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首页> 外文期刊>Composite Structures >Failure analysis of adhesively-bonded metal-skin-to-composite-stiffener: Effect of temperature and cyclic loading
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Failure analysis of adhesively-bonded metal-skin-to-composite-stiffener: Effect of temperature and cyclic loading

机译：粘合金属蒙皮对复合加劲肋的失效分析：温度和循环载荷的影响

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摘要

The aim of this research is to analyse the failure of a Fiber Metal Laminate (FML) skin adhesively bonded to a Carbon Fiber Reinforced Polymer (CFRP) stiffener, under quasi-static loading at different environmental temperatures (-55 degrees C, Room Temperature RT and +100 degrees C) and under fatigue loading at RT. This bonded joint was tested using stiffener pull-off tests, which is a typical setup used to simulate full-scale components subject to out-of-plane loading. The failure sequence for all test conditions consist of: (1) damage initiation at the noodle of the CFRP stiffener; (2) damage propagation by delamination from the noodle to the stiffener foot; (3) detachment of the stiffener from the skin. Increasing the temperature, decreases the joint stiffness (40% when compared to RT) and decreasing the temperature decreases the maximum load (50% when compared to RT). The fatigue life initiation of the joint presents a very large scatter but the fatigue life propagation presents more stable results. The fatigue threshold (no damage) is reached at approximately 30% of the maximum load level. The fracture surfaces indicate a predominant inter and intra-laminar failure of the composite under mixed mode I/II. The CFRP stiffener is the weakest link of the bonded FML-skin-to-CFRP-stiffener both for static and fatigue loading. (C) 2017 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是分析在不同环境温度（-55摄氏度，室温RT）下的准静态载荷下，粘合到碳纤维增强聚合物（CFRP）加强筋上的金属纤维层压板（FML）蒙皮的失效和+100摄氏度）并在RT下承受疲劳载荷。使用加强筋拉力测试来测试此粘合接头，这是用于模拟承受平面外载荷的满量程组件的典型设置。所有测试条件下的破坏顺序包括：（1）CFRP加强筋面条处的破坏开始； （2）分层从面到加强筋脚的破坏传播； （3）加强筋从皮肤上脱落。提高温度，降低接头刚度（与RT相比为40％）和降低温度会降低最大载荷（与RT相比为50％）。接头的疲劳寿命开始表现出很大的分散性，但疲劳寿命的传播呈现出更稳定的结果。在最大负载水平的大约30％处达到疲劳阈值（无损坏）。断裂表面表明在混合模式I / II下复合材料的主要层间和层内破坏。对于静态和疲劳载荷，CFRP加强筋都是FML蒙皮与CFRP加强筋之间最薄弱的环节。 （C）2017 Elsevier Ltd.保留所有权利。

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