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Artigues-près-Bordeaux, France

Perry N.,Arts et Metiers ParisTech | Bernard A.,Ecole Centrale Nantes | Laroche F.,Ecole Centrale Nantes | Pompidou S.,I2M
CIRP Annals - Manufacturing Technology | Year: 2012

The use of composite material increases. End of life regulations, material consumption reductions or restrictions, ask engineers about their potential use. Innovative recycling solutions arise that recover efficiently carbon fibres. This paper explores the design for composites recycling issue. Recycler becomes a new knowledge expert for the designer. It is necessary to analyze their information shares and exchanges. The recycler is an end of life facilitator. He is also the second life material user and can ask for material evolutions. The collaboration must be improved using knowledge performance indicators. These discussions will be enlightened by examples from carbon recycling experiments. © 2012 CIRP. Source

Camenen J.-F.,I2M | Richard P.,University
Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014 | Year: 2015

We investigate numerically granular piles exhibiting steady surface flows. A vertical monolayer of frictional grains is confined between two vertical sidewalls. Above a critical flowing rate and in agreement with experiments (Taberlet, Richard, Valance, Losert, Pasini, Jenkins, & Delannay 2003), surface flows at inclination larger than the angle of repose appear. Below these surface flows, particles exhibit a very slowcreep motion whose velocity decays exponentially with depth (Lemieux & Durian 2000, Komatsu, Inagaki, Nakagawa, & Nasuno 2001, Crassous, Metayer, Richard, & Laroche 2008). Here, we focus on the correlations between the surface flow and the creeping region in the case of steady and fully developed flows. We found that the height of the surface flow and the characteristic decay length of the creeping zone are linked through an affine relation which depends on the micromechanical parameters. Therefore the surface flow and the creeping zone are characterized by only one length. © 2015 Taylor & Francis Group. Source

Pruliere E.,I2M
ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2012 | Year: 2012

Numerical simulations of composite structures are generally performed using multi-layered shell elements in the context of the finite elements method. This strategy has numerous advantages like a low computation time and the capability to reproduce the comportment of composites in most of cases. The main restriction of this approach is that it has only a coarse description of strain and stresses variations in the thickness. This approximation is no more valid when increasing the thickness, near the boundary and loading conditions and when non linear phenomena like delamination occurs in the thickness. This paper explores an alternative to shell computation using the Proper Generalized Methods based on a separated representation. The idea is to solve the full 3D solid problem separating the in-plane and the out-of-plane spaces. Practically, a classical shell mesh is used to describe the inplane geometry and a simple 1D mesh is used to deal with the out-of-plane space. This allows to represents complex fields in the thickness without the complexity and the computation cost of a solid mesh which is particularly interesting when dealing with multi-layer composite. Copyright © 2012 by ASME. Source

Le Guen E.,I2M | Le Guen E.,Arts et Metiers ParisTech | Le Guen E.,Electricite de France | Berthe L.,Arts et Metiers ParisTech | And 2 more authors.
ICALEO 2012 - 31st International Congress on Applications of Lasers and Electro-Optics | Year: 2012

Nowadays, laser machining of metals has some advantages over more traditional processes. For example, there is greater flexibility of use and no mechanical contact with the surface. In micro-machining, shorter pulses reduce heat-affected damage of the material and open new ways for nanometer accuracy. This study presents a new use of pulsed lasers. Indeed, a laser usually used for marking (a few microns deep) has achieved scour over ten millimeter deep over an area of a few square centimeters. The objective of this study is to better understand the potential of the process and by extension to define new ways to develop the applicability of this method. An experimental study was carried out using a pulsed laser with an energy of up to 1 mJ at 1064 nm (pulse duration from 130 to 180 ns, repetition rate of 50 to 100 kHz). The influence of various operating parameters of laser processing has been studied. This paper will discuss preliminary results that concern the optimization of the machining process through improving material removal rate. Source

Zhao Y.F.,McGill University | Perry N.,Arts et Metiers ParisTech | Andriankaja H.,I2M
Re-Engineering Manufacturing for Sustainability - Proceedings of the 20th CIRP International Conference on Life Cycle Engineering | Year: 2013

Manufacturing firms that wish to improve their environmental performance of their product, process, and systems are faced with a complex task because manufacturing systems are very complex and they come in many forms and life expectancies. To achieve desired product functionalities, different design and material can be selected; thus the corresponding manufacturing processes are also changed accordingly. There is direct need of assessment tools to monitor and estimate environmental impact generated by different types of manufacturing processes. This research proposes a manufacturing informatics framework for the assessment of manufacturing sustainability. An EXPRESS information model is developed to represent sustainability information such as sustainability indicators and their associated weighting and uncertainty factors, material declaration information, and hazardous condition information, etc. This information model is tested with industrial products to validate its completeness and correctness. This information model serves as the first step of establishing close association of sustainability information with product design specification. In the next phase of research, investigation will be conducted to integrate sustainability information model and existing standardized product design model ISO 10303 AP 242. Source

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