... between inelastic phenomena such as cracking, splitting, and frictional slipping occurring on planes of various orientations though not the interactions at a distance. To avoid spurious mesh sensitivity due to softening, the crack band model is adopted. Its band width, related to the material...

... nanocomposites nanoparticles phonons silicon compounds slip soft modes thermal conductivity New developments in high temperature ceramic materials technology have focused on obtaining nanocomposite materials with nanoscale features for an optimal control of thermal and mechanical properties. One...

... model considers the deformation mechanisms by the theory of crystallographic slip and incorporates the effects of intracrystalline debonding and fragmentation. The model generated within this framework is used to simulate uniaxial tension and simple shear of high density polyethylene. The predicted...

..., nonuniform, and total strain of aluminum when compared with pure aluminum. An attempt has been made in this study to inter-relate the enhanced tensile response of aluminum with the ability of SiC nanoparticles to homogenize the slip process and to delay void initiation and coalescence during tensile loading...

...T. M. Hatem; M. A. Zikry A multiple-slip dislocation-density-based crystalline formulation, specialized finite-element formulations, and Voronoi tessellations adapted to martensitic orientations were used to investigate dislocation-density activities and crack tip blunting in high strength...

.... 02 02 2009 03 04 2009 27 08 2009 bicrystals copper crystal microstructure dislocations grain boundaries impurities molecular dynamics method nanostructured materials plastic deformation plasticity slip stress-strain relations grain boundaries atomistic simulation...

... grains are held responsible for crack initiation in dwell fatigue. An accurately calibrated and experimentally validated crystal plasticity finite element (FE) model is employed for predicting slip system level stresses and strains. Vital microstructural features related to the grain morphology...

...Michel G. Darrieulat; Asdin Aoufi The present article addresses the following question: How is it that shears are so common in the plastic deformation of metallic alloys? An answer is sought in a geometric description of the shear flow when the deformation is produced by slip systems gliding...

...Antoinette M. Maniatty; David J. Littlewood; Jing Lu In order to better understand and predict the intragrain heterogeneous deformation in a 6063 aluminum alloy deformed at an elevated temperature, when additional slip systems beyond the usual octahedral slip systems are active, a modeling...

...–Needleman model. The simulations show a distinct slip band forming at about 55 deg with respect to the notch line corresponding to slip on ( 1 1 ¯ 1 ) [ 011 ] system, which corroborates well with experimental data. Furthermore, two kink bands occur at about 45 deg and 90 deg with respect to the notch line...

...L. Westfall; B. J. Diak; M. A. Singh; S. Saimoto Crystalline defects other than the essential dislocations are produced by dislocation intersections resulting in debris, which can transform into loops, point defects, and∕or nanovoids. The stress concentrations ahead of slip clusters promote void...

... computerised tomography flaw detection magnesium alloys nucleation slip superplasticity voids (solid) superplasticity damage nucleation coalescence X-ray tomography Superplasticity is the ability for a given material to exhibit particularly large elongations to fracture for appropriate...

... in a scenario where a mechanical twin interacts with a grain boundary. This correlation (quantified using a fracture initiation parameter or fip) was based only on the geometry of the Burgers vectors as they are related to slip transfer across the grain boundary and the Mode I type opening force experienced...

... incorporated in digital microstructures which represented virtual specimens composed of finite element-discretized crystals. A continuum slip-polycrystal plasticity model was coupled with the digital microstructures to study the differences in roughening seen in specimens deformed along the rolling direction...

... difference between cyclic load on the specimen and tangential force on the fretting pad with cylinder-on-flat contact configuration under partial slip condition. Two axial stress ratios were used. The relative slip range and tangential force range were related to each other and this relationship...

.... Only the grain boundary sliding model, developed recently for solders, predicted creep-fatigue lives with a small scatter. 21 04 2003 11 05 2005 tin alloys silver alloys creep fatigue solders ductility slip Solder connections in electronic devices are exposed to low...

... are appropriately investigated. It is demonstrated that the model can correctly describe the overall and local damaged behavior of polycrystals. micromechanics stress-strain relations fracture mechanics fatigue internal stresses tensile testing compressive testing elasticity grain boundaries slip...

... end large deflections from a path perpendicular to the applied load were observed. Intergranular cracks were found to prefer high angle boundaries, whereas transgranular cracks had a tendency to nucleate and display stage I growth along slip traces of systems with high Schmid factors, as determined...

... in the macroscopic level while a factor, based on the crystallographic approach, accounts for the global state of micro slip on the crystal. The combination of both elements defines the so-called “combined approach” (CA). This paper presents the development of the theory and its applications to the determination...

... dislocation activity (glide of dislocation on favorable slip plans and dynamic evolution of the dislocation density) which is dominant in coarse grained materials and (2) the emission of dislocations by the grain boundaries which. Typically occurs at smaller...