model of short fibre-reinforced composites is put forward from the viewpoint of bionic design. Considering Poisson's contraction effect of fibre, stress distributions in plain and enlarged-end fibre reinforced composites are analyzed. It is found that the effect of radial stress at the interface on the stress distributions is small when the interfacial bond is perfect, but when the bonding is imperfect, the radial stress controls the sliding behavior of interface between fibre and matrix. The stress distributions at sliding and non-sliding zones are different. And the effects of elastic constants and geometric parameters are discussed. When the interfacial bonding is imperfect, the strength of composites with enlarged-end fibers is greater than that of the composites with plain fibers of the same properties and aspect ratio. The theoretical model is verified by experiments.
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