Investigation of compressive behavior for metal matrix composites with a circular hole. Master's thesis

Technical Report · Wed Dec 01 00:00:00 EST 1993

OSTI ID:5357566

Gooder, J L

This study investigated the notched and unnotched macromechanical response due to micromechanical behavior of O/+/-45/90 (sub s) SCS-6/beta 21 S and 0/90/2 (sub S) Sigma/Beta 21S subjected to static compressive loads at room temperature. The stress-strain behavior and mechanical response in the presence of a circular hole was examined. A clear description of the progressive nature of damage, which ultimately resulted in failure, was provided. The effect of elevated temperature was shown for SCS-6/Beta 21S. The ultimate compressive strength and elastic modulus were reported for both MMCs. Sigma/Beta 21S and SCS-6/Beta 21S were mildly notch sensitive at room temperature. Notch sensitivity of SCS-6/Beta 21S was slightly reduced at 650 deg C. Internal failure mechanisms of fiber debonding, matrix cracking, matrix yielding, fiber failure, and fiber microbuckling were observed in various combinations during the loading. Damage mechanisms were observed similarly in notched and unnotched specimens. Damage initiation in the notched specimens was concentrated in the region adjacent to the hole. Sigma/Beta 21S and unnotched SCS-6/Beta 21S at room temperature failed in an extensional mode, while notched SCS-6/Beta 21S and unnotched SCS-6/Beta 21S at 650 deg C failed in a shear mode. The ultimate compressive failure of each depended on the ultimate strength of the fibers. Metal Matrix Composite, Elevated Temperature, Compression, Titanium, Silicon Carbide, Sigma, Notch.

• Research Organization: Air Force Inst. of Tech., Wright-Patterson AFB, OH (United States)
• OSTI ID: 5357566
• Report Number(s): AD-A-273835/9/XAB; AFIT/GAE/ENY-93D-15
• Resource Relation: Other Information: Master's thesis
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
COMPRESSION
FRACTURE PROPERTIES
TEMPERATURE DEPENDENCE
CHARPY TEST
COMPRESSION STRENGTH
ELASTICITY
FATIGUE
MATRIX MATERIALS
SILICON CARBIDES
STATIC LOADS
STRESS ANALYSIS
TITANIUM BASE ALLOYS
ULTIMATE STRENGTH
ALLOYS
CARBIDES
CARBON COMPOUNDS
DESTRUCTIVE TESTING
IMPACT TESTS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
SILICON COMPOUNDS
TENSILE PROPERTIES
TESTING
TITANIUM ALLOYS
360603* - Materials- Properties