TaN films with different N2 partial pressure were deposited on 304 stainless steel using the magnetron sputtering method. The effect of gas pressure on the mechanical property, morphology and phase structure of the films is investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), microhardness testing, friction coefficient measurements, and wear mechanism study. The XRD results c...

Pressure systems are widely used in almost all areas of the public economy related to liquids. For example, at present, supply drinking water populated world, heating systems, agriculture, cleaning basins from muddy flows, mining industry, construction, raising chemical process moving flows same speed, pipeline viscous efficient being for transportation and many other purposes. Recently, plasti...

Friction measurement is one of important and interesting problems in the study of handle properties of fabrics. Different methods have been developed for measuring friction, such as sliding, KES and cyclic testing method. In this research, considering the possibilities of varying conditions in measuring friction, a new instrument by which the bottom surface of fabric can be moved and the top sl...

In this paper, torsion extrusion (TE) process on 1050 aluminum alloy was investigated by simulation as a severe plastic deformation (SPD) method and the effects of friction coefficient, angular velocity of the rotating die and punch speed on maximum punch force were studied. A finite element (FE) model was developed to simulate the TE process via DEFORM software. The FE results were validated co...

The coefficient of friction (COF) is one the core factors in evaluation brake system performance. It challenging to predict COF, since it strongly influenced by several parameters such as contact pressure (p), slip rate (v) and temperature (T) that depend on driving conditions. There a need for better models describe how varies under different purpose this research study possibility using 3D pv...

We develop a numerical scheme to determine which planar snake motions are optimal for locomotory efficiency, across a wide range of frictional parameter space. For a large coefficient of transverse friction, we show that retrograde traveling waves are optimal. We give an asymptotic analysis showing that the optimal wave amplitude decays as the -1/4 power of the coefficient of transverse frictio...