Thierry Coorevits

Thierry Coorevits
Ecole Nationale Supérieure d'Arts et Métiers | ENSAM · Laboratoire Mécanique, Surfaces, Matériaux et Procédés (MSMP)

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46
Publications
35,304
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177
Citations
Citations since 2016
18 Research Items
139 Citations
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20162017201820192020202120220102030
20162017201820192020202120220102030

Publications

Publications (46)
Article
Full-text available
The manufacturing processes of electrical machines may lead to significant degradation of the magnetic properties of their magnetic core (stator, rotor) performances and, as a consequence, to a decrease of their energy efficiency. While the effects of some processes (cutting, welding …) are widely discussed in the literature, this is not the case w...
Article
The accuracy in the determination of the mechanical properties by instrumented indentation strongly depends on the indenter/material contact area, the corrective compliance, and the indenter tip defect. For the calibration, we suggest to combine 3 functions: (i) a Force-function, where only the corrective compliance term is the unknown parameter, (...
Article
In the present work, a Si/Zr based sol–gel (SG) coating was deposited on 316L stainless steel plates, previously treated by passivation (SSO) or electropolishing (SSEP) producing two different surface states. The SG coatings were compared for SSO and SSEP substrates in terms of morphology, topography and tribocorrosion response. The coating topogra...
Article
This investigation addresses the effect provided by industrial surface finishes on the tribocorrosion properties of 316L stainless steel exposed to NaCl solution. Three distinct surface treatments were evaluated: passivation (SSO), electropolishing-passivation (SSEP) and micro-undulation (SSM mechano-chemical + electropolishing + passivation). For...
Article
This paper proposes a periodic verification/acceptance test for Articulated Arm Coordinate Measuring Machine (AACMM). The verification tests recommended by standards dedicated to AACMM are generally time consuming and require bulky artifacts. In fact, the volumetric test of ISO 10360-12 requires measuring five lengths in seven different directions,...
Article
Determination of hardness profiles of Functionally Graded Materials could be currently performed by two principal methods. One method consists in the measurement of hardness on the cut cross-section of the sample, which is destructive, expensive and time consuming. Another method involves the measurement of hardness at the surface with increasing l...
Article
The basis of the virtual machine concept, which is commonly used in coordinate measuring machines, was implemented to determine more realistic uncertainties on the estimation of the elastic modulus obtained from nanoindentation tests. The methodology is based on a mathematical model applied to simulate the testing process and to evaluate the uncert...
Article
In order to verify the performance of articulated arm coordinate measuring machines, the standards/guidelines that address this topic require the use of different length artefacts. For instance, the volumetric test of ISO 10360-12:2016 requires measuring five calibrated lengths in seven directions (three horizontal, three diagonal and one vertical)...
Conference Paper
Full-text available
Composite materials are increasingly used in 3D metrology devices. Their use is justified by their interesting mechanical properties including their low density and good rigidity but especially their low coefficient of thermal expansion. In fact, in order to improve production efficiency, companies nowadays integrate more and more control equipment...
Article
This paper proposes a quick and efficient methodology of uncertainty estimation on measurement results provided by an articulated arm coordinate measuring machine (AACMM). The methodology is highly adapted to industrial applications - a frequent use of these devices - but can also be performed in laboratories. The study stems from an actual need am...
Article
Full-text available
This paper shows the influence of the manufacturing process of a claw-pole alternator on its acoustic noise. First, the stator welds and the assembly of the stator in the brackets are linked to deformations of the inner diameter of the stator. Then, the influences of these deformations on the magnetic forces and the subsequent acoustic noise are in...
Article
Full-text available
In the literature, the most studies conducted on the flat surface ball-burnishing process have been focused on the most important classical factors like burnishing speed, lateral feed, and the ball-burnishing load or pressure on the treated surfaces integrity enhancement. In this research, ball-burnishing strategies are studied as a new ball-burnis...
Article
Full-text available
The unloading part of a load–displacement curve from instrumented indentation tests is usually approximated by a power law (Oliver and Pharr model), where the load is the dependent variable. This approach generally fits well the data. Nevertheless, the convergence is occasionally quite questionable. In this regard, we propose a different approach f...
Article
According to the standard ISO 10360-2 (2001 Geometrical product specifications (GPS)—acceptance and reverification tests for coordinate measuring machines (CMM)—part 2: CMMs used for measuring size (ISO 10360-2:2001)), we verify the coordinate measuring machine (CMM) performance against the manufacturer specification. There are many types of gauges...
Conference Paper
This paper shows the influence of the manufacturing process of a claw-pole alternator on its acoustic noise. First, the stator welds and the assembly of the stator in the brackets are linked to deformations of the inner diameter of the stator. Then, the influences of these deformations on the magnetic forces and the subsequent acoustic noise are in...
Article
In mass production, fabrication processes of electrical machines are not perfectly repeatable with time, leading to dispersions on the dimensions which are not equal to their nominal values. The issue is then to link the dispersions on the dimensions which are uncertain to the performances of electrical machines in order to evaluate their influence...
Conference Paper
Full-text available
3 Centre Technique des Industries Mecaniques (CETIM) - 52, avenue Felix-Louat - BP 80067 - 60304 Senlis Cedex2 Abstract. Monte Carlo method have been introduced in metrology in the 1990's and integrated in the GUM (Supplement 1) in 2008. This method is more and more used. Typically the users of this method realize a complete simulation in one step,...
Article
Imperfections of the manufacturing process can modify the shape of the electrical machine parts which dimensions are then not equal to the nominal ones. In this communication, the influence of three types of stator deformation is studied in the case of a synchronous claw pole machine with a non linear 3D finite element model accounting for the move...
Article
Full-text available
p>La mesure de la conductivité électrique est classiquement réalisée sur des échantillons de géométrie simple à partir desquelles la grandeur d'intérêt peut être aisément déduite. Lorsqu'il n'est pas possible d'extraire des échantillons respectant ces critères géométriques, dans le cadre d'une étude non-intrusive par exemple, d'autres approches doi...
Article
The straightness error of a coordinate measuring machine (CMM) is determined by measuring a rule standard. Thanks to a reversal technique, the straightness uncertainty of the CMM is theoretically dissociated from the straightness uncertainty of the rule. However, stochastic variations of the whole measurement system involve uncertainties of the CMM...
Article
Full-text available
Le supplément 1 [JCGM 101:2008] du guide pour l'expression des incertitudes de mesure de 2008 complète le GUM (Guide to the expression of uncertainty in measurement) [JCGM 100:2008] en proposant une nouvelle approche pour l'estimation des incertitudes de mesure. Il concerne la propagation des distributions des variables (paramètres) d'entrée à trav...
Article
Full-text available
In this paper an inverse finite element procedure was developed to assess the true-stress strain relationship of a DP dual phase. Experiments were performed both by means of instrumented indentation and small punch tests on small samples cut in the same steel sheet. Tests are developed on a Zwick macro-hardness tester. Single test are first propose...
Article
Knowing that a surface or profile can be characterized by numerous roughness parameters, the objective of this investigation was to present a methodology which aims to determine quantitatively and without preconceived opinion the most relevant pair of roughness parameters that describe an abraded surface. The methodology was firstly validated on si...
Conference Paper
Full-text available
In this work, the straightness length 300 mm measurement under nanometer uncertainty. The proposed methodology represents a process known as propagation using the assumption of small displacement which leads to solving an overdetermined linear system. The experimental studies were carried out on the capacitive sensors and electronic levels. The lea...
Chapter
We propose a model of three-dimensional behavior of the dynamic probes. This model uses the hypothesis that for at least one contact point, the effort becomes zero when the probe records the measure. An experimental verification shows the quality of the model. We then propose a new model which combines an experimental 2D measure with a very simple...
Conference Paper
Full-text available
The Laboratoire National de Métrologie et d’Essais (LNE) has developed an innovative ultra precision coordinate measuring machine [LAH07] traceable to the national length standard to measure three-dimensional objects with nanometric uncertainties (figure 1). The measuring range is 300 mm x 300 mm x 50 μm. The objective in term of uncertainty is to...
Article
The objective of this work was to identify the mechanisms leading to deterioration of the polyethylene acetabular surface in total hip prostheses. We conducted an in vivo analysis of damage caused to articulating surfaces of metal-on-polyethylene total hip prostheses. This analysis was performed on three of the 45 explants of Harris-Galante prosthe...
Article
Ce travail présente une méthode pour évaluer l’endommagement in vivo des pièces de frottement des prothèses totales de hanche. Celle-ci a été appliquée à l’analyse de trois des 45 inserts de Harris-Galante dont nous disposions à partir d’une série de 1 480 implantations pratiquées entre 1985 et 1996. Ces trois inserts ont été sélectionnés car des d...
Article
The intercomparison EA L M18 has shown that the calculations on screws had to be reviewed. The participants gave some values with differences of a few 10 μm with the reference method. This method developed by Berndt in May 1940 is not however exact in all cases If we take a screw with a great difference between the two angles and a great angle of h...
Article
Full-text available
This paper develops, from a first experimental study, a critical analysis of the contemporary global calibration method. Then, it presents a physical study of the factors affecting robot performances. In particular, an original description of the effect in a mechanical coupling parallelogram structure as well as an analysis of the joint offset defi...
Article
Errors elimination of a standard using sign change is a well-know method in order to define lacks of straighness or squareness of a measuring machine. The paper presents how it is possible to eliminate geometrical errors even on complex standards (with some symetry conditions) by using a permutation technique. The method is presented from a mathema...

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Project
increase the electrical machine efficiency