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ENGINEERING (1248 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 20)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 277)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 44)
Advances in Science and Research (ASR)     Open Access   (Followers: 5)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 5)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 26)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Full-text available via subscription   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 277)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 213)
Composites Part B : Engineering     Hybrid Journal   (Followers: 248)
Composites Science and Technology     Hybrid Journal   (Followers: 188)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 43)

        1 2 3 4 5 6 7 | Last

Journal Cover Comptes Rendus Mécanique
  [SJR: 0.633]   [H-I: 32]   [2 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 1631-0721
   Published by Elsevier Homepage  [3175 journals]
  • Unsteady free surface flow in porous media: One-dimensional model
           equations including vertical effects and seepage face
    • Authors: Carmine Di Nucci
      Pages: 366 - 383
      Abstract: Publication date: May 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 5
      Author(s): Carmine Di Nucci
      This note examines the two-dimensional unsteady isothermal free surface flow of an incompressible fluid in a non-deformable, homogeneous, isotropic, and saturated porous medium (with zero recharge and neglecting capillary effects). Coupling a Boussinesq-type model for nonlinear water waves with Darcy's law, the two-dimensional flow problem is solved using one-dimensional model equations including vertical effects and seepage face. In order to take into account the seepage face development, the system equations (given by the continuity and momentum equations) are completed by an integral relation (deduced from the Cauchy theorem). After testing the model against data sets available in the literature, some numerical simulations, concerning the unsteady flow through a rectangular dam (with an impermeable horizontal bottom), are presented and discussed.

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.03.003
  • Disk in a groove with friction: An analysis of static equilibrium and
    • Authors: Cesare Donolato
      Pages: 384 - 389
      Abstract: Publication date: May 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 5
      Author(s): Cesare Donolato
      This note studies the statics of a rigid disk placed in a V-shaped groove with frictional walls and subjected to gravity and a torque. The two-dimensional equilibrium problem is formulated in terms of the angles that contact forces form with the normal to the walls. This approach leads to a single trigonometric equation in two variables whose domain is determined by Coulomb's law of friction. The properties of solutions (existence, uniqueness, or indeterminacy) as functions of groove angle, friction coefficient and applied torque are derived by a simple geometric representation. The results modify some of the conclusions by other authors on the same problem.

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.03.001
  • Blow-up of solutions to a quasilinear wave equation for high initial
    • Authors: Fang Li; Fang Liu
      Pages: 402 - 407
      Abstract: Publication date: May 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 5
      Author(s): Fang Li, Fang Liu
      This paper deals with blow-up solutions to a nonlinear hyperbolic equation with variable exponent of nonlinearities. By constructing a new control function and using energy inequalities, the authors obtain the lower bound estimate of the L 2 norm of the solution. Furthermore, the concavity arguments are used to prove the nonexistence of solutions; at the same time, an estimate of the upper bound of blow-up time is also obtained. This result extends and improves those of [1,2].

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.03.002
  • Co-simulation coupling spectral/finite elements for 3D soil/structure
           interaction problems
    • Authors: Loïc Zuchowski; Michael Brun; Florent De Martin
      Pages: 408 - 422
      Abstract: Publication date: May 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 5
      Author(s): Loïc Zuchowski, Michael Brun, Florent De Martin
      The coupling between an implicit finite elements (FE) code and an explicit spectral elements (SE) code has been explored for solving the elastic wave propagation in the case of soil/structure interaction problem. The coupling approach is based on domain decomposition methods in transient dynamics. The spatial coupling at the interface is managed by a standard coupling mortar approach, whereas the time integration is dealt with an hybrid asynchronous time integrator. An external coupling software, handling the interface problem, has been set up in order to couple the FE software Code_Aster with the SE software EFISPEC3D.

