基于局部屈曲、压损载荷的帽型长桁截面优化设计

由于帽型长桁的截面尺寸较大,其两边突缘与蒙皮相连形成一个闭合截面,具有很高的受压稳定性,因此被广泛应用于复合材料机身壁板。在局部屈曲和压损载荷下,用MATLAB线性优化帽型长桁截面尺寸,并得出帽型长桁局部屈曲载荷与帽底宽度,帽腰和帽底夹角的关系曲线;压损载荷与帽底宽度,帽腰和帽底夹角的关系曲线,为设计师在初步尺寸设计时提供参考。

Optimizing the Hat Stringer Cross Section Based on Local Buckling and Crippling

The hat stringer has large cross section and the cross section is closed by flanges and skin ,which leads to high stability when it compressed. For this reason the hat stringer is widely used in composite panel. This paper optimizes the hat stringer section in the condition of local buckling and crippling by MATLAB, and obtaines the buckling strength as function of hat stringer width and the angle between hat stringer width and the waist, and the crippling strength as function of hat stringer width and the angle between hat stringer width and the waist. These functions can provide references to designers in the preliminary design.