摘要:

Many experimental works are concerned with the microinvestigation of interface bodies created during the wear process (especially wear particles). Previous works wing STEM have shown that ZDDP wear protection is associated with the structureless nature of wear debris, so that friction-induced amorphization was a key factor to obtain the antiwear conditions.

ISSN:0569-8197    

DOI:10.1080/05698198608981716

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Various ball indentation curves of thin surface films have been obtained experimentally. The normal contact forces (range 10−5— 10N) and the normal displacement (range 1 nm — 1500 nm) between a sphere and a flat plate are continuously investigated during the indentation process. The solids are made in soda-lime or sapphire (Al2O3) and covered by natural pollution layers or Polystyrene layers.

ISSN:0569-8197    

DOI:10.1080/05698198608981717

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

An apparatus to simulate the thermal behavior of a tapered roller bearing was constructed and used to determine tapered roller bearing thermal behavior. Bearing specimens can be loaded axially and/or radially while rotating. Shaft heating is also provided and mechanical losses measured. An infrared scanner and thermocouples allow for temperature measurement. An analytical model of the bearing and bearing/housing system was also developed and is presented. The model is capable of considering various modes of bearing operation. Experimental and theoretical resistances are compared. Typical thermal resistances from shaft to housing were found to be of the order of 1 K/W.Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Tribology Conference in Atlanta, Georgia, October 8–10, 1985

ISSN:0569-8197    

DOI:10.1080/05698198608981718

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The stability of two-axial groove cylindrical journal bearing is improved by milling a step or pressure dam in the upper half surface and by cutting a deep groove or relief-track in the lower half surface. Dynamic analysis of elliptical bearings having similar construction of dam and relief-track, called elliptical pressure dam bearings, has revealed that these bearings are far more stable than ordinary cylindrical, cylindrical pressure dam, elliptical, three-lobe, etc., when supporting a rigid rotor. In this paper, the stability of finite elliptical pressure dam bearings supporting flexible rotors is discussed. The dimensionless rotor flexibilities selected are 0.5, 1.0, 2.0, and 4.0, which cover almost the entire range of practical interest. Effects of design parameters such as vertical preset, L/D ratio, Sommerfeld number, dam location and relief-track width ratio on the stability of these bearings, corresponding to various dimensionless rotor flexibilities are presented in the form of graphs. Also, the effect of turbulence over the entire bearing surface has been included. The bearings have been analyzed by finite-element method.

ISSN:0569-8197    

DOI:10.1080/05698198608981719

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The Static Stress field in and unpressurized, rounded, rectangular, elastomeric seal is examined using both experimental and numerical techniques. A particular stress separation method is successfully employed in the photoelastic study.

ISSN:0569-8197    

DOI:10.1080/05698198608981720

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The effects of geometric change due to wear on the hydrodynamic lubrication of journal bearings are determined theoretically and experimentally in both laminar and turbulent regimes. The steady-state characteristics of the bearings such as film pressure, attitude angle, and Sommerfeld number are analyzed by a semianalytical finite element method for various wear depth parameters, and the theoretical results are compared with the experimental results.

ISSN:0569-8197    

DOI:10.1080/05698198608981721

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The effects of geometric change due to wear on the dynamic characteristics of journal bearings are determined theoretically in both laminar and turbulent regimes. The dynamic characteristics such as spring and damping coefficients and whirl onset speed of a rigid rotor supported by two identical symmetrically aligned bearings are analyzed by a semianalytical finite element method, and the numerical results for various wear depth parameters are indicated in graphical form.

ISSN:0569-8197    

DOI:10.1080/05698198608981722

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor