This paper discusses the effect of loading rate on the static strength and fatigue behavior of glass/polyester and graphite/epoxy composites. It is shown that the rate-sensitivity of the static strength and the fatigue data can be analytically taken into account in the framework of a two-parameter “residual strength” model, inherently fulfilling the Strength-Life Equal-Rank Assumption (SLERA). Based on the static strength's loading rate sensitivity, a method to use the fatigue life data obtained at any fixed frequencies to predict the fatigue life under different frequencies is proposed. The method's reliability is verified by predicting different data sets of CA fatigue life and residual strength data obtained on glass/polyester composites under different loading rate conditions. The responses of angle-ply carbon/epoxy laminates to arbitrary two-block cyclic loadings in ascending and descending frequency sequences revealed the method's capability to discriminate between the applied loading sequences and the potential to develop a numerical routine accounting for the cycle-by-cycle variability during realistic loading conditions.

本文讨论了加载速率对玻璃/聚酯和石墨/环氧树脂复合材料的静态强度和疲劳行为的影响。结果表明，静态强度和疲劳数据的速率敏感性可以在两参数“剩余强度”模型的框架内进行分析考虑，本质上满足强度-寿命等秩假设（SLERA）。基于静强度对加载速率的敏感性，提出了一种利用任意固定频率下获得的疲劳寿命数据来预测不同频率下疲劳寿命的方法。通过预测不同加载速率条件下玻璃/聚酯复合材料的 CA 疲劳寿命和残余强度数据的不同数据集，验证了该方法的可靠性。