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.02.001
  • The stochastic energy-Casimir method
    • Authors: Alexis Arnaudon; Nader Ganaba; Darryl D. Holm
      Pages: 279 - 290
      Abstract: Publication date: Available online 1 February 2018
      Source:Comptes Rendus Mécanique
      Author(s): Alexis Arnaudon, Nader Ganaba, Darryl D. Holm
      In this paper, we extend the energy-Casimir stability method for deterministic Lie–Poisson Hamiltonian systems to provide sufficient conditions for stability in probability of stochastic dynamical systems with symmetries. We illustrate this theory with classical examples of coadjoint motion, including the rigid body, the heavy top, and the compressible Euler equation in two dimensions. The main result is that stable deterministic equilibria remain stable in probability up to a certain stopping time that depends on the amplitude of the noise for finite-dimensional systems and on the amplitude of the spatial derivative of the noise for infinite-dimensional systems.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2018.01.003
  • Stability analysis of internally damped rotating composite shafts using a
           finite element formulation
    • Authors: Safa Ben Arab; José Dias Rodrigues; Slim Bouaziz; Mohamed Haddar
      Pages: 291 - 307
      Abstract: Publication date: Available online 12 January 2018
      Source:Comptes Rendus Mécanique
      Author(s): Safa Ben Arab, José Dias Rodrigues, Slim Bouaziz, Mohamed Haddar
      This paper deals with the stability analysis of internally damped rotating composite shafts. An Euler–Bernoulli shaft finite element formulation based on Equivalent Single Layer Theory (ESLT), including the hysteretic internal damping of composite material and transverse shear effects, is introduced and then used to evaluate the influence of various parameters: stacking sequences, fiber orientations and bearing properties on natural frequencies, critical speeds, and instability thresholds. The obtained results are compared with those available in the literature using different theories. The agreement in the obtained results show that the developed Euler–Bernoulli finite element based on ESLT including hysteretic internal damping and shear transverse effects can be effectively used for the stability analysis of internally damped rotating composite shafts. Furthermore, the results revealed that rotor stability is sensitive to the laminate parameters and to the properties of the bearings.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2018.01.002
  • Non-linear vibrations of sandwich viscoelastic shells
    • Authors: Lahcen Benchouaf; El Hassan Boutyour; El Mostafa Daya; Michel Potier-Ferry
      Pages: 308 - 319
      Abstract: Publication date: Available online 23 February 2018
      Source:Comptes Rendus Mécanique
      Author(s): Lahcen Benchouaf, El Hassan Boutyour, El Mostafa Daya, Michel Potier-Ferry
      This paper deals with the non-linear vibration of sandwich viscoelastic shell structures. Coupling a harmonic balance method with the Galerkin's procedure, one obtains an amplitude equation depending on two complex coefficients. The latter are determined by solving a classical eigenvalue problem and two linear ones. This permits to get the non-linear frequency and the non-linear loss factor as functions of the displacement amplitude. To validate our approach, these relationships are illustrated in the case of a circular sandwich ring.

      PubDate: 2018-02-26T09:58:26Z
      DOI: 10.1016/j.crme.2017.12.013
  • Static and dynamic behaviour of nonlocal elastic bar using integral
           strain-based and peridynamic models
    • Authors: Noël Challamel
      Pages: 320 - 335
      Abstract: Publication date: Available online 10 January 2018
      Source:Comptes Rendus Mécanique
      Author(s): Noël Challamel
      The static and dynamic behaviour of a nonlocal bar of finite length is studied in this paper. The nonlocal integral models considered in this paper are strain-based and relative displacement-based nonlocal models; the latter one is also labelled as a peridynamic model. For infinite media, and for sufficiently smooth displacement fields, both integral nonlocal models can be equivalent, assuming some kernel correspondence rules. For infinite media (or finite media with extended reflection rules), it is also shown that Eringen's differential model can be reformulated into a consistent strain-based integral nonlocal model with exponential kernel, or into a relative displacement-based integral nonlocal model with a modified exponential kernel. A finite bar in uniform tension is considered as a paradigmatic static case. The strain-based nonlocal behaviour of this bar in tension is analyzed for different kernels available in the literature. It is shown that the kernel has to fulfil some normalization and end compatibility conditions in order to preserve the uniform strain field associated with this homogeneous stress state. Such a kernel can be built by combining a local and a nonlocal strain measure with compatible boundary conditions, or by extending the domain outside its finite size while preserving some kinematic compatibility conditions. The same results are shown for the nonlocal peridynamic bar where a homogeneous strain field is also analytically obtained in the elastic bar for consistent compatible kinematic boundary conditions at the vicinity of the end conditions. The results are extended to the vibration of a fixed–fixed finite bar where the natural frequencies are calculated for both the strain-based and the peridynamic models.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.12.014
  • Classical and sequential limit analysis revisited
    • Authors: Jean-Baptiste Leblond; Djimédo Kondo; Léo Morin; Almahdi Remmal
      Pages: 336 - 349
      Abstract: Publication date: Available online 5 January 2018
      Source:Comptes Rendus Mécanique
      Author(s): Jean-Baptiste Leblond, Djimédo Kondo, Léo Morin, Almahdi Remmal
      Classical limit analysis applies to ideal plastic materials, and within a linearized geometrical framework implying small displacements and strains. Sequential limit analysis was proposed as a heuristic extension to materials exhibiting strain hardening, and within a fully general geometrical framework involving large displacements and strains. The purpose of this paper is to study and clearly state the precise conditions permitting such an extension. This is done by comparing the evolution equations of the full elastic–plastic problem, the equations of classical limit analysis, and those of sequential limit analysis. The main conclusion is that, whereas classical limit analysis applies to materials exhibiting elasticity – in the absence of hardening and within a linearized geometrical framework –, sequential limit analysis, to be applicable, strictly prohibits the presence of elasticity – although it tolerates strain hardening and large displacements and strains. For a given mechanical situation, the relevance of sequential limit analysis therefore essentially depends upon the importance of the elastic–plastic coupling in the specific case considered.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.12.015
  • The legacy of a deep thinker: Jean-Jacques Moreau
    • Authors: Emmanuel Villermaux; Pierre Suquet
      Pages: 153 - 155
      Abstract: Publication date: Available online 12 January 2018
      Source:Comptes Rendus Mécanique
      Author(s): Emmanuel Villermaux, Pierre Suquet

