Biomechanical Fundamentals for Designing Machines that Allows Wear Testing

Pulsed laser deposition (PLD) is a novel technique for the deposition of tribological thin films. MoS2 is the archetypical solid lubricant material for aerospace applications. It provides a low coefficient of friction from cryogenic temperatures to about 350°C and can be used in ultra high vacuum environments. The TEM is ideally suited for studying the microstructural and tribo-chemical changes that occur during wear. The normal cross sectional TEM sample preparation method does not work well because the material’s lubricity causes the sandwich to separate. Walck et al. deposited MoS2 through a mesh mask which gave suitable results for as-deposited films, but the discontinuous nature of the film is unsuitable for wear-testing. To investigate wear-tested, room temperature (RT) PLD MoS2 films, the sample preparation technique of Heuer and Howitt was adapted.Two 300 run thick films were deposited on single crystal NaCl substrates. One was wear-tested on a ball-on-disk tribometer using a 30 gm load at 150 rpm for one minute, and subsequently coated with a heavy layer of evaporated gold.

Download Full-text

A Rail Wear Testing Machine

Scientific American ◽

10.1038/scientificamerican07101909-17asupp ◽

1909 ◽

Vol 68 (1749supp) ◽

pp. 17-17

Keyword(s):

Testing Machine ◽

Wear Testing ◽

Rail Wear

Download Full-text

DEVELOPMENT OF A METHODOLOGY FOR SMALL SCALE CASING WEAR TESTING

10.26678/abcm.cobem2019.cob2019-2004 ◽

2019 ◽

Author(s):

Edja Iandeyara Freitas Moura ◽

Juliano Oséias de Moraes ◽

João Pedro Costa Cardoso ◽

Joseir Percy ◽

Sinésio Franco

Keyword(s):

Wear Testing ◽

Small Scale ◽

Casing Wear

Download Full-text

Wear testing of in situ cast AA8011-TiB2 metal matrix composites

Materials Testing ◽

10.3139/120.111386 ◽

2019 ◽

Vol 61 (8) ◽

pp. 779-786

Author(s):

Bellamballi Munivenkatappan Muthami Selvan ◽

Veeramani Anandakrishnan ◽

Muthukannan Duraiselvam ◽

Sivaraj Sundarameenakshi

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Wear Testing ◽

Matrix Composites

Download Full-text

Wear Testing of Inert Anodes for Magnesium Electrolyzers

Metallurgical and Materials Transactions B ◽

10.1007/s11663-007-9025-6 ◽

2007 ◽

Vol 38 (2) ◽

pp. 193-201 ◽

Cited By ~ 5

Author(s):

Joshua Rubenstein ◽

Boyd Davis

Keyword(s):

Wear Testing ◽

Inert Anodes

Download Full-text

Tribological effects of laser surface texturing and residual stress

Industrial Lubrication and Tribology ◽

10.1108/ilt-11-2016-0282 ◽

2018 ◽

Vol 70 (1) ◽

pp. 126-132 ◽

Cited By ~ 7

Author(s):

Shuwen Wang ◽

Feiyan Yan ◽

Ao Chen

Keyword(s):

Residual Stress ◽

Wear Resistance ◽

Friction And Wear ◽

Surface Texturing ◽

Laser Surface ◽

Friction Reduction ◽

Laser Surface Texturing ◽

Wear Testing ◽

Content Type ◽

Surface Textures

Purpose The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces. Design/methodology/approach Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication. Findings Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress. Originality/value The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.

Download Full-text