Publications

2011

• Newtonian flow of heterogeneous synthetic gabbros at high strain: Grain sliding, ductile failure, and contrasting local mechanisms and interactions
  
  • Dimanov Alexandre
  • Dresen Georg
  • Raphanel J.
  European Journal of Mineralogy, Copernicus, 2011, Volume: 23 (Issue: 3), pp.Pages: 303−322. (10.1127/0935-1221/2011/0023-2110)
  DOI : 10.1127/0935-1221/2011/0023-2110
• Simulation of simplified nuclear glass fracture by molecular dynamics
  
  • Kieu Le-Hai
  • Delaye Jean-Marc
  • Stolz Claude
  , 2011.
• A computational approach for the fatigue design of threaded connections
  
  • Ferjani Mohamed
  • Averbuch Daniel
  • Constantinescu Andrei
  International Journal of Fatigue, Elsevier, 2011, 33, pp.pp. 610-623. The aim of this paper is to propose a lifetime prediction method for threaded connections. The example discussed here is a drillstring connection used in the oil and gas industry. The method is based on a mechanical analysis performed either with finite elements or a closed-form solution described in a companion paper, and a fatigue analysis using the Dang Van criterion which has been extended to finite life domain. The mechanical analysis provides the stabilized stress path and the fatigue analysis provides the fatigue life. Fatigue tests have been performed on small scale threaded connections in order to validate the methodology. The comparisons with the predictions show the difficulties to estimate the fatigue life on structures presenting high stress gradient due to scale effects. (10.1016/j.ijfatigue.2010.11.006)
  DOI : 10.1016/j.ijfatigue.2010.11.006
• The effective behavior of elastic bodies containing microcracks or microholes localized on a surface
  
  • Marigo Jean-Jacques
  • Pideri Catherine
  International Journal of Damage Mechanics, SAGE Publications, 2011, 20 (Special issue of ESMC2009), pp.pages 1151-1177. We propose a two-scale method to find the effective behavior of a three-dimensional linear elastic medium containing a series of microcracks or microholes located on a surface. The obtained effective behavior is that of a homogeneous body with, in place of the actual microdefects, a surface across which the displacements and the stresses suffer jump discontinuities. The transmission conditions are in general of Ventcel's type. The coefficients entering in these jump conditions are obtained by solving six elastic problems posed on an infinite representative cell. The theoretical analysis is illustrated by a few examples. (10.1177/1056789511406914)
  DOI : 10.1177/1056789511406914
• Punch Indentation of Polyurea at Different Velocities: Experiments and Simulations
  
  • Shim J.
  • Mohr Dirk
  Mechanics of Materials, Elsevier, 2011, pp.349-360.
• Effect of Stress Triaxiality and Lode Angle on the Kinetics of Strain-induced Austenite-to-Martensite Transformation
  
  • Beese A.M.
  • Mohr Dirk
  Acta Materialia, Elsevier, 2011, pp.2589-2600.
• The air-liquid flow in a microfluidic airway tree
  
  • Song Yu
  • Baudoin Michael
  • Manneville Paul
  • Baroud Charles N.
  Medical Engineering & Physics, Elsevier, 2011, 33 (7), pp.849-856. Microfluidic techniques are employed to investigate air-liquid flows in the lung. A network of microchannels with five generations is made and used as a simplified model of a section of the pulmonary airway tree. Liquid plugs are injected into the network and pushed by a flow of air; they divide at every bifurcation until they reach the exits of the network. A resistance, associated with the presence of one plug in a given generation, is defined to establish a linear relation between the driving pressure and the total flow rate in the network. Based on this resistance, good predictions are obtained for the flow of two successive plugs in different generations. The total flow rate of a two-plug flow is found to depend not only on the driving pressure and lengths of the plugs, but also the initial distance between them. Furthermore, long range interactions between daughters of a dividing plug are observed and discussed, particularly when the plugs are flowing through the bifurcations. These interactions lead to different flow patterns for different forcing conditions: the flow develops symmetrically when subjected to constant pressure or high flow rate forcing, while a low flow rate driving yields an asymmetric flow. Copyright © 2010 IPEM. Published by Elsevier Ltd (10.1016/j.medengphy.2010.10.001)
  DOI : 10.1016/j.medengphy.2010.10.001
• Legendre-Fenchel duality in elasticity
  
