Historically, the design of the in-stope pillar in underground excavations has been based on empirical formulae and numerical modelling. Although these design methods have been extensively applied in several gold mines in South Africa, rockburst, in-stope pillar burst/failure are continuously reported as the major problem faced by mines. Therefore, this study attempts to compare the performance...

A number of RC bridge columns which are similar with the columns which suffered extensive damage during the 1995 Kobe, Japan earthquake due to premature shear failure resulting from the termination of longitudinal reinforcements with insufficient development and the lack of shear reinforcements still exist. To improve the seismic performance, some of them were retrofitted. Evaluation of shear s...

To reveal the strengthening mechanism and re-failure of grouting on fractured rock, variable-angle shear tests, real-time acoustic emission (AE) tests VIC-3D (non-contact full field strain measurement system) were carried out intact red sandstone (IRS) grouting-reinforced body (GRBFRS). The results show that peak strength IRS GRBFRS decreases with increase angle. Grouting reinforcement mainly i...

Abstract : The effect of a bond failure and its extent is studied on stress concentration in long fibers as well as stress distribution in short fibers and their surrounding matrix bays. The material is assumed to be a finite width hybrid composite lamina which is subjected to a tensile load of magnitude "P" at infinity. The surrounding matrix is assumed to take only shear (shear-lag theory). T...

Meshfree Galerkin approximations in both two and three dimensions have been used in simulations of dynamic shear band propagation in an asymmetrically impact-loaded prenotched plate. Failure mode switching and failure mode transitions, which have been reported experimentally, are replicated in numerical computations. For intermediate impact speed (25 m=s < V 6 30 m=s), the numerical results sho...

BACKGROUND The lumbar spine may experience significant shear forces during occupational tasks due to the force of gravity acting on the upper body when bending the trunk forward, or when performing tasks involving pushing or pulling. Shear force limits of 1000 N and 500 N have been recommended by previous authors for maximum permissible limit and action limit, respectively. METHODS The presen...

Sea ice contains flaws including frictional contacts. We aim to describe quantitatively the mechanics of those contacts, providing local physics for geophysical models. With a focus on the internal friction of ice, we review standard micro-mechanical models of friction. The solid’s deformation under normal load may be ductile or elastic. The shear failure of the contact may be by ductile flow, ...

0749-6419/$ see front matter 2010 Elsevier Ltd doi:10.1016/j.ijplas.2010.02.001 * Corresponding author. E-mail addresses: [email protected] (K. Kang We present molecular dynamics simulations of [110]-oriented Si nanowires (NWs) under a constant strain rate in tension until failure, using the modified embedded-atom-method (MEAM) potential. The fracture behavior of the NWs depends on both tempe...