Accession Number : AD0769775

Title :   Wear Particle Formation Mechanisms.

Descriptive Note : Annual rept. Sep 72-Sep 73,


Personal Author(s) : Koba,Harry ; Cook,Nathan H. ; Joshi,Deep C.

Report Date : SEP 1973

Pagination or Media Count : 78

Abstract : The report describes the wear found in a lightly loaded, short duration, lubricated bronze on steel sliding system. Examination with a scanning electron microscope indicates that the surface of both bronze and steel are capable of very large plastic deformation. Evidence of a void formation/crack propagation mechanism, operating below the surface to produce loose wear particles was found. Wear particles precipitated out of the lubrication oil by a Ferrograph Analyzer and examined under high magnification showed considerable difference in size and shape to those which have been reported in the literature. Particle shape correlated well with a sub-surface void formation/crack propagation mechanism. A material transfer process of bronze to steel was found to be inconsistent with that predicted by the adhesion wear theory. Appendix one contains a progress report on the analysis of sliding contact of rough surface. (Modified author abstract)

Descriptors :   (*Friction, *Metals), (*Wear, Metals), Sliding, Crack propagation, Surfaces, Bronze, Steel, Lubrication, Particles, Interfaces, Strain(Mechanics), Hardness, Abrasion, Polishes

Subject Categories : Metallurgy and Metallography
      Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE