A closed-form expression for shear band spacing in strain-hardening, strain-rate-hardening and thermally softening thermoviscoplastic materials is derived by studying the stability of a homogeneous solution of equations governing its simple shearing deformations. The wavelength of the perturbation that maximizes its initial growth rate is assumed to determine the shear band spacing, Ls: The dep...

Friction on biological-like micro-structured surfaces has been investigated. Using a bio-replication technique, complex surface morphologies found in plant leaves were transferred onto viscoelastic substrates. A nano-indenter was modified, permitting in-situ real contact junctions visualisation. Effects of applied normal load and sliding speed the friction response evaluated. All four demonstra...

By means of the three-dimensional discrete element method, we study long-time evolution toward liquefaction state in granular materials composed spherical particles under multidirectional cyclic shearing at constant volume. Extensive simulations were carried out along 1-D linear, 2-D circular/oval, and 8-like shear paths, system was analyzed terms pore pressure, strain, texture. The macroscopic...

The uniformly dispersed carbon nanotubes (CNTs) reinforced 6061Al composites (CNT/6061Al) with different CNT concentrations were fabricated by powder metallurgy technology. It was found that the friction coefficient as well wear rate decreased first and then increased concentration increasing under 15 N 30 N, minimum achieved at of 2 wt%. Adhesive abrasive dominated mechanisms for 1–2 wt% CNT/6...

The study presents the test results of Completely Decomposed Granite (CDG) soil tested under drained triaxial compression, direct shear and simple tests. Special attention was focused on modification upper halve conventional Direct Shear Test (DST) to behave as freehead in movement along with vertical strain control during stage by using Geotechnical Digital System (GDS). show that Free (FDST) ...

This paper is a continuation of two recent publications on crack growth in viscoelastic media. It provides further theoretical results for large strains that enable prediction opening displacement comparison with experimental data the region singularity. In order to achieve good agreement experiment it was necessary account far-field viscoelasticity. Additionally, found deformation throughout s...

In August 1998, an interviewer for an Indonesian news weekly asked Amien Rais, a major figure in national Islamic politics and founder of the National Mandate Party (Partai Amanat Nasional), why he had altered the name of the party from the originally proposed Partai Amanat Bangsa. He replied, “We chose Partai Amanat Nasional because it would be better translated into English as National Mandat...

We carried out pointwise local velocity measurements on 40 mM cetylpyridinium chloride-sodium salicylate (CPyCl-NaSal) wormlike micellar solution using high-frequency ultrasound velocimetry in a Couette shear cell. The studied wormlike solution exhibits Newtonian, shear-thinning and shear-thickening rheological behavior in a stress-controlled environment. Previous rheology, flow visualization a...

We study the shearing of polydisperse and bidisperse media with a size ratio of 10. Simulations are performed with a two-dimensional shear cell using contact dynamics. With a truncated power law for the polydisperse media we find that they show a stronger dilatancy and greater resistance to shearing than bidisperse mixtures. To model additives used to control viscosity we introduce so-called "p...