References of "Zhang, Lihong"
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See detailParametric study of metal/polymer multilayer coatings for temperature wrinkling prediction
Zhang, Lihong ULg; Habraken, Anne ULg; Ben Bettaieb, Amine ULg et al

in Journal of Materials Engineering & Performance (2013), 22(9), 2437-2445

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See detailNew Solid-Shell Finite Element Based on EAS and ANS Concepts for Sheet Metal Forming
Ben Bettaieb, Amine ULg; Duchene, Laurent ULg; Zhang, Lihong ULg et al

in AIP Conference Proceedings (2011), 1383

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See detailAMP-activated protein kinase (AMPK) activation and glycogen synthase kinase-3beta (GSK-3beta) inhibition induce Ca2+-independent deposition of tight junction components at the plasma membrane.
Zhang, Lihong ULg; JOURET, François ULg; Rinehart, Jesse et al

in Journal of Biological Chemistry (2011), 286(19), 16879-90

Extracellular Ca(2+) is essential for the development of stable epithelial tight junctions. We find that in the absence of extracellular Ca(2+), AMP-activated protein kinase (AMPK) activation and glycogen ... [more ▼]

Extracellular Ca(2+) is essential for the development of stable epithelial tight junctions. We find that in the absence of extracellular Ca(2+), AMP-activated protein kinase (AMPK) activation and glycogen synthase kinase (GSK)-3beta inhibition independently induce the localization of epithelial tight junction components to the plasma membrane. The Ca(2+)-independent deposition of junctional proteins induced by AMPK activation and GSK-3beta inhibition is independent of E-cadherin. Furthermore, the nectin-afadin system is required for the deposition of tight junction components induced by AMPK activation, but it is not required for that induced by GSK-3beta inhibition. Phosphorylation studies demonstrate that afadin is a substrate for AMPK. These data demonstrate that two kinases involved in regulating cell growth and metabolism act through distinct pathways to influence the deposition of the components of epithelial tight junctions. [less ▲]

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See detailInvestigation of the Efficiency of the Ti555 Compared with TA6V Alloy in the Case of an Aeronautic Application
Ben Bettaieb, Mohamed ULg; Van Hoof, T.; Zhang, Lihong ULg et al

in Proceedings of the 12th World Conference on Titanium (2011)

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See detailInvestigation of the efficiency of the Ti555 compared with TA6V alloy in the case of an aeronautic application
Ben Bettaieb, Mohamed ULg; Van Hoof, T.; Zhang, Lihong ULg et al

in The 12th World Conference on Titanium Ti-2011 (2011)

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See detailTemperature wrinkling prediction in metal/polymer multilayer coatings
Zhang, Lihong ULg; Ben Bettaieb, Amine ULg; Habraken, Anne ULg et al

in International Journal of Material Forming (2010, April), 3(supplement 1), 559-562

Two modeling approaches, analytical and numerical ones were carried out to simulate the mechanical behaviour of a coated metal steel sheet under thermo-mechanical loads. As the metallic film and the ... [more ▼]

Two modeling approaches, analytical and numerical ones were carried out to simulate the mechanical behaviour of a coated metal steel sheet under thermo-mechanical loads. As the metallic film and the polymer layer have different dilatation coefficients, temperature increase and/or humidity variation can result in a compressive state in the metallic film, and yield to bucking. This phenomenon is called wrinkling. It can be prevented by a stiff polymer layer or a stable film due to adapted thickness and mechanical properties. Wrinkling phenomenon has received increasing attention because of important uses of polymeric coating in many industrial applications. To better understand and predict this phenomenon, analytical and numerical models have been developed and compared. [less ▲]

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See detailValidation d'un calcul thermique métallurgique
El Bartali, Ahmed ULg; Zhang, Lihong ULg; Studer, Léo ULg et al

in Appolaire, B.; Arbab Chirani, S.; Calloch, S. (Eds.) et al Mécanique et mécanismes des changements de phases (2009)

Les sollicitations thermomécaniques en général, et les traitements thermiques en particulier, constituent un mode de sollicitation rencontré fréquemment dans le milieu industriel. Pour répondre aux ... [more ▼]