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.12.003
  • Helicity and other conservation laws in perfect fluid motion
    • Authors: Denis Serre
      Pages: 175 - 183
      Abstract: Publication date: Available online 21 February 2018
      Source:Comptes Rendus Mécanique
      Author(s): Denis Serre
      In this review paper, we discuss helicity from a geometrical point of view and see how it applies to the motion of a perfect fluid. We discuss its relation with the Hamiltonian structure, and then its extension to arbitrary space dimensions. We also comment about the existence of additional conservation laws for the Euler equation, and its unlikely integrability in Liouville's sense.

      PubDate: 2018-02-26T09:58:26Z
      DOI: 10.1016/j.crme.2017.12.001
  • Impact of local diffusion on macroscopic dispersion in three-dimensional
           porous media
    • Authors: Arthur Dartois; Anthony Beaudoin; Serge Huberson
      Pages: 89 - 97
      Abstract: Publication date: February 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 2
      Author(s): Arthur Dartois, Anthony Beaudoin, Serge Huberson
      While macroscopic longitudinal and transverse dispersion in three-dimensional porous media has been simulated previously mostly under purely advective conditions, the impact of diffusion on macroscopic dispersion in 3D remains an open question. Furthermore, both in 2D and 3D, recurring difficulties have been encountered due to computer limitation or analytical approximation. In this work, we use the Lagrangian velocity covariance function and the temporal derivative of second-order moments to study the influence of diffusion on dispersion in highly heterogeneous 2D and 3D porous media. The first approach characterizes the correlation between the values of Eulerian velocity components sampled by particles undergoing diffusion at two times. The second approach allows the estimation of dispersion coefficients and the analysis of their behaviours as functions of diffusion. These two approaches allowed us to reach new results. The influence of diffusion on dispersion seems to be globally similar between highly heterogeneous 2D and 3D porous media. Diffusion induces a decrease in the dispersion in the direction parallel to the flow direction and an increase in the dispersion in the direction perpendicular to the flow direction. However, the amplification of these two effects with the permeability variance is clearly different between 2D and 3D. For the direction parallel to the flow direction, the amplification is more important in 3D than in 2D. It is reversed in the direction perpendicular to the flow direction.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.12.012
  • Limit analysis, rammed earth material and Casagrande test
    • Authors: Ranime El-Nabouch; Joseph Pastor; Quoc-Bao Bui; Olivier Plé
      Pages: 98 - 109
      Abstract: Publication date: February 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 2
      Author(s): Ranime El-Nabouch, Joseph Pastor, Quoc-Bao Bui, Olivier Plé
      The present paper is concerned with the simulation of the Casagrande test carried out on a rammed earth material for wall-type structures in the framework of Limit Analysis (LA). In a preliminary study, the material is considered as a homogeneous Coulomb material, and existing LA static and kinematic codes are used for the simulation of the test. In each loading case, static and kinematic bounds coincide; the corresponding exact solution is a two-rigid-block mechanism together with a quasi-constant stress vector and a velocity jump also constant along the interface, for the three loading cases. In a second study, to take into account the influence of compressive loadings related to the porosity of the material, an elliptic criterion (denoted Cohesive Cam–Clay, CCC) is defined based on recent homogenization results about the hollow sphere model for porous Coulomb materials. Finally, original finite element formulations of the static and mixed kinematic methods for the CCC material are developed and applied to the Casagrande test. The results are the same than above, except that this time the velocity jump depends on the compressive loading, which is more realistic but not satisfying fully the experimental observations. Therefore, the possible extensions of this work towards non-standard direct methods are analyzed in the conclusion section.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.11.007
  • Crack identification method in beam-like structures using changes in
           experimentally measured frequencies and Particle Swarm Optimization
    • Authors: Samir Khatir; Kevin Dekemele; Mia Loccufier; Tawfiq Khatir; Magd Abdel Wahab
      Pages: 110 - 120
      Abstract: Publication date: February 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 2
      Author(s): Samir Khatir, Kevin Dekemele, Mia Loccufier, Tawfiq Khatir, Magd Abdel Wahab
      In this paper, a technique is presented for the detection and localization of an open crack in beam-like structures using experimentally measured natural frequencies and the Particle Swarm Optimization (PSO) method. The technique considers the variation in local flexibility near the crack. The natural frequencies of a cracked beam are determined experimentally and numerically using the Finite Element Method (FEM). The optimization algorithm is programmed in MATLAB. The algorithm is used to estimate the location and severity of a crack by minimizing the differences between measured and calculated frequencies. The method is verified using experimentally measured data on a cantilever steel beam. The Fourier transform is adopted to improve the frequency resolution. The results demonstrate the good accuracy of the proposed technique.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.11.008
  • Proper Generalized Decomposition (PGD) for the numerical simulation of
           polycrystalline aggregates under cyclic loading
    • Authors: Mohamed Aziz Nasri; Camille Robert; Amine Ammar; Saber El Arem; Franck Morel
      Pages: 132 - 151
      Abstract: Publication date: February 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 2
      Author(s): Mohamed Aziz Nasri, Camille Robert, Amine Ammar, Saber El Arem, Franck Morel
      The numerical modelling of the behaviour of materials at the microstructural scale has been greatly developed over the last two decades. Unfortunately, conventional resolution methods cannot simulate polycrystalline aggregates beyond tens of loading cycles, and they do not remain quantitative due to the plasticity behaviour. This work presents the development of a numerical solver for the resolution of the Finite Element modelling of polycrystalline aggregates subjected to cyclic mechanical loading. The method is based on two concepts. The first one consists in maintaining a constant stiffness matrix. The second uses a time/space model reduction method. In order to analyse the applicability and the performance of the use of a space–time separated representation, the simulations are carried out on a three-dimensional polycrystalline aggregate under cyclic loading. Different numbers of elements per grain and two time increments per cycle are investigated. The results show a significant CPU time saving while maintaining good precision. Moreover, increasing the number of elements and the number of time increments per cycle, the model reduction method is faster than the standard solver.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.crme.2017.11.009
  • Multi-periodic boundary conditions and the Contact Dynamics method
    • Authors: Saeid Nezamabadi; Thanh H. Nguyen; Jean-Yves Delenne; Julien Averseng; Xavier Frank; Farhang Radjai
      Pages: 141 - 147
      Abstract: Publication date: Available online 27 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Farhang Radjai
      For investigating the mechanical behavior of granular materials by means of the discrete element approach, it is desirable to be able to simulate representative volume elements with macroscopically homogeneous deformations. This can be achieved by means of fully periodic boundary conditions such that stresses or displacements can be applied in all space directions. We present a general framework for periodic boundary conditions in granular materials and its implementation more specifically in the Contact Dynamics method.

