Naoufel BEN SALEM

En résumé

Entreprises

• P3 Voith Aerospace - Ingénieur Méthodes Composites

  Toulouse 2015 - maintenant Responsable de l'activité "matériaux composites" du P3 Group Nantes.
  Coordination des activités de développement et d'industrialisation sur le périmètre composite, qualification de pièces composites pour l'A380, A350, A320NEO, au sein du service OMCNM d'Airbus Nantes.

• Institut de Mécanique et d'Ingénierie – Bordeaux - Post-Doctorate, Research and Development (composite materials)

  2012 - 2014 STUDY THE MECHANICAL BEHAVIOUR OF FILAMENT-WOUND COMPOSITE VESSELS
  The use of cylindrical composite structures is continually increasing, causing the need for accurate and precise test methods to determine their properties. My research is done at Bordeaux Institute for Mechanics and Engineering with the industrial partnership EADS Composites Aquitaine. The main objective is to study the mechanical behaviour of filament-wound composite vessels. For that, I develop a new test fixture to test composite rings under internal pressure. The advantages of this new experimental device compared to existing solution are: easy to set up, inexpensive, adapted for universal tensile machine, and can generate a high level and uniform internal pressure to characterise high strength composite rings.

• Centre national d'études spatiales - PhD Thesis

  Toulouse 2009 - 2012 RELIABILITY OF BONDED ASSEMBLIES FOR SPACE LAUNCHERS
  Adhesive bonding is being strongly considered in the space applications CNES as an advantageous assembly technique for future launchers. Correct design of the adhesive joints in the future Ariane 6 launcher is of major concern. Aerospace adhesives are very tough viscoelastic matrices (special epoxy resins) reinforced with nano-, or microparticles. Extended use of the adhesive joints in structural applications is limited due to the difficulties in predicting of the in-service performance viz. reliability, frequently leading to over-conservative design.
  Three structural adhesives (Hysol® EA 9321™ Hysol® EA 9394™ and Hysol® EA 9395™) were selected. The first part of my studies was to characterize crosslinking condition. For that dynamic mechanical analysis (DMA) was used. The sensitivity of mechanical properties, of the bulk adhesive, to the manufacturing and test conditions were analyzed and followed by a statistical studies to highlight effects of different parameters e.g. speed, test piece geometry, degree of polymerization. In the second stage I have performed fracture mechanics tests employing: the double cantilever beam (DCB) configuration, mode I characterization, the three point bending end-notched flexure (ENF), mode II, and the mixed-mode bending (MMB), combined mode I/II loading.
  Crack growth in an bonded joint was investigated in a novel way. To refine standard test protocol, where applied force and load line displacements are measured and analysed, backface strain monitoring technique was used. Strain gauges are used to measure the strain on the exposed skin of the adherends during crack onset and propagation. This method allows better estimation of the crack front position as well as fine investigation of the stress distribution along the bondline and in the crack front vicinity. Digital image correlation (DIC) was also used to compare analytical models, e.g. a Timoshenko beam on elastic foundation model with experimental results.

• Ecole des Mines d'Albi Carmaux - Internship: Research and Development

  ALBI CT 09 2009 - 2009 STUDY OF THE MECHANICAL BEHAVIOR OF COMPOSITE WITH KNITTED REINFORCEMENT ELABORATED BY LRI
  Supervisors: Prof. Gérard BERNHART, Dr. Gilles DUSSERRE – EMAC-CROMeP.
  Knitted reinforcements for composite materials are of great interest due to their high drapability and easiness of production process automation. However, their use is still limited because of their poor mechanical properties. In order to minimize this drawback, I have investigated the influence of the textile preform on the final behavior of the composite. Liquid Resin Infusion (LRI) process was used to produce the composites with different fiber form (plain or 1×1 rib), material (carbon, basalt and glass) and orientation but keeping composite matrix the same. Tensile tests were performed on prepared composites and Digital Image Correlation was used to highlight the deformation heterogeneity due to knitted reinforcement. Difference in behavior depending on fiber material and fiber orientation was explained.

Formations

Réseau

• Ahmed FEHRI

• Cédric BELLOT

• Jean-José ORTEU

• Jean-Michel LEBEC

• Mohieddine BOUBTANE

• Romain MORLON

• Sami SGAHIER

• Sébastien CHAUFFAILLE

• Taoufik ISSAOUI

• Titouhi AYOUB