Accession Number:

ADA334785

Title:

Materials Degradation and Fatigue Under Extreme Conditions

Descriptive Note:

Final rept. 1 Apr 1994-31 Aug 1997

Corporate Author:

ILLINOIS UNIV CHAMPAIGN

Personal Author(s):

• Jonas, Jiri

Report Date:

1997-10-29

Pagination or Media Count:

93.0

Abstract:

This AFOSR URI addressed complex research problems of materials degradation and fatigue in aerospace structures in severe or extreme environments. A better understanding of materials degradation and flaw initiation dynamics was achieved through a multi-disciplinary research program encompassing chemistry, surface physics, materials science and mechanics, both experimental and theoretical. The Subprojects were as follows 1 Surface Induced Degradation of Fluorocarbon Lubricants 2 Molecular Tribology of Perfluoroether Lubricants 3 Fluids, Including Lubricants Under Extreme Conditions of High PressureHigh Temperature and Confinement 4 Surface Crack Propagation Under Combined Mechanical and High Pressure Fluid Loading and 5 Lubricant Assisted Fatigue Crack Growth in Ceramics.

Descriptors:

• *FATIGUE(MECHANICS)
• *LUBRICANTS
• *TRIBOLOGY
• AEROSPACE CRAFT
• CERAMIC MATERIALS
• CRACK PROPAGATION
• DEFECTS(MATERIALS)
• DEGRADATION
• FLUORINATED HYDROCARBONS
• RAMAN SPECTRA
• SLIDING FRICTION
• SURFACE CHEMISTRY

Subject Categories:

• Lubricants and Hydraulic Fluids
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE