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首页> 外文期刊>Journal of the American Helicopter Society >Composite Skid Landing Gear Design Feasibility
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Composite Skid Landing Gear Design Feasibility

机译:复合防滑起落架设计的可行性

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摘要

Composite skid landing gear design feasibility results are presented. Limit drop test as per Federal Aviation Regulation (FAR) Part 27 has been simulated by finite element analysis using ABAQUS™ for multiple landing scenarios from a drop height of 508 mm (20 inches). Load factor, ply stresses, and ply strains are evaluation metrics. Study of seven fibers and two matrix systems has been used for laminate selection. 48 ply all-composite designs exhibit load factors within 4-6g with more than 40% weight saving in comparison to a 1/4-inch wall thickness aluminum design. High strains are observed in crossmember radii. Lower load factors with weight saving increased to 49% are observed in hybridized metal-composite configurations. Benefits of metal-composite hybridization are region dependent only. A 48-ply design with Ke49/PEEK skids, 1/4-inch-thick Al 7075 crossmember radii, and the rest of IM7/PEEK (or IM7/977-3) shows desired performance. Physics-based strength failure criteria are recommended over maximum strain theory.
机译:提出了复合滑架起落架设计的可行性结果。根据美国联邦航空法规(FAR)第27部分的跌落极限测试已使用ABAQUS™通过有限元分析对从508毫米(20英寸)跌落高度的多种着陆情况进行了模拟。载荷系数,层应力和层应变是评估指标。对七种纤维和两种基质系统的研究已用于层压板的选择。与1/4英寸壁厚的铝制设计相比,48层全复合设计的负载系数在4-6g之内,重量减轻了40%以上。在横梁半径中观察到高应变。在杂化的金属复合材料结构中,观察到了较低的负载系数,重量减轻了49%。金属复合物杂交的益处仅取决于区域。具有Ke49 / PEEK滑轨,1/4英寸厚的Al 7075横梁半径以及48毫米剩余的IM7 / PEEK(或IM7 / 977-3)的48层设计显示出理想的性能。在最大应变理论上,建议使用基于物理的强度破坏准则。

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