THE ROLE OF THE INTERFACE REGION ON THE MECHANICAL BEHAVIOR OF METAL-MATRIX COMPOSITES.
DREXEL UNIV PHILADELPHIA PA DEPT OF METALLURGICAL ENGINEERING
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The ambient temperature uniaxial compressive behavior of aluminum-stainless steel composites was examined for volume fractions in the range 0.041 to 0.328. Experimental values of the initial elastic modulus are in accord with rule of mixtures behavior. However, the observed precision elastic limit and microyield stress strain 0.0000025 exceed rule of mixtures calculations by a factor approximately 2 at the macroyield stress strain 0.001 the discrepancy is by a factor in the range 5 to 8. From an analysis of the variation of composite yield stress with volume fraction reinforcement, it is concluded that the load is carried primarily by the ends of the stainless steel wires this compressive test constitutes a restrained buckling test of the fibers in a ductile matrix. A comparison is made of the observed compressive stresses at failure with theoretical predictions based on different models for the failure mode. It is found that the model developed by Dow, et al., modified to take account of work hardening in the aluminum phase, provides excellent agreement with the experimental data. Author
- Laminates and Composite Materials