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

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Un modèle membranaire de coques faiblement courbées valable pour des charges élevées 低弯曲壳膜模型适用于高负荷
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-12-01 DOI: 10.1016/S1287-4620(99)90002-9
Khalid Elamri, Aziz Hamdouni, Alain Cimetiere
{"title":"Un modèle membranaire de coques faiblement courbées valable pour des charges élevées","authors":"Khalid Elamri,&nbsp;Aziz Hamdouni,&nbsp;Alain Cimetiere","doi":"10.1016/S1287-4620(99)90002-9","DOIUrl":"10.1016/S1287-4620(99)90002-9","url":null,"abstract":"<div><p>In this paper, we present the construction of a membrane model for shallow shells using asymptotic approach. This model is valid for important applied loads where the tangential part is supposed to be more important than the normal part. To our knowledge, this membrane model obtained from three-dimensional elasticity, does not exist in the literature. Although it is nonlinear, it resolution can be split into two linear problems.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 13","pages":"Pages 1281-1284"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(99)90002-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77849338","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
Critère d'initiation de délaminage dans les stratifiés 层压板开始分层的标准
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-12-01 DOI: 10.1016/S1287-4620(99)90004-2
Jean-François Caron, Rui Pedro Carreira, Alberto Diaz Diaz
{"title":"Critère d'initiation de délaminage dans les stratifiés","authors":"Jean-François Caron,&nbsp;Rui Pedro Carreira,&nbsp;Alberto Diaz Diaz","doi":"10.1016/S1287-4620(99)90004-2","DOIUrl":"10.1016/S1287-4620(99)90004-2","url":null,"abstract":"<div><p>A criterion is proposed to predict delamination initiation in angle-ply laminates. An analytical model permits to calculate interface stresses between two layers in any laminate. The criterion is based on the maximum value of these stresses and takes into account the scale effects (number of layers). The numerical results are validated by a comparison with experimental data.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 13","pages":"Pages 1291-1296"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(99)90004-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81492785","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
Géométrie de l'intermittence en turbulence développée 湍流中间歇的几何形状
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-12-01 DOI: 10.1016/S1287-4620(00)87509-2
Diogo Queiros-Condé
{"title":"Géométrie de l'intermittence en turbulence développée","authors":"Diogo Queiros-Condé","doi":"10.1016/S1287-4620(00)87509-2","DOIUrl":"10.1016/S1287-4620(00)87509-2","url":null,"abstract":"<div><p>A geometrical interpretation of intermittency in fully developed turbulence is realized through an hierarchy of fractal structures Ω<sub>p</sub> of dimensions <em>Δ</em><sub>p</sub> linked each other by the relations Ω<sub>p + <em>1</em></sub> − Ω<sub>p</sub> (i.e. <em>Δ</em><sub>p + <em>1</em></sub> &lt; <em>Δ</em><sub>p</sub>) and γ = (<em>Δ</em><sub>p + 1</sub> − <em>Δ<sub>∞</sub></em>)/(<em>Δ</em><sub>p</sub> − <em>Δ<sub>∞</sub></em>) with γ = <em>((1 + 3/√8)<sup>1/3</sup> + (1 − 3/√8)<sup>1/3</sup>)<sup>3</sup></em> and <em>Δ<sub>∞</sub> = 1</em> and <em>Δ<sub>∞</sub> = 1</em>. This is obtained by the introduction of an entropy jump, defined at the scale r, <em>Δ</em>S<sub>p</sub>(r) = (<em>Δ</em><sub>p + <em>1</em></sub> − <em>Δ</em><sub>p</sub>) <em>ln</em> (r/r<sub><em>0</em></sub>) characterizing the order level of each sub-structure Ω<sub>p</sub> and verifying a linear relation <em>Δ</em>S<sub>p</sub>(r) = γ <em>Δ</em>S<sub>p − <em>1</em></sub>(r).</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 14","pages":"Pages 1385-1390"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)87509-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89553255","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
Un modèle général de double porosité 双孔隙度的一般模型
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88648-2
Alain Bourgeat , Maria Goncharenko , Michel Panfilov , Leonid Pankratov
{"title":"Un modèle général de double porosité","authors":"Alain Bourgeat ,&nbsp;Maria Goncharenko ,&nbsp;Michel Panfilov ,&nbsp;Leonid Pankratov","doi":"10.1016/S1287-4620(00)88648-2","DOIUrl":"10.1016/S1287-4620(00)88648-2","url":null,"abstract":"<div><p>We consider a parabolic equation with highly contrasted diffusion coefficients in the blocks set ℳ<sup>(ɛ)</sup> and in the surrounding fissures system ℱ<sup>(ɛ)</sup>. Without a assumption, for a large range of contrast and by mean of variational homogenization, we find the global behavior when the numbers of blocks tends to infinity, for both the non stationary and the stationary model.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1245-1250"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88648-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83758247","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
Diffraction entre un émetteur et un récepteur localement toriques. Application à l'étude des systèmes astigmates 局部环形发射器和接收器之间的衍射。在散光系统研究中的应用
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88652-4
Pierre Pellat-Finet
{"title":"Diffraction entre un émetteur et un récepteur localement toriques. Application à l'étude des systèmes astigmates","authors":"Pierre Pellat-Finet","doi":"10.1016/S1287-4620(00)88652-4","DOIUrl":"10.1016/S1287-4620(00)88652-4","url":null,"abstract":"<div><p>The transfer of the electromagnetic field from a toric emitter to a receiver of same kind is expressed by a two-dimensional integral which can be split into two one-dimensional integrals. Each one-dimensional integral can be seen as a fractionnal Fourier transform whose order is related to the distance between the emitter and the receiver and to their principal curvatures. The knowledge of these orders is alone sufficient to solve practical problems (such as image formation) without explicit use of the integral formulae.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1269-1274"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88652-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78955091","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
