A quantitative discrete element model to investigate sub-surface damage due to surface polishing

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(1)Science Arts & Métiers (SAM) is an open access repository that collects the work of Arts et Métiers Institute of Technology researchers and makes it freely available over the web where possible.. This is an author-deposited version published in: https://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/8265. To cite this version : Damien ANDRE, Ivan IORDANOFF, Jean-Luc CHARLES, Jérôme NEAUPORT - A quantitative discrete element model to investigate sub-surface damage due to surface polishing - In: Proceedings of ASME 2012 11th Biennial Conferences On Engineering Systems Design And Analysis, France, 2012-07 - ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis - 2012. Any correspondence concerning this service should be sent to the repository Administrator : archiveouverte@ensam.eu.

(2) A QUANTITATIVE DISCRETE ELEMENT MODEL TO INVESTIGATE SUB-SURFACE DAMAGE DUE TO SURFACE POLISHING Damien Andre´ ´ Arts & Metiers ParisTech, I2M-DuMAS, UMR 5295 CNRS, F-33405, Talence, France Email: damien.andre@etu.u-bordeaux1.fr. Ivan Iordanoff Second Coauthor ´ Arts & Metiers ParisTech, I2M-DuMAS, UMR 5295 CNRS, F-33405, Talence, France Email: ivan.iordanoff@ensam.eu. Jean-luc Charles third Coauthor ´ Arts & Metiers ParisTech, I2M-DuMAS, UMR 5295 CNRS, F-33405, Talence, France Email: j.charles@i2m.u-bordeaux1.fr. ´ ome ˆ ´ Jer Neauport fourth Coauthor ´ Commissariat a` l’Energie Atomique, ´ Centre d’Etudes Scientif ques et Techniques d’Aquitaine, F-33114 Le Barp, France Email: jerome.neauport@projet-lmj.org. ABSTRACT This work is a continuation of a previous study that investigated sub-surface damage in silica glass due to surface polishing. In this previous study, discrete element models have shown qualitatively good agreement with experiments. The presented work propose a model allowing quantitative results by focusing on the continuous part of the problem. Special attemption was given to the discrete element model of silica glass considered as perfectly isotropic, elastic and brittle. To validate this approach, numerical results are compared to experimental data from literature.. on pre-existing Sub-Surface Damages (SSD) created during the polishing processes [2–7]. The discrete element method (DEM) is proposed to simulate the polishing process and its impact on sub-surface damage creation. Discrete element model is well adapted to simulate a media that has a great number of interfaces. It has been widely used to study tribological problems like wear phenomena [8–14]. In this kind of problem, the material has a continuous part (the volume above the surface that is not yet affected by the wear), a continuous part with cracks (called sub-surface damage in abrasion process terminology) and a discontinuous part (the interfacial media, called third body, that is a mixture of abrasive particles and wear particles). Discrete element model must be able to simulate with accuracy all these parts of the material.. Introduction When fused silica optics are submitted to high-power laser (such as megajoule laser or National Ignition Facility) at the wavelength of 351 nm, fused silica optics can exhibit damage, induced by the high amount of energy traversing the part [1]. Current researches have shown that this damage could be initiated. This work is a continuation of a previous study that investigated sub-surface damage in silica glass due to surface polishing [15]. In this previous study, discrete element models have shown qualitatively good agreement with experiments. The presented work propose a model allowing quantitative results by fo1.

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