture toughness of thin steel sheets. In: Mechanisms and Mechanics of Damage and Failure, EMAS: West Midlands U.K. 1996, p. 2259-2264.

10. Pardoen, Thomas; MORHET, JEROME; Delatte, Pierre; Doghri, Issam; Knockaert, Robert; Chaouadi, Rachid; Delannay, Francis. Comparison of local approach models and associated fracture criteria applied to notched round copper bars. In: Mechanisms and mechanics of damage and failure, EMAS: West Midlands U.K. 1996, p. 817-823.