Modélisation du flot urinaire dans l'uretère chez l'Homme 人类输尿管尿流的模型
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88651-2
Daniel Gintz , Badaoui Elmabsout , Jean-Pierre Renaudeaux
{"title":"Modélisation du flot urinaire dans l'uretère chez l'Homme","authors":"Daniel Gintz ,&nbsp;Badaoui Elmabsout ,&nbsp;Jean-Pierre Renaudeaux","doi":"10.1016/S1287-4620(00)88651-2","DOIUrl":"10.1016/S1287-4620(00)88651-2","url":null,"abstract":"<div><p>The urine transport through the ureter is made with isolated pockets denoted “bolus”. We adopt some hypothesis, as axial symmetry, constancy of the bolus velocity and steadiness of the whole motion.</p><p>Taking into account the important terms, the analytical resolution of the equations leads to the determination of the field of velocities in the urine, in the wall and the bolus shape, depending on 5 parameters whose some suitable choice of the values permits to obtain solutions compatible with medical observations.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1265-1268"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88651-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86884522","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
Une nouvelle stratégie de calcul micro/macro en mécanique des structures 结构力学中微观/宏观计算的新策略
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88647-0
Pierre Ladevèze, David Dureisseix
{"title":"Une nouvelle stratégie de calcul micro/macro en mécanique des structures","authors":"Pierre Ladevèze,&nbsp;David Dureisseix","doi":"10.1016/S1287-4620(00)88647-0","DOIUrl":"10.1016/S1287-4620(00)88647-0","url":null,"abstract":"<div><p>A new micro-macro computational strategy is proposed for the analysis of structures which are described up to the “micro” level, such as composite structures. It is intended to replace standard homogenization techniques coupled with a local reanalysis, at least for several domains of interest. This paper describes the basis of the new approach.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1237-1244"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88647-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76643959","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: 34
Loi d'évolution de l'endommagement anisotrope 各向异性损伤演化定律
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88646-9
Jean Lemaitre , Rodrigue Desmorat , Maxime Sauzay
{"title":"Loi d'évolution de l'endommagement anisotrope","authors":"Jean Lemaitre ,&nbsp;Rodrigue Desmorat ,&nbsp;Maxime Sauzay","doi":"10.1016/S1287-4620(00)88646-9","DOIUrl":"10.1016/S1287-4620(00)88646-9","url":null,"abstract":"<div><p>A formulation for anisotropic damage is established in the framework of the principle of strain equivalence. The damage variable is still related to the surface density of microcracks and microvoids, and, as its evolution is governed by the plastic strain, it is represented by a second-order tensor and is orthotropic. The coupling of damage with elasticity is expressed in tensor form on the deviatoric part of the stress tensor and in scalar form by its trace on the hydrostatic part. The kinetic law of damage evolution is an extension of the isotropic case. Here the principal components of the damage rate tensor are proportional to the absolute value of the principal components of the plastic strain rate tensor. The proposed damage evolution law does not introduce any other material parameter. Several series of experiments give a good validation of this theory.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1231-1236"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88646-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86938530","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
Dérivées de fonctionnelles intégrales dans des perturbations de fissures exprimées par intégrales de frontière 由边界积分表示的裂纹扰动中的积分函数导出
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88644-5
Marc Bonnet
{"title":"Dérivées de fonctionnelles intégrales dans des perturbations de fissures exprimées par intégrales de frontière","authors":"Marc Bonnet","doi":"10.1016/S1287-4620(00)88644-5","DOIUrl":"10.1016/S1287-4620(00)88644-5","url":null,"abstract":"<div><p>This note presents, in the framework of three-dimensional linear elastodynamics in the time domain, a method for evaluating sensitivities of integral functionals to crack shapes, based on the adjoint state approach and resulting in a sensitivity formula expressed in terms of surface integrals (on the external boundary and the crack surface) and contour integrals (involving the direct and adjoint stress intensity factor distributions on the crack front). This method is well-suited to boundary element treatments of e.g. crack reconstruction inverse problems.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1215-1221"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88644-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76241038","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
Branchement d'une fissure initialement fermée en présence de frottement 在存在摩擦的情况下连接最初封闭的裂缝
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 1999-11-01 DOI: 10.1016/S1287-4620(00)88649-4
Joël Frelat, Jean-Baptiste Leblond
{"title":"Branchement d'une fissure initialement fermée en présence de frottement","authors":"Joël Frelat,&nbsp;Jean-Baptiste Leblond","doi":"10.1016/S1287-4620(00)88649-4","DOIUrl":"10.1016/S1287-4620(00)88649-4","url":null,"abstract":"<div><p>We study crack kinking in the situation where the crack is initially closed by compression forces but opens up as a result of kinking. This problem was considered very recently by the authors in the case where contact between the crack lips occurred without friction. The study is extended here to the (obviously more physically realistic) case where friction is present and obeys Coulomb 's law. We consider in particular the problem of <em>configurational stability</em> of the propagation path, as governed by the applied load. It is found that introduction of friction does not qualitatively modify the conclusions drawn in the frictionless case.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"327 12","pages":"Pages 1251-1258"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)88649-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80450771","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
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