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

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Mesures rhéologiques sur matériaux en cours de prise 正在进行的材料流变学测量
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00116-2
Laurent Arnaud, Géraldine Villain, Claude Boutin
{"title":"Mesures rhéologiques sur matériaux en cours de prise","authors":"Laurent Arnaud,&nbsp;Géraldine Villain,&nbsp;Claude Boutin","doi":"10.1016/S1287-4620(00)00116-2","DOIUrl":"10.1016/S1287-4620(00)00116-2","url":null,"abstract":"<div><p>An experimental device enabling to study the rheological behaviour of setting heterogeneous materials is first presented. Measurements are achieved by means of vibration tests using acoustic waves at low frequency (100 Hz–1 kHz). The results are presented for different mixtures of water-granulates-binders and gas bubbles: mortar and cellular concrete (different formulations). From the measurements of celerity and damping coefficients, various analyses led to quantify the evolution of the complex œdometric modulus of the material and the viscoelastic modulus of the interbubble matrix.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 217-223"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00116-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75706562","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: 4
Simulation des phases de fonctionnement transitoires d'un moteur diesel semi-rapide à suralimentation séquentielle 半快顺序增压柴油机瞬态运行阶段的模拟
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00122-8
Pascal Chessé , Xavier Tauzia , Jean-François Hetet , Gérald Grosshans
{"title":"Simulation des phases de fonctionnement transitoires d'un moteur diesel semi-rapide à suralimentation séquentielle","authors":"Pascal Chessé ,&nbsp;Xavier Tauzia ,&nbsp;Jean-François Hetet ,&nbsp;Gérald Grosshans","doi":"10.1016/S1287-4620(00)00122-8","DOIUrl":"10.1016/S1287-4620(00)00122-8","url":null,"abstract":"<div><p>The Selendia simulation software dedicated for diesel engines is presented. Based on the filling and emptying method, it calculates the evolution of the engine and turbocharger rotation speed and the temperature and the pressure in different control volumes (manifolds, cylinders) during the dynamic operations of the engine. Its application to a sequentially turbocharged engine leads to the optimisation of the turbocharging system characteristics such as the time lag between the opening of the air and gas valves. Its predictive capacities permit to test by simulation the performances of a new engine and then to guide the engine designers.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 193-198"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00122-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73013272","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: 1
Optimizing a compositionally graded interlayer to reduce thermal stresses in a coated tube 优化成分梯度间层以降低涂层管中的热应力
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00118-6
Djaffar Boussaa
{"title":"Optimizing a compositionally graded interlayer to reduce thermal stresses in a coated tube","authors":"Djaffar Boussaa","doi":"10.1016/S1287-4620(00)00118-6","DOIUrl":"10.1016/S1287-4620(00)00118-6","url":null,"abstract":"<div><p>We investigate the problem of optimizing the composition profile of a functionally graded interlayer inserted between a metallic tube and a ceramic coating so as to alleviate the thermal stresses occurring at the metal–ceramic interface. The optimization problem is set in the framework of optimal control and discretized using the direct transcription method. An application of the proposed approach shows (1) that as expected, functionally graded materials can be effective stress relievers by allowing gradual transitions between dissimilar materials and (2) that a stress-minimizer transition is not necessarily continuous.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 209-215"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00118-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84559264","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: 6
Modèle à deux échelles de l'équation des ondes à coefficients oscillants 振荡系数波方程的两尺度模型
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00133-2
Michel Lenczner , Mahamane Kader , Pierre Perrier
{"title":"Modèle à deux échelles de l'équation des ondes à coefficients oscillants","authors":"Michel Lenczner ,&nbsp;Mahamane Kader ,&nbsp;Pierre Perrier","doi":"10.1016/S1287-4620(00)00133-2","DOIUrl":"10.1016/S1287-4620(00)00133-2","url":null,"abstract":"<div><p>A two-scale model for the wave equation with periodic coefficients is formulated. It has been derived using an asymptotic method based on a two-scale convergence and on the Bloch waves decomposition. The homogenized wave equation and the Bloch waves expansion are particular cases of this new formulation.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 335-340"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00133-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85485912","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
On the heterogeneous behaviour in a 2D fluidized bed 二维流化床的非均质特性研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00136-8
Eivind Helland, René Occelli, Lounès Tadrist
{"title":"On the heterogeneous behaviour in a 2D fluidized bed","authors":"Eivind Helland,&nbsp;René Occelli,&nbsp;Lounès Tadrist","doi":"10.1016/S1287-4620(00)00136-8","DOIUrl":"10.1016/S1287-4620(00)00136-8","url":null,"abstract":"<div><p>The aim of the present paper is to study the influence of the <em>n</em> -index in the porosity function of Richardson–Zaki on the heterogeneous behaviour in a fluidized bed. This parameter takes into account the group effect of particles on the drag of an isolated particle. We have shown up different behaviours of the bed when changing its value.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 359-365"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00136-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85542709","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: 1
