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Henan Tongwei Medical Equipment Co., LtdCall us : +86 − −19139704654 // Email us : [email protected]
Henan Tongwei Medical Equipment Co., LtdCall us : +86 − −19139704654 // Email us : [email protected]
The surfaces feature high contact angles and ultralow sliding angles for various nonpolar liquids excellent transparency and chemical and environmental stability The microstructure and superoleophobicity of the surfaces can be regulated simply by the water concentration in toluene used during the coating procedure
Various superhydrophobic films having different surface roughnesses were prepared and the relationships between the sliding angle the contact angle and the surface structure were investigated In the highly hydrophobic region the sliding angles
Orientation effects of micro-grooves on sliding surfaces Sihuan Yuan Wei Huang Xiaolei Wangn Nanjing University of Aeronautics and Astronautics 29# Yudao Street Nanjing 210016 China article info Article history: Received 5 August 2010 Received in revised form 4 April 2011 Accepted 11 April 2011 Available online 20 April 2011 Keywords
Even worse our entire understanding of the fundamental mechanisms of friction on the atomic scale is still relatively limited since most macroscopic and microscopic frictional effects are usually dominated by the influence of wear plastic deformation lubrication surface roughness and surface asperities Macroscopic friction experiments are therefore difficult to analyse in terms of a
All friction tests with different surface topographies were conducted using an alternative tribometer simulating the pure sliding process in the wheel-rail contact The Hertzian pressure was maintained at 1 000 MPa with two levels of sliding velocity (20 mm/s and 80 mm/s) This study resulted in five main findings First the initial surface topographies seemed to have a significant effect on
Read Effects of 6 Months of Aging in Water on Hardness and Surface Roughness of Two Microhybrid Dental Composites Journal of Prosthodontics on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips
Balaceanu et al 160 evaluated the corrosion resistance tribological adhesion hardness and surface roughness properties texture chemical bonding phase and elemental compositions of super-hard ZrCN based coatings deposited on high speed steel plain carbon steel and Si substrates by a cathodic arc method Al and Ti were added to the base coatings to check for their effects on the above
The effect of surface roughness and topographical orientation on friction and wear has been investigated for diamond like carbon (DLC) coated and uncoated steel surfaces with three levels of surface roughness in the range of 0 004–0 11 μm Ra value and with topographical orientations at 0 45 and 90 angles from grinding marks
The roughness effects are important if one surface is compliant (such as fibers sliding on a hard surface) or one surface is much rougher than another surface with comparable hardness Also for micro-scale friction measurements using a sharp tip on a rough surface This mechanism generally plays an insignificant role in engineering applications
general effects of speed feed depth of cut and nose radius Receiving serious attention for many years surface roughness has formulated an important design feature in many situations such as parts subject to fatigue load precision fit fastener hole and aesthetic requirements In addition to tolerances surface roughness imposes one of the most critical constraints for the selection of
Research Article COMPARATIVE STUDY OF THEORETICAL AND PRACTICAL SURFACE ROUGHNESS PROFILES PRODUCED IN TURNING M Ramalinga Reddy 1 LateV S R Murthy 2 P Ravi Kumar 3 G Krishna Mohan Rao 4 * Address for Correspondence 1Professor Department of Mechanical engineering CMR College of Engineering Technology Hyderabad
but this leads to a continuous gradation in surface roughness as the crack propagates Consequently the cyclic load amplitude was reduced continuously during crack growth so as to maintain constant the change in stress intensitv factor AK near the crack tip Three values of Ak were chosen and the cracks were grown to depths of 5 10 in the range 20-60 MN or 15 mm The cracks extended through
10 1016/S0043-1648(98)00148-3 10 1016/S0043-1648(98)00148-3 2020-06-11 00:00:00 The time-dependent variations in the dry sliding wear rate and friction of PEEK (450G and 100P) and carbon fibre-bonded PEEK (APC2) on stainless steel ( 316S 16) have been investigated and the evolution of wear scratches measured with optical profilometry A three-pin-ondisk tester was u~d operating at 0 18 m s
numerical model to evaluate these effects including substrate roughness patterning curvature and deformability The approach is validated by comparing its predictions with classical thin film peeling theoretical results and is then used to predict the effects of substrate properties These results can provide deeper insight into experiments and the developed model can be a useful tool to
The effects of crack surface friction 197 components of the displacement of a point on the interface (this phenomenon is referred to as dilatancy) and can therefore give rise to mode I stress intensity factors even when the applied loading is apparently mode II
Tool wear Tool life / Machinability / Surface roughness CRATER WEAR • Crater wear consists of a concave section on the tool face formed by the action of the chip sliding on the surface • Crater wear affects the mechanics of the process increasing the actual rake angle of the cutting tool and consequently making cutting easier • At the same time the crater wear weakens the tool
Functional Coatings by Incorporating Nanoparticles Abstract Use of nanoparticle addition in coatings has been described to formulate self-healing and antifouling coatings The first step in both these cases was to create a hydrophobic surface for which a highly reactive fluoro silane was used The second property in each case was achieved by the addition of nano-particles In self-cleaning
surface roughness using various grades of SiC sand paper (#800P-#4000P) Each bearing was run-in at sliding speed of 0 06 m/s (40 rpm) for four hours Dynamic friction curves were obtained with variation in speed for each material and shaft roughness combinations at different time intervals during running-in
We term hydrophobic these situations in which obtuse angles are observed Another aim of this review is to show how one can take advantage of the surface roughness for filling the (large) gap existing between 120 and (nearly) 180 thus generating ultrahydrophobic behaviors of obvious practical interest (water repellency) 1 2 Ideal Wicking Materials are often not fully solid yet are
sliding direction This is demonstrated by Patton (1966) in laboratory experiment on 'saw-tooth' rock samples Dilation of the rock samples were due to effects of the surface sliding along the inclined surfaces Estimation of peak friction angle as a function of normal stress can be described as: τ
Nanoscale Surface and Interface Mechanics of Elastic-Plastic Media with Smooth Patterned and Rough Surfaces By Xi Yin A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Engineering – Mechanical Engineering in the Graduate Division of the University of
Effects of the Surface Roughness on Sliding Angles of Water Droplets on Superhydrophobic Surfaces of the surface roughness on sliding angles on the basis of a new theoretical model Background Contact Angle on a Rough Solid Surface The contact angle ı of a liquid droplet on a flat solid surface is given by Young's equation eq 2 where SL SV and LV are the interfacial free
Effects of Surface Structure on the Hydrophobicity and Sliding Behavior of Water Droplets Langmuir 2002 18 (15) 5818-5822 DOI: 10 1021/la020088p P Roura and J Fort Comment on "Effects of the Surface Roughness on Sliding Angles of Water Droplets on Superhydrophobic Surfaces"
Thereby water contact angles of the coatings were almost equivalent The water droplet sliding velocity increased continuously with increasing pattern size Anisotropic sliding velocity was observed on the surface suggesting di?erent pinning e?ects The sliding motion of water droplets on the gradient surface with changing hydrophilic region size de?ects against the downward direction The de
The investigation of the formation mechanisms of sliding surfaces in different types of landslides is an open problem of scientific research Especially for the catastrophic landslides that have a major impact on human activities the effect of heavy rain is very important in studying the stability of slopes prone to these huge movements of geological materials
A multi-scale roughness (micro-nano roughness) was found and this enhanced the forced wetting durability via a superhydrophobic effect on the surface which was stable even after repeated wetting cycles The hydrophobic effect of this approach was higher compared to that of plasma modified surfaces with their micro-scale modification
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