      PubDate: 2018-02-05T08:44:44Z
      DOI: 10.1016/j.proeng.2017.01.044
  • Influence of particle shape on the microstructure evolution and the
           mechanical properties of granular materials
    • Authors: Jianqiu Tian; Enlong Liu; Lian Jiang; Xiaoqiong Jiang; Yi Sun; Ran Xu
      Abstract: Publication date: Available online 5 April 2018
      Source:Comptes Rendus Mécanique
      Author(s): Jianqiu Tian, Enlong Liu, Lian Jiang, Xiaoqiong Jiang, Yi Sun, Ran Xu
      In order to study the influence of particle shape on the microstructure evolution and the mechanical properties of granular materials, a two-dimensional DEM analysis of samples with three particle shapes, including circular particles, triangular particles, and elongated particles, is proposed here to simulate the direct shear tests of coarse-grained soils. For the numerical test results, analyses are conducted in terms of particle rotations, fabric evolution, and average path length evolution. A modified Rowe's stress–dilatancy equation is also proposed and successfully fitted onto simulation data.

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.03.006
  • “Tepid” Geysers above salt caverns
    • Authors: Pierre Bérest; Benoît Brouard; Vassily Zakharov
      Abstract: Publication date: Available online 29 March 2018
      Source:Comptes Rendus Mécanique
      Author(s): Pierre Bérest, Benoît Brouard, Vassily Zakharov
      The formation of a brine geyser erupting from the wellhead of a large underground salt cavern is described. In most cases, the brine outflow from an opened cavern is slow; it results from the cavern creep closure and the thermal expansion of the cavern brine. These two processes are smooth; however, the brine outflow often is bumpy, as it is modulated by atmospheric pressure variations that generate an elastic increase (or decrease) of both cavern and brine volumes. In addition, when the flow is fast enough, the brine thermodynamic behavior in the wellbore is adiabatic. The cold brine expelled from the cavern wellhead is substituted with warm brine entering the borehole bottom, resulting in a lighter brine column. The brine outflow increases. In some cases, the flow becomes so fast that inertia terms must be taken into account. A geyser forms, coming to an end when the pressure in the cavern has dropped sufficiently. A better picture is obtained when head losses are considered. A closed-form solution can be reached. This proves that two cases must be distinguished, depending on whether the cold brine initially contained in the wellbore is expelled fully or not. It can also be shown that geyser formation is a rare event, as it requires both that the wellbore be narrow and that the cavern be very compressible. This study stemmed from an actual example in which a geyser was observed. However, scarce information is available, making any definite interpretation difficult.

