针对聚合物复合材料力学性能的加载频率依赖性问题，探讨、量化了复合材料静态和疲劳数据的应变率强化效应，提出了变频加载下复合材料剩余强度和疲劳损伤的评估方法。首先，分别对包含和不包含静强度的恒幅寿命数据执行幂律S-N曲线拟合，分析静强度和疲劳寿命的加载频率敏感性，进而通过引入应变率强化系数，量化了应变率对静强度的强化程度，确保了复合材料力学性能表征数据的应变率一致性。其次，利用强度储备概念构建了独立于应力峰值的概率型剩余强度模型，该模型能仅用一组模型参数预测任意应力峰值下的强度退化过程。最后，基于所开发模型和公开数据进行了变频加载的剩余强度预测，结果表明，升频加载和降频加载造成的累积损伤分别为0.323和0.493，与试验数据相差不超过5%，预测结果可靠。

To address the loading frequency dependence of the mechanical properties of polymer composites, the strain rate enhancement effect of the static and fatigue data of composites is explored, quantified, and a method for the assessment of residual strength and fatigue damage of composites under variable frequency loading is proposed. Firstly, power-law S-N curve fitting was performed on constant-amplitude life data containing and excluding static strength respectively to analyse the loading frequency sensitivity of static strength and fatigue life, and then the extent of strain rate reinforcement on static strength was quantified through the integration of strain rate reinforcement coefficients, which ensured the strain rate consistency of the data for the characterisation of the mechanical properties of the composites. Secondly, a probabilistic residual strength model independent of the peak stress is derived using the strength reserve concept, which is capable of predicting the strength degradation process at any peak stress using only one set of model parameters. Finally, the residual strength prediction of variable frequency loading was carried out based on the developed model and the published data, and the results showed that the cumulative damage caused by the ascending-frequency loading and descending-frequency loading were 0.323 and 0.493, respectively, which were no more than 5% different from the experimental data, and the prediction results were reliable.