Accession Number:

ADA289394

Title:

Investigation of Tension-Compression Fatigue Behavior of a Unidirectional Metal Matrix Composite at Elevated Temperature.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

• Kraabel, Darren L.

Report Date:

1994-12-01

Pagination or Media Count:

101.0

Abstract:

This study investigated the fatigue behavior in a unidirectional metal matrix composite under tension-compression loading conditions. Stress-strain responses, modulus and strain trends were monitored to characterize damage. Fractography and microscopy were used to characterize failure modes. Fatigue life curves were plotted base on different parameters such as stress and strain. Tension-compression fatigue life was shorter than the obtained under tension-tension fatigue cycling. Creep, observed in tension-tension. fatigue cycling, and the effects of the compressive load on the plastic zone around the crack tip explain shorter life under tension-compression fatigue loading.

Descriptors:

• *AIRCRAFT
• *METAL MATRIX COMPOSITES
• *FATIGUE(MECHANICS)
• COMPRESSION
• STRESS STRAIN RELATIONS
• FATIGUE LIFE
• HIGH TEMPERATURE
• TENSILE STRESS
• STIFFNESS
• CRACKING(FRACTURING)
• FIBER REINFORCED COMPOSITES
• THESES
• STRENGTH(MECHANICS)
• MICROSCOPY
• FRACTOGRAPHY
• BUCKLING
• CREEP
• FAILURE(MECHANICS)
• CYCLIC LOADS
• UNIDIRECTIONAL

Subject Categories:

• Aircraft
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE