Rock failure criteria are key input parameters for models designed to better understand the stability of volcanic rock masses. Cohesion and friction angle two defining material variables Mohr-Coulomb criterion. Although these can be determined from laboratory deformation experiments, they rarely reported. Tabulated data rocks, calculated using published triaxial results, show that cohesion decr...

Whether monetary, environmental, or otherwise, the cost of structure is always an important aspect when designing reinforced concrete. A with a low desirable, but other considerations must be made. First and foremost, structures should safe. The two conditions define structural optimization problem that this paper seeks to solve as finding lowest cost, which also Validation concrete in ultimate...

The non-linear mechanical characteristics of tailings under high pressure are the research foundation large-scale dams. Considering stress caused by tailing ponds, consolidated drained triaxial shear tests were carried out. deterioration mechanism mechanics was revealed particle crushing. test results show that sample density has a great influence on volumetric strain low pressure. However, is ...

Local density approximation + Hubbard U (LDA + U) band structure calculations reveal that magnetite (Fe3O4) forms an insulating charge-orbital-ordered state below the Verwey transition temperature. The calculated charge ordering is in good agreement with that inferred from recent experiments. We found an associated t(2g) orbital ordering on the octahedral Fe2+ sublattice. Such an orbital orderi...

A new contact bond model based on the Mohr-Coulomb failure criterion has been implemented in PFC2D to reproduce the behaviour of frictional cohesive (c, φ) geomaterials. According to this model, the bond strength can be clearly divided into two distinct micromechanical contributions: an intergranular friction angle and a cohesive bond force. A parametric analysis has been run to validate the pr...

We propose a trick which enables one to incorporate the Gribov horizon into the Schwinger-Dyson equation in Landau and Coulomb gauge Yang-Mills theory, using the Gribov-Zwanziger framework with the horizon term. We find a family of solutions parameterized by one-parameter wR(0) which was overlooked so far by assuming to be zero implicitly. The family includes both the scaling and decoupling sol...

Charge and orbital ordering in the low-temperature monoclinic structure of magnetite (Fe3O4) is investigated using the local spin density approximation with Coulomb interaction correction method. While the difference between t(2g) minority occupancies of Fe(2+)(B) and Fe(3+)(B) cations is large and gives direct evidence for charge ordering, the screening is so effective that the total 3d charge...

An arc-length equilibrium path-following method is proposed for two-dimensional quasi-static frictional contact problems. We consider the Coulomb friction law as well as geometrical nonlinearity. Incorporating a criterion of maximum dissipation of energy, we propose a formulation as a mathematical program with complementarity constraints (MPCC) in order to avoid unloading solutions in which mos...

In this paper, dynamic and stability analysis of a flexible cam-follower system is investigated. Equation of motion is derived considering flexibility of the follower and camshaft. Viscous and Coulomb frictions are considered in the rocker arm pivot. The normalized equation of motion of the system is a 2nd- order differential equation with periodic coefficients.&#10Floquet theory is employed to...