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.03.004
  • A coated rigid elliptical inclusion loaded by a couple in the presence of
           uniform interfacial and hoop stresses
    • Authors: Xu Wang; Peter Schiavone
      Abstract: Publication date: Available online 28 March 2018
      Source:Comptes Rendus Mécanique
      Author(s): Xu Wang, Peter Schiavone
      We consider a confocally coated rigid elliptical inclusion, loaded by a couple and introduced into a remote uniform stress field. We show that uniform interfacial and hoop stresses along the inclusion–coating interface can be achieved when the two remote normal stresses and the remote shear stress each satisfy certain conditions. Our analysis indicates that: (i) the uniform interfacial tangential stress depends only on the area of the inclusion and the moment of the couple; (ii) the rigid-body rotation of the rigid inclusion depends only on the area of the inclusion, the coating thickness, the shear moduli of the composite and the moment of the couple; (iii) for given remote normal stresses and material parameters, the coating thickness and the aspect ratio of the inclusion are required to satisfy a particular relationship; (iv) for prescribed remote shear stress, moment and given material parameters, the coating thickness, the size and aspect ratio of the inclusion are also related. Finally, a harmonic rigid inclusion emerges as a special case if the coating and the matrix have identical elastic properties.

      PubDate: 2018-04-15T14:44:46Z
      DOI: 10.1016/j.crme.2018.03.005
  • Integration of topological modification within the modeling of
           multi-physics systems: Application to a Pogo-stick
    • Authors: Nourhene Abdeljabbar Kharrat; Régis Plateaux; Mariem Miladi Chaabane; Jean-Yves Choley; Chafik Karra; Mohamed Haddar
      Abstract: Publication date: Available online 21 February 2018
      Source:Comptes Rendus Mécanique
      Author(s): Nourhene Abdeljabbar Kharrat, Régis Plateaux, Mariem Miladi Chaabane, Jean-Yves Choley, Chafik Karra, Mohamed Haddar
      The present work tackles the modeling of multi-physics systems applying a topological approach while proceeding with a new methodology using a topological modification to the structure of systems. Then the comparison with the Magos' methodology is made. Their common ground is the use of connectivity within systems. The comparison and analysis of the different types of modeling show the importance of the topological methodology through the integration of the topological modification to the topological structure of a multi-physics system. In order to validate this methodology, the case of Pogo-stick is studied. The first step consists in generating a topological graph of the system. Then the connectivity step takes into account the contact with the ground. During the last step of this research; the MGS language (Modeling of General System) is used to model the system through equations. Finally, the results are compared to those obtained by MODELICA. Therefore, this proposed methodology may be generalized to model multi-physics systems that can be considered as a set of local elements.

      PubDate: 2018-02-26T09:58:26Z
      DOI: 10.1016/j.crme.2018.01.004
  • Influences of the separation distance, ship speed and channel dimension on
           ship maneuverability in a confined waterway
    • Authors: Peng Du; Abdellatif Ouahsine; Philippe Sergent
      Abstract: Publication date: Available online 14 February 2018
      Source:Comptes Rendus Mécanique
      Author(s): Peng Du, Abdellatif Ouahsine, Philippe Sergent
      Ship maneuvering in the confined inland waterway is investigated using the system-based method, where a nonlinear transient hydrodynamic model is adopted and confinement models are implemented to account for the influence of the channel bank and bottom. The maneuvering model is validated using the turning circle test, and the confinement model is validated using the experimental data. The separation distance, ship speed, and channel width are then varied to investigate their influences on ship maneuverability. With smaller separation distances and higher speeds near the bank, the ship's trajectory deviates more from the original course and the bow is repelled with a larger yaw angle, which increase the difficulty of maneuvering. Smaller channel widths induce higher advancing resistances on the ship. The minimum distance to the bank are extracted and studied. It is suggested to navigate the ship in the middle of the channel and with a reasonable speed in the restricted waterway.

