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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics最新文献

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Étude expérimentale et numérique de la convection thermomagnétique dans un fluide non électroconducteur 非导电流体热磁对流的实验与数值研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-05-01 Epub Date: 2001-06-08 DOI: 10.1016/S1620-7742(01)01339-3
Fouad Khaldi, Pascale Gillon
{"title":"Étude expérimentale et numérique de la convection thermomagnétique dans un fluide non électroconducteur","authors":"Fouad Khaldi,&nbsp;Pascale Gillon","doi":"10.1016/S1620-7742(01)01339-3","DOIUrl":"10.1016/S1620-7742(01)01339-3","url":null,"abstract":"<div><p>We present an experimental and numerical study of convection driven by a central heat source in a vertical and cylindrical cavity with a higth aspect ration, filled by air and submitted to the action of non homogeneous intence magnetic field. We show how the magnetization force applying on oxygene is able to intensify, reduce, stop or even reverse the natural convection fluid flow.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 5","pages":"Pages 357-362"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01339-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80302893","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: 3
Séparation et reconstruction des ondes dans les barres élastiques et viscoélastiques à partir de mesures redondantes 从冗余测量中分离和重建弹性和粘弹性棒中的波
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-05-01 Epub Date: 2001-06-08 DOI: 10.1016/S1620-7742(01)01343-5
Ramzi Othman , Marie-Noëlle Bussac , Pierre Collet , Gérard Gary
{"title":"Séparation et reconstruction des ondes dans les barres élastiques et viscoélastiques à partir de mesures redondantes","authors":"Ramzi Othman ,&nbsp;Marie-Noëlle Bussac ,&nbsp;Pierre Collet ,&nbsp;Gérard Gary","doi":"10.1016/S1620-7742(01)01343-5","DOIUrl":"10.1016/S1620-7742(01)01343-5","url":null,"abstract":"<div><p>When using a classical SHPB (Split Hopkinson Pressure Bar) set-up, the useful measuring time is limited by the need of separating the waves propagating in opposite directions. A new method for separating and rebuilding waves in finite bars was developed, with no time limit, from <span><math><mtext>N</mtext></math></span> strain measurements and <span><math><mtext>P</mtext></math></span> particle velocity measurements <span><math><mtext>(N+P⩾2)</mtext></math></span>. It takes account of the wave dispersion in elastic and viscoelastic bars. The method is illustrated with the loading of a free bar where the measured displacement is 30 times longer than the displacement that would be obtained with the classical method.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 5","pages":"Pages 369-376"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01343-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79548960","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: 16
Mise en évidence et quantification des couplages thermomécaniques réversibles et irréversibles dans les bétons sains et endommagés par des cycles gel-dégel 确定和量化受冻融循环影响的健康和受损混凝土中可逆和不可逆热机械耦合
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-05-01 Epub Date: 2001-06-08 DOI: 10.1016/S1620-7742(01)01341-1
Vincent Huon, Bruno Cousin, Olivier Maisonneuve
{"title":"Mise en évidence et quantification des couplages thermomécaniques réversibles et irréversibles dans les bétons sains et endommagés par des cycles gel-dégel","authors":"Vincent Huon,&nbsp;Bruno Cousin,&nbsp;Olivier Maisonneuve","doi":"10.1016/S1620-7742(01)01341-1","DOIUrl":"https://doi.org/10.1016/S1620-7742(01)01341-1","url":null,"abstract":"<div><p>We study thermal phenomena which occur during compressive loading tests on some damaged or not concrete. Two calorific effects are shown through an experimental study using infrared thermography. The first, intrinsically reversible, is due to the thermoelastic coupling. The second is due to damage concrete state.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 5","pages":"Pages 331-335"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01341-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90000151","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: 2
Naissance des corrélations triples de vorticité dans une turbulence statistiquement homogène soumise à une rotation 在受旋转影响的统计均匀湍流中产生三重涡度相关性
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-05-01 Epub Date: 2001-06-08 DOI: 10.1016/S1620-7742(01)01338-1
Jean-Noël Gence, Christine Frick
