Based on the study of strain distribution in short fiber/whisker reinforced metal matrix composites, a deformation characteristic parameter λ is defined as the ratio of the root mean square strain of reinforcers to the macro linear strain along the same direction. Quantitative relation between λ and microstructure parameters of the composite is obtained. As an example of applying and verifying λ , the stress strain curve of [AlBO]w/Al composite under tensile loading is predicted and favorably compared with experiments. By using λ , the stiffness modulus of the composite with arbitrary reinforcer orientation under any loading condition is predicted from the microstructure parameters of material.
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