作为辅助问题，首先考虑了单根纤维嵌在无限大基体的特殊情形，导出了纤维和基体中随时间变化的应力场。其次，应用平均场方法给出了任意时刻复合材料的总体响应。

As an auxiliary problem, the special case of a single fiber embedded into an infinite matrix is considered firstly, and the time dependent stress in the composite at any time is given.

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