Investigation of tension-compression fatigue behavior of a cross-ply metal matrix composite at room and elevated temperatures. Master's thesis
This research, the first load-controlled tension-compression fatigue testing to be performed on a MMC, extends the existing knowledge of MMC fatigue damage mechanisms to include the tension compression loading condition. To accomplish this, a (0/90)2, SCS-6/Ti-15-3 laminate was subjected to tension-tension fatigue at room temperature, and tension-compression fatigue at both room temperature and 427 deg C. Stress and strain data was taken to evaluate the macro-mechanic behavior of the material. Microscopy and fractography were performed to characterize the damage on a micro-mechanic level. On a maximum applied stress basis, the room temperature tension-tension specimens had longer fatigue lives than the room temperature tension-compression specimens. The room and high temperature tension-compression fatigue lives were nearly identical in the fiber-dominated high stress region of the SN curve. However, the increased ductility and diffused plasticity of the titanium matrix at 427 deg C delayed the onset and severity of matrix cracking, and thus increased the elevated temperature fatigue lives in the matrix dominated region of the SN curve. In all cases, matrix damage initiated at reaction zone cracks which nucleated both matrix plasticity and matrix cracking. Metal matrix composite, Elevated temperature, Fatigue testing, Compression, Fully-reversed, Titanium, Silicon carbide.
- Research Organization:
- Air Force Inst. of Tech., Wright-Patterson AFB, OH (United States). School of Engineering
- OSTI ID:
- 5438067
- Report Number(s):
- AD-A-273731/0/XAB; AFIT/GAE/ENY-93D-6
- Resource Relation:
- Other Information: Master's thesis
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fatigue behavior of a cross-ply metal matrix composite at elevated temperature under strain controlled mode. Master`s thesis
Investigation of fatigue behavior in notched cross-ply titanium metal matrix composite at elevated temperature. Master's thesis
Related Subjects
COMPOSITE MATERIALS
FATIGUE
STRESS ANALYSIS
TEMPERATURE DEPENDENCE
COMPRESSION
MATRIX MATERIALS
SILICON CARBIDES
STATIC LOADS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TENSILE PROPERTIES
TITANIUM BASE ALLOYS
ALLOYS
CARBIDES
CARBON COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
SILICON COMPOUNDS
TEMPERATURE RANGE
TITANIUM ALLOYS
360603* - Materials- Properties