Fatigue Resistance Criteria for Fiber-Reinforced Composite Structures.
Final rept. 1 Apr 71-30 Sep 74,
DUKE UNIV DURHAM N C DEPT OF CIVIL ENGINEERING
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The research effort was concentrated on metal matrix composites, such as the Al-B, Al-Be, Cu-W, and similar systems. It was found that in as-fabricated composites with soft matrices fatigue failure can be prevented if the composite shakes down during cyclic loading. The fatigue strength of heat-treated composites is affected by residual microstresses, but failure can be prevented if the total microstresses are kept within the respective fatigue limits at 10 to the 7th power cycles of the constituents. These criteria for prevention of fatigue failure in metal matrix composite systems were verified by extensive comparisons of theoretical predictions with available experimental results.
- Laminates and Composite Materials