整体壁板结构纵向连接接头的优化设计

RESEARCH AND OPTIMIZATION DESIGN OF A RIVETED LONGITUDINAL LAP JOINT IN INTEGRAL PANEL STRUCTURE

纵向连接接头是影响机身整体壁板结构的安全疲劳寿命的关键部位,文中对三台阶搭接型、简单搭接型和两台阶搭接型三种机身整体壁板的纵向连接形式进行研究,应用Ansys软件建立这三种连接形式的铆钉接头结构件的参数化全局三维壳体有限元模型及局部细节子模型,进行静强度求解分析,确定接头结构件的铆钉孔边的应力集中系数,并对接头结构件的部分几何构形参数进行敏感性分析和优化设计,为纵向连接接头结构件的抗疲劳设计及综合验证提供科学依据。

Because the lap joint highly affects fatigue life of aircraft structure, three-stepped riveted lap joint, simple riveted lap joint and two-stepped riveted lap joint in integral panel structure were researched. Firstly, the global finite element models and finite element sub-models of the above riveted lap joints were built by ANASYS software. Based on the finite element analyses, the accurate stress contours of these riveted lap joint structures can be obtained, so the stress concentration coefficients of critical point can be calculated. The configuration dimensions of riveted lap joints were parameterized for optimization design and sensitivity analysis. The analysis results of three-stepped riveted lap joint, simple riveted lap joint and two-riveted lap joint have significant engineering application value for calculating fatigue performance of joint structure and provide scientific proof for design and validation of longitudinal lap joint.