Post-Doctoral Position : Thermal Behavior Of Thermoplastic Composite Preforms

Universities and Institutes of France
November 24, 2022
Contact:N/A
Offerd Salary:Negotiation
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Contract Type:Temporary
Working Time:Full time
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  • Organisation/Company: IMT Mines Albi
  • Research Field: Engineering
  • Researcher Profile: First Stage Researcher (R1)
  • Application Deadline: 24/11/2022 22:00 - Europe/Brussels
  • Location: France › albi
  • Type Of Contract: Temporary
  • Job Status: Full-time
  • Hours Per Week: 38
  • Offer Starting Date: 01/01/2023
  • JOB ENVIRONMENT

    A school of the ministry in charge of industry, IMT Mines Albi is a school of the Institut Mines-Télécom, the

    leading group of engineering and management schools in France. At the forefront of industrial and

    academic issues on the international scene, it acts as a territorial scientific and economic engine by

    combining its 4 missions in a virtuous circle that brings innovation and in particular research teams,

    distributed within its 3 centers, which work on the emergence and improvement of industrial processes, in

    particular on its 4 technological platforms.

    This position is open within IMT Mines Albi and is attached to the Institut Clément Ader Albi (ICAAlbi)

    centre. This centre is part of the Institut Clément Ader (ICA - UMR CNRS 5312), a laboratory whose

    five supervisory institutions are IMT Mines Albi, INSA Toulouse, ISAE-SUPAERO, Université Paul

    Sabatier and CNRS. ICA-Albi has about 75 people and carries out research in three of the ICA research

    groups: the MSC group (Composite Materials and Structures), the SUMO group (Surface, Machining,

    Materials, Tools) and the MICS group (Measurement, Identification, Control, Monitoring). ICA-Albi is in

    charge of the MIMAUSA research and innovation platform (Processing of aeronautical materials and

    active monitoring).

    The activities of ICA-Albi are mainly oriented towards problems of the aeronautics, space and energy

    industrial sectors. They particularly concern :

    • the study of new materials and processes, mainly in the fields of metals and composites but also

    in those of ceramics, polymers and multi-materials,

    • tools and moulds for shaping, based on multidisciplinary approaches (materials, mechanics, heat,

    environment, instrumentation),

    • the development of new metrological techniques based on non- or low- intrusive optical sensors,

    for experimental photo-thermo-mechanics and process and system monitoring.

    RESEARCH ACTIVITIES CONCERNED BY THE PROJECT

    The Tailored Fiber Placement (TFP) is a preparation technique for textile preforms that has been

    optimized by Nobrak for the production of composite parts. Such preforms are made of commingled yarns,

    combining reinforcing filaments (glass, carbon, linen...) with thermoplastic filaments (PP, PA6…), arranged

    in an optimal way according to the expected performances in the final part. These preforms are then

    consolidated under a pressure of several bars above the melting temperature of the thermoplastic matrix

    (T>200°C) to obtain a near net-shape thermoplastic composite part.

    The consolidation stage in a hot press is however a time consuming and expensive step when it is

    initiated from a preform at room temperature. The pre-heating of textile preforms in an oven is therefore

    considered by Nobrak in order to reduce the cycle time of composite parts' consolidation. Among the

    different possible heating technologies, infrared heating is the most efficient way to rapidly heat up the

    preforms and is already commonly used in thermoplastic composite manufacturing processes. The

    DEIMOS collaborative project thus aims to support Nobrak in the introduction of infrared heating

    technology in its textile preform consolidation process.

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    Controlling the temperature of a textile preform is challenging because the thermo-optical properties and

    heat diffusion within the preforms are strongly influenced by the commingled architecture and the porous

    microstructure. The research activities therefore consist in studying the heating of preforms made by TFP

    by characterizing and modeling the thermal and optical properties of these preforms.

    The equivalent thermal conductivity of TFP preforms will be a particular point of interest of the postdoctoral

    study. Indeed, conventional techniques such as hot disk are not applicable to textile preforms that

    are compressible and new strategies must be developed for the assessment of this thermal property.

    A specific bench is currently being developed for the determination of materials' thermal conductivity by

    inverse analysis. The work will consist in finalizing the set-up and in characterizing the properties of

    consolidated materials as well as porous textile preforms. The influence of commingled yarn composition

    (fiber and matrix), yarn orientation and stacking configuration will be investigated and their influence on

    the heating behavior will be analyzed.

    MISSIONS

    - Development of experimental protocols

    - Realization of experimental characterization programs

    - Development of numerical models and/or simulations

    - Writing of project deliverables and scientific communications

    - Participation in the management of the project

    - Supervision of trainees on activities related to the project

    Offer Requirements Skills/Qualifications

    At the starting date of the post-doc, the candidate should have obtained a PhD degree within the last 3

    years, in materials science, heat transfer or eventually in mechanical engineering. He/she must be familiar

    with composite materials and their processes and have an interest for experimental work as well as a

    basic knowledge of finite element simulation (Comsol Multiphysics).

    The candidate must be able to demonstrate autonomy and rigor to achieve the ambitious objectives of this

    project. Communication ability is also an important skill expected from the candidate due to the industrial

    context of the project

    Specific Requirements

    As the position is open in a restricted area (ZRR) of the ICA, the recruitment is subject to the opinion of

    the senior defence and security official of the Ministry of Economy and Finance. Access to the CEA site is

    also subject to a specific procedure

    Contact Information
  • Organisation/Company: IMT Mines Albi
  • Organisation Type: Higher Education Institute
  • Website: https: // www. imt.fr/
  • E-Mail: dri-dr@imt.fr
  • Country: France
  • City: paris
  • Postal Code: 81000
  • Street: campus jarlard
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