低阻抗试样动态加载试验相关问题研究

殷建平; 张晨旭; 孙若恒; 陈希曦; 苗应刚

doi:10.21656/1000-0887.450279

低阻抗试样动态加载试验相关问题研究

doi: 10.21656/1000-0887.450279

殷建平^1,2,3,
张晨旭^1,3,4,
孙若恒^1,3,4,
陈希曦²,
苗应刚^1,3,4, ,

1. 陕西省冲击动力学及工程应用重点实验室，西安 710072;
2. 西北工业大学民航学院，西安 710072;
3. 强度与结构完整性全国重点实验室，西安 710072;4. 西北工业大学航空学院，西安 710072

基金项目:

国家自然科学基金（12472392）；陕西省国际科技合作基金重点项目（2023-GHZD-12）；中国航空科学基金（2023-GHZD-12）

详细信息

作者简介:
殷建平（1996—），男，博士生(E-mail: jpyin@mail.nwpu.edu.cn);苗应刚（1983—），男，副教授，博士，硕士生导师(通讯作者. E-mail: ygmiao@nwpu.edu.cn).

通讯作者:
苗应刚（1983—），男，副教授，博士，硕士生导师(通讯作者. E-mail: ygmiao@nwpu.edu.cn).

中图分类号: O348
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- 文章访问数: 40
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- 被引次数: 0
出版历程
- 收稿日期: 2024-10-21
- 修回日期: 2025-04-10
- 网络出版日期: 2025-05-30

Study of Dynamic Loading Tests on Low-Impedance Specimens

YIN Jianping^1,2,3,
ZHANG Chenxu^1,3,4,
SUN Ruoheng^1,3,4,
CHEN Xixi²,
MIAO Yinggang^{1,3,4
, ,}

1. Shaanxi Key Laboratory of Impact Dynamics and Engineering Application, Xi’an 710072, P.R.China;
2. School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, P.R.China;
3. National Key Laboratory of Strength and Structural Integrity, Xi’an 710072, P.R.China;4. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, P.R.China

Funds:

The National Science Foundation of China(12472392)

摘要

摘要: 研究了Hopkinson杆开展低阻抗试样高应变率加载测试的关键问题：低阻抗透射信号有效采集和应力平衡问题.综合前期研究基础，选用异质低阻抗透射杆并辅以原位标定半导体应变片技术，实现低阻抗试样高精度测试；结合应力波加载试样的过程重构计算和分析，获得了低阻抗试样的应力平衡历程和影响因素敏感性特征，并提出了类梯形入射波，可使低阻抗试样尽早实现应力平衡和恒定应变率加载.研究结果表明：低阻抗有机玻璃杆/管作为透射杆并辅以半导体应变片可实现载荷低至数Newton的透射信号采集；低阻抗试样应力平衡历程依赖于其弹性波速，在类梯形入射波加载下，2倍特征时间上升沿时可实现应力平衡以及其后的恒定应变率加载；其可基于试样厚度设计实现不同应变率加载下的临界有效应变一致性.
- Hopkinson杆 /
- 低阻抗试样 /
- 动态加载 /
- 应力平衡 /
- 透射信号 /
- 高应变率
Abstract: The key problems of the effective acquisition of low-impedance transmitted signals and the stress equilibrium in the Hopkinson bar loading tests on low-impedance specimens with high strain rates, were investigated. Based on the previous research fundaments, low-impedance elastic transmitted bars were introduced to replace the traditional metal transmitted bar, the in-situ calibrated semiconductor strain gauge technology was used to amplify weak transmitted signals, and the low-impedance specimens were tested with high precision. Reconstruction and calculation of the stress wave loading process were conducted to get the stress equilibrium history and the influential factors’ sensitivity. The trapezoidal incident wave was proposed to realize stress equilibrium and achieve constant strain rate loading on specimens as early as possible. The results show that, low impedance polymethyl methacrylate bars/tubes as transmitted bars along with semiconductor strain gauges can acquire weak signals as low as several Newtons. The stress equilibrium history of the low-impedance specimen depends on the elastic wave velocity. Under the trapezoidal incident wave loading, the stress equilibrium and constant strain rate loading can be achieved at 2 characteristic periods. Based on the design of specimen thicknesses, the critical effective strain consistency can be achieved under different stress rate loadings.
- Hopkinson bar /
- low-impedance specimen /
- dynamic loading /
- stress equilibrium /
- transmitted signal /
- high strain rate

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