Riassunto:
The papers in this proceeding are a collection of the works presented at the IUTAM symposium-Marrakech 2002 (October 20-25) which brought together scientists from various countries. These papers cover contemporary topics in multiscale modeling and characterization of materials behavior of engineering materials. They were selected to focus on topics related to deformation and failure in metals, alloys, intermetallics and polymers including: experimental techniques, deformation and failure mechanisms, dislocation-based modelling, microscopic-macroscopic averaging schemes, application to forming processes and to phase transformation, localization and failure phenomena, and computational advances. Key areas that are covered by some of the papers include modeling of material deformation at various scales. At the atomistic scale, results from MD simulations pertaining to deformation mechanisms in nano-crystalline materials as well as dislocation-defect interactions are presented. Advances in modeling of deformation in metals using discrete dislocation analyses are also presented, providing an insight into this emerging scientific technique that can be used to model deformation at the microscale. These papers address current engineering problems, including deformation of thin fIlms, dislocation behavior and strength during nanoindentation, strength in metal matrix composites, dislocation-crack interaction, development of textures in polycrystals, and problems involving twining and shape memory behavior. On Behalf of the organizing committee, I would like to thank Professor P.
Contenuti:
Preface. New developments in the brittle to ductile transitions of fracture in intrinsically brittle crystals and polycrystals; A.S. Argon. Dislocation-based length-scales in crystal plasticity: experiments and modeling; S. Nemat-Nasser. Application of a variational self-consistent procedure to the prediction of deformation textures in polycrystals; P. Gilormini, et al. What about the yield transformation surface determination (austenite --> martensite) with the measurement of austenite and martensite lattice parameters for some shape memory alloys? C. Lexcellent, et al. Micro to macroscopic deformation behavior of amorphous polymer with slightly heterogeneous distribution of molecular chains; Y. Tomita, M. Uchida. Cross slip viewed at the nano- and micrometer scale; T. Leffers, O.B. Pedersen. A multiscale micromechanics approach to describe environmental effects on surface crack initiation under cyclic loading; E.P. Busso, et al. Atomic-scale modelling of dislocation behaviour under stress; D.J. Bacon, Y.N. Osetsky. Coalescence and evolution of nanoscale islands during polycrystalline thin film growth; M.O. Bloomfield, et al. On plc band propagation velocity under stress controlled tests in aluminium alloys; M. Abbadi, et al. Effect of some parameters on the elastoplastic behavior of green sand; R. Ami Saada. Experimental investigations of size effects in thin copper foils; G. Simons, et al. Plastic response of thin films due to thermal cycling; L. Nicola, et al. Measurement of the stress intensity factor, k l, for copper by a digital image correlation method; S. M'guil, et al. Homogenization of viscoplastic materials; A. Molinari, S. Mercier. Collective dislocation behavior in single crystalline aluminum under indentation; Y. Shibutani, et al. Multiscale modelling of texture gradienteffects on localization in fcc polycrystals; K.W. Neale, et al. Multiaxial plastic fatigue behavior with multiscale modeling; A. Abdul-latif, et al. Damage, opening and sliding of grain boundaries; G. Cailletaud, et al. Gradients of hardening in nonlocal dislocation based plasticity; G.Z. Voyiadjis, R.J. Dorgan. Determination of the material intrinsic length scale of gradient plasticity theory; G.Z. Voyiadjis, R.A. Al-Rub. Computer simulation of contact force distribution in random granular packings; A.H.W. Ngan. Three-dimensional structures of the geometrically necessary dislocations generated from non-uniformities in metal microstructures; T. Ohashi. Simulation of texture evolution in equal channel angular extrusion of copper using a new flow field; L.S. Toth, et al. Initial energy dissipation mechanism at crack tip on the ductile to brittle transition; J.W. Kysar. Constitutive modeling of viscoelastic unloading of glassy polymers; Y. Remond. On the constitutive theories of power - law materials containing voids; C.Y. Hsu, et al. Objective quantification of the ductility within the coupling elasticity - damage behavior: formulation; H. Bouabid, et al. Discrete dislocation predictions for single crystal hardening tension vs bending; A.A. Benzerga, A. Needleman. On plasticity and damage evolution during sheet metal forming; C. Husson, et al. Modeling of thermo-electro-elastic effective behaviors of piezoelectric composite mediums and analysis of reinforcement orientation effects; N. Fakri, et al. Investigations in size dependent torsions and fractures; P. Tong, et al. Influence of microstructural parameters on shape memory alloys behavior; C. Niclaeys, et al. Investigation of ridging in ferritic stainless steel using crystal plasticity finite element method;
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