Accession Number : AD0675138

Title :   ULTRAHIGH VACUUM ADHESION OF COMMINUTED BASALT ROCK TO METALS.

Descriptive Note : Technical rept.,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Selheimer,Howard E. ; Johnson,Stewart W.

Report Date : SEP 1968

Pagination or Media Count : 12

Abstract : The strength and nature of the forces of adhesion between soils of basaltic composition and 304 stainless steel and 2024 T-4 aluminum in an ultrahigh vacuum of 10 to the minus 10th power torr were determined experimentally. For fine grained soils, forces of up to 495 dynes/sq cm were measured. These forces are consistent with values of Van der Waals forces calculated using a Lifshitz expression when the thickness and attenuating effect of the metallic oxides are taken into account. The possibility of electrostatic and chemical bonds being present could not be completely eliminated, and the likely existence of electrostatic bonds is demonstrated in some cases. Possible implications for lunar surface operations are discussed. (Author)

Descriptors :   (*MOON, SOILS), (*METALS, ADHESION), VACUUM, SURFACE PROPERTIES, BASALT, STAINLESS STEEL, THICKNESS, OXIDES, ALUMINUM COMPOUNDS, PARTICLES, ELECTROSTATIC ACCELERATORS

Subject Categories : Astronomy
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE