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Influence of the Fatigue Load Level and the Hole Diameter on the Laminate Structurea??s Fatigue Performance

机译:疲劳载荷水平与孔径对层压结构疲劳性能的影响

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Damage tolerance of composite aircraft structure is one of the main areas of research, important when a new product is being developed. There are a number of variables, such as damage characteristics (dent depth, delamination area) and loading parameters (load type, amplitude of cyclic loading, load sequence) that need to be investigated experimentally [1]. These tests of composite materials are usually performed at an element level and are carried out in order to validate the analytical model, developed to predict the full-scale componenta??s behaviour. The paper presents the results of compression testing of the [36/55/9] carbon fibre/epoxy laminate, manufactured with the Automated Fibre Placement technology (AFP) and subjected to static and fatigue loads. The laminate compression loading mode was achieved through sandwich 4-point flexure. At the stage of fatigue testing, two parameters were investigated: the damage size, simulated by the hole diameter and the fatigue load level. Based on the test results, the laminate fatigue load limit equal to 75% of the OHC failure load was evaluated. By collating the static and fatigue tests results, the damage tolerance characteristic of the considered laminate was created.
机译:复合飞机结构的损坏容差是主要研究领域之一,当正在开发新产品时很重要。有许多变量,例如需要通过实验研究需要研究的损伤特性(凹陷深度,分层区域)和加载参数(负载型,循环加载,负载序列的幅度)[1]。这些复合材料的测试通常在元素水平下进行,并进行以验证分析模型,以预测满量程组成的行为。本文介绍了用自动化纤维放置技术(AFP)制造的[36/55/9]碳纤维/环氧树脂层压材料的压缩检测结果,并经受静态和疲劳载荷。通过夹层4点挠曲来实现层压压缩加载模式。在疲劳检测阶段,研究了两种参数:受孔直径和疲劳负载水平模拟的损伤尺寸。基于测试结果,评估了等于OHC破坏载荷的75%的层压疲劳负荷限制。通过整理静态和疲劳试验结果,创建了考虑层压板的损伤特性。

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