The shear-transformation-zone (STZ) theory of plastic deformation predicts that sufficiently soft, noncrystalline solids are linearly unstable against forming periodic arrays of microstructural shear bands. A limited nonlinear analysis indicates that this instability may be the mechanism responsible for strain softening in both constant-stress and constant-strain-rate experiments. The analysis ...

The effects of nanosecond laser peening on Zr41Ti14Cu12.5Ni10Be22.5 metallic glass were investigated in this study. The peening treatment produced an extra-deep shock-affected zone compared to crystal metal. As opposed to the conventional shear bands, numerous arc shear bands appeared and aggregated in the vertical direction of the laser beam, forming basic units for accommodating plastic defor...

The Tervu breccia zone was formed at the final stages of Late Proterozoic magmatic and metamorphic activity (1.86 Ga ago) healed with granitic material shortly after its formation. agmatites has a sublatitudinal orientation, which is discordant in relation to earlier structures Kurkijoki enderbite Lauvatsaar–Impiniem diorite–tonalite complexes Svecofennian rocks Ladoga region. largest bodies th...

The objective of this study was to develop a numerical model for the prediction of temperature distribution, effective plastic strain distribution, and especially material flow in friction stir welding of copper plates. The DEFORM-3D software was used by incorporating a lagrangian incremental formulation. Threedimensional results of the material flow pattern which were extracted using the point...

The mandrel reaming forging is of great significance to the billeting ring ingot. Through analysis deformation steel ingot mandrel, it concluded that exists in radial, axial and tangential directions, which are similar rigid zone, active plastic zone passive upsetting theory. Numerical simulation methods used analyze verified has a an directions. At same time, reduction rate found greater impac...