Browsing by Subject "Friction"

Conference Object

Active earth thrust on walls supporting granular soils: Effect of wall movement

Loukidis, D.; Salgado, R. (IOS Press, 2013)

The methods currently used in the design practice of retaining walls supporting granular soils (sand, gravel, silt, and their mixtures) assume that the soil friction angle and, consequently, the active earth pressure ...

Article

Adaptive VN/Ag nanocomposite coatings with lubricious behavior from 25 to 1000 °c

Aouadi, S. M.; Singh, D. P.; Stone, D. S.; Polychronopoulou, K.; Nahif, F.; Rebholz, Claus; Muratore, C.; Voevodin, A. A. (2010)

A two-phase nanocomposite coating that consists of inclusions of silver in a vanadium nitride matrix (VN/Ag) was investigated as a potential adaptive coating with a reduced friction coefficient from 25 to 1000 °C. This ...

Article

Comparative tribology studies of hard ceramic and composite metal-DLC coatings in sliding friction conditions

Voevodin, A. A.; Rebholz, Claus; Matthews, A. (1995)

The design of anti-friction coatings able to perform well in different wear conditions without lubricants requires a combination of adequate hardness and toughness, good adhesion, a low friction coefficient and a low wear ...

Article

Composite DLC-metal/metal-carbide coatings produced by electron enhanced unbalanced magnetron sputtering

Rebholz, Claus; Ziegele, H.; Voevodin, A. A.; Schneider, J. M.; Matthews, A. (1997)

Composite coatings consisting of metal containing diamond like carbons were produced by unbalanced magnetron sputtering in a closed field magnetic configuration. Targets of Pta and W were poisoned with acetylene during the ...

Article

Deposition and nanotribological characterization of Sub-100-nm thick protective Ti-based coatings for miniature applications

Polychronopoulou, K.; Lee, J.; Tsotsos, C.; Demas, N. G.; Meschewski, R. L.; Rebholz, Claus; Polycarpou, A. A. (2011)

Ti-based protective thin films with thicknesses below 100 nm, intended for miniature applications were deposited using physical vapor deposition magnetron sputtering. X-ray diffraction (XRD), scanning electron microscopy, ...

Article

Enhancing the nanoscratch resistance of pulsed laser deposited DLC films through molybdenum-doping

Constantinou, M.; Pervolaraki, M.; Koutsokeras, L.; Prouskas, C.; Patsalas, P.; Kelires, P.; Giapintzakis, John; Constantinides, G. (2017)

Pulsed laser deposition was used to grow DLC and molybdenum-doped DLC (DLC:Mo) films, with metal contents up to 3.2 at.%, on silicon substrates. The microstructural details of the films were investigated using X-ray ...

Article

Layered atomic structures of double oxides for low shear strength at high temperatures

Stone, D.; Liu, J.; Singh, D. P.; Muratore, C.; Voevodin, A. A.; Mishra, S.; Rebholz, Claus; Ge, Q.; Aouadi, S. M. (2010)

Double oxide phases combining a transition metal and a noble metal have recently become a subject of investigation as solid lubricant materials for high-temperature tribological applications. Here, we study the changes in ...

Article

Modelling and Simulation of Bolted Joints under Harmonic Excitation

Oldfield, M.; Ouyang, H.; Mottershead, J. E.; Kyprianou, Andreas (2003)

Bolted metal joints under harmonic loading exhibit hysteretic behaviour. This is the major source of damping in frame structures with bolted joints, since the material damping of these structures is very small. In this ...

Article

Multilayer composite ceramic-metal-DLC coatings for sliding wear applications

Voevodin, A. A.; Schneider, J. M.; Rebholz, Claus; Matthews, A. (1996)

The design of anti-friction coatings able to perform well in different wear conditions without lubricants requires a combination of adequate hardness and toughness, good adhesion, a low friction coefficient and a low wear ...

Article

Nanostructure, mechanical and tribological properties of reactive magnetron sputtered TiCx coatings

Polychronopoulou, K.; Rebholz, Claus; Baker, M. A.; Theodorou, L.; Demas, N. G.; Hinder, S. J.; Polycarpou, A. A.; Doumanidis, C. C.; Böbel, K. (2008)

This study describes the correlation between microstructure, mechanical and tribological properties of TiCx coatings (with x being in the range of 0-1.4), deposited by reactive magnetron sputtering from a Ti target in ...

Article

Room temperature synthesis and high temperature frictional study of silver vanadate nanorods

Singh, D. P.; Polychronopoulou, K.; Rebholz, Claus; Aouadi, S. M. (2010)

We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly β-AgVO3) by a simple wet chemical route and their frictional study at high temperatures (HT). The sudden mixing of ammonium ...

Conference Object Open Access

A study of the pictorial representations of the phenomenon of friction on the internet

Ovadias, Savvas; Halkia, Krystallia (Department of Educational Sciences, University of Cyprus, 2003)

Τhe aim of this work is to study the ways in which a natural phenomenon of daily life, such as friction, is depicted on the Internet,. The Internet, apart from being an important source of information, can be developed so ...

Article

Textured VN coatings with Ag3VO4 solid lubricant reservoirs

Luster, B.; Stone, D.; Singh, D. P.; Baben, M. to; Schneider, J. M.; Polychronopoulou, K.; Rebholz, Claus; Kohli, P.; Aouadi, S. M. (2011)

Silver oxovanadate powders were produced using a low temperature hydrothermal synthesis method. X-ray diffraction (XRD) and Raman microscopy revealed the formation of the α-Ag3VO4 phase, and differential scanning calorimetry ...

Article

Wear resistant composite coatings deposited by electron enhanced closed field unbalanced magnetron sputtering

Voevodin, A. A.; Rebholz, Claus; Schneider, J. M.; Stevenson, P.; Matthews, A. (1995)

There is presently considerable interest in wear resistant coatings produced using closed field unbalanced magnetron sputtering technology. For example, layered films of diamond-like carbon (DLC) with tungsten or titanium ...