DETERMINATION OF ACTUAL SURFACE CONTACT AREAS ON TRANSPARENT MODELS,

Abstract

A new optical method for determining the forms and dimensions of the projections of actual contact areas in coarse surfaces on a friction plane is developed. This method permits a visual observation of actual contact areas in models with stationary as well as movable surfaces, and allows a determination to be made of the number of contact spots, dimension of separate spots, and the overall actual areas of contact. As a result of applying this method, it is determined that the surfaces make actual contact on very small areas grouped in a small number of zones. The main part of the nominal areas of contact does not bear any stress. The actual contact surface comprises a value less than 1% of the nominal surface. The actual contact area basically increases with the increase of the stress, causing an increase in the number of contact points. The diameter of the spot increases insignificantly. The average dimension of a spot comprises a value to the order of 0.02 sq.mm. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 19, 1964
Accession Number
AD0603492

Entities

People

  • E. M. Shvetsova

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acquisition
  • Data Acquisition
  • Diameters
  • Friction
  • Geometry
  • Mathematics
  • Observation
  • Stationary

Readers

  • Mathematics or Statistics
  • Systems Analysis and Design
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).