民用飞机蒙皮加筋壁板损伤容限分析方法探讨

主要介绍了民用飞机蒙皮加筋壁板损伤容限的分析方法,以中间筋条断裂的两跨纵向裂纹为例,将影响结构损伤容限特性的因素分为三部分进行计算,分别是加筋效应、鼓胀效应以及应力分布效应,最终得到相对应的裂纹尖端的应力强度因子并且进行裂纹扩展分析及剩余强度计算。文中选取实例采用这种方法进行计算,并将计算结果与试验数据对比,两者吻合较好,说明了本方法的可行性及实用性。

Analysis of Damage Tolerance for Civil Aircraft Stiffened Skin Panel

This article introduces a method of damage tolerance analysis of stiffened skin panel for civil aircraft,shown by an example of panel with two-bay longitudinal crack and center broken frame, taking into account three parts of factors: stiffening effect, bulging effect and the stress distribution. Stress intensity factor at each crack tip is derived from combination of above mentioned three factors. At last, the analysis of the crack growth in skin and the residual strength for the surrounding intact structures can be performed. One chosen example is calculated by this method, and the analysis results are compared to the relative test results, which show that the agreement between them is very good. The practicability and the feasibility of this method are proved.