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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Frictional transition effects in unlubricated sliding

Pomeroy, Richard James January 1963 (has links)
The object of this research was to study the effect of initial surface -finish and finish mark orientation on intermetallic friction under unlubricated sliding contact conditions. The metal used was mild steel and the parameters investigated were sliding speed and load. Qualitative assessments of wear were also made. The basic apparatus consisted of a rotating disc and an elastically supported slider. The disc and slider each had the same-initial surface finish. Six different surface finishes were examined ranging in roughness from a peak to valley distance of 6.9 thousandths of an inch to 35 microinches R.M.S. Speed was varied from 1.25 to 60 inches per second and normal load from 1.025 to 3.075 pounds. No significant correlation was found, between the theory of Ernst and Merchant and the experimental results. Friction was more dependent on surface parameters affecting load concentration than, on the particular details of each surface asperity. The effects of finish mark orientation were only significant when they produced appreciable load concentration. Friction was found to increase as "wear-in" progressed and remain approximately constant once wear-in was complete. No relation between friction and velocity could be deduced. Wear-in was found to be influenced by initial surface geometry. The sufaces which gave high load concentration at sharp protuberances "wore-in" more quickly than those-with low load concentration. Smooth compatible surfaces which required little surface alteration also wore-in rapidly. Wear debris was found to influence both friction and wear-in. Evidence of mechanical working of debris between the surfaces was obtained. A quasi-harmonic oscillation of the slider supporting system was observed to result from wear-in. The frequency of vibration was a function of disc speed and load. The amplitude of the vibration increased linearly with disc speed up to a maximum value. The magnitude-of this maximum was dependent on normal load. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate
52

A study of grease lubricated bearings

Sullivan, Francis Joseph. January 1941 (has links)
LD2668 .T4 1941 S91 / Master of Science
53

Piston ring friction

Chang, Clarence T January 1982 (has links)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING / Bibliography: leaf 68. / by Clarence Teh-Ching Chang. / M.S.
54

Aspects of dental air turbine handpiece lubricants and sterilization

Pong, Sze-ming. January 1998 (has links)
Thesis (M.D.S.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 96-105) Also available in print.
55

Constitutive laws for gas lubricated triboelements

Miller, Bradley A. 12 1900 (has links)
No description available.
56

Analysis of a mechanical seal with deep hydropads

Hegab, Hisham 05 1900 (has links)
No description available.
57

Temperature measurements in tribocontacts by means of infrared radiometry

Griffioen, Jan Arie 08 1900 (has links)
No description available.
58

The effects of motor oil additives on contact potential difference

Thomas, Terry Howard 08 1900 (has links)
No description available.
59

Polymer degradation in sliding elastohydrodynamic lubrication

Walker, David Leroy 12 1900 (has links)
No description available.
60

Application of a contact potential difference probe to detection of nanometer-scale lubricant on a hard disk

Yano, Daisuke 05 1900 (has links)
No description available.

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