The paper proposes a novel type of stiffener designed to bear bending loads by exploiting internal pressure effects. The stiffener is made of two adjacent thin-walled pipes (r/t≥50) jointed with a connecting strip. Such a structure is shown to have higher performance against buckling failure compared to a single pipe and its geometry allows for good exploitation of internal pressurisation.\ud\udThe study is conducted by using the FEA software ANSYS and the analysis technique is the linear perturbation buckling analysis. Internal pressure ranges from 0 to 1.4 MPa. The buckling mechanisms are observed for a set of models with different values of length, wall thickness and geometric variation of the cross-section. It is shown that two different buckling modes can take place. However, for a given geometry, the level of pressure can alter the behaviour and lead to one mode rather than the other one.\ud\udPotential of the presented structure is maximised by the use of high performance materials and a possible aerospace engineering application is presented.
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机译：本文提出了一种新型的加劲肋，旨在通过利用内部压力效应来承受弯曲载荷。加强筋由两个相邻的薄壁管（r /t≥50）制成，并与连接板连接。与单根管道相比，这种结构具有更高的抗屈曲性能，其几何形状可以很好地利用内部压力。\ ud \ ud使用FEA软件ANSYS进行了这项研究，分析技术是线性摄动屈曲分析。内部压力为0到1.4 MPa。对于具有不同长度，壁厚和横截面几何变化值的一组模型，可以观察到屈曲机制。结果表明，可以发生两种不同的屈曲模式。但是，对于给定的几何形状，压力水平可能会改变行为并导致一种模式，而不是另一种模式。\ ud \ ud通过使用高性能材料可以最大程度地发挥结构的潜力，并且可能在航空航天工程中得到应用提出了。
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