Les sollicitations thermomécaniques en général, et les traitements thermiques en particulier, constituent un mode de sollicitation rencontré fréquemment dans le milieu industriel. Pour répondre aux besoins industriels, réduire les coûts et augmenter les cadences de fabrication, éviter les fissurations et les endommagements après le traitement thermique, la simulation numérique est un outil précieux. De fait, dans un procédé de traitement thermique, il y a des aspects thermiques, métallurgiques et mécaniques. Pour effectuer une simulation numérique complète, il faut établir des modèles pour ces différents aspects et identifier leurs paramètres respectifs. En particulier pour l’aspect métallurgique, il faut connaitre la cinétique de transformation du matériau étudié. Cette cinétique est donnée par les courbes de transformations isothermes (TTT, pour Time, Temperature, Transform) ou par les courbes de transformations en refroidissement continu (CCT, pour Continus Cooling Transformation). Ce papier présente une validation du modèle de Kirkaldy (Kirkaldy et al., 1979) pour définir un diagramme TTT et une validation limitée à l’aspect thermique métallurgique d’un modèle éléments finis thermomécanique métallurgique (Habraken et Bourdouxhe, 1992) qui permet de calculer un diagramme CCT à partir de la donnée du diagramme TTT. Les cas de 2 aciers sont considérés, un acier carbone-manganèse et un acier fortement allié. [less ▲]

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See detailOut-of-plane displacement derivative measurement: comparison of results obtained by a shearographic interferometer using the separation of the polarization states and the finite element method
Rosso, Vanessa; Zhang, Lihong ULg; Michel, Fabrice ULg et al

in Mathieu, P. (Ed.) Proceedings of Photonics North Conference 2006 (2006)

An original experimental setup for shearography with metrological applications is presented herein. The simplicity and the efficiency of the setup are provided by a shearing device, a prism that separates ... [more ▼]

An original experimental setup for shearography with metrological applications is presented herein. The simplicity and the efficiency of the setup are provided by a shearing device, a prism that separates the TE and TM polarization modes with a coating and a thin glass plate attached on its face. The temporal phase shifting method is applied through the use of a liquid crystal variable retarder. The use of this shearing device enables an in-line and almost-common path configuration for the shearing interferometer, a path that leads to high stability of the interferometer and a low sensitivity to external disturbances. In order to prove the efficiency and the accuracy of this speckle shearing interferometer, the out-of-plane displacement derivative relative to the shearing interferometry direction of a centrally loaded steel plate has been measured by the shearographic interferometer and then compared with the out-of-plane displacement derivative computed from the displacement field provided by the finite element method. The results are in good agreement. [less ▲]

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See detailAnalisi delle caratteristiche antropometriche e delle capacità di salto di giovani pallavolisti d'alto livello
Ciccarone, Guido; Fontani, Giuliano; Albert, Adelin ULg et al

in Medicina Dello Sport (2005), 58(1), 1-15

Aim. The volleyball is a situational sport classified among activities laying on alternative aerobe and anaerobe processes, with an important participation of the muscular mass and an accentuated ... [more ▼]

Aim. The volleyball is a situational sport classified among activities laying on alternative aerobe and anaerobe processes, with an important participation of the muscular mass and an accentuated prevalence of the alactacid anaerobe process. Within a population of young top volleyball athletes, the goal of the study was to compare several anthropometrical and functional variables according to the role of the player during the game. Methods. Data were collected by 42 volleyball players which trained with the Italian national junior team, divided into four groups: 1) side spikers (n=14; age=18.5 +/- 1.4 y.); 2) centre spikers (n=15; age 18.1 +/- 11.1 y.); (3) setters (n=7; age=18.4 +/- 1.3 y), and; 4) universal spikers (n=6; age=17.5 +/- 0.8 y.). Morphological data were height, weight, body mass index (BMI), indirect ratio of body fat determined by the method of Katch (%BF), reach with 1 (R1) or 2 (R2) hands. The explosive force was measured with the method of Bosco [1] : squat jump (SJ), counter movement jump (CMJ), CMJ with arms (CMJas) and repeated jumps during 15 seconds (RJ15). The ability to jump was measured with the Vertec test in two conditions: spike (Vertec attack, VA) and block (Vertec block, VB). Jumping performance was determined through the difference between VA and R1 (running spring, RS) and VB and R2 (standing spring, SS). Results. Significant differences were pointed out for the height (F=4,75; p < 0,006), R1 (F=3,6; p < 0,02) and R2 (F=3,66; p < 0,02). For the three anthropological variables, centre spikers (C) were significantly higher than setters (S). Comparing players' performance at the Bosco test, no significant differences appeared between groups. Results of Vertec test showed significant differences in VA (F = 7.29; p < 0.001) where group C performed better than groups S and U (universal spikers), and in VB (F = 3.95; p < 0.05) where group C achieved significantly better then setters. Analysis of the correlation matrix showed that height and weight were strongly correlated between them and with R1 and R2. Performances at Bosco test and at Vertec test were respectively correlated between them but no correlation was observed between results of Bosco and Vertec test. With Bosco test gathered information provide an assessment of the jumping ability without connection to the specific skills while Vertec test provide more specific information about the athlete's ability to use spring in specific conditions. A high correlation was identified between anthropometrics variables and the results of the Vertec test. Multiple regression analysis confirmed that, excepted %BF which is only (inversely) correlated to Vertec performances, all groups of variables were correlated between them. Conclusion. Results pointed out that in junior top level volleyball, the anthropometrical profile of the players is directly related to specific variables which must be used to select talented athletes and to plan training in connection with specific role of the player in the game. Because of the reduced duration of the game episodes and to the increasing intensity of the game rhythm, the modern volleyball involve increasingly the alactacid anaerobe component. It is for all above reasons that top level volleyball needs always more muscular powerful athletes who are also fast and able to use high jumping abilities. For that reason, assessment, training and follow up of the jumping abilities become some of the most determinant aspects of the player's effectiveness. Data underline the interest of the use of specific tests to identify the jumping ability of volleyball athletes. The protocol developed in that study can provide determinant information during the first phase of athletes' selection. [less ▲]

