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
      Inorganic Chemistry
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE