Thierry Coorevits

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• Professor (Assistant) at École nationale supérieure d'arts et métiers

Composite materials are increasingly used in 3D metrology, especially for portable measuring devices such as articulated arm coordinate measuring machines (AACMM), 3D scanners, and ball bars. Their use is justified by their interesting mechanical properties including their low density, good rigidity, and especially their light weight, which makes t...

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...

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, (...

If the problems related to the parts and measurement strategy of Coordinate Measuring Machines (CMMs) are not taken into consideration, temperature variations become the main source of measurement uncertainties. Indeed, they may cause variations in geometry as well as reference point drift. The effect of drift is sometimes minimized by CMM users an...

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...

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...

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,...

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...

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...

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)...

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...

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...

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...

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...

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...

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...

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...

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...

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,...

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...

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...

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...

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...

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 propos...

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...

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...

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...

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...

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...

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...

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...

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...

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...