{"title":"Naissance des corrélations triples de vorticité dans une turbulence statistiquement homogène soumise à une rotation","authors":"Jean-Noël Gence,&nbsp;Christine Frick","doi":"10.1016/S1620-7742(01)01338-1","DOIUrl":"10.1016/S1620-7742(01)01338-1","url":null,"abstract":"<div><p>A homogeneous and isotropic turbulence is suddenly subjected to a rigid body rotation, whose influence on the turbulent vorticity field is studied. It is shown that only the odd statistical moments are influenced by the rotation at the first order in time. This effect is shown in particular for triple correlations and should be more important for a small Rossby number.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 5","pages":"Pages 351-356"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01338-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91218481","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: 22
Sur la nature de la transition à l'instationnaire d'un écoulement de convection naturelle en cavité différentiellement chauffée à grands écarts de température 在大温差差的空腔中，自然对流流向稳态过渡的性质
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-05-01 Epub Date: 2001-06-08 DOI: 10.1016/S1620-7742(01)01330-7
Catherine Weisman, Laurent Calsyn, Christophe Dubois, Patrick Le Quéré
{"title":"Sur la nature de la transition à l'instationnaire d'un écoulement de convection naturelle en cavité différentiellement chauffée à grands écarts de température","authors":"Catherine Weisman,&nbsp;Laurent Calsyn,&nbsp;Christophe Dubois,&nbsp;Patrick Le Quéré","doi":"10.1016/S1620-7742(01)01330-7","DOIUrl":"10.1016/S1620-7742(01)01330-7","url":null,"abstract":"<div><p>Natural convection of air inside a rectangular cavity, differentially heated under large temperature gradients, is considered. The low Mach approximation equations are those obtained by Paolucci allowing for filtering of sound waves. Transition to unsteadiness is studied with numerical simulation, with a finite volume code based on a fractional time step method derived from projection methods used for incompressible flows. When the fluid physical properties are prescribed constants, transition to unsteadiness follows the classical scheme of a Hopf bifurcation. The transition is quite different when viscosity obeys Sutherland's law while the Prandtl number is kept constant. There is evidence of hysteresis, therefore the transition seems to be subcritical. In the vicinity of the transition, on the large amplitude branch, an intermittent solution is observed, with periodic bursts separating quasi-steady states.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 5","pages":"Pages 343-350"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01330-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82010227","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: 10
Configurations polygonales en équilibre relatif 相对平衡下的多边形结构
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-04-01 Epub Date: 2001-05-22 DOI: 10.1016/S1620-7742(01)01334-4
Dominique Bang, Badaoui Elmabsout
{"title":"Configurations polygonales en équilibre relatif","authors":"Dominique Bang,&nbsp;Badaoui Elmabsout","doi":"10.1016/S1620-7742(01)01334-4","DOIUrl":"10.1016/S1620-7742(01)01334-4","url":null,"abstract":"<div><p>We consider the <span><math><mtext>N</mtext></math></span>-body (<span><math><mtext>N=p·n</mtext></math></span>) problem (where the bodies are submitted to their mutual attractions derived from a potential of the type <span><math><mtext>V(r)=Cte/r</mtext><msup><mi></mi><mn>2α</mn></msup></math></span> where <span><math><mtext>0⩽α&lt;∞</mtext></math></span>). We prove the existence of relative equilibrium configurations (denoted C.E.R.) when the ponctual bodies are at the vertices of <span><math><mtext>p</mtext></math></span> regular polygons centered around a given mass <span><math><mtext>M</mtext></math></span>, the masses being equal on the vertices of each polygon. In the Newtonian case (<span><math><mtext>α=1/2</mtext></math></span>) we enrich the last result for values of n lower or equal than <span><math><mtext>472</mtext></math></span>.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 4","pages":"Pages 243-248"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01334-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78928923","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: 13
Propagation of singularities along a characteristic boundary for a model problem of shell theory and relation with the boundary layer 壳理论模型问题特征边界上奇点的传播及其与边界层的关系
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-04-01 Epub Date: 2001-05-22 DOI: 10.1016/S1620-7742(01)01324-1
Évariste Sanchez-Palencia
