Adrien Van Gorp's research while affiliated with French National Centre for Scientific Research and other places
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Publications (26)
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...
This paper deals with the analysis of the magnetic properties degradation following an industrial impregnation process of electrical steels employed in stators of large generators. First, the impregnation process is studied directly on industrial stators to emphasize the significance of the process effect. Then, to have a controlled approach of the...
This paper deals with the experimental investigation of the effect of impregnation process on the normal magnetization curve and iron losses of electrical steels. To address this issue, several laminated toroidal magnetic circuits have been designed to characterize the magnetic properties with the flux metric method. The first configuration conside...
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...
In this article, an experimental procedure is presented to handle magnetic measurements under uniaxial tensile stress reaching the plastic domain. The main advantage of the proposed procedure is that it does not require an additional magnetic core to close the magnetic flux path through the studied sample. The flux flows only in the sample, and no...
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...
The impact of different industrial surface treatments, such as electropolishing and micro-undulation, on the mechanical and corrosion properties of cold-rolled 316L stainless steel has been investigated. The nature of the passive layers created by the three surface finishes led not only to chemical differences as determined by XPS analysis, but als...
Resumen
Las propiedades de los recubrimientos a base de circonia estabilizada con ytria (YSZ) confieren a estos un excelente desempeño en una amplia gama de aplicaciones que van desde el uso odontológico hasta barreras térmicas, incluyendo también su empleo como electrolitos sólidos en celdas de combustible. En el presente trabajo, se depositaron r...
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...
Numerous methods have been proposed to estimate the indentation fracture toughness Kic for brittle materials. These methods generally uses formulæ established from empirical correlations between critical applied force, or average crack length, and classical fracture mechanics tests. This study compares several models of fracture toughness calculati...
This article proposes to analyze the relation between gloss and roughness of surfaces of polypropylene samples abraded at different magnitudes. Experiments consist of mechanical polishing at different grades, roughness profiles measurement, and specular light reflectometry with three incidence angles of resulting surfaces. About 100 roughness param...
Considerable improvement in the tribological response was achieved during sliding wear tests against alumina ball, when AA 2024-T3-aluminium alloy substrate was coated with DLC/NiP duplex coating. Quantitative EPMA analysis carried out on the coated sample cross-section coupled with nanoindentation techniques allowed the identification of the coate...
Nanostructured yttria-stabilized zirconia coatings for applications in high-temperature environments can be deposited by suspension plasma spraying (SPS) techniques. The present research has been conducted in order to study the sliding wear response of a SPS ZrO2–8% mol. Y2O3 coating (75 μm in thickness) deposited onto a Haynes 230 substrate, using...
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...
Les auteurs remercient MM. Gaetan Starzyk, Florian Baratto et Nicolas Charoy pour le travail effectue lors de leur projet de fin d’etude ingenieur Arts et Metiers au centre de Lille, travail qui a permis la mise en place du dispositifd’essai et la realisation des essais mecaniques de caracterisation des echantillons. De meme, nous remercions Arcelo...
This paper outlines a new method to evaluate roughness parameters considering the scale used for their evaluation. Application is performed for grinding hardened steel with abrasive belts. Seven working variables are considered through a two-level experimental design. For all configurations, 30 surface profiles were recorded by tactile profilometry...
The roughness of polymer surfaces is often investigated to guarantee both the surface integrity and the surface functionality. One of the major problems in roughness measurement analyses consists in determining both the evaluation length and the reference line (i.e., the degree of the polynomial equation) from which roughness parameters are compute...
The characterization of functional surfaces is done mainly by roughness which can be quantified by many parameters. In order to select relevant roughness parameters, a multiscale discriminant method is proposed and applied to characterize high-precision turned surfaces. First, surfaces are characterized by a single roughness parameter and secondly...
This paper proposes a new multi-scale measurement approach performed to compare the surface roughness and the visual aspect of polished surfaces. In this investigation, five specimens of glass moulds presenting different visual aspects are considered. All roughness profiles assessed by tactile profilometry were rectified by a first degree polynomia...
After one hour immersion (adsorption) in nano-colloidal suspensions, mesoscopic (μm scale) aggregation networks of gold nanoparticles (25 nm) are formed on a methyl/amine terminated surface (CH3/NH2) and followed by the substrate drying. A Monte Carlo simulation is then performed to model these patterns in microscopic scale. It is revealed that a t...
Citations
... Yet, few have been concerned by the impregnation process of large generator stators. In the literature, apart from our previous work [5] that reported the preliminary observations of this process effects, there is only a paper [4] dealing with the evolution of the iron losses of a stator having undergone a "varnish process" without detailing its physical implications on the iron core performances. ...
... Crevice corrosion may occur under the deposits, impurities, or in locations where the aggressive chloride medium is retained for a longer period due to poor design solutions [2][3][4][5]. Improvement of the stainless steel corrosion resistance can be achieved by the chemical modification of the steel surface using the corrosion inhibitors, as well as by protective amorphous or crystalline coatings, such as TiO2, ZrO2 or SiO2 thin films or their mixtures [6][7][8][9], low-temperature plasma carburizing, nitriding, combined carburizing and nitriding, etc. [10][11][12]. Ceramic coatings can be deposited on the substrate by several various techniques that have been developed for this purpose. ...
... More recently, some authors explored the impact of plasticity by comparing the magnetic behavior of plasticized materials in the loaded and unloaded states. El Youssef et al. (2020) showed that the application of tensile stress on prestrained non oriented Iron-Silicon samples resulted in a reduction of the deterioration caused by plastic strain until a characteristic stress value is attained. Above this threshold, the magnetic behavior deteriorates again. ...
... To complete the electrochemical analysis of the preand-post-treated specimens, current plots were obtained from potentiostatic loading (i.e., pure mechanical loading) conditions. As shown in Fig. 12, the current response of all tribo-loaded specimens experienced a negative current response, indicating that the main mechanism of electrochemical activity was through oxygen reduction reactions [54]. Conversely, it is interesting to note that the CS specimen experienced a stable current response, whereas the degree of current fluctuations increased in the CS + HT and CS + HT + FSP specimens. ...
... In contrast, far fewer works treat the multiaxial problem, and they deal mainly with in-plane biaxial loading. Nevertheless, some works [36][37][38] can be found where the magnetic field is applied in a direction different from that of the applied uniaxial stress. In [36], only a single C-yokethat can be rotatedwas used. ...
... [24][25][26] are mainly focused on heat exchanger tubes. Studies on the commonly used 316L alloy have shown that factors such as surface treatment [27], applied potential [28][29][30], type of solution [29], and number of cycles [30] significantly affect the tribocorrosion behavior of this alloy. The passivation behavior complicates the tribocorrosion behavior of the passive metal due to the interaction between the deterioration of the base metal and oxidation of the metal [31]. ...
... For example, in [3,4] the impact of several manufacturing processes on the magnetic properties of NO electrical steel sheet is investigated, it shows a magnetic behavior degradation as well as significant iron loss increase. Some studies are focused on quantifying the impact of manufacturing process on magnetic properties like the cutting techniques [5][6][7][8]. In [9] for example, the authors show that the iron loss can be reduced by about 5.8% when minimizing the cutting clearance of a punching process. ...
... Advances in manufacturing technologies are typically implemented due to the effect of raising the quality of products produced or enabling a reduction in the cost of production. In the automotive industry, electric machines (or motors) have thin metal sheet components which are currently manufactured by stamping, which has been the case for a number of years [1,2]. a1111111111 a1111111111 a1111111111 a1111111111 a1111111111 ...
... The results indicated that the optimal surface roughness of 0.085 lm was obtained at the BS of 75 m/min, FR of 0.073 mm/rev, number of passes of 4, and interference of 6.2 mm, respectively. Amdouni et al. indicated that the surface roughness of the compressed aluminum alloy could be decreased by 36.8% with the support of optimality data (Amdouni et al. 2017). Moreover, the perpendicular tool path was an effective solution to enhance surface properties. ...
... The highest average hardness values were observed at 100 nF capacitance, and adding powder did not always lead to an increase in hardness. It should be considered that the hardness value of hydroxyapatite is considerably smaller compared to the alloy [42,43]. Its deposition can result in a slight drop in surface hardness. ...