Abstract When granular assemblies are subject to external loads or displacements, particles interact with each other through contact and may exhibit translations rotations. From a micromechanical perspective, particle rotations an essential mechanism influencing the macroscopic behavior of materials. In this study, biaxial shearing tests were conducted on dual-sized circular at different confin...

Nonequilibrium molecular dynamics simulations are reported at different strain rates (gamma;) for a shearing atomic fluid interacting via accurate two- and three-body potentials. We report that the hydrostatic pressure has a strain-rate dependence of gamma;(2), in contrast to the gamma;(3/2) dependence predicted by mode-coupling theory. Our results indicate that the pressure and energy of real ...

In Dynamic Electronic Speckle Pattern Interferometry (DESPI), deformation analysis could be done for successively acquired frame data of interfering speckle patterns with no additional frames like phase shifting speckle patterns. Our final goal is to obtain a temporally varying process of two-dimensional strain field. Two normal strains and shearing strain are derived by numerical derivatives o...

We study the shearing motion of a slab consisting of an incompressible nonlinearly viscoelastic material of diierential type. We describe reasonable general constitutive restrictions that ensure that the strain is bounded during any motion lasting a nite length of time. We brieey sketch how this simple property, which is easily veriied, ensures that the governing initial-boundary-value problems...

Shear bands generally initiate strain softening and result in low ductility of metallic glasses. In this Letter, we report high-resolution electron microscope observations of shear bands in a ductile metallic glass. Strain softening caused by localized shearing was found to be effectively prevented by nanocrystallization that is in situ produced by plastic flow within the shear bands, leading t...

In the present investigation, two dimensional elastoplastic finite element analysis was conducted to assess the deformation characteristics of Al 1100 alloy during continuous confined strip shearing (C2S2) process. The results of simulations showed that the plastic strain distribution across the deformed sample is non-uniform irrespective of the amount of friction and C2S2 die angle. The most u...

The mechanical response of clay mass can be significantly affected by the distribution and arrangement of the particles and the interaction between them. A series of compression and extension tests under drained and undrained conditions were performed on normally consolidated and heavily over-consolidated clay specimens with different microfabric. The experimental data indicates strong influenc...

workspace analysis is one of the most important issues in the robotic parallel manipulator design. ‎however, ‎the unidirectional constraint imposed by cables causes this analysis more challenging in the cabledriven redundant parallel manipulators. controllable workspace is one of the general workspace in the cabledriven redundant parallel manipulators due to the dependency on geometry parameter...