{"title":"Propagation of singularities along a characteristic boundary for a model problem of shell theory and relation with the boundary layer","authors":"Évariste Sanchez-Palencia","doi":"10.1016/S1620-7742(01)01324-1","DOIUrl":"10.1016/S1620-7742(01)01324-1","url":null,"abstract":"<div><p>We consider the propagation of singularities for a differential system which constitutes a simplified model of thin shells with developable middle surface (parabolic case). Extensions of the solutions out of the domain allow us to consider either boundary or internal singularities. The properties of propagation of singularities and their relation with the structure of the boundary layers are given. We remove a mistake in [2], Section 6.1, concerning the analyticity of solutions (in fact they are in the Gevrey class of order 3).</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 4","pages":"Pages 249-254"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01324-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89944319","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: 2
Points singuliers d'une ligne de contact mobile
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-04-01 Epub Date: 2001-05-22 DOI: 10.1016/S1620-7742(01)01335-6
Martine Ben Amar , Linda Cummings , Yves Pomeau
{"title":"Points singuliers d'une ligne de contact mobile","authors":"Martine Ben Amar ,&nbsp;Linda Cummings ,&nbsp;Yves Pomeau","doi":"10.1016/S1620-7742(01)01335-6","DOIUrl":"10.1016/S1620-7742(01)01335-6","url":null,"abstract":"<div><p>It is proposed to represent the dynamics of a moving contact line by an Onsager like mobility relation between the contact angle and the speed of the moving line, including an Arrhenius factor small enough in many physical situations to be the limiting factor for the motion. The liquid-vapor interface is then in quasiequilibrium, which allows one to analyse a dynamical wetting transition. This approach predicts well the formation of angular points on the rear edge of droplets sliding on a tilted plane.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 4","pages":"Pages 277-282"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01335-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78610608","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: 8
Analyse mécanique par une méthode hybride du comportement d'un matériau revêtu sollicité en fretting 用混合方法分析涂层材料在摩擦作用下的力学行为
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-04-01 Epub Date: 2001-05-22 DOI: 10.1016/S1620-7742(01)01320-4
Isabelle Caron , Jean-Michel De Monicault , Robert Progri , Geneviève Inglebert
{"title":"Analyse mécanique par une méthode hybride du comportement d'un matériau revêtu sollicité en fretting","authors":"Isabelle Caron ,&nbsp;Jean-Michel De Monicault ,&nbsp;Robert Progri ,&nbsp;Geneviève Inglebert","doi":"10.1016/S1620-7742(01)01320-4","DOIUrl":"10.1016/S1620-7742(01)01320-4","url":null,"abstract":"<div><p>The present note describes the process settled for analysis of coated contacts submitted either to a normal load or a tangential one. This hybrid method uses a Finite Element Method in addition to the experimental results. Effects of a soft coating and a hard layer are studied on elastic contact parameters (F.E.M.), and on the resistance to fretting fatigue (experimentation + F.E.M.). The use of Dang Van criterion allows us to determine the crack initiation threshold.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 4","pages":"Pages 263-269"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01320-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84078637","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: 0
Similarity solution of a penny-shaped fluid-driven fracture in a zero-toughness linear elastic solid 零韧性线弹性固体中硬币型流体驱动裂缝的相似解
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-04-01 Epub Date: 2001-05-22 DOI: 10.1016/S1620-7742(01)01323-X
Alexei Savitski, Emmanuel Detournay
{"title":"Similarity solution of a penny-shaped fluid-driven fracture in a zero-toughness linear elastic solid","authors":"Alexei Savitski,&nbsp;Emmanuel Detournay","doi":"10.1016/S1620-7742(01)01323-X","DOIUrl":"10.1016/S1620-7742(01)01323-X","url":null,"abstract":"<div><p>This note deals with the problem of a penny-shaped hydraulic fracture propagating in an impermeable elastic solid. Growth of the fracture is driven by injection of an incompressible Newtonian fluid at the center of the fracture. The solution is restricted to the so-called viscosity-dominated regime where it can be assumed that the solid has zero toughness. The paper describes the construction of a semi-analytical similarity solution, which incorporates the known singularity of the fluid pressure at the center of the fracture and at the tip and which is based on series expansions of the fracture opening and fluid pressure in terms of Jacobi polynomials.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 4","pages":"Pages 255-262"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01323-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77767275","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: 10
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