民用飞机机身蒙皮修理的广布疲劳损伤试验研究与有限元分析

为了研究民用飞机机身蒙皮修理的广布疲劳损伤特性,设计试验件进行试验研究,并对其进行有限元分析。结果表明:机身蒙皮修理连接区的初始裂纹的萌生位置基本上是等概率随机产生的;在多裂纹的共同作用下,导致结构剩余强度降低,引起裂纹萌生的加速和竞争效应,最终导致连接区破坏;损伤容限分析得到的主裂纹扩展曲线与试验结果趋势吻合,但计算结果较小、趋于保守。

Experimental Study and Finite Element Analysis of WFD for Civil Aircraft Fuselage Skin Repair

Experimental study and finite element analysis has been performed on designed specimen to research the widespread fatigue damage characteristics of fuselage skin repair for civil aircraft. Test and analysis results showed that the initial location of crack at connecting region was basically equal probability of randomly generated. Residual strength of structure decreased originating from the combined effect of multiple-site crack. It caused the acceleration and competition effects of crack initiation. Connecting region failure finally occurred since the propagation and coalescence of main crack which acquired the competition advantage. The main crack propagation curves of damage tolerance analysis and experiments had the same trend, but the calculation of the crack propagation life was less than the test results.