金属加筋壁板蒙皮有效宽度分析方法

Analysis method of effective skin width of metallic stiffened panels

民用飞机机身、机翼的壁板、气密框以及翼梁结构为典型的壁板加筋结构,在承受压缩载荷时需考虑成由蒙皮与筋条组成的复合剖面共同承载,其通常为中长柱,工程分析时常取30倍的蒙皮厚度作为蒙皮有效宽度。取30倍的蒙皮厚度作为蒙皮有效宽度存在着一定的保守性,介绍了Von Karman迭代分析方法、有限元分析方法及常用的工程分析方法。在加筋壁板结构的轴压承载能力计算中,蒙皮有效宽度的确定是较为关键的设计因素,对飞机机身、机翼结构效率的提高和重量控制至关重要。随着加工能力的提升,虽然部分壁板结构由组合式逐渐过渡到了整体机加形式,但所述方法仍有一定的借鉴意义,对目前国内外常用的金属加筋壁板有效宽度的工程分析方法进行了研究,并结合有限元分析对工程分析方法进行了验证。

The fuselage and wing structure of civil aircraft are typical stiffened panel structure. When bearing compressive load, the combined cross section of skin and stiffener should be considered, which usually are medium long columns. In engineering analysis, 30 times of skin thickness is often taken as the skin effective width, which is conservative. This paper introduces Von Karman analysis method, finite element analysis method and common engineering analysis method. In the calculation of axial compression capacity of stiffened panel structures, the effective skin width is a key design factor, which is very important to the improve the efficiency and weight control of aircraft fuselage and wing. With the improvement of the processing capacity, although parts of the stiffened panel structures are gradually transferred from the combination type to the integral machine process type, the method described in the paper still has some reference significance. This paper studies the commonly used engineering analysis methods at home and abroad and verifies the engineering analysis methods with finite element analysis.