BLANC - Blanc

LIght Structure And Composite – LISTRAC

Submission summary

Cellular materials are used in a large number of applications like core material in sandwich structures or impact energy absorber in passive security systems for goods or persons. The first objective of the LISTRAC (LIght STRuctures And Composites) project is to explore new investigation ways for the development of cellular materials and the improvement of their performances. The research axis developed in this project cover domains from formulation and processing of polymeric foams taking into account fillers and inclusions, to identification of generated morphologies through mechanical characterizations and modelling. The project is ambitious and requires strong competences in various areas of expertise existing in research laboratories in Aquitaine. To each key point for the development of the LISTRAC project is associated a team from a research laboratory (LAMEFIP, CRPP, LCPO) or the technological transfer unit TOMOMAT from ICMCB. The project LISTRAC comprises two main stages: (1) Formulation / Processing and (2) Identification / Modelling. (1) Formulation / Processing Cellular materials will be elaborated at CRPP and LCPO in order to obtain foams of different calibrated morphologies from organic or hybrid organic / inorganic polymers and filled with carbon nanotubes. The cellular materials will be obtained by emulsion chemistry, supercritical CO2 injection or hollow spheres assembling. The following objective will be to study the potentialities of those processes for classical thermoplastic (polystyrene PS, polycarbonate PC), technical (PSU,..) or thermo hardening (epoxyde resins) polymers. In all cases, processing parameters will be optimized to get cellular materials of calibrated structure. A particular attention will be directed to structure reinforcement by the addition of carbon nanotubes. The final expected result of this step is the production of innovative foams having a controlled morphology (porosity and cell size values and distribution, connectivity). The structure of those cellular materials will be qualitatively identified using several techniques in order to correlate processing methods and morphologies. In complement to classical imaging techniques (SEM, TEM), different quantitative 3D imaging tools will be employed: micro focus or synchrotron micro tomographs and focused ion beam (FIB) apparatus. Those apparatuses produce data permitting to reconstruct 3D images of porous material micro geometry giving access to new morphological information. This part of the project will be operated by TOMOMAT, the technological transfer unit of ICMCB. 2/ Identification / Modelling. The second stage consists in modelling of the produced foams. A preliminary experimental phase of mechanical characterization will complement an existing data base (LAMEFIP expertise). Cellular material behaviour will be studied as a function of the different processing parameters (nature of the dense material, concentration of carbon nanotubes, density, microstructure) and for a large range of strain rate (the targeted application is passive security). The imaging by micro tomography of the cellular material microstructure before and at the different steps of dynamic loading will give access to the local strain field. Those results (local and macroscopic) will be used to validate the developed relations for mechanical behaviour of the studied cellular materials. The ultimate work in this stage will be modelling of the produced cellular materials using the identified morphological parameters at the microscopic scale or at the mesoscopic scale or, eventually, at both scales. To reproduce the macroscopic mechanical behaviour of the considered foams, tailored numerical tools will be built based on FE, DEM or both combined. The final result of the project LISTRAC will include the production of innovative foams and the definition of multi scale numerical models permitting the prediction of their mechanical behaviour as a function of their morphology. Then it will be possible to correlate foam mechanical behaviour, microstructure and parameters of the production process.

Project coordination

Philippe VIOT (Autre établissement d’enseignement supérieur)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


Help of the ANR 480,000 euros
Beginning and duration of the scientific project: - 48 Months

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