To promote the application of ultrasonic vibration rock crushing technology in underground rock-drilling engineering, it is necessary to investigate damage and fracture characteristics hard under excitation vibration. In this study, brittle red sandstone was taken as research object, experiments were carried out, macrodeformation samples monitored by strain gauges. The experimental results show...

Metal and semiconductor nanowires (NWs) have been widely employed as the building blocks of the nanoelectromechanical systems, which usually acted a resonant beam. Recent researches reported that nanowires are often polycrystalline, which contains grain boundaries (GBs) that transect the whole nanowire into a bamboo like structure. Based on the larger-scale molecular dynamics (MD) simulations, ...

In this study, we develop a multiscale method to study intrinsic damping in nano-structure. Vibrational frequencies in the range of few GHz are considered. Deformation of the structure, at such high rates of vibration, results in a nonequilibrium phonon distribution. The condition of local equilibrium, as is often used in the existing mutli-scale approaches, no longer remains valid. The nonequi...

hydraulics of stepped spillway is a very complicated phenomenon, as it consists of a two phase flow passing through a set of designed steps. the steps increase the rate of energy dissipation taking place on the spillway face. turbulence, flow aeration and energy dissipation are the main tasks in the design of such structures. this study consists of the experimental investigation to determine th...

Aluminum was a type of hard and soft material, because its high toughness, it easy to generate grinding heat, so polishing relatively difficult polish fire. has been used as processing material due excellent properties such lightness, corrosion resistance, non-magnetism, alloy strength, electrical conductivity, weight, heat dissipation. However, some problems arose when aluminum tubes. Thereby,...

Vibration and dissipation in vibro-acoustic systems can be assessed using frequency response analysis. Evaluating a sweep on full-order model very costly, so order reduction methods are employed to compute cheap-to-evaluate surrogates. This work compares structure-preserving based rational interpolation balanced truncation with specific focus their applicability systems. Such models typically e...