A mode II delamination growth rate model was constructed using constant amplitude fatigue data from mode II displacement-controlled testing, for the purpose of failure prediction. Unidirectional precracked composite coupons were tested using a fully reversible three-point bending fixture. Using a series of constant amplitude delamination growth rate data, the growth of delamination propagation under variable amplitude block loading was predicted and compared with experimental results. The model was then utilised to assist simplification of the variable amplitude FALSTAFF fatigue spectra by identifying non-damaging cycles to truncate. A 77% reduction in fatigue spectra length was achieved and confirmed through experimental fatigue testing.

为了预测故障，使用来自模式II位移控制测试的恒定振幅疲劳数据构建了模式II分层生长速率模型。使用完全可逆的三点弯曲夹具测试了单向预裂复合材料试样。使用一系列恒定振幅分层生长速率数据，预测了在可变振幅块载荷下分层传播的增长，并将其与实验结果进行了比较。然后，通过识别无损循环以进行截断，该模型可用于简化幅度可变的FALSTAFF疲劳谱。疲劳谱长度减少了77％，并通过实验疲劳测试得到证实。