Discrete element method, a tool to investigate complex thermo mechanical behaviour: application to friction stir welding
TypeArticles dans des revues avec comité de lecture
In material forming or cutting, the contact zone between the tool and the working piece is often very difficult to analyse because of diverse local phenomena. In the special case of FSW, a specific difficulty is the study of material mixing. In this work, the Discrete Element Method is applied as a tool to understand/propose/confirm physical scenarii involved in FSW process. A simple micro behaviour law that takes into account thermal, mechanical and material aspects is proposed and a two dimensional simulation based on this law is presented. The first results show qualitatively good agreement with real nuggets observations. One of the main advantages of DEM approach is the simplicity of the local input law compared with laws proposed at the continuous media mechanics level. Nevertheless, numerical aspect must be improved to carry out three dimensional simulations with reasonable calculation times.
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TERREROS, Inigo; IORDANOFF, Ivan; CHARLES, Jean-Luc (2011)Discrete Element Method (DEM) uses a set of discrete elements in order to describe the material under study. The reason is that originally it was conceived to describe granular materials. Thus is naturally adapted to ...
TERREROS, Inigo; IORDANOFF, Ivan; CHARLES, Jean-Luc (Elsevier, 2012)Currently, almost all material manufacturing processes are simulated using methods based on continuum approaches such as the Finite Element Method (FEM). These methods, though widely studied, face di culties with multi- ...
JEBAHI, Mohamed; DAU, Frédéric; CHARLES, Jean-Luc; IORDANOFF, Ivan (Springer, 2014)Multiscale modeling aims to solve problems at the engineering (macro) scale while considering the complexity of the microstructure with minimum cost. Generally, two scales are considered in multiscale modeling: small scale, ...
ANDRE, Damien; IORDANOFF, Ivan; CHARLES, Jean-Luc; NEAUPORT, Jérôme (ASME, 2012)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 ...
Using the discrete element method to simulate brittle fracture in the indentation of a silica glass with a blunt indenter ANDRE, Damien; JEBAHI, Mohamed; IORDANOFF, Ivan; CHARLES, Jean-Luc; NEAUPORT, Jérôme (Elsevier, 2013)The mechanical behavior of materials is usually simulated by a continuous mechanics approach. However, noncontinuous phenomena such as multi-fracturing cannot be accurately simulated using a continuous description. The ...