THE EFFECT OF VACUUM ON THE SHEARING RESISTANCE OF IDEAL GRANULAR SYSTEMS

Abstract

Frictional behavior of ideal individua particle media was investigated in connection with lunar soil applications. Several conclusion seem justified: (1) The shear strength of an ideal granular system is a function of the atmosphere. Specifically, it is concluded that very low air pressure causes a decrease in thick ness of the adsorbed surface films resulting in increased grain to grain friction and shearing resistance. (2) The relationship between inter particle friction and shearing resistance is subject to theoretical analysis that can be reason ably substantiated. (3) It is reasonable to expect that very high vacuum conditions will cause a significant increase in coefficient of friction of some, if not all, rock forming minerals. (4) Size, as such, has no effect on the shear strength of granular materials. (5) At a given absolute density, a uniform material has, in general, a greater shearing resistance than a well graded material.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1963
Accession Number
AD0416309

Entities

People

  • Gerald D. Sjaastad

Organizations

  • Princeton University

Tags

Communities of Interest

  • Air Platforms
  • Counter WMD
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Pressure
  • Chemistry
  • Civil Engineering
  • Construction
  • Engineering
  • Engineers
  • Friction
  • Grain Size
  • Granular Materials
  • High Vacuum
  • Materials
  • Materials Science
  • Measurement
  • Mechanics
  • Particle Size
  • Three Dimensional

Readers

  • Geotechnical Engineering.
  • Theoretical Analysis.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).

Technology Areas

  • Space
  • Space - Hall-Effect Thruster