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Buckling performance of curvilinearly grid-stiffened tow-placed composite panels considering manufacturing constraints

机译：考虑到制造限制的曲线栅格加强牵引复合板的屈曲性能

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摘要

Tow-placement machines are able to fabricate variable-stiffness composite panels with curvilinear stiffeners. In this paper the buckling performance of curvilinearly grid-stiffened composite panels subjected to in-plane compressive loads under various boundary conditions is addressed. A Python-Abaqus script is developed to perform the buckling analysis of the panels. The skin is modelled using shell elements and the grid stiffeners are idealized by beam elements. Different design tailoring scenarios for grid-stiffened and unstiffened constant-stiffness and variable-stiffness skins are presented to demonstrate the influence of the stiffness variation created simultaneously by both the layout of the curvilinear stiffeners and by the fiber orientation variation of the skin on the buckling capacity. It is shown that the buckling resistance of the grid-stiffened quasi-isotropic skins can significantly be improved using curvilinear stiffeners compared to their straight design counterparts. A much higher degree of improvement can be achieved by concurrently tailoring both the skin and the stiffeners using curvilinear fibers. In order to guarantee the manufacturability of the designs, manufacturing constraints in terms of maximum curvature along the fiber and stiffener paths are imposed. It is demonstrated that imposing these constraints has negative effects on the buckling load improvement obtained for designs without considering manufacturing constraints.
机译：牵引机能够用曲线加强筋制造可变刚度复合板。在本文中，解决了在各种边界条件下进行面内压缩载荷的曲线曲线加强复合板的屈曲性能。开发了一个Python-Abaqus脚本以执行面板的屈曲分析。皮肤使用壳元件进行建模，并且栅格加强件通过梁元件理想化。提出了用于栅格加强和不稳定的恒定刚度和可变刚度皮肤的不同设计剪裁场景，以证明通过曲线加强筋的布局以及皮肤上皮肤上的纤维取向变化同时产生的刚度变化的影响容量。结果表明，与直的设计对应物相比，使用曲线加强筋可以显着改善网格加强的准各向同性皮肤的屈曲电阻。通过使用曲线纤维同时剪裁皮肤和加强剂，可以实现更高程度的改进。为了保证设计的可制造性，施加了沿着纤维和加强路径的最大曲率的制造限制。据证明，施加这些约束对设计的屈曲负荷改善而不考虑制造限制，施加这些约束具有负面影响。

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