For detailed stress distribution analysis of bondlines, non-linear finite element analysis (FEA) is necessary. Depending on the load case in relation to shear and tension/compression adhesives show a different behaviour of the yield point [1], which is e.g. included in the Mahnken and Schlimmer [2] model. State of the art for biaxial tested adhesive material-characteristics is the use of bonded tubular butt joints under variable torsion and tension loads. Important for the quality of the determined material values is the alignment of both tubes. The quality is significantly improved, if both tubes are aligned perfectly coaxial. Also, the bondline has to be free of voids. In previous work [3], Wölper investigated the effects of coaxial and angle deviations for the results of material characteristics using FEA. A slight deviation has a strong negative impact to the results. Particularly for thin film-adhesives with elevated curing temperatures, the change of viscosity of the adhesive and the thermal expansion of the tubes must be considered. Previous investigations regarding the manufacturing of the specimens showed shortfalls in joining and curing them. Due to voids, geometric deviations or poorly-bonded tubes, no reliable results were achieved yet. Therefore, a new assembly-device is developed and tested. The results show well joined tubes without a significant angle deviation and with an average of 40 µm in coaxial deviation. The thickness of the bondline can be adjusted and is constant over the whole diameter. The new joining-device enables the testing of tubular butt joints to determine biaxial material values of thin higher-temperature-cured film-adhesives. The device is patented to DE 102017114538.9.

中文翻译：

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一种用于制造具有更高膜胶固化温度的管状对接接头的新型接合装置

为了对接合线进行详细的应力分布分析，必须进行非线性有限元分析（FEA）。根据与剪切和拉伸/压缩相关的载荷情况，粘合剂会显示出屈服点[1]的不同行为，例如，包括在Mahnken和Schlimmer [2]模型中。双轴测试粘合材料特性的最新技术是在可变的扭转和拉伸载荷下使用粘结的管状对接接头。对于确定的材料值而言，重要的是两个管的对准。如果两个管都完全同轴对齐，则质量将得到显着改善。同样，粘合线必须没有空隙。在以前的工作中[3]，Wölper使用FEA研究了同轴度和角度偏差对材料特性结果的影响。轻微的偏差会严重影响结果。特别是对于固化温度升高的薄膜胶粘剂，必须考虑胶粘剂的粘度变化和管子的热膨胀。先前有关标本制造的调查表明，在连接和固化标本方面存在不足。由于空隙，几何偏差或管子粘结不良，尚未获得可靠的结果。因此，开发并测试了新的组装设备。结果表明，连接良好的管没有明显的角度偏差，同轴偏差平均为40 µm。粘合线的厚度可以调节，并且在整个直径上恒定。新的连接装置可以测试管状对接接头，以确定高温固化薄膜胶粘剂的双轴材料值。该设备已获得DE 102017114538.9的专利。