双向拉伸Hopkinson斜杆加载方法的探索与研究

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摘要为了实现对材料的双轴同步拉伸加载，现已有通过双向电磁脉冲驱动，以及对称双曲杆产生的双向拉伸波的方式，对试样进行双向动态拉伸加载。本文试图探索一种结构简单，造价低廉，加工难度小的双向拉伸Hopkinson斜杆加载装置。为了理解斜杆对弹性压缩波传播规律的影响，对斜杆撞击进行了ABAQUS有限元仿真计算和理想验证试验分析。结果发现，斜杆夹角在低于60°和高于90°时，方波平台段出现前高后低的情形，导致波形失真，同时在夹角大于105°之后，失真更为严重。本文还对多轴加载的同步性问题和双轴加载的数据获取进行了讨论和分析。结果表明，加载波的不同步会导致试样上加载阶跃，从而加载应变率阶跃，这会影响率敏感材料的试验准确性。为了验证该装置的有效性，搭建验证装置对双向拉伸杆上的拉伸波形进行试验验证，取得了较好的试验结果。

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	王思聪1
	南海鹏1
	赵思晗2

关键词 ： Hopkinson杆, 传播规律, 同步性, 双轴拉伸。

Abstract：In order to realize biaxial synchronous tensile loading of materials, biaxial dynamic tensile loading of the sample has been carried out by means of biaxial electromagnetic pulse drive and biaxial tensile wave generated by symmetric double curved bar. This paper attempts to explore a kind of biaxial stretching Hopkinson oblique bar loading device with simple structure, low cost and low processing difficulty. In order to understand the effect of oblique bar Angle on waveform, ABAQUS finite element simulation calculation and ideal verification experimental were carried out on the impact of inclined bar. The results show that the square wave platform segment is high in the front and low in the back when the angle between the oblique bar is outside 60° to 90°, which result in waveform distortion, and the waveform distortion is more serious when the angle is more than 105°. The synchronization of multiaxial loading and the data acquisition of biaxial loading are also discussed and analyzed in this paper. The results show that the step loading and strain rate step loading will be caused by the asynchrony phenomenon of loading wave, which will affect the test accuracy of rate-sensitive materials. In order to verify the effectiveness of the device, a verification device was built to verify the tension waveform on the biaxial tension bar, and good test results were obtained.

Key words： Hopkinson bar Propagation law Synchronism Biaxial tension.

收稿日期: 2022-06-08 出版日期: 2023-10-15

引用本文:

王思聪1，南海鹏1，赵思晗2. 双向拉伸Hopkinson斜杆加载方法的探索与研究[J]. 振动与冲击, 2023, 42(19): 117-124.
WANG Sicong1, NAN Haipeng1, ZHAO Sihan2. Exploration and study on biaxial tensile Hopkinson oblique bar loading method. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(19): 117-124.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I19/117

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