1,958 research outputs found
Effect of aspect ratio on transverse diffusive broadening: A lattice Boltzmann study
We study scaling laws characterizing the inter-diffusive zone between two
miscible fluids flowing side by side in a Y-shape laminar micromixer using the
lattice Boltzmann method. The lattice Boltzmann method solves the coupled 3D
hydrodynamics and mass transfer equations and incorporates intrinsic features
of 3D flows related to this problem. We observe the different power law regimes
occurring at the center of the channel and close to the top/bottom wall. The
extent of the inter-diffusive zone scales as square root of the axial distance
at the center of the channel. At the top/bottom wall, we find an exponent 1/3
at early stages of mixing as observed in the experiments of Ismagilov and
coworkers [Appl. Phys. Lett. 76, 2376 (2000)]. At a larger distance from the
entrance, the scaling exponent close to the walls changes to 1/2 [J.-B. Salmon
et al J. Appl. Phys. 101, 074902 (2007)]. Here, we focus on the effect of
finite aspect ratio on diffusive broadening. Interestingly, we find the same
scaling laws regardless of the channel's aspect ratio. However,the point at
which the exponent 1/3 characterizing the broadening at the top/bottom wall
reverts to the normal diffusive behavior downstream strongly depends on the
aspect ratio. We propose an interpretation of this observation in terms of
shear rate at the side walls. A criterion for the range of aspect ratios with
non-negligible effect on diffusive broadening is also provided.Comment: 19 pages, 7 figure
Microstructure and electromagnetic properties of heavily cold worked Cu-20 wt.%Nb wires
Fiber or ribbon reinforced in-situ metal matrix composites (MMCs) consisting of Cu and 20 wt.% Nb can be produced by large strain wire drawing. The microstructure of the composites is investigated by means of optical and electron microscopy. The normal and superconducting properties of the MMC wires in the presence of external magnetic fields are examined and compared to the electromagnetic properties of pure Cu wires. The findings are discussed on the basis of the microstructural changes during deformation. The current results substantiate that the amount of internal boundaries and the filament spacing have considerable influence on the normal and superconducting properties of Cu-20%Nb
Microchemistry-dependent simulation of yield stress and flow stress in non-heat treatable Al sheet alloys
Deformation texture of aluminium – A grain interaction simulation approach
We present plane strain simulations about the dependence of orientational in-grain subdivision and crystallographic deformation textures in aluminium polycrystals on grain interaction. The predictions are compared to experiments. For the simulations we use a crystal plasticity finite element and different polycrystal homogenization models. One set of finite element simulations is conducted by statistically varying the arrangement of the grains in a polycrystal. Each grain contains 8 integration points and has different neighbor grains in each simulation. The reorientation paths of the 8 integration points in each grain are sampled for the different polycrystal arrangements. For quantifying the influence of the grain neighborhood on subdivision and texture we use a mean orientation concept for the calculation of the orientation spread among the 8 originally identical in-grain orientation points after plastic straining. The results are compared to Taylor-Bishop-Hill-type and Sachs-type models which consider grain interaction on a statistical basis. The progress report reveals five important points about grain interaction. First, the consideration of local grain neighborhood has a significant influence on the reorientation of a grain (up to 20% in terms of its end orientation and its orientation density), but its own initial orientation is more important for its reorientation behavior than its grain neighborhood. Second, the sharpness of the deformation texture is affected by grain interaction leading to an overall weaker texture when compared to results obtained without interaction. Third, the in-grain subdivision of formerly homogeneous grains occurring during straining is strongly dependent on their initial orientation. [...
Simulation of Crystallographic Texture and Anisotropie of Polycrystals during Metal Forming with Respect to Scaling Aspects
We present a method to map and track textures in crystal plasticity finite element simulations using texture components. The use of such functions allows us to conduct forming simulations with full anisotropy update on all size scales ranging from the microscopic to the large-scale regime. The article presents the concept and some applications to the investigation of scaling aspects associated with texture and anisotropy during metal forming
Finite strain crystal plasticity-phase field modeling of twin, dislocation, and grain boundary interaction in hexagonal materials
Studying the effect of grain boundaries in dislocation density based crystal plasticity finite element simulations
AbstractA dislocation density based constitutive model for the face centered cubic crystal structure has been implemented into a crystal-plasticity finite element framework and extended to consider the mechanical interaction between mobile dislocations and grain boundaries by the authors [Ma, A., Roters, F., Raabe, D., 2006a. A dislocation density based constitutive model for crystal-plasticity FEM including geometrically necessary dislocations. Acta Materialia 54, 2169–2179; Ma, A., Roters, F., Raabe, D., 2006b. On the consideration of interactions between dislocations and grain boundaries in crystal-plasticity finite element modeling – theory, experiments, and simulations. Acta Materialia 54, 2181–2194]. The approach to model the grain boundary resistance against slip is based on the introduction of an additional activation energy into the rate equation for mobile dislocations in the vicinity of internal interfaces. This energy barrier is derived from the assumption of thermally activated dislocation penetration events through grain boundaries. The model takes full account of the geometry of the grain boundaries and of the Schmid factors of the critically stressed incoming and outgoing slip systems. In this study we focus on the influence of the one remaining model parameter which can be used to scale the obstacle strength of the grain boundary
Grain boundary mechanics in Crystal Plasticity Finite Element Modeling
Crystal mechanics-FEM 3D EBSD Materials science of arthropods: lobste
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