Effects of the fillers on the interface strength of the hat-stiffened composite panel

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Longquan Liu, Zhongwei Guan
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Abstract

Hat-stiffened composite skins have been widely used in primary structures of aircraft components. The bonding strength at the stiffener-skin interface is critical to ensure the advanced load-bearing capacity of the stiffened skin, whereas, the deltoid regions are usually the weakest locations because of the geometrical singularity. Inserting fillers into the deltoid regions could alter the bonding strength. In this study, a series of four-point bending tests are conducted on the co-cured hat-stiffened composite skin specimens with and without fillers and with different pre-fabricated debonding defects, furthermore, finite element simulations are implemented to predict the failure process. The stiffness, initial failure load, failure mode and failure process are analyzed to obtain the influences of the fillers on the damage tolerance of the hat-stiffened composite panels, and the influential mechanisms were revealed by the combined analyses of the test and simulation results. It is found that the usage of fillers can increase the initial stiffness of the panel without prefabricated defects by about 10%, but provide limited influence on the initial failure load. The pre-fabricated debonding defect along longitudinal direction has little influence on the stiffness and failure load, but the influence of the defect along transverse direction are higher. The initial failure of all hat-stiffened composite panels with/without filler and with/without prefabricated defects under four-point bending onsets around the deltoid region. The usage of the fillers changed the load transfer and the stress status in the deltoid region of the hat-stiffened composite panels and as a consequence, the initial failure modes were changed and the failure load were increased by the fillers. This work provides a technical support for the damage tolerance design and strengthening method of hat-stiffened composite structures.
填料对帽加筋复合板界面强度的影响
帽子加筋复合材料蒙皮已广泛应用于飞机部件的初级结构中。加强筋-蒙皮界面的结合强度是保证蒙皮高级承载能力的关键,而三角区域由于几何奇异性通常是最薄弱的位置。在三角区插入填料会改变粘接强度。在本研究中,对共固化帽加筋复合材料皮试件进行了含填料、不含填料和不同预制脱粘缺陷的四点弯曲试验,并进行了有限元模拟来预测其破坏过程。通过刚度、初始破坏载荷、破坏模式和破坏过程的分析,获得了填料对帽加筋复合材料板损伤容限的影响,并通过试验与仿真结果的结合分析揭示了影响机理。研究发现,填料的使用可使无预制缺陷面板的初始刚度提高约10%,但对初始破坏载荷的影响有限。纵向预制脱粘缺陷对刚度和破坏载荷影响较小,而横向预制脱粘缺陷对刚度和破坏载荷影响较大。所有带/不带填料和带/不带预制缺陷的帽加筋复合板在三角区周围四点弯曲的初始破坏。填料的使用改变了帽加板三角区的荷载传递和应力状态,改变了帽加板的初始破坏模式,增加了破坏载荷。为帽加筋复合材料结构的损伤容限设计和加固方法提供了技术支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Polymers & Polymer Composites
Polymers & Polymer Composites 工程技术-材料科学:表征与测试
CiteScore
4.30
自引率
9.50%
发文量
90
审稿时长
5.7 months
期刊介绍: Polymers & Polymer Composites provides a forum for the publication of expertly peer reviewed, international research into the following topics: - Fibre reinforced and particulate filled plastics - Engineering plastics - Nanocomposites - Polymers or polyblends intended for engineering use (including structural, load bearing electronic and electrical applications) - Fibre reinforced and particulate filled plastics - Structural adhesives - Textile & wood fibres - Biomaterials with a load bearing capacity, (including polymer based dental materials)
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