      PubDate: 2018-02-26T09:58:26Z
      DOI: 10.1016/j.crme.2018.01.005
  • Publication list of Jean-Jacques Moreau
    • Abstract: Publication date: Available online 13 February 2018
      Source:Comptes Rendus Mécanique

      PubDate: 2018-02-26T09:58:26Z
  • An engineering predictive approach of fatigue crack growth behavior: The
           case of the lug-type joint
    • Authors: Ahmed Bahloul; Amal Ben Ahmed; Chokri Bouraoui
      Pages: 430 - 437
      Abstract: Publication date: Available online 7 November 2017
      Source:Comptes Rendus Mécanique
      Author(s): Ahmed Bahloul, Amal Ben Ahmed, Chokri Bouraoui
      The present attempt proposes a predictive approach of the fatigue crack growth (FCG) behavior of a lug-type joint used in an aeronautic context. The crack tip residual stress distribution and material dispersions are considered. The developed approach was implemented by coupling the Extended Finite Element Method (XFEM), the Residual Corrected Stress Intensity Factor (RC-SIF), developed by the authors, and the Monte Carlo simulation (MCS) method. The Lemaitre–Chaboche model, developed upon the ABAQUS commercial code, was considered for characterizing material behavior. The developed approach treats FCG life by considering the stochastic behavior of material parameters and the crack tip residual stress field during propagation. Comparing with experimental data, the proposed approach exhibits a good ability in evaluating the FCG reliability of a cracked lug-type joint subjected to different loading conditions. The iso-probabilistic P–a–N curves can be used as an efficient tool for ensuring the safety behavior of cracked components.

      PubDate: 2017-11-09T10:58:13Z
      DOI: 10.1016/j.prostr.2017.07.192
  • The effect of indentation sequence on rock breakages: A study based on
           laboratory and numerical tests
    • Authors: Jie Liu; Jun Wang
      Pages: 26 - 38
      Abstract: Publication date: January 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 1
      Author(s): Jie Liu, Jun Wang
      Rock may response differently to external loads applied in different sequences. Thus, we conducted indentation tests to investigate the effect of the indentation sequence on rock breakages. Sequential indentations, consuming less indentation energy, usually resulted in larger and deeper grooves and then led to lower specific energies. Thus, we conclude that sequential indentations occur instead of simultaneous indentations form larger grooves with the same indentation energy. To further validate this conclusion, we performed a series of numerical tests. The numerical analysis of stress evolution shows that, for simultaneous indentations, the propagation of an internal crack from an inner rim restrained the propagation of the other internal crack from the other inner rim. However, the chipping pattern varied for sequential indentations. In the first indentation process, an internal crack, initiating from an inner rim, is usually connected with an internal crack caused by the second indentation. The deflection angles of the internal cracks for the sequential indentations were smaller because of the lower compressive stress in the horizontal direction. Then, these smaller deflection angles led to larger chips.

      PubDate: 2017-12-26T14:39:31Z
      DOI: 10.1016/j.crme.2017.11.004
  • Neural network solution to an inverse problem associated with the
           eigenvalues of the Stokes operator
    • Authors: Sebastián Ossandón; Mauricio Barrientos; Camilo Reyes
      Pages: 39 - 47
      Abstract: Publication date: January 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 1
      Author(s): Sebastián Ossandón, Mauricio Barrientos, Camilo Reyes
      A numerical method, based on the design of two artificial neural networks, is presented in order to approximate the viscosity and density features of fluids from the eigenvalues of the Stokes operator. The finite element method is used to solve the direct problem by training a first artificial neural network. A nonlinear map of eigenvalues of the Stokes operator as a function of the viscosity and density of the fluid under study is then obtained. This relationship is later inverted and refined by training a second artificial neural network, solving the aforementioned inverse problem. Numerical examples are presented in order to show the effectiveness and the limitations of this methodology.

      PubDate: 2017-12-26T14:39:31Z
      DOI: 10.1016/j.crme.2017.11.006
  • A layerwise C0-type higher order shear deformation theory for laminated
           composite and sandwich plates
    • Authors: Chien H. Thai; Magd Abdel Wahab; Hung Nguyen-Xuan
      Pages: 57 - 76
      Abstract: Publication date: January 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 1
      Author(s): Chien H. Thai, Magd Abdel Wahab, Hung Nguyen-Xuan
      A novel layerwise C0-type higher order shear deformation theory (layerwise C0-type HSDT) for the analysis of laminated composite and sandwich plates is proposed. A C0-type HSDT is used in each lamina layer and the continuity of in-plane displacements and transverse shear stresses at inner-laminar layer is consolidated. The present layerwise theory retains only seven variables without increasing the number of variables when the number of lamina layers are intensified. The shear stresses through the plate thickness derived from the constitutive equation of the present theory have the same shape as those calculated from the equilibrium equation. In addition, the artificial constraints are added in the principle of virtual displacements (PVD) and are certainly fulfilled through a penalty approach. In this paper, two C0-continuity numerical methods, such as the Finite Element Method (FEM) and Bézier isogeometric element (BIEM) are utilized to solve a discrete system of equations derived from the PVD. Several numerical examples with various geometries, aspect ratios, stiffness ratios, and boundary conditions are investigated and compared with the 3D elasticity solution, the analytical, as well as, numerical solutions based on various plate theories.

