Numerical and experimental investigation of manufacturing and performance of metal inserts embedded in CFRP
Numerical and experimental investigation of manufacturing and performance of metal inserts embedded in CFRP
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CFRP 中金属嵌件的制造和性能的数值和实验研究
DOI：
10.1007/s11740-018-0829-9
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Henning
中科院分区：
文献类型：
--
作者：
Schwennen;Bernath;Seuffert;Weidenmann;Fleischer;Henning
碳纤维增强塑料(CFRP)因其优异的特殊力学性能，在轻量化结构中显示出很大的应用潜力。对于多材料设计，为了避免钻取结构CFRP部件以将其连接到其他部件，可以使用嵌入的金属元素，即所谓的嵌件。插入件由轴和嵌入在纤维层之间的底板组成。到目前为止，只有点状插入物受到了研究。一种可行的几何形状是尚未研究过的线性刀片。在这项工作中，将研究两种不同类型的直线刀片的性能。这些形状是基于点状镶件，它是由焊接在底板上的螺纹轴制成的，其在不同类型载荷下的性能之前已经被研究过。第一种类型的线性插入件具有与基准点状插入件相同的横截面，但为线性形式。第二种类型是准线性镶件，它由与第一种线性镶件尺寸相同的底板和焊接在其上的三个螺纹轴组成。所有样品都是通过树脂传递模塑(RTM)制造的。根据插件的几何形状和预成形概念，有可能保持纤维的连续性。对于具有连续轴且位于刀片附近的刀片，必须切割垂直于轴对齐的顶层的纤维。对于准线性镶件，当纤维围绕圆轴引导时，可以保持纤维的连续性。除了进行力学测试外，还对不同的镶件进行了充模和固化模拟，以分析工艺参数对零件质量的影响。在主要的一系列试验中，对试件的破坏行为和准静态载荷下的承载能力进行了表征。试验结果表明，与点状基准嵌件相比，线性传力元件具有更高的承载能力。然而，线性载荷引入元件在比承载能力方面较差，并且在预成形和生产过程中增加了工艺复杂性。
Due to their outstanding specific mechanical properties, carbon fibre reinforced plastics (CFRP) exhibit a high application potential for lightweight structures. With respect to multi-material design and to avoid drilling of structural CFRP parts to join them to other components, embedded metal elements, so called inserts, can be used. The inserts consist of a shaft and a baseplate which is embedded between the fibre layers. So far, only punctiform inserts have been subject to research. One feasible geometry are linear inserts which have not been studied yet. In this work, the performance of two different types of linear inserts will be investigated. The shapes are based on a punctiform insert which is made out of a threaded shaft welded onto a baseplate whose performance under different types of loading has been investigated before. The first type of linear inserts has the same cross-section as the reference punctiform insert but is of a linear form. The second type is a quasi-linear insert which consists of a baseplate with the same dimensions as the first linear inserts and three threaded shafts welded onto it. All samples are manufactured by resin transfer moulding (RTM). Depending on the geometry of the insert and the preforming concept it is potentially possible to maintain the fibre continuity. For the inserts with a continuous shaft and in the proximity of the insert, it is necessary to cut fibres of the top layers which are aligned perpendicular to the shaft. For the quasi-linear insert, it is possible to maintain the fibre continuity as the fibres are guided around the circular shafts. Additional to mechanical tests that are carried out, mould-filling and curing simulations are performed for different inserts to analyse the influence of the process parameters onto the part quality. In the main series of tests, the specimens are characterized regarding their failure behaviour and load bearing capacity under quasi-static loads. The results of the experiments show that, compared to the punctiform reference insert, the linear load introduction elements exhibit higher load bearing capacity. However, the linear load introduction elements are inferior regarding specific load bearing capacity and furthermore increase process complexity during preforming and production.
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DOI：
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发表时间：
2017
期刊：
影响因子：
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