基于有限元的加筋板结构后屈曲分析方法研究

摘要

The load-carrying capacity calculation of skin-stringer stiffened structure is an important part of aircraft designing, and accurate simulation of stiffness modification is the key point of post-buckling computation technology. Investigation of structure idealization, element, material property and solution procedure selection based on FEM has been undertaken, and validated with a series stiffened panels and stiffened box. The numerical analysis results in failure mode and capability agree well with the test, and the error is less than 10%, prove the effectiveness of the present analysis methodologies. The work could provide some useful advices for the post-buckling computational analysis of stiffened structures.%　　加筋板结构的承载能力计算是飞机设计中的重要内容，采用后屈曲分析技术的关键在于准确模拟结构刚度变化。基于有限元从结构简化、单元选取、材料属性和求解流程选取方面对加筋壁板后屈曲建模分析方法进行了介绍，并基于一系列加筋壁板和加筋盒段对方法进行了验证。验证结果表明计算的破坏形式和破坏载荷与物理试验结果符合的很好，破坏载荷误差在10%以内，证明了方法的准确性和工程实用性。文中的工作可为加筋壁板结构后屈曲分析提供一些有益的建议。