      PubDate: 2017-12-26T14:39:31Z
      DOI: 10.1016/j.crme.2017.11.001
  • Effects of modal truncation and condensation methods on the Frequency
           Response Function of a stage reducer connected by rigid coupling to a
           planetary gear system
    • Authors: Marwa Bouslema; Ahmed Frikha; Moez Abdennadhar; Tahar Fakhfakh; Rachid Nasri; Mohamed Haddar
      Pages: 807 - 823
      Abstract: Publication date: Available online 2 November 2017
      Source:Comptes Rendus Mécanique
      Author(s): Marwa Bouslema, Ahmed Frikha, Moez Abdennadhar, Tahar Fakhfakh, Rachid Nasri, Mohamed Haddar
      The present paper is aimed at the application of a substructure methodology, based on the Frequency Response Function (FRF) simulation technique, to analyze the vibration of a stage reducer connected by a rigid coupling to a planetary gear system. The computation of the vibration response was achieved using the FRF-based substructuring method. First of all, the two subsystems were analyzed separately and their FRF were obtained. Then the coupled model was analyzed indirectly using the substructuring technique. A comparison between the full system response and the coupled model response using the FRF substructuring was investigated to validate the coupling method. Furthermore, a parametric study of the effect of the shaft coupling stiffness on the FRF was discussed and the effects of modal truncation and condensation methods on the FRF of subsystems were analyzed.

      PubDate: 2017-11-09T10:58:13Z
      DOI: 10.1016/j.crme.2017.09.008
  • Description analytique complète des limites de l'espace de travail pour
           un manipulateur en série plan
    • Authors: Bastien
      Abstract: Publication date: January 2018
      Source:Comptes Rendus Mécanique, Volume 346, Issue 1
      Author(s): Jérôme Bastien
      We give a general and analytical description of plan workspace boundaries, i.e. the boundaries of the part of the space that is reached by the extremity of a human or robot arm. The proposed method is decomposed into three independent steps, for which we do not use calculus of derivatives, determinants and eigenvalues, or numerical resolutions of non-linear problems, which are often used in the literature. The first step, already presented in previous works, consists in interpreting geometrically the necessary Jacobian rank deficiency of the position function at the boundary, and an alignment condition of some joints allows us to determine a union of arcs of circle, which contains the boundary. Then, for all arc of circle, the study of the infinitesimal displacement of a point with regard to this circle allows one to eliminate all or a part of arcs of circle, previously defined, which is not on the boundary. Finally, a global course of the arcs of circle allows us to determine the outer boundary and the inner boundary of the possible void that contains the origin.

      PubDate: 2017-12-26T14:39:31Z
  • The Contact Dynamics method: A nonsmooth story
    • Authors: Dubois Vincent; Acary Michel Jean
      Abstract: Publication date: Available online 21 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Frédéric Dubois, Vincent Acary, Michel Jean
      When velocity jumps are occurring, the dynamics is said to be nonsmooth. For instance, in collections of contacting rigid bodies, jumps are caused by shocks and dry friction. Without compliance at the interface, contact laws are not only non-differentiable in the usual sense but also multi-valued. Modeling contacting bodies is of interest in order to understand the behavior of numerous mechanical systems such as flexible multi-body systems, granular materials or masonry. These granular materials behave puzzlingly either like a solid or a fluid and a description in the frame of classical continuous mechanics would be welcome though far to be satisfactory nowadays. Jean-Jacques Moreau greatly contributed to convex analysis, functions of bounded variations, differential measure theory, sweeping process theory, definitive mathematical tools to deal with nonsmooth dynamics. He converted all these underlying theoretical ideas into an original nonsmooth implicit numerical method called Contact Dynamics (CD); a robust and efficient method to simulate large collections of bodies with frictional contacts and impacts. The CD method offers a very interesting complementary alternative to the family of smoothed explicit numerical methods, often called Distinct Elements Method (DEM). In this paper developments and improvements of the CD method are presented together with a critical comparative review of advantages and drawbacks of both approaches.

      PubDate: 2017-12-26T14:39:31Z
  • Dynamics of a particle with friction and delay
    • Authors: Manuel D.P.; Monteiro Marques Raoul Dzonou
      Abstract: Publication date: Available online 21 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Manuel D.P. Monteiro Marques, Raoul Dzonou
      We are interested in the motion of a simple mechanical system having a finite number of degrees of freedom subjected to a unilateral constraint with dry friction and delay effects (with maximal duration τ > 0 ). At the contact point, we characterize the friction by a Coulomb law associated with a friction cone. Starting from a formulation of the problem that was given by Jean-Jacques Moreau in the form of a second-order differential inclusion in the sense of measures, we consider a sweeping process algorithm that converges towards a solution to the dynamical contact problem. The mathematical machinery as well as the general plan of the existence proof may seem much too heavy in order to treat just this simple case, but they have proved useful in more complex settings.

