基于局部屈曲、压损载荷的帽型长桁截面优化设计

Optim izing the Hat-Stringer Cross Section Based on Local-Buckling and Crippling

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。

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.