直撞式霍普金森压杆二次加载技术

钟东海; 郭鑫; 熊雪梅; 郑宇轩; 宋力

doi:10.11883/bzycj-2022-0210

直撞式霍普金森压杆二次加载技术

doi: 10.11883/bzycj-2022-0210

宁波大学冲击与安全工程教育部重点实验室，浙江宁波 315211

基金项目: 国家自然科学基金面上项目（12272193，12072169，11972203）

详细信息

作者简介:
钟东海（1997－　），男，硕士研究生，zhongdonghai1997@foxmail.com

通讯作者:
郑宇轩（1986－　），男，博士，副教授，zhengyuxuan@nbu.edu.cn

中图分类号: O347.4
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- 被引次数: 0
出版历程
- 收稿日期: 2022-05-16
- 修回日期: 2022-10-24
- 网络出版日期: 2022-10-26
- 刊出日期: 2023-04-05

Direct-impact double-loading Hopkinson bar technique

Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China

摘要

摘要: 利用传统分离式霍普金森压杆（split Hopkinson pressure bar, SHPB）实验技术来实现试件在较低应变率下的大变形时，需要使用超长的压杆系统，杆件的加工和实验空间限制了该技术的推广应用。鉴于此，提出一种直撞式霍普金森压杆二次加载实验技术，利用透射杆中的应力波在其末端的准刚性壁反射实现对试件的二次加载，并分析了准刚性质量块尺寸对二次加载的影响规律；采用二点波分离方法对叠加的应力波进行了有效分离和计算，在总长4 m的压杆系统中实现了1.2 ms的长历时加载，并可以准确获得试件的加载应变率曲线和应力应变关系。建立了直撞式霍普金森压杆二次加载有限元模型，数值仿真结果表明，该实验技术能有效地实现试件的二次加载，与超长SHPB系统获得的仿真结果相比较，两者的试件应力应变关系完全一致。利用该技术对1100铝合金材料进行动态压缩实验，实现了其在10² s⁻¹量级应变率下的大变形动态力学性能测试。
- SHPB /
- 二次加载 /
- 波反演技术 /
- 中应变率加载 /
- 大变形
Abstract: When the conventional split Hopkinson pressure bar (SHPB) experimental method is used to realize large deformation of the specimen at a low strain rate, it is often necessary to employ an ultra-long compression bar system. However, the high cost of machining long bars and occupying large laboratory space limits the application and generalization of this technique. In this paper, a direct impact Hopkinson pressure bar double loading experimental technique is proposed. The stress wave in the transmission bar is reflected by the quasi-rigid wall at the end of the transmission bar to realize the double loading of the specimen. The influence of the size of the quasi-rigid mass on the double loading is further analyzed. The two-point wave separation method is used to separate and calculate the superimposed stress wave effectively, and the long duration loading of 1.2 ms is realized in the pressure bar system with a total length of 4 m, and the strain rate curve and stress-strain relationship of the specimen are obtained accurately. The finite element model of both direct-impact double loading and ultra-long Hopkinson bars are established. Numerical results indicate that this experimental technique can effectively achieve double loading of the specimen. Comparing the simulation results of direct-impact double loading Hopkinson bar with those of ultra-long Hopkinson bars, it is evident that the stress-strain relationships obtained by the two experimental devices are completely consistent. For direct-impact double loading Hopkinson bar, the stress-strain relationship calculated by the two-point wave separation technique is the same as that obtained by direct extraction method. Then, an experimental device of direct impact double-loading Hopkinson pressure bar has been set up, including a strike bar, a transmission bar and a rigid block. In addition, the dynamic compression experiment of aluminum alloy was carried out using this device, and the large deformation dynamic mechanical properties of aluminum alloy were tested under the strain rate of 10² s⁻¹.
- SHPB /
- double-loading /
- wave inversion /
- intermediate strain rate loading /
- large deformation

HTML全文

图 1 DDHB系统

Figure 1. DDHB system

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图 2 应力波传播的X-t图和σ-v图

Figure 2. Stress wave propagation X-t diagram and stress-velocity σ-v diagram

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图 3 不同条件下的应变率时程曲线

Figure 3. Strain rate time history curves under different conditions

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图 4 波分离示意图

Figure 4. Schematic diagram of stress wave separation

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图 5 质量块的反射系数

Figure 5. Reflection coefficient of rigid mass block

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图 6 不同撞击杆长度对加载的影响

Figure 6. Influence of different strike bar length on loading process

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图 7 DDHB和SHPB仿真结果

Figure 7. DDHB and SHPB simulation results

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图 8 数据处理结果与直接处理结果

Figure 8. Data processing and direct extraction results

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图 9 实验装置图

Figure 9. Diagram of experimental device

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图 10 速度为5.81 m/s时的原始波形、分离的左右行波以及试件端面的速度和力

Figure 10. The original waveform, the separated left and right traveling waves, and the velocity and force at the end face of the specimen with a velocity of 5.81 m/s

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图 11 DDHB测试铝合金的实验结果

Figure 11. Experimental results of testing aluminum alloy by DDHB

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