      PubDate: 2017-12-26T14:39:31Z
  • On some features of the effective behaviour of porous solids with J2- and
           J3-dependent yielding matrix behaviour
    • Authors: Ahmed Benallal
      Abstract: Publication date: Available online 19 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Ahmed Benallal
      Some features od the constitutive behaviour of voided materials taking into account possible effects of the Lode angle in the yielding behaviour of the matrix are discussed. The Gurson approach is used to this end. After providing a parametric representation of the effective behaviour of such materials, some closed-form results are given for pure shear stress states and also at very high stress triaxialities. In the former case corresponding to a zero macroscopic mean stress, the contour of the yield domain in the π-plane has exactly the shape of the yield surface of the matrix in the deviatoric plane, but a size reduced by a factor 1 − f , with f the porosity of the voided material. In the latter, effective yield stresses for the voided material are slightly different from the Gurson result and found to be set by the yield stress at a microscopic stress Lode angle π 3 for very high positive triaxiality and by the yield stress at a microscopic stress Lode angle 0 for very high negative triaxiality. This last result is extended for porous materials with yielding depending further on the hydrostatic stress, fully exhibiting the interaction between volumetric and shear interactions on the yielding behaviour of isotropic porous materials. Applications to many usual yielding criteria for the matrix are also provided.

      PubDate: 2017-12-26T14:39:31Z
  • An overview of the formulation, existence and uniqueness issues for the
           initial value problem raised by the dynamics of discrete systems with
           unilateral contact and dry friction
    • Authors: Patrick Ballard; Alexandre Charles
      Abstract: Publication date: Available online 15 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Patrick Ballard, Alexandre Charles
      In the end of the seventies, Schatzman and Moreau undertook to revisit the venerable dynamics of rigid bodies with contact and dry friction in the light of more recent mathematics. One claimed objective was to reach, for the first time, a mathematically consistent formulation of an initial value problem associated with the dynamics. The purpose of this article is to make a review of the today state-of-art concerning not only the formulation, but also the issues of existence and uniqueness of solution.

      PubDate: 2017-12-26T14:39:31Z
  • A duality recipe for non-convex variational problems
    • Authors: Guy Minh; Phan
      Abstract: Publication date: Available online 14 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Guy Bouchitté, Minh Phan
      The aim of this paper is to present a general convexification recipe that can be useful for studying non-convex variational problems. In particular, this allows us to treat such problems by using a powerful primal–dual scheme. Possible further developments and open issues are given.

      PubDate: 2017-12-26T14:39:31Z
  • Settling velocity of quasi-neutrally-buoyant inertial particles
    • Authors: Marco Martins; Afonso M.A. Gama
      Abstract: Publication date: Available online 6 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Marco Martins Afonso, Sílvio M.A. Gama
      We investigate the sedimentation properties of quasi-neutrally buoyant inertial particles carried by incompressible zero-mean fluid flows. We obtain generic formulae for the terminal velocity in generic space-and-time periodic (or steady) flows, along with further information for flows endowed with some degree of spatial symmetry such as odd parity in the vertical direction. These expressions consist in space-time integrals of auxiliary quantities that satisfy partial differential equations of the advection–diffusion–reaction type, which can be solved at least numerically, since our scheme implies a huge reduction of the problem dimensionality from the full phase space to the classical physical space.

      PubDate: 2017-12-26T14:39:31Z
  • On the self-similar solution to the Euler equations for an incompressible
           fluid in three dimensions
    • Authors: Yves Pomeau
      Abstract: Publication date: Available online 6 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Yves Pomeau
      The equations for a self-similar solution to an inviscid incompressible fluid are mapped into an integral equation that hopefully can be solved by iteration. It is argued that the exponents of the similarity are ruled by Kelvin's theorem of conservation of circulation. The end result is an iteration with a nonlinear term entering a kernel given by a 3D integral for a swirling flow, likely within reach of present-day computational power. Because of the slow decay of the similarity solution at large distances, its kinetic energy diverges, and some mathematical results excluding non-trivial solutions of the Euler equations in the self-similar case do not apply.

      PubDate: 2017-12-26T14:39:31Z
  • Recovering convexity in non-associated plasticity
    • Authors: Gilles Francfort
      Abstract: Publication date: Available online 6 December 2017
      Source:Comptes Rendus Mécanique
      Author(s): Gilles A. Francfort
      We quickly review two main non-associated plasticity models, the Armstrong–Frederick model of nonlinear kinematic hardening and the Drucker–Prager cap model. Non-associativity is commonly thought to preclude any kind of variational formulation, be it in a Hencky-type (static) setting, or when considering a quasi-static evolution because non-associativity destroys convexity. We demonstrate that such an opinion is misguided: associativity (and convexity) can be restored at the expense of the introduction of state variable-dependent dissipation potentials.

      PubDate: 2017-12-26T14:39:31Z
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