EFFECTS OF COMPOSITE INTERFACES ON MECHANICAL PROPERTIES.
Final rept. 16 May 66-31 Dec 67,
ASTRO RESEARCH CORP CARPINTERIA CA
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Interfaces in metal matrix composites reinforced with high modulus filaments were studied in order to obtain an increased understanding of the effects of interface type on the mechanical properties of various composite systems. A search of the published literature and subsequent investigations in stress field characterization and fracture mechanics led to the adoption of a modified Mohr-Coulomb hypothesis for the prediction of interface failure. To verify the hypothesis, an experimental program was conducted utilizing a traction-torsion test composite of special design which incorporated an interface between vacuum deposited aluminum and chemical vapor deposited boron. Other experimental work was performed on vacuum deposited aluminum and titanium matrix composites reinforced with boron and silicon carbide filaments with the object of characterizing interface bonds developed under various conditions of thermal treatment. Several methods were employed, including conventional optical metallographic techniques, electron microscope inspection, X-ray diffraction camera studies, electron beam microprobe analysis, and mechanical testing. In addition, a differential scanning calorimeter technique was evaluated to determine the suitability of this method to the detection of interface reactions. Author
- Laminates and Composite Materials