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See detailModelling of semi-continuous casting of cupro-nickel alloys
Pascon, Frédéric ULg; Pecquet, Etienne ULg; Zhang, Lihong ULg et al

in Papadrakakis, M.; Onate, E.; Schrefler, B. (Eds.) Proceedings of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (2005)

This research developed at University of Liege aims to optimize the complete semi-continuous casting process at LBP Company, a producer of copper-nickel alloys (or cupro-nickels). The process consists in ... [more ▼]

This research developed at University of Liege aims to optimize the complete semi-continuous casting process at LBP Company, a producer of copper-nickel alloys (or cupro-nickels). The process consists in vertical casting of 7m long ingots. Some problems recurrently occur during casting process: formation of oscillations (wave length of about 500 mm), unsuitable concave cross-sections or internal cracks. In order to reduce the occurrence of such defects and to better understand their formation, we have been asked to develop a finite element model. The research focuses on two main topics: identification of material properties through laboratory tests and literature survey and the development of the numerical tool. The laboratory tests provide thermal and mechanical properties of the ingot and the mould, as well as heat transfer coefficients between the ingot and its surroundings (mould, air and water). These parameters are required for the numerical simulations of the process. In the second part of the research, numerical calculations have been performed using finite element method. Two types of 2D models have already been studied: horizontal slice and vertical slice. This first choice has been guided by the high coupling between thermal and mechanical aspects of the problem, leading to highly complex systems of equations and subsequent long CPU times. However, due to the limitations of such 2D models, a 3D formulation has then been considered and it is still in progress. [less ▲]

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See detailCrural artery bypass with the autogenous greater saphenous vein
Van Damme, Hendrik ULg; Zhang, Lihong ULg; Baguet, E. et al

in European Journal of Vascular and Endovascular Surgery : The Official Journal of the European Society for Vascular Surgery (2003), 26(6), 635-642

Objective. To evaluate the long-term outcome of greater saphenous vein (GSV) infrapopliteal revascularisation in a single centre over a 10 year period. Material and methods. Fourty-one variables relating ... [more ▼]

Objective. To evaluate the long-term outcome of greater saphenous vein (GSV) infrapopliteal revascularisation in a single centre over a 10 year period. Material and methods. Fourty-one variables relating to a consecutive series of 90 crural artery GSV(76% in situ) bypasses in 81 patients (1990-2000) were analysed. The mean age of the 47 men and 34 women was 70 years. Limb-threatening ischaemia was present in 96% of cases, claudication in four patients. In 18 patients, surgery was 'redo'. Results. The perioperative mortality was 3% (n = 3). Patient survival was 54% at 4 years. Independent risk factors affecting survival were chronic renal insufficiency (p = 0.04), hypertension (p = 0.02), and ischaemic heart disease (p = 0.01). Four bypasses thrombosed within 30 days. Three of them could be successfully reopened. Mean follow-up was 39 months. The primary patency rate at 4 years was 80%. Chronic renal insufficiency revealed to be the single independent risk factor for graft thrombosis (p = 0.03, RR = 12.4). The 4-year limb salvage rate was 88%. No independent risk factor affecting the limb salvage could be identified. Conclusion. Crural artery revascularisation is a valuable option for the management of limb threatening infrapopliteal arterial occlusive disease. [less ▲]

