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M. JAUFFRES David

Assistant Professor Phelma/Grenoble-INP

Contact details

101 rue de la physique 38402 Saint Martin d'Heres cedex

  • Tél. : 04 76 82 63 37

Personal Website : http://

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Teaching activities

Numerical Methods (BIOMED 2A)
Material and process selection (SIM 3A)
Materials science modelling projects (SIM3A)
Materials science practical works (SIM 2A)

Research activities

Research interest : Mechanics of materials - Discrete simulations - Multi-physics modeling - 3D image-based modeling - Architectured materials - Ceramic materials - Porous materials

Publication list : google scholar

Talks : figshare.com
 

PhD Students
2018 - ... G. Hamelin "Silica aerogel based thermal super-insulation panels: mechanical properties optimization"
2016 - ... N. Khamidy "Microstructure, durability and modelling of solid oxide cell materials"
2016 - ... K. Radi "Nacre-like alumina: from the proof of concept to the optimal microstructure"
2015 - 2018 E. Guesnet - "Modélisation du comportement mécanique et thermique des silices nano-architecturées"
2013 - 2016 O. Celikbilek - "An experimental and numerical approach for tuning the cathode for high performance IT-SOFC"
 
Recently published work
  • Elasticity and fracture of brick and mortar materials using discrete element simulations

    DEM modeling of brick and mortar materials

    Fracture behavior of a representative volume element of a bioinspired nacre-like material with brittle interfaces by DEM. Number of broken bonds per particles for the three cases of crack initiation and propagation. (a) Interface fracture initiation and propagation (b) Interface fracture initiation and tablet fracture propagation (c) Tablet fracture initiation and propagation.K. Radi et al., Journal of the Mechanics and Physic of Solids, 126 101–116 (2019).

  • A growth model for the generation of particle aggregates with tunable fractal dimension
Figure Porous Eden Growth

An original method is proposed to efficiently generate numerically aggregates with decreasing fractal dimension. E. Guesnet et al., Physica A: Statistical Mechanics and its Applications, 513 63–73 (2019).

 
  • Design of strain tolerant porous microstructures – A case for controlled imperfection (coll. R.Bordia, Clemson University)
Scaling laws for homogeneous porous microstructures obtained by partial sintering of ceramic powders.  (a) Scaling law for the relative Young's modulus. (b) Scaling law for the dimensionless fracture toughness. Z = coordination number; ab/R normalized neck size between particles. D. Jauffrès et al., Acta Materialia, 148 193–201 (2018).

 
  • Fast in-situ nanoimaging of particle sintering (coll. ESRF)
In situ X-ray nanotomography of glass particles sintering at 670°C. (a) 3D rendering of the investigated volume showing the growth of four segmented necks (I–IV). (b) Neck IV surface mesh displaying maximum principal curvature. (c) Neck radius versus time. a/R refers to the relative neck radius (neck radius: a, particle radius: R). The dashed vertical lines correspond to the 3D images in (a). (d) Comparison between experimental maximum principal curvature (symbols) and the tangent-circle approximation (dashed lines) as a function of the distance z from the neck plane. J. Villanova et al., Mat. Today 20, 354–359 (2017).
 
  • Rational design of SOFC cathodes with hierarchical porosity (coll. LEPMI, O.Celikbilek PhD)
Rational design of SOFC electrodes with hierarchical porosity
(a) FIB-SEM tomography of cathodes films obtained by Electro Spray Deposition (top: LSCF film, bottom: 60:40 %vol LSCF:CGO film). (b) FEM model of a nanoporous column. The model accounts for oxygen surface exchange (at the column surface and in the nanopores) and for oxygen bulk diffusion. The model compares favorably with Electrochemical Impedance Spectroscopy measurements on the cathodes characterized by FIB-SEM tomography. (c) Design guidelines from the FEM model to tune the CGO and nanoporosity content (T=500°C / average nanopore size 60nm / 15% macroporosity). Experimentally, an Area Specific Resistance (ASR) of 0.35 ohm.cm² was achieved at 550°C by the 60:40 % LSCF:CGO film. Performance could be pushed further by increasing further the SOFC content but unfortunately such films lacked mechanical adhesion with electrolyte. O. Çelikbilek et al.,  J. Power Sources 333, 72–82 (2016).
 

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Date of update April 8, 2019

Univ. Grenoble Alpes