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多裂纹损伤严重影响飞机连接结构的损伤容限能力,针对多裂纹损伤结构引入了多部位相互影响因子(MSIF)和多元件相互影响因子(MEIF)的概念,以此来反映裂纹之间的相互影响,并给出了获得这两个影响因子的有限元计算过程。对典型的含多裂纹结构进行了模拟计算,获得了了不同开裂状态下各裂纹尖端处的多部位相互影响因子和多元件相互影响因子的数值拟合结果,在此基础上,进一步计算并对比分析了含多裂纹结构的裂纹扩展寿命和剩余强度,结果表明:多部位相互影响和多元件相互影响对裂纹扩展寿命和剩余强度有显著的影响,在结构损伤容限评定中对多裂纹损伤应当予以重视。
The multi-crack damage seriously affects the damage tolerance of the aircraft connection structure. The multi-crack interaction structure (MSIF) and multi-component interaction factor (MEIF) are introduced to the multi-crack damage structure to reflect the interaction between the cracks Influence, and gives the finite element calculation process of obtaining these two influence factors. A typical multi-cracked structure was simulated and the numerical results of multi-component interaction factors and multi-component interaction factors at each crack tip under different crack conditions were obtained. On this basis, further calculation and comparison The crack propagation life and residual strength of multi-cracked structures were analyzed. The results show that the interaction between multi-component and multi-component have a significant effect on the crack propagation life and residual strength. Multi-crack damage should be evaluated in structural damage tolerance assessment Pay attention.