Issue 52

A. Drai et alii, Frattura ed Integrità Strutturale, 52 (2020) 181-196; DOI: 10.3221/IGF-ESIS.52.15 181 Finite element modeling of the behavior of polymethyl-methacrylate (PMMA) during high pressure torsion process Ahmed Drai Mechanical Engineering Department, University of Mascara, 29000, LABAB Laboratory of ENPO, Algeria. draiahmed14@yahoo.fr, http://orcid.org/ 0000-0001-6091-9519 Benaoumeur Aour Laboratory of Applied Biomechanics And Biomaterials (LABAB), ENP Oran, BP1523 El Mnaour, Oran, 31000, Algeria. benaoumeur.aour@enp-oran.dz , http://orcid.org/0000-0002-2345-6790 Naima Belayachi Université d’Orléans, Laboratoire de Mécanique Gabriel Lamé Polytech Orléans, 45072 Orléans, France. naima.belayachi@univ-orleans.fr , http://orcid.org/0000-0002-2345-6791 Abderrahim Talha Ecole des Hautes Etudes d’Ingénieur (HEI), 13 rue de Toul, 59046 Lille, Lille Mechanics Unit, University of Lille, France abderrahim.talha@hei.fr, http://orcid.org/0000-0003-2345-6792 Noureddine Benseddiq Lille Mechanics Unit, University of Lille, France noureddine.benseddiq@univ-lille1.fr , http://orcid.org/0000-0003-2345-6793 A BSTRACT . High Pressure Torsion (HPT) is a highly effective super-plastic deformation process for obtaining nano-materials with high performance mechanical properties. In view of its optimization, it is of paramount importance to evaluate the relations between the behavior of the material under the effects of different processing parameters. In this context, this work aims to highlight the plastic strain distribution in the deformed material as a function of the hydrostatic pressure, the torsion angle and the temperature of the material applied during the process. A typical amorphous polymer (Polymethyl-Methacrylate: PMMA) has been tested. Firstly, in order to identify the material parameters of a phenomenological elasto-viscoplastic model compression tests at different temperatures and strain rates have been carried out. Then, the distributions of the effective plastic strain, the equivalent plastic strain rate and the hydrostatic stress were analyzed using finite elements method. Recommendations on process conditions were Citation: Drai, A., Aour, B., Belayachi, N., Talha, A., Benseddiq, N., Numerical modeling of polymethyl-methacrylate (PMMA)behavior during high pressure torsion process, Frattura ed Integrità Strutturale, 52 (2020) 181-196. Received: 20.12.2019 Accepted: 10.02.2020 Published: 01.04.2020 Copyright: © 2020 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.