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Experimental and numerical investigation of pulse-shaped split Hopkinson pressure bar test

机译：脉冲形霍普金森压力棒试验的实验和数值研究

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摘要

Employing a proper pulse shaper in the conventional split Hopkinson pressure bar (SHPB) test helps to achieve dynamic equilibrium condition and to fulfill a constant strain rate condition in the test specimen. To this end, the parameters affecting the incident pulse shape, i.e., pulse shaper thickness, pulse shaper diameter, striker bar length and striker bar velocity are experimentally studied. Moreover, simulation results, validated by experimental data together with wave propagation analysis, are exploited to provide general guidelines to properly design a pulse shaper. It is recommended to use a relatively large diameter pulse shaper for testing work-hardening materials. Also, for different test conditions, e.g.. striker bar velocity, it is recommended to scale the pulse shaper thickness and cross-sectional area proportional to the striker bar velocity. Employing these guidelines considerably reduce the try and error process for selecting proper pulse shaper. Finally, to show the effectiveness of the proposed guidelines in practice, SHPB experiments on copper and cast iron specimens are performed. The results show that the variation of strain rate in the specimens is reduced significantly when a proper pulse shaper is employed.
机译：在传统的霍普金森分体式压力棒（SHPB）测试中使用合适的脉冲整形器有助于实现动态平衡条件并满足试样中恒定的应变率条件。为此，实验研究了影响入射脉冲形状的参数，即，脉冲整形器的厚度，脉冲整形器的直径，撞针长度和撞针速度。此外，利用实验数据和波传播分析对仿真结果进行了验证，从而为正确设计脉冲整形器提供了一般指导。建议使用直径较大的脉冲整形器来测试加工硬化材料。另外，对于不同的测试条件，例如撞杆速度，建议按比例调整脉冲整形器的厚度和截面积。采用这些准则可大大减少选择合适的脉冲整形器的尝试和错误过程。最后，为了展示所提出的指导原则在实践中的有效性，对铜和铸铁样品进行了SHPB实验。结果表明，采用适当的脉冲整形器后，样品中应变率的变化显着降低。

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