Study of Dynamic Loading Tests on Low-Impedance Specimens

YIN Jianping; ZHANG Chenxu; SUN Ruoheng; CHEN Xixi; MIAO Yinggang

doi:10.21656/1000-0887.450279

Volume 46 Issue 5

May 2025

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Article Navigation > Applied Mathematics and Mechanics > 2025 > 46(5): 650-660

YIN Jianping, ZHANG Chenxu, SUN Ruoheng, CHEN Xixi, MIAO Yinggang. Study of Dynamic Loading Tests on Low-Impedance Specimens[J]. Applied Mathematics and Mechanics, 2025, 46(5): 650-660. doi: 10.21656/1000-0887.450279

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Study of Dynamic Loading Tests on Low-Impedance Specimens

doi: 10.21656/1000-0887.450279

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)

Received Date: 2024-10-21
Rev Recd Date: 2025-04-10

Available Online: 2025-05-30

Abstract

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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References(47)

References

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