Mechanics of planar beams focusing on buckling phenomena 聚焦于屈曲现象的平面梁力学
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00126-5
Massimo Magno , Jean François Ganghoffer
{"title":"Mechanics of planar beams focusing on buckling phenomena","authors":"Massimo Magno ,&nbsp;Jean François Ganghoffer","doi":"10.1016/S1287-4620(00)00126-5","DOIUrl":"10.1016/S1287-4620(00)00126-5","url":null,"abstract":"<div><p>A methodology for the analysis of the mechanical behaviour of beams is presented, which relies on the lemma of stroboscopy. This problem traces back to Euler's work. Starting from a discrete model of the shape of the beam, stroboscopy enables us to built a continuous model for the variation of the angular position along the corrugated beam. The angular position is characterised as the solution of a differential equation. The main originality of the work is the study of buckling conditions of corrugated beams.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 283-288"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00126-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79586405","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: 1
Structure double diffusive des équations de la convection en air humide saturé avec application à l'air nuageux 饱和湿空气对流方程的双扩散结构，适用于多云空气
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00129-0
Agnès Kubicki, Pierre-Antoine Bois
{"title":"Structure double diffusive des équations de la convection en air humide saturé avec application à l'air nuageux","authors":"Agnès Kubicki,&nbsp;Pierre-Antoine Bois","doi":"10.1016/S1287-4620(00)00129-0","DOIUrl":"10.1016/S1287-4620(00)00129-0","url":null,"abstract":"<div><p>The ternary mixture `dry air–water vapor–liquid water' is a statically stable medium in general. This property is a consequence of the great number of physical properties of the medium, such as double diffusivity, heterogeneous medium equation of state, and equilibrium of saturation. Convective instability in that medium can be modelled with the help of a Rayleigh number <em>Ra</em> and a moist Rayleigh number <em>Rh</em> . In this paper, we establish necessary conditions for appearance of the instability for a given static distribution of temperature and water vapor concentration, with respect to physical characteristics of the medium. In particular, regimes of stationary instability (`moisture fingers') can exist, even if the dry medium is statically stable.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 317-322"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00129-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73210740","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: 1
About frequency coupling between riser and plenum in a gas fluidized bed 气体流化床中立管与静压室的频率耦合
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00128-9
Christophe Sierra, Lounès Tadrist
{"title":"About frequency coupling between riser and plenum in a gas fluidized bed","authors":"Christophe Sierra,&nbsp;Lounès Tadrist","doi":"10.1016/S1287-4620(00)00128-9","DOIUrl":"10.1016/S1287-4620(00)00128-9","url":null,"abstract":"<div><p>This article deals with the explanation of pressure fluctuations coupling between riser and plenum in a gas fluidized bed. It has been noticed by former experiments that the pressure fluctuations taking place in the riser due to bubbles eruptions is also observed underneath the distributor, in the plenum (also called windbow) under certain conditions. In order to explain how effective is the coupling depending on the bed and air distributor design but also on the flow characteristics, we have developped a simple model associated to an experiment presented hereunder.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 323-328"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00128-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83418969","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: 9
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00119-8
Huy Duong Bui, Andrei Constantinescu, Hubert Maigre
{"title":"","authors":"Huy Duong Bui,&nbsp;Andrei Constantinescu,&nbsp;Hubert Maigre","doi":"10.1016/S1287-4620(00)00119-8","DOIUrl":"https://doi.org/10.1016/S1287-4620(00)00119-8","url":null,"abstract":"","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Page 289"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00119-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136437665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stabilité du délaminage dans l'assemblage à double recouvrement 双重叠装配中分层的稳定性
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00135-6
Pierre de Montleau, Alain Rigolot
{"title":"Stabilité du délaminage dans l'assemblage à double recouvrement","authors":"Pierre de Montleau,&nbsp;Alain Rigolot","doi":"10.1016/S1287-4620(00)00135-6","DOIUrl":"10.1016/S1287-4620(00)00135-6","url":null,"abstract":"<div><p>The double overlap joint subjected to tensile loading is a well-known experimental setup. Within the brittle fracture mechanics, rewritten for a simplified model of adhesively bonded joint, we calculate the energy release rate for delamination and we deduce a parametric study for three configurations given by the asymptotic analysis.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 291-296"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00135-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88847949","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
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