Dorian Depriester

Dorian Depriester
Ecole Nationale Supérieure d'Arts et Métiers | ENSAM · Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

Doctor of Science and Material engineering
Associate Professor

About

19
Publications
17,627
Reads
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80
Citations
Additional affiliations
October 2016 - May 2019
Ecole Nationale Supérieure d'Arts et Métiers
Position
  • Professor (Associate)
April 2015 - present
Université Grenoble Alpes
Position
  • PostDoc Position
September 2013 - June 2014
Polytech Nice Sophia
Position
  • Research Assistant
Description
  • General mechanics (Practical work)

Publications

Publications (19)
Article
Full-text available
Shape Memory Alloys (SMAs) undergo an austenite–martensite solid–solid phase transformation which confers its pseudo-elastic and shape memory behaviours. Phase transformation can be induced either by stress or temperature changes. That indicates a strong thermo-mechanical coupling. Tensile test is one of the most popular mechanical test, allowing a...
Conference Paper
Full-text available
Cold flowforming is a chipless forming process that deforms tubular parts by reducing their outer diameter and thickness while increasing their length. It consists of a rotating mandrel and one or more rollers that are translated along the tube axis, thus plastically deforming it. Flowforming of Ti-6Al-4V (also known as Ti64) is of great interest f...
Article
Full-text available
This paper investigates the relevance of the representation of polycrystalline aggregates using Radical Voronoï Voronoï (RV) tessellation, computed from Random Close Packs (RCP) of spheres with radius distribution following a lognormal distribution. A continuous relationship between the distribution of sphere radii with that of RV cell volumes is p...
Article
Full-text available
In order to perform Finite Element Analysis (FEA) on a polycrystal, one needs to first generate a mesh based on either EBSD or reconstructed grains. In this mesh, the Grain Boundaries (GBs) must be accurately described since they play an important role in the overall behaviour of aggregates. The proposed software, named MTEX2Gmsh, works regardless...
Article
Modelling the physical behaviour of fibrous materials still remains a great challenge because it requires to evaluate the inner structure of the different phases at the phase scale (fibre or matrix) and the at constituent scale (fibre). X‐ray Computed Tomography (CT) imaging can help to characterize and to model these structures, since it allows se...
Article
Full-text available
In materials science, the microstructures of materials are generally characterized by 2D observation (e.g. electron microscopy). For polycrystalline materials, such as crystalline rocks or ceramics, those observations can be used to measure the grain size distribution. However, the fact that grain sizes are measured in planar cuts introduces a stat...
Method
Full-text available
This paper describes the procedure for generating input data for the CPFEM code PRISMS-Plasticity from EBSD data, using the MTEX2Gmsh toolbox for MATLAB.
Article
Full-text available
The estimation of the grain size in granular materials is usually performed by 2Dobservations. Unfolding the grain size distribution from apparent 2D sizes is commonly referred as the corpuscle problem. For spherical particles, the distribution of the apparent size can be related to that of the actual size thanks to the Wicksell’s equation. The Sal...
Technical Report
Full-text available
In structural analysis, the stiffness method is an easy way to estimate the mechanical behaviour of a structure composed of slender elements (or beam elements), assuming that linear elasticity apply. Such a structure is called a truss. This paper provides with short demonstrations of the basic calculus used for this method and proposes a simple alg...
Conference Paper
Full-text available
Afin d'étudier le comportement d'un matériau cristallin à l'échelle de ses grains, des simulations Elé-ments Finis (EF) tenant compte des propriétés physiques de chacun d'eux peuvent être effectuées. Ces simulations doivent alors tenir compte des hétérogénéités entre phases, des anisotropies locales ainsi que des orientations cristallines locales....
Method
Full-text available
This paper investigates the relationship between the macroscopic elastic properties of a polycrystal with those of each unique crystal. A single phase and a uniform orientation distribution function is assumed. The well-known formula from the Voigt and Reuss approximation are demonstrated in a more comprehensive way (and a more comprehensive langua...
Method
Full-text available
In this paper, the method for computing the stiffness tensor in a random coordinate system, based on a reference one, is detailed. The corresponding transformation may or may not be orthogonal. An algorithm is proposed to compute the stiffness tensor using the 2-index notation (a.k.a Voigt notation).
Method
Full-text available
This paper proposes a general method for computing the Euler Angles with Bunge convention from a given rotation matrix.
Thesis
Full-text available
Flowforming is a means to produce seamless tubes by plastic deformation at room temperature. It consists in a tubular part, mounted on a mandrel, and a couple of rollers. While the mandrel is rotating, the roller translate along the tube axis. Because of the conical shape of the roller, the tube thickness reduces by cold plastic deformation, thus t...
Article
Full-text available
Flowforming is a means to produce seamless tubes by plastic deformation at room temperature. It consists in a tubular part, mounted on a mandrel, and a couple of rollers. While the mandrel is rotating, the roller translate along the tube axis. Because of the conical shape of the roller, the tube thickness reduces by cold plastic deformation, thus t...
Conference Paper
Full-text available
Un prototype instrumenté de fluotournage a été conçu et développé en interne au Cemef, au sein de l’équipe « Mesures, Etudes, Atelier ». Il permet la mise en forme de tubes métalliques à froid par l’action d’une molette qui repousse le matériau. Cette machine vise à une meilleure compréhension des phénomènes mécaniques et physiques auxquels est sou...
Article
Full-text available
Flowforming is a means to produce seamless tubes by plastic deformation at room temperature. It consists in reducing the thickness of a tubular part mounted on a mandrel by deforming it using several rollers translating along the tube axis, while the tube is rotating along its axis. Thanks to the high compressive stresses, and to the incremental na...
Article
Full-text available
The pseudo-elasticity of Shape Memory Alloys is due to a change in volumetric fraction between the high temperature phase (Austenite) and the low temperature phase (Martensite) under a mechanical loading. When a tensile loading is considered, transformation bands occur leading to strong localization of the deformation and a strong local heating. Th...
Article
Full-text available
Les propriétés des AMF sont duesàduesà une transformation de phase solide solide réversible induite par la contrainte ou la température. Pour les AMF de type Ni49,75%at-Ti, c'est une transformation isochore qui, d'une phase cubique (austénite), forme une phase monoclinique (martensite) avec 24 orientations possibles (variantes). A partir des géomét...

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Projects

Projects (2)
Project
Matlab toolbox for generating mesh from EBSD data. It converts data from the well-known MTEX toolbox into Gmsh-readable files. See the dedicated website for examples and details : https://doriandepriester.github.io/MTEX2Gmsh/