A Study of Surface Damage at Low-Amplitude Slip.
Abstract
The effect of extremely small slip amplitudes (0 to 5 micron) on transitions in the fretting process such as initiation of surface damage, development of severe surface damage, microcrack initiation and the development of mild wear, was investigated. For SAE 52100 against SAE 52100 steel, the minumum slip amplitude associated with the onset of mild oxidation or surface staining was approximately 0.06 micron. Studies at higher amplitudes of motion indicated a transition from minimal surface damage to severe or significant damage at 2.8 micron. A further slight increase in amplitude to approximately 3.0 micron resulted in a transition into a regime characterized by fatigue crack formation. These transformations were found to be influenced to some extent by material composition and hardness. The onset of severe surface damage occurred at 1.1 micron for SAE 52100 against SAE 1018 and at 0.5 micron for a nickel chrome Hastelloy B alloy against SAE 1018 steel. In general, the amplitude of microslip characterizing the transition from extremely mild to severe damage was found to increase with increasing material hardness. Keywords: Metal; Carbon steel. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1986
- Accession Number
- ADA169715
Entities
People
- Paul Kennedy
Organizations
- Naval Air Warfare Center Warminster