Troschitz Juliane, Gröger Benjamin, Würfel Veit, Kupfer Robert, Gude Maik
Institute of Lightweight Engineering and Polymer Technology, Technische Universität Dresden, Holbeinstraße 3, 01307 Dresden, Germany.
Materials (Basel). 2022 Aug 8;15(15):5454. doi: 10.3390/ma15155454.
Thermoplastic composites (TPCs) are predestined for use in lightweight structures, especially for high-volume applications. In many cases, joining is a key factor for the successful application of TPCs in multi-material systems. Many joining processes for this material group are based on warm forming the joining zone. This results in a change of the local material structure characterised by modified fibre paths, as well as varying fibre contents, which significantly influences the load-bearing behaviour. During the forming process, many different phenomena occur simultaneously at different scales. In this paper, the deformation modes and flow mechanisms of TPCs during forming described in the literature are first analysed. Based on this, three different joining processes are investigated: embedding of inserts, moulding of contour joints, and hotclinching. In order to identify the phenomena occurring in each process and to describe the characteristic resulting material structure in the joining zones, micrographs as well as computed tomography (CT) analyses are performed for both individual process stages and final joining zones.
热塑性复合材料（TPCs）注定要用于轻量化结构，特别是在大批量应用中。在许多情况下，连接是TPCs在多材料系统中成功应用的关键因素。该材料组的许多连接工艺都基于对连接区域进行热成型。这会导致局部材料结构发生变化，其特征是纤维路径改变以及纤维含量不同，这会显著影响承载行为。在成型过程中，许多不同的现象会在不同尺度上同时发生。本文首先分析了文献中描述的TPCs在成型过程中的变形模式和流动机制。在此基础上，研究了三种不同的连接工艺：嵌件嵌入、轮廓接头成型和热压铆接。为了识别每个工艺中出现的现象并描述连接区域中形成的特征材料结构，对各个工艺阶段和最终连接区域都进行了显微照片以及计算机断层扫描（CT）分析。
