铆接加劲钣复合型断裂应力分析的解析方法

 一、引言 铆接桁条加劲钣是飞机结构中的典型构件,对其断裂特性的研究,已做了大量的工作。但都仅限于纯Ⅰ型问题。由于飞机结构通常承受复合型载荷,所以研究加劲钣的复合型断裂特性更为重要。在应力分析的方法中,解析法相对数值方法有计算简单、精确、数据工作量小、计算机时少等优点。为此,我们导出了含斜裂纹的铆接桁条加劲钣,在单轴拉伸作用下的应力场及应力强度因子等参数的解析计算公式,为该类结构的强度分析提供了一种精确、简单的计算方法。

AN ANALYTICAL METHOD FOR STRESS ANALYSIS ON MIXED MODE FRACTUPE OF A RIVETED STIFFENED PANEL

The model considered in this paper is an inclined crack in an infinite riveted panel reinforced with stringers and subjected to uniaxial tension. From the compatibility relations among plate, rivets and stringers, compatibility equations for solving rivet forces in two directions are established. After the rivet forces have been found, analytical formulas for exact solutions of linear elastic stress field, stress intensity factors and load concentration coefficient in stringers are derived by making use of superposition principle. A simple and precise computational method has thus been provided for this type of structures.Unlike other methods, we have in this analysis taken the transverse forces in rivets into account. The results of computed examples show that the effects of transverse rivet forces can not be ignored in mixed I...II mode fracture analysis of riveted stiffened panels.