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See detailPrevention de la necrose des membres inferieurs et de l'amputation par pontages femoro-tibiaux: indications, technique et resultats
Van Damme, Hendrik ULg; Baguet, E.; Zhang, Lihong ULg et al

in Revue Médicale de Liège (2003), 58(6), 415-28

Limb threatening ischemia is a challenge for the vascular surgeon. Recent progress in revascularization procedures allow to minimize the primary amputation rate in the management of chronic critical limb ... [more ▼]

Limb threatening ischemia is a challenge for the vascular surgeon. Recent progress in revascularization procedures allow to minimize the primary amputation rate in the management of chronic critical limb ischemia. The authors discuss the prevalence and causes of chronic critical limb ischemia, with a special interest for diabetic arteriopathy. The technique of crural and pedal vessel revascularization is described, as well as the innovative tourniquet technique for distal bypass surgery. A review of published series of infrapopliteal bypass surgery is made. The experience of the authors during last decade with crural and pedal bypass surgery is analyzed. [less ▲]

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See detailClinching joining system: validation of numerical models
Pietrapertosa, C.; Zhang, Lihong ULg; Habraken, Anne ULg et al

in Brucato, V. (Ed.) Proceedings of the 6th International ESAFORM Conference on Material Forming (2003)

The clinching process, also known as “press joining”, is a mechanical joining technique for sheet metal. Its basic principle is to clamp together several metal sheets by an impact extrusion between a ... [more ▼]

The clinching process, also known as “press joining”, is a mechanical joining technique for sheet metal. Its basic principle is to clamp together several metal sheets by an impact extrusion between a punch and a die. The joint is formed by a localized cold plastic deformation. Forming is used as a joining method. Within the context of this research, University of Liège is developing numerical models, with the FEM code LAGAMINE, that simulate the clinching process. On the other hand, shear tests on simple joints with one or two clinches were realized and their behaviour is reproduced numerically with LAGAMINE. This work opens the way to the analytical formulation of the behaviour of clinched joints. The article will focus on comparisons between experiments and numerical simulations. First, the identification of model parameters will be explained. Then, the predicted failure modes will be analysed by comparison with the xperiments. [less ▲]

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See detailNumerical Modelling of the Forging Process of Rolls for Rolling Mills
Castagne, S.; Charles; Habraken, Anne ULg et al

in Proceedings of the 2nd International Conference on forging and related technology (2000, April)

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See detailA new elastic-visco-plastic damage model for annealed aluminium: theory, calibration and validation
Habraken, Anne ULg; Zhang, Lihong ULg; Wang, X. C. et al

in Benallal, A. (Ed.) Proceedings of the Continuous Damage and Fracture Symposium (2000)

This article describes an energy based, two variables, isotropic damage model merged with Bodner's elasto-visco-plastic model and implemented in a non-linear finite element code. The procedure to identify ... [more ▼]

This article describes an energy based, two variables, isotropic damage model merged with Bodner's elasto-visco-plastic model and implemented in a non-linear finite element code. The procedure to identify the parameters of the model and its experimental validation are presented and applied to an annealed aluminium. [less ▲]

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See detailNumerical modelling of the forging process of rolls for rolling mills
Charles, J.-F.; Castagne, Sylvie; Zhang, Lihong ULg et al

in Pietrzyk, M.; Kusiak, J.; Majta, J. (Eds.) et al Proceedings of the 8th International Conference on Metal Forming (2000)

This article presents comparisons of forging processes between two flat tools, between two round tools, and at different forging temperatures. Simulation results help to recover and better understa,d long ... [more ▼]

This article presents comparisons of forging processes between two flat tools, between two round tools, and at different forging temperatures. Simulation results help to recover and better understa,d long practice in the forging industry. [less ▲]

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See detailNumerical modelling of the forging process of rolls for rolling mills
Charles, J. F.; Castagne, S.; Zhang, Lihong ULg et al

in Proceedings of the 5ème Congrès national belge, Mecanique théorique et appliquée (2000)

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See detailAn efficient method for the regeneration of wheat (Triticum aestivum) from anther cultures.
Zhang, Lihong ULg; Anceau, Christine ULg; Lepoivre, Philippe ULg et al

in Bulletin des Recherches Agronomiques de Gembloux (1987), 22(4),

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