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首页> 外文期刊>Journal of Manufacturing Processes >Characterization of weld attributes in ultrasonic welding of short carbon fiber reinforced thermoplastic composites
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Characterization of weld attributes in ultrasonic welding of short carbon fiber reinforced thermoplastic composites

机译：短碳纤维增强热塑性复合材料超声焊接中焊接属性的表征

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Ultrasonic welding is a well-known technique for joining thermoplastics and has recently been introduced for joining carbon fiber reinforced thermoplastic composites. However, there is a lack of understanding on how weld quality attributes develop under different welding conditions, especially without using an energy director. In this paper, ultrasonic welding of an injection molded short carbon fiber reinforced composite is tested to investigate three important weld attributes, bonding efficiency, weld area, and horn indentation. From a two-level full factorial experiment, welding energy is found having the most important influence on joint quality, which is related to weld attributes. Thus, only welding energy is varied to simplify the analysis of weld attributes evolution during the welding process. After examining the microstructure of the cross sections and the fracture surface of the welded joints, several observations were obtained. First, the bonding formation for the carbon fiber reinforced composite is mainly through the polymer-polymer interface healing with involved carbon fibers as reinforcements. Second, the bonding efficiency and weld area increase with an increase in welding energy until they reach a threshold. As welding energy continues to increase, the bonding efficiency will decrease due to material degradation as pores develop, but weld area will remain unchanged. Finally, the difference of welding attributes leads to three failure modes of the joints, e.g. interfacial separation, nugget shear fracture, and nugget pull-out fracture, which are an indicator of the joint quality. These experimental observations provide insights toward the development of a robust ultrasonic welding process for fiber reinforced composites. (C) 2017 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
机译：超声波焊接是用于接合热塑性塑料的公知技术，并且最近已被引入用于接合碳纤维增强的热塑性复合材料。然而，对于在不同焊接条件下如何发展焊接质量属性缺乏了解，尤其是在没有使用能量导向器的情况下。在本文中，对注射成型的短碳纤维增强复合材料的超声波焊接进行了测试，以研究三个重要的焊接属性，即焊接效率，焊接面积和焊头压痕。通过两级全因子实验，发现焊接能量对接头质量具有最重要的影响，这与焊接属性有关。因此，仅改变焊接能量以简化焊接过程中焊接属性演变的分析。在检查了焊接接头的横截面和断裂表面的微观结构之后，获得了一些观察结果。首先，碳纤维增强复合材料的粘结形成主要是通过聚合物-聚合物界面的愈合，其中涉及的碳纤维作为增强材料。其次，粘结效率和焊接面积随着焊接能量的增加而增加，直到达到阈值。随着焊接能量的不断增加，由于孔的形成，材料的降解会降低焊接效率，但焊接面积将保持不变。最后，焊接属性的差异导致接头的三种失效模式，例如：界面分离，金块剪切断裂和金块拔出断裂，是关节质量的指标。这些实验观察为纤维增强复合材料的稳健超声焊接工艺的发展提供了见识。 （C）2017年制造工程师学会。由Elsevier Ltd.出版。保留所有权利。

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