Lightweight design by using low-density and load-adapted materials can reduce the weight of vehicles and the emissions generated during operation. However, the usage of different materials requires innovative joining technologies with increased versatility. In this investigation, the focus is on describing and characterising the failure behaviour of connections manufactured by an innovative thermomechanical joining process with adaptable auxiliary joining elements in single-lap tensile-shear tests. In order to analyse the failure development in detail, the specimens are investigated using in-situ computed tomography (in-situ CT). Here, the tensile-shear test is interrupted at points of interest and CT scans are conducted under load. In addition, the interrupted in-situ testing procedure is validated by comparing the loading behaviour with conventional continuous tensile-shear tests. The results of the in-situ investigations of joints with varying material combinations clearly describe the cause of failure, allowing conclusions towards an improved joint design.

中文翻译：

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具有辅助连接元件的热机械制造接头失效机制的原位计算机断层扫描分析

使用低密度和负载适应材料的轻量化设计可以减轻车辆的重量和运行过程中产生的排放。然而，不同材料的使用需要具有更高多功能性的创新连接技术。在这项研究中，重点是描述和表征在单搭接拉伸剪切测试中通过创新的热机械连接工艺和适应性辅助连接元件制造的连接的失效行为。为了详细分析失效发展情况，使用原位计算机断层扫描（原位 CT）对样本进行研究。此处，拉伸剪切测试在感兴趣的点处中断，并在负载下进行 CT 扫描。此外，通过将加载行为与传统的连续拉伸剪切测试进行比较，对间断原位测试程序进行了验证。对不同材料组合的接头进行现场调查的结果清楚地描述了失效原因，从而得出改进接头设计的结论。