Hopkinson杆式冲击疲劳实验方法研究

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Abstract In both civilian and military fields, equipment or structural components are often subjected to repeated impacts with high loading rates, namely impact fatigue problems. The impact fatigue test device is the basis for studying the impact fatigue problems, therefore an impact fatigue test method based on the split Hopkinson bar is presented in this article, where the impact projectile is reset by vacuum system, the incident bar is limited by elastic restraint during the loading process, and the transmission bar and the specimen are reset by an electric push bar. The above process is controlled by the PLC controller. The continuous real-time display of waves through signal acquisition on the bar can be realized by this method which is easy to operate and can change the geometric configuration of the impact projectile to produce loading wave with different wave configurations (trapezoidal wave, triangle wave and half sine wave) and different loading rates (8×105~3×106MPa/s). Meanwhile, the loading frequency ranges from 0 to 0.5Hz. Finally, the applicability of the method is demonstrated in this paper with test results for high-strength steel cylindrical specimens and three-point-bending specimen processed by additive manufactured 316L stainless steel with process defects.

Key words： impact fatigue repeated loading Hopkinson bar three-point-bending specimen

Received: 01 September 2021 Published: 28 January 2023

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	Articles by authors
	LI Boli
	ZHAO Sihan
	LIU Yuanmeng
	YANG Jianhui
	GUO Weiguo

Cite this article:

LI Boli,ZHAO Sihan,LIU Yuanmeng, et al. Method for experiment study on impact fatigue based on Hopkinson bar[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(2): 132-138.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I2/132

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