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已完成了LY12CZ及LC4CS材料4种厚度(5mm、4mm、3mm、2mm)共66件试件的疲劳裂纹扩展试验。用Weibull分布给出了在给定置信度水平下的P-da/dN-△K曲线及不同可靠度下Paris公式的拟合值参量。并对同一可靠度下相同材料、不同厚度的裂纹扩展统计特性作了比较,其结果可供飞机结构耐久性、损伤容限及可靠性设计时参考使用。
The fatigue crack growth test of 66 specimens of 4 thicknesses (5mm, 4mm, 3mm, 2mm) of LY12CZ and LC4CS has been completed. The P-da / dN- △ K curves at given confidence level and the fitted values of Paris formula under different reliability are given by Weibull distribution. The crack propagation statistics of the same material and thickness with the same reliability are compared. The results can be used as a reference for the design of aircraft structure durability, damage tolerance and reliability.