Measurement system for split Hopkinson pressure bar apparatus based on laser interferometry technique

ZHANG Zhen; WANG Yonggang

doi:10.11883/bzycj-2017-0116

Volume 38 Issue 5

Jul. 2018

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ZHANG Zhen, WANG Yonggang. Measurement system for split Hopkinson pressure bar apparatus based on laser interferometry technique[J]. Explosion And Shock Waves, 2018, 38(5): 1165-1171. doi: 10.11883/bzycj-2017-0116

Citation:

ZHANG Zhen, WANG