Joint failure plays a key role in determining structural stability and crash or impact response. Characterizing the joints at high loading rates is challenging as oscillations are often overlaid on the measured data, making interpretation of the results more difficult. This paper builds upon the experimental testing three different mixed-material joints using a split-Hopkinson tension bar. The correction proposed in this work is verified using a finite element model of the entire testing system. The modeling efforts also investigate the differences in a specimen only model and a model including the entire testing system. The failure mechanisms of bolted and bonded joints are investigated, where the substrate stress state is found to play a large role in determining the failure mode for bolted joints. This work lays the foundations needed to investigate the mixed-material bolted and bonded joints in detail.

中文翻译：

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高速载荷下多材料混合关节的建模

接头失效在确定结构稳定性和碰撞或冲击响应方面起着关键作用。在高负载率下表征关节具有挑战性，因为振荡经常叠加在测量数据上，使得结果的解释更加困难。本文基于使用分裂式霍普金森拉杆对三种不同的混合材料接头进行的实验测试。在这项工作中提出的修正使用整个测试系统的有限元模型进行验证。建模工作还调查了仅样本模型和包括整个测试系统的模型之间的差异。研究了螺栓连接和粘接接头的失效机制，发现基材应力状态在确定螺栓连接的失效模式中起着重要作用。