There are a variety of approaches that can be employed for Hopkinson bar compression testing and there is no standard procedure. A Split-Hopkinson pressure bar (SHPB) testing technique is presented which has been specifically developed for the characterisation of hazardous materials such as radioactive metals. This new SHPB technique is validated and a comparison is made with results obtained at another laboratory. Compression SHPB tests are performed on identical copper specimens using the new SHPB procedures at Imperial College London and confirmatory measurements are performed using the well-established configuration at the University of Oxford. The experiments are performed at a temperature of 20 ∘C and 200 ∘C. Imperial heat the specimens externally before being inserted into the test position (ex-situ heating) and Oxford heat the specimens whilst in contact with the pressure bars (in-situ heating). For the ex-situ case, specimen temperature homogeneity is investigated both experimentally and by simulation. Stress-strain curves were generally consistent at both laboratories but sometimes discrepancies fell outside of the inherent measurement uncertainty range of the equipment, with differences mainly attributed to friction, loading pulse shapes and pulse alignment techniques. Small metallic specimens are found to be thermally homogenous even during contact with the pressure bars. A newly developed Hopkinson bar for hazardous materials is shown to be effective for characterising metals under both ambient and elevated temperature conditions.

中文翻译：

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用于危险材料的霍普金森杆的开发和验证

有多种方法可用于霍普金森杆压缩测试，并且没有标准程序。介绍了一种 Split-Hopkinson 压力棒 (SHPB) 测试技术，该技术专为表征放射性金属等危险材料而开发。这种新的 SHPB 技术得到了验证，并与在另一个实验室获得的结果进行了比较。在伦敦帝国理工学院使用新的 SHPB 程序对相同的铜试样进行压缩 SHPB 测试，并使用牛津大学完善的配置进行验证性测量。实验在 20 ∘ C 和 200 ∘ C 的温度下进行。在将试样插入测试位置之前，先从外部对试样进行帝国加热（非原位加热），牛津大学在与压力棒接触的同时加热试样（原位加热）。对于非原位情况，通过实验和模拟来研究样品温度均匀性。两个实验室的应力-应变曲线通常是一致的，但有时差异超出了设备固有的测量不确定度范围，差异主要归因于摩擦、加载脉冲形状和脉冲对准技术。发现即使在与压力棒接触期间，小的金属样品也是热均匀的。新开发的用于危险材料的霍普金森棒已被证明可有效表征环境和高温条件下的金属。