A two-dimensional computer code, using a multi-material Eulerian finite element formulation, was used to investigate the dynamic micromechanical behavior of granular material. The main results are : The strain-rate insensitive material model provides the correct increase in the dissipated energy with an increase of shock pressure ; An increase in the initial porosity or the pressure results in ...

A layer of granular material on a vertically vibrating sawtooth-shaped base exhibits horizontal flow whose speed and direction depend on the parameters specifying the system in a complex manner. Discrete-particle simulations reveal that the induced flow rate varies with height within the granular layer and oppositely directed flows can occur at different levels. The behavior of the overall flow...

objectives: periodontal pathogens need acidic environments to proliferate in periodontium, and their growth is affected by the salivary flow rate and ph of the mouth. alterations in flow and acidity of saliva have an important effect on oral diseases such as periodontitis. this study was designed to compare salivary ph and flow rate before and after using green tea, black tea and coffee in pati...

background: measuring peak expiratory flow rate has been suggested as an important tool in asthma management by all international guidelines.   objective: studies on various populations have shown considerable variations in normal values of peak expiratory flow rate. since reference standards for iranian children are not available, the present study was performed to establish these standards.  ...

The simulation of high-rate deformation and failure of metals is has traditionally been performed using Lagrangian finite element methods or Eulerian hydrocodes. Lagrangian mesh-based methods are limited by issues involving mesh entanglement under large deformation and considerable complexity in handling contact. On the other hand, Eulerian hydrocodes are prone to material diffusion. In the Mat...

The molar flow rate of carbon has been selected as the processing parameter for comparison for several reasons. The heterogeneous feedstock (air/oxygen and solid material such as biomass) of most gasifiers permits a wide range of total mass feed rate depending on parameters such as the C/O ratio of the solid, the S/C ratio of the gasifier feed, and equivalence ratio of the gasifier. However, th...

Stainlesssteel 403 is high-alloysteelwith good corrosion resistance and it’svery hard material. Abrasive water jet is an effective method for machining, cutting and drilling of stainlesssteel 403. In thispaperweoptimize the metalremoval rate of stainlesssteel 403 in abrasive water jet machining. The MRRisoptimize by usingthreeparameters water pressure, abrasive flow rate and stand-off distance ...

Reid Bailey Department of Mechanical & Aerospace Engineering University of Dayton Dayton, OH 45469-0210 Bert Bras and Janet K. Allen Systems Realization Laboratory G. W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta, Georgia 30332-0405, USA * corresponding author Abstract Continuing with the themes of the first part of this paper, this second part is focused ...