Mecanique & Industries最新文献_第4页

Étude expérimentale de la dynamique d’endommagement microscopique accompagnant la rupture dynamique du PMMA 伴随PMMA动态断裂的微观损伤动力学的实验研究

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011116

Claudia Guerra, J. Scheibert, D. Bonamy, Davy Dalmas

引用次数: 0

Effets des défauts de soudure aluminothermique sur le comportement mécanique des rails 铝热剂焊接缺陷对钢轨力学性能的影响

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011119

Ilias Mouallif, Abdelkrim Chouaf, A. Amri, A. Benali

{"title":"Effets des défauts de soudure aluminothermique sur le comportement mécanique des rails","authors":"Ilias Mouallif, Abdelkrim Chouaf, A. Amri, A. Benali","doi":"10.1051/MECA/2011119","DOIUrl":"https://doi.org/10.1051/MECA/2011119","url":null,"abstract":"L’assemblage des rails de chemin de fer se fait generalement a travers un procede de soudage par aluminothermie. Ce procede consiste en la coulee de metal de jonction entre les deux extremites de rails a assembler. La qualite de cet assemblage depend etroitement des conditions de la realisation qui sont generalement difficiles a respecter. En effet, les techniques classiques de controle des rails, mettent souvent, en evidence la presence des defauts de soudure dans la jonction. Selon les observations, ces defauts peuvent etre classes en deux types : defauts d’adhesion (ou defauts de collage) et defauts de porosite (ou defauts de soufflures multiples). Chacun de ces defauts, peut constituer un site privilegie de concentration des contraintes. Selon le niveau de ces contraintes, des eventuels processus d’endommagement risquent de se developper et mettant le rail hors service. Il semble donc necessaire de modeliser le comportement mecanique de ces soudures avec ces defauts en vue de les classer par leur criticite. Dans cette etude, nous avons donc modelise avec un meme chargement et avec les memes conditions aux limites, la jonction de soudure pour chaque type de defaut. Les resultats obtenus sont tres concluants et permettent de bien orienter l’approfondissement de notre analyse cote parametres de soudage.","PeriodicalId":49847,"journal":{"name":"Mecanique & Industries","volume":"75 12","pages":"343-351"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/MECA/2011119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72371300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Clearance and lubricant selection for avoiding seizure in a circumferential groove journal bearing based on a lumped model analysis 基于集总模型分析的周向槽滑动轴承的间隙和润滑剂选择

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011135

Alex-Florian Cristea, M. Pascovici, M. Fillon

{"title":"Clearance and lubricant selection for avoiding seizure in a circumferential groove journal bearing based on a lumped model analysis","authors":"Alex-Florian Cristea, M. Pascovici, M. Fillon","doi":"10.1051/MECA/2011135","DOIUrl":"https://doi.org/10.1051/MECA/2011135","url":null,"abstract":"This study presents a new simple lumped model for analyzing the thermally induced seizure of fully lubricated eccentric circumferential groove journal bearings (CGJB). The model represents a significant upgrade of a previous seizure lumped model developed by Pascovici & Kucinschi, in 2002. Main upgrades consist of: eccentric operation, introduction of hydrodynamic lubricant flow rate component, and evaluation of friction power losses based on the short bearing theory with Barwell’s hypothesis on the divergent zone. The viscosity–temperature variation is replaced with Tipei’s viscosity-clearance relationship, as in the previous model. The decrease of viscosity, as a consequence of temperature increase, does not always limit clearance loss, and the seizure process ends with a concentric journal-bushing merged system. Although CGJB’s are less sensitive to this seizure mechanism, the threat still exists and must be avoided. As a result, bearing designers and users should check whether if several safe-operation criteria are met. A recent Institute Pprime experiment on CGJB’s provided a base set of operating parameters, from which numerical simulations have been performed to determine in what conditions the CGJB fails, under thermally induced seizure.","PeriodicalId":49847,"journal":{"name":"Mecanique & Industries","volume":"32 1","pages":"399-408"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74880940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Thermohydrodynamic behaviors of finite journal bearings with cavitation 含气蚀有限滑动轴承的热流体动力学行为

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011002

A. A. Solghar, S. G. Nassab

引用次数: 12

A study about energy consumption and cutting fluid used to clutch case machining 离合器箱加工能耗及切削液的研究

