Bending Fatigue of a Particulate SiC/Al 6061 Metal Matrix Composite.
Final rept. Oct 82-Sep 83,
NAVAL ACADEMY ANNAPOLIS MD DIV OF ENGINEERING AND WEAPONS
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The bending fatigue behaviour of 20 volume percent SiC particulate reinforced Al 6061-T6 sheet was investigated. Improved mechanical properties and ductility in the material, as compared to past results and Al 6061-T6 sheet, provided higher fatigue resistance. Low cycle fatigue specimens failed immediately after crack initiation. High cycle fatigue specimens exhibited a coarse step morphology, but classic striations were not observed. The existence of crack propagation at lower stresses was not verified. Preliminary results suggest that the fatigue resistance of particulate SiC reinforcedAl6061 composite exhibits orientation dependence. Also particulate SiC reinforcedAl6061 composite has less fatigue resistance than whisker reinforced material. Improvement in surface finish also needs to be made over presently available material.
- Laminates and Composite Materials
- Metallurgy and Metallography