ORGANISATION/COMPANYArts et Métiers Institute of Technology
RESEARCH FIELDEngineering › Process engineeringTechnology › Materials technology
RESEARCHER PROFILEFirst Stage Researcher (R1)Recognised Researcher (R2)Established Researcher (R3)Leading Researcher (R4)
APPLICATION DEADLINE30/11/2019 00:00 - Europe/Athens
LOCATIONFrance › CHALONS EN CHAMPAGNE
TYPE OF CONTRACTTemporary
OFFER STARTING DATE06/01/2020
Natural fiber reinforced polymer (NFRP) composites present the new generation of the bio-based products that interest industrials. These eco-friendly materials are carried out by assembling natural fibers and polymer matrices. If the matrix is also bio-based, the composite is then called a bio-composite or a green composite. The use of natural fibers, typically plant fibers, as reinforcement of composite materials has becoming increasingly common in many industrial sectors as a substitute for synthetic glass fibers. This is due to the different technical, economic and environmental advantages that plant fibers offer in different industrial applications in order to reduce the environmental impact and thus contribute to the development of a circular and sustainable economy. This is why a particular interest is brought to the manufacturing processes of these innovative materials, typically machining. The latter presents scientific and technical issues to address, in particular because of the complex cellulosic structure of the plant fibers which makes them significantly sensitive to the small variations of the machining parameters. This results in a strong anisotropy of the thermomechanical behavior of plant fibers which limits the effectiveness of their shearing during cutting with conventional machining.
This PhD project, in partnership between the MSMP laboratory of ENSAM engineering school and the Research Center of Innovation and Technology Transfer in Fluid Jet and Machining Techniques (CRITT - TJFU), is dealing with the cryogenic machining of NFRP composites. This machining technique seems to be promising for synthetic composites. However, the application to NFRP materials is not yet developed. Indeed, despite the fact that machining at low temperatures is useful for improving the shearing of plant fibers by stiffening the fibers and the matrix, such a treatment could introduce cryogenic fluid molecules in the plant fibers because of their hydrophilic nature. Consequently, the effects of these cryogenic fluids on the mechanical, tribological and thermal behavior of plant fibers are unknown. Therefore, the cryogenic machining of NFRP composites requires a scientific study to perform a deep modeling of this process and thus validate its development for integration into the industrial production chain of NFRP composites.
The PhD student will conduct a hygrometric characterization of plant fibers under atmospheric and cryogenic conditions and then analyze the effect of each environment on the thermomechanical properties of plant fibers within NFRP materials. The results of these hygrometric characterizations will be taken into account to investigate the cutting of NFRP composites in a cryogenic environment by fundamental analysis (orthogonal cutting process) and functional analysis (industrial machining processes).
Funding category: Contrat doctoral
PHD title: Mechanical engineering
PHD Country: France
The PhD candidate should have good knowledge in the following fields:
- Mechanics of materials
- Machining processes
- Data analysis
- Finite element modeling
EURAXESS offer ID: 453069
Posting organisation offer ID: 87845
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