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011133

Henri-François Boyer, Jeremy Waremme, Jean-Luc Bourdiol, D. Delaunay

引用次数: 9

Modeling and prediction of a simplified seizure mechanism occurring in conrod bearings 连杆轴承中发生的一种简化的卡住机制的建模和预测

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011101

J. Ligier, Laurent Dutfoy

引用次数: 6

Development of experimental and modelling tools for the characterisation of the thermo-electro-mechanical behaviour of composite materials for aircraft applications 开发用于飞机应用的复合材料的热-电-机械行为表征的实验和建模工具

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011012

M. Gigliotti, M. Lafarie-Frenot, J. Grandidier

{"title":"Development of experimental and modelling tools for the characterisation of the thermo-electro-mechanical behaviour of composite materials for aircraft applications","authors":"M. Gigliotti, M. Lafarie-Frenot, J. Grandidier","doi":"10.1051/MECA/2011012","DOIUrl":"https://doi.org/10.1051/MECA/2011012","url":null,"abstract":"The present paper is concerned with the thermoelectric behaviour of CFRP composite samples subjected to DC currents in view of developing experimental and modelling tools for the characterisation of the thermo-electro-mechanical behaviour of composite materials for aircraft applications. DC currents up to 8 A are injected through the specimens end sides by employing several different electrode techniques whose performances are assessed and compared. Sample and electrode contact resistances are measured for different values of the injected current. The transient and permanent temperatures fields promoted by the injected currents are experimentally measured by infrared thermography. The temperature fields are simulated numerically by a thermoelectric coupled model employing the ABAQUS ® FE commercial code; temperatures can be also approximately calculated by a simple lumped parameter model discarding thermal conduction. The comparison between simulations by the models and measurements allows employing the simplified model as a tool to design thermo-electro-mechanical tests.","PeriodicalId":49847,"journal":{"name":"Mecanique & Industries","volume":"44 1","pages":"87-101"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82763077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Simulation numérique de l’écoulement laminaire induit dans des cuves agitées générées par les mobiles de proximité de type mono et double vis à profils simple et modifié 单螺杆和双螺杆近距离移动器在搅拌槽中诱导的层流的数值模拟，具有简单和改进的轮廓

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011011

Zied Driss, Ghazi Bouzgarrou, Hédi Kchaou, M. Abid

{"title":"Simulation numérique de l’écoulement laminaire induit dans des cuves agitées générées par les mobiles de proximité de type mono et double vis à profils simple et modifié","authors":"Zied Driss, Ghazi Bouzgarrou, Hédi Kchaou, M. Abid","doi":"10.1051/MECA/2011011","DOIUrl":"https://doi.org/10.1051/MECA/2011011","url":null,"abstract":"Dans cet article, une etude comparative entre les caracteristiques hydrodynamiques de l’ecoulement laminaire genere en cuves agitees par differents mobiles de proximite de type mono et double vis avec profils simple et modifie a ete menee en utilisant la simulation numerique. Cette etude a ete abordee a l’aide d’un code specifique de dynamique des fluides numerique (CFD), base sur la resolution des equations de Navier-Stokes par la methode des volumes finis. Les resultats numeriques obtenus montrent bien l’influence de la forme du mobile d’agitation sur le comportement de l’ecoulement au sein de la cuve. En effet, on remarque que l’utilisation d’une vis a profil modifie favorise un champ de vitesse plus actif que dans le cas des configurations a profil simple. Par ailleurs, et dans le cas d’une double vis, on note que l’effet de la dissipation visqueuse et du pompage est nettement plus preponderant, presentant ainsi une meilleure efficacite de pompage et de consommation energetique. La comparaison de nos resultats numeriques avec les resultats experimentaux tires de la litterature montre une bonne adequation, ce qui prouve la validite de la methode d’analyse adoptee.","PeriodicalId":49847,"journal":{"name":"Mecanique & Industries","volume":"17 1","pages":"109-121"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79058295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Étude numérique du comportement en fatigue à grand nombre de cycles d’agrégats polycristallins de cuivre 多晶铜集料高循环疲劳行为的数值研究

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011109

C. Robert, N. Saintier, T. Palin-Luc, F. Morel

引用次数: 1

Dynamique de mousses poroélastiques 孔隙弹性泡沫动力学

Mecanique & Industries Pub Date : 2011-01-01 DOI: 10.1051/MECA/2011115

Benjamin Sobac, M. Colombani, Yoël Forterre

引用次数: 4