Accession Number : ADA306258
Title : Stress/Strain Ratio Effects on Fatigue Response of a SCS-6/Ti-15-3 Metal Matrix Composite at Elevated Temperature.
Descriptive Note : Master's thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
Personal Author(s) : Jackson, Sean C.
PDF Url : ADA306258
Report Date : DEC 1995
Pagination or Media Count : 126
Abstract : This study investigated the fatigue life and damage mechanisms of a 08, SCS-6/Ti-15-3, metal matrix composite at 427 deg C for three different stress/strain ratios, R = -1, 0 and 0.5. Fatigue life and damage mechanism comparisons were made for the varying R ratios and between the load and strain control modes. Fatigue life comparisons show that on a maximum stress/strain basis as R is increased fatigue life increases while on a stress/strain range basis as R increases fatigue life decreases. Similar damage mechanisms were found between the R = -1 and R = 0 tests conducted at the same maximum stress/strain level. However, comparisons between R = 0 or R = -1 and R = 0.5 show that the decreased stress/strain range at R = 0.5 results in increased fatigue life and the onset of matrix damage at the same maximum stress/strain level.
Descriptors : *STRESS STRAIN RELATIONS, *RATIOS, *HIGH TEMPERATURE, *METAL MATRIX COMPOSITES, *RESPONSE, *FATIGUE, DAMAGE, FATIGUE LIFE, STRAIN(MECHANICS), TITANIUM ALLOYS.
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE