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ESR8: Periodic inclusions in auxetic media PhD Position at UoB (University of Bristol, UK) and ECL (Ecole Centrale de Lyon, FR)
Ecole Centrale de Lyon, Ecully
LTDS
Engineering 
Full Description:

Objectives
The project will investigate the use of new core materials and their interactions with the global properties of the periodic core through the following steps:
1- Perform the characterisation of novel natural-reinforced off-the-shelf prepregs (flax/hemp) from the mechanical and dynamics points of view using a combination of tensile and shear quasi-static testing, dynamic mechanical analysers (DMA) for the viscoelastic behaviour and vibration testing for modal damping ratios on standard-size specimens.
2- Develop coatings with solvents (polyurethane based) and dispersions of carbon nanotubes and nanoplatelets compatible with painting/spraying techniques over state-of-the-art core material for honeycombs (aramid paper or high-performance Kevlar). The coatings will be applied to standard-size specimen of the honeycomb material substrate for mechanical, viscoelastic and dielectric characterisation.
3- Manufacture honeycomb specimens using the natural fibre prepregs and the aramid paper/Kevlar nanocoated materials. The honeycombs will be based on regular hexagonal topology and built using Kirigami-type techniques. Samples of honeycombs without the nanocoating and with the solvent coating only (polyurethane) will be built as control specimens. The honeycombs will be used to produce sandwich panels according to tests sizes using commercially available skin laminates and autoclave techniques.
4- Use state-of-the-art analytical and numerical models to investigate the mechanical and vibroacoustics behaviour of the honeycombs with the material properties of the novel cores. Closed-form solutions and Finite Elements will be used to simulate the quasi-static behaviour, existing analytical models and Bloch Wave FE approaches will be used for the wave propagation and acoustic radiation predictions.
5- Perform the mechanical and vibroacoustics characterisation of the sandwich panels. The mechanical tests will be carried out through standard ASTM procedures (flatwise compression, transverse shear, impact loading). The vibroacoustics behaviour will be assessed through a series of modal analysis tests, vibration and acoustic transmissibility. The tests will be carried out according to Design of Experiments (DoE) procedures.
6- Compare and develop figures of metrics to evaluate the performance of the honeycombs with the novel core materials in view of the simulations and experimental results obtained

Expected Results
Assessments of the core material characteristics influence on the viboracoustic properties. Guideline for optimization of the core material with periodic concepts.



Posted on: 30 May 2016Deadline to apply: 01 September 2016Start Date: 01 October 2016 Duration: 36 months
The Fund category is Mixed Funding and the salary is 35-40k€ annual gross
Doctoral School is Doctoral program in physical and engineering sciences in the Rhône-Alpes Region.

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