  • Ciarlet Philippe G.
  • Geymonat Giuseppe
  • Krasucki Françoise
  Comptes rendus de l'Académie des sciences. Série I, Mathématique, Elsevier, 2011, 349, pp.597-602. We show that the displacement and strain formulations of the displacement-traction problem of three-dimensional linearized elasticity can be viewed as Legendre-Fenchel dual problems to the stress formulation of the same problem. We also show that each corresponding Lagrangian has a saddle-point, thus fully justifying this new approach to elasticity by means of Legendre-Fenchel duality. (10.1016/j.crma.2011.03.007)
  DOI : 10.1016/j.crma.2011.03.007
• Integrative Mechanobiology of Growth and Architectural Development in Changing Mechanical Environments
  
  • Moulia Bruno B.
  • Der Loughian Christelle C.
  • Bastien Renaud
  • Martin O.
  • Rodriguez M.
  • Gourcilleau Delphine
  • Barbacci A.
  • Badel Eric
  • Franchel G.
  • Lenne C.
  • Roeckel-Drevet Patricia P.
  • Allain Jean-Marc
  • Frachisse J. M.
  • de Langre Emmanuel
  • Coutand Catherine
  • Fournier-Leblanc Nathalie
  • Julien Jean-Louis J.-L.
  , 2011, 9, pp.269-302. Mechanosensitive control of plant growth is a major process shaping how terrestrial plants acclimate to the mechanical challenges set by wind, self-weight, and autostresses. Loads acting on the plant are distributed down to the tissues, following continuum mechanics. Mechanosensing, though, occurs within the cell, building up into integrated signals; yet the reviews on mechanosensing tend to address macroscopic and molecular responses, ignoring the biomechanical aspects of load distribution to tissues and reducing biological signal integration to a "mean plant cell." In this chapter, load distribution and biological signal integration are analyzed directly. The Sum of Strain Sensing model S 3 m is then discussed as a synthesis of the state of the art in quantitative deterministic knowledge and as a template for the development of an integrative and system mechanobiology. (10.1007/978-3-642-19091-9_11)
  DOI : 10.1007/978-3-642-19091-9_11
• In-situ X-ray microtomography characterization of damage in SiC/SiC minicomposites
  
  • Chateau Camille
  • Gélébart Lionel
  • Bornert Michel
  • Crépin Jérôme
  • Boller Elodie
  • Sauder C.
  • Ludwig Wolfgang
  Composites Science and Technology, Elsevier, 2011, 71 (6), pp.916-924. The purpose of the present study is to characterize matrix crack propagation and fiber breaking occurrences within SiC/SiC minicomposite in order to validate later on a multiscale damage model at the local scale. An in-situ X-ray microtomography tensile test was performed at the European Synchrotron Radiation Facility (ESRF, ID19 beamline) in order to obtain 3-dimensional (3D) images at six successive loading levels. Results reveal a slow and discontinuous propagation of matrix cracks, even after the occurrence of matrix crack saturation. A few fiber failures were also observed. However, radiographs of the whole length (14 mm) of the minicomposites under a load and after the failure were more appropriate to get statistical data about fiber breaking. Thus, observations before the ultimate failure revealed only a few fibers breaking homogenously along the minicomposite. In addition, an increase in fiber breaking density in the vicinity of the fatal matrix crack was observed after failure. These experimental results are discussed in regards to assumptions used in usual 1-dimensional (1D) models for minicomposites. (10.1016/j.compscitech.2011.02.008)
  DOI : 10.1016/j.compscitech.2011.02.008
• Semianalytical solution for the stress distribution in notched tubes
  
  • Ferjani Mohamed
  • Averbuch Daniel
  • Constantinescu Andrei
  International Journal of Fatigue, Elsevier, 2011, 33, pp.pp. 557-567. The aim of this paper is to present an alternative solution to the finite element method for the determination of the elastic stress field for an axi-symmetric notched tube under tension and bending loadings. The proposed solution is an extension of the work of Filippi and Lazzarin (2004) [8] to tubular specimens. It provides the stress field distribution along the notch bisector. A good agreement was found between the solution proposed in the present paper and the results from a finite element analysis. A sensitivity analysis is performed to establish the domain of validity of the solution with respect to the dimensions of the notched tube. (10.1016/j.ijfatigue.2010.10.009)
  DOI : 10.1016/j.ijfatigue.2010.10.009
• Hydromechanical behavior of heterogeneous carbonate rock under proportional triaxial loadings
  
  • Dimanov Alexandre
  • Dautriat Jérémie
  • Gland N.
  • Raphanel J.
  Journal of Geophysical Research, American Geophysical Union, 2011, 116 (B01205), pp.DOI: 10.1029/2009JB000830. (10.1029/2009JB000830)
  DOI : 10.1029/2009JB000830
• ON THE MYSTERY OF CALDERÓN'S FORMULA FOR THE GEOMETRY OF AN INCLUSION IN ELASTIC MATERIALS
  
  • Bui Huy Duong
  Journal of Mechanics of Materials and Structures, Mathematical Sciences Publishers, 2011, 6 (1-4), pp.105-111. We consider the nonlinear inverse problem of determining an inclusion in an elastic body, in antiplane shear loading. The perturbation of the shear modulus due to the inclusion was determined by Calderón (1980) in the case of a small amplitude of perturbation. For the general nonlinear case, the problem is decomposed into two linear problems: a source inverse problem, which determines the geometry of the inclusion, and a Volterra integral equation of the first kind for determining the amplitude. In this paper, we deal only with the determination of the inclusion geometry in the two-dimensional problem. We derive a simple formula for determining the inclusion geometry. This formula enables us to investigate the mystery of Calderón's solution for the linearized perturbation h0, raised by Isaacson and Isaacson (1986), in the case of axisymmetry. By using a series method for numerical analysis, they found that the supports of the perturbation, in the linearized theory and the nonlinear theory in the axisymmetric case, are practically the same. We elucidate the mystery by discovering that both theories give exactly the same support of the perturbation, supp.h0/ supp.h/, for the general case of geometry and loadings. Then, we discuss an application of the geometry method to locate an inclusion and solve the source inverse problem, which gives an indication of the amplitude of the perturbation. (10.2140/jomms.2011.6.105)
  DOI : 10.2140/jomms.2011.6.105
• Finite Strain Constitutive Model of Polyurea for a Wide Range of Strain Rates
  
  • Shim J.
  • Mohr Dirk
  International Journal of Plasticity, Elsevier, 2011, pp.868-886.
• On the Predictive Capabilities of the Shear Modified Gurson and the Modified Mohr-Coulomb Fracture Models over a Wide Range of Stress Triaxialities and Lode Angles
  
  • Dunand M.
  • Mohr Dirk
  Journal of the Mechanics and Physics of Solids, Elsevier, 2011, pp.1374-1394.
• Microscale experimental investigation of deformation and damage of argillaceous rocks under cyclic hydric loads
  
  • Wang Linlin
  • Yang Diansen
  • Bornert Michel
  • Chanchole Serge
  • Duc N.M.
  • Halphen Bernard
  , 2011.
• 3D Morphology Evolution of Solid-Fluid Interfaces by Pressure Solution
  
  • Raphanel Jean
  , 2011, pp.127-156.
• Erreur en relation de comportement
  
  • Pagano Stéphane
  • Bonnet Marc
  , 2011, pp.293-318. Dans ce chapitre, on examine la notion d'erreur en relation de comportement (ERC) en tant qu'outil d'identification de paramètres associés à des modèles de comportement de matériaux solides.
• Numerical simulation of the third body in fretting problems
  
  • Basseville Stéphanie
  • Héripré Eva
  • Cailletaud Georges
  Wear, Elsevier, 2011, 270, pp.876-887. This study is devoted to the computation of realistic stress and strain fields at a local scale in fretting. Models are proposed to improve surface and volume modelling, by taking into account the heterogeneity of stress fields due to the irregular interface. This gives a new view toward damage mechanisms. The surface heterogeneity which is considered here, results from the third body trapped in the contact zone. This third body is known to drastically influence the contact conditions. The competition between wear and crack initiation is investigated with respect to local stress fields. The first model is used to study the evolutions of particles and the contact stress according to the loading conditions. Then, Dang Van's multiaxial fatigue model is used to predict cra (10.1016/j.wear.2011.02.016)
  DOI : 10.1016/j.wear.2011.02.016