分割-霍普金森压力杆测试部分侧面封闭的水.
K S O Li1, A Van Lerberghe1, A D Barr1
1Department of Civil & Structural Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD UK.
概括
这项研究实验性地研究了水的高应变率行为,使用修改后的Split-Hopkinson压力杆. 结果显示没有粒子凝聚力,揭示了流体动力学当前数值模拟的局限性.
科学领域:
- 流体动力学 流体动力学
- 材料科学 材料科学 材料科学
- 实验物理实验物理学
背景情况:
- 研究水的高应变率行为对于理解极端条件下的流体动力学至关重要.
- 之前的研究缺乏对水在高应变率下的行为进行实验验证.
- 这项研究开创了对水的高应变率性质的实验调查和数值验证.
研究的目的:
- 通过实验来确定水在高应变率下的三轴行为.
- 用数值模拟来验证实验结果,特别是光滑粒子水力学 (SPH).
- 为了评估修改后的分裂-霍普金森压力杆 (SHPB) 装置用于流体表征的有效性.
主要方法:
- 使用修改后的分裂-霍普金森压力杆 (SHPB) 与部分侧边封闭装置.
- 使用周围的水库进行横向封闭,并使用压力传感器进行应力测量.
- 应用了分散校正算法 (SHPB_Processing.py) 进行精确的应力和应变计算.
主要成果:
- 经过修改的装置成功评估了水在高延展率下的三轴行为.
- 实验结果表明,水粒子之间缺乏凝聚力.
- 数字建模 (LS-DYNA与SPH) 显示了捕捉这种行为的局限性,突出了模型改进的需要.
结论:
- 修改后的装置能够在高应变率下描述流体的行为.
- 缺少水中的凝聚力是影响流体建模的关键发现.
- 未来的研究可以结合实验测试和精细的数值建模来进行先进的流体表征.
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