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概述了短纤维复合材料临界长径比数学模型的研究进展，基于短纤维橡胶基复合材料的结构－应力传递特点和Ｃｏｘ剪滞法推导了其临界长径比数学模式，并由此进行了讨论。结果表明，推导的模型能够较好地适合短纤维橡胶复合材料的特性，与以往的模型相比，它能全面地反映结构因素对复合材料中短纤维临界长径比的影响。
The research progress of the mathematical model of the critical aspect ratio of short fiber composites is summarized. Based on the structure-stress transfer characteristics of the short fiber rubber matrix composites and the Cox shear lag method, the mathematical model of the critical aspect ratio is derived and discussed . The results show that the derived model is well suited to the properties of short fiber rubber composites. Compared with the previous models, the model can fully reflect the influence of structural factors on the critical aspect ratio of short fibers in the composites.