Julien Yvonnet's blog

We are looking for highly motivated PhD candidates to study the multiscale cracking in 3D printed glass-polymer composites. The main objectives of the project are to develop a multiscale numerical modeling framework for cracking in PA12/glass beads samples obtained by additive manufacturing (Selective Laser Sintering, SLS) and to combine these numerical tools with experimental 3D imaging and in-situ mechanical testing techniques to identify the models. The PhD is part of a funded national research project involving several academic institutions and an industrial partner.

The master Mechanics of Materials and Structures for Civil Engineering and Transportation Systems (MMSCT) is a one-year program offered at UPEM (University Paris-East Marne-la-Vallée), France (20 min from Paris center by transportations). The program aims at providing the students with deep scientific and technical knowledge about the multiscale modelling, over a broad range of scales, of complex materials and structures.

You are welcome to submit abstracts to the MS 301 "Multiscale Computational homogenization for bridging scales in the mechanics and physics of complex materials", organized by P. Wriggers, K. Terada, M. Geers, M. Cho and myself at the 13th US National Congress on Computation Mechanics (USNCCM), July 26-30, 2015, in San Diego CA, USA.

http://13.usnccm.org/

The  deadline for abstract submission is February 15, 2015.

The topics of the MS can be found here:

http://13.usnccm.org/MS301

M.T. Hoang, J. Yvonnet, A. Mitrushchenkov, G. Chambaud, First-principles based multiscale model of piezoelectric nanowires with surface effecs, Journal of Applied Physics, 113(1):014309, 2013

http://jap.aip.org/resource/1/japiau/v113/i1/p014309_s1

Post-print :

http://hal-univ-mlv.archives-ouvertes.fr/docs/00/77/09/98/PDF/_39_Pre_Pr...

You are welcome to submit abstracts to the MS 4.5 "Multiscale Computational homogenization for bridging scales in the mechanics and physics of complex materials", organized by P. Wriggers, K. Terada, V. Kouznetsova, M. Cho and myself at the 12th US National Congress on Computation Mechanics (USNCCM), July 22-25, 2013, in Raleigh, USA.

http://12.usnccm.org/

The  deadline fo abstract submission is February 15, 2013.

The topics of the MS can be found here:

Abstracts can still be submitted to the ECCOMAS 2012 Mini-Symposium MS 102 "Multiscale Computational Homogenization for bridging scales in the mechanics and physics of complex materials", co-organizers : J. Yvonnet, M. Geers, K. Terada, P. Wriggers, until December 15, 2011.

http://eccomas2012.conf.tuwien.ac.at/scientific-programme/mini-symposia.html 

Looking forward to meet you in Vienna

Several methods have been proposed for numerical homogeniation of linear viscoelastic materials, mainly based on Laplace transform or on multilevel (FE^2) approaches. In this paper, we introduce a much simpler technique based on a discrete representation of the effective relaxation tensor related to the homogeneous medium, which can then be used to evaluate the constitutive law in the form of a convolution product. In practice, calculations on the RVE reduce to 3 transient simulations in 2D and 6  in 3D. More details in

We are inviting abstracts for the following special session: Multiscale Computational Nanomechanics, Sixth MIT conference on Computational Fluid and Solid Mechanics, June 15-17, 2011, Cambridge, MA, USA.

http://www.sixthmitconference.org/

Abstract submission deadline: February 15, 2011.

The topics covered by this special session include (but are not limited to):

-Continuum modeling incorporating nanoscale effects

Model reduction based on Propper Orthogonal decomposition is widely used in Computational mechanics to reduce the number of degrees of freedom in systems. In the attached papers, we introduced a POD-based model reduction in a multiscale framework to significantly reduce the computations.

The University Paris-Est Marne la Vallée, France, invites applications for two tenure-track faculty positions in multiscale computational mechanics, as assistant professor level, for September 2010 start date. The candidates will be hosted by the Laboratory of Multiscale Computational Mechanics (Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS). Successful candidates are expected to teach at the undergraduate and graduate levels, and carry out a research program with potential collaborations at the European and International level.

We are inviting abstracts for the following symposium: Multiscale methods for modeling surface effects on nanosystems and nanostructured materials, European Conference on Computational Mechanics (ECCM IV), May 16-21, 2010, Paris, France.
http://ww/eccm2010.org/index.php

In the attached paper, we propose a procedure combining an XFEM/level-set technique and Gurtin-Murdoch surface elasticity to model nanostructures with arbitrary geometries. The effects of free surface which are dominant at small scales are easily captured in this framework.