Gas-phase velocity fluctuations in fixed particle beds and freely evolving suspensions are quantified using particle-resolved direct numerical simulation (PR-DNS). The flow regime corresponds to homogeneous gas-solid systems typically encountered in fluidized bed risers, with high solid to gas density ratio and particle diameter being greater than the dissipative length scales. The contribution...

Shallow and deep seated landslides in natural slopes are often induced by rainfall. The cause of the failure is usually considered to be due decrease effective confining stress a suction loss water infiltration. However, rainwater infiltrates into slope surface resulting reduction shear strength soil deformation may occur even without significant change stress. It thus essential examine charact...

Natural clays exhibit a significant degree of anisotropy in their fabric, which initially is derived from the shape of the clay platelets, deposition process and one-dimensional consolidation. Various authors have proposed anisotropic elastoplastic models involving an inclined yield surface to reproduce anisotropic behavior of plastic nature. This paper presents a novel constitutive model for s...

The effects of hydrostatic extrusion on particle cracking and on the subsequent tensile properties of some prototypical particlereinforced metal–matrix composites are investigated. In most cases, tensile failure occurs through a plastic instability in accordance with the Considere criterion for necking. The corresponding failure strain is therefore dictated by the global flow and hardening char...

Extensive numerical simulations have been done to study, generation, propagation and decay of deviatoric stress waves induced by a high intensity uranium beam in a wheel shaped solid graphite Super–FRS production target. Maximum beam intensities that the target can tolerate using different focal spot sizes that are determined by requirements of good isotope resolution and transmission of the se...

A phenomenological constitutive relation using the conventional J2-fiow isotropic hardening yield function as well as a threshold shear stress based yield function that governs a 'directionally preferred plastic component' of shear strain, developed by the authors in an earlier work, is used for the simulation of the shear band formation. The constitutive relation which is expressed as an expli...

Abstract This paper presents a novel semi-implicit scheme for elastodynamics and wave propagation problems in nearly truly incompressible material models. The proposed methodology is based on the efficient computation of Schur complement mixed displacement-pressure formulation using lumped mass matrix displacement field. By treating deviatoric stress explicitly pressure field implicitly, critic...

Conventional triaxial tests on peats are strongly criticised due to the very high shear strength parameters obtained from standard data elaboration, leading unrealistic factors of safety when used in geotechnical design and assessment. Various operational approaches have been proposed literature overcome this difficulty; however, they seem lack consistent mechanical background. Some issues rela...

Abstract To study the combined effects of freeze–thaw cycles and chemical corrosion on deterioration mechanism triaxial mechanical properties sandstone in cold regions, compression tests were carried out homologous specimens after action acidic, alkaline or neutral solution cyclic action, by taking pH value hydrochemical number as control parameters. The failure mode is shear-slip failure, devi...