采用断裂力学方法获得了纤维增强复合材料强度与脱粘长度、纤维临界长度以及纤维体积分数的定量关系.该公式较好地预测了纤维的临界长度以及强度与纤维体积分数的关系.并再现了复合材料混合定则.该公式也较好地解释了丝状复合材料强度随短期循环变形载荷与周次增加而增加的现象其原因是在循环变形中.纤维与基体界面结合强度发生变化.导致纤维临界长度与脱粘长度发生变化.从而使复合材料强度增加,但这种增加是有限的和有范围的.循环变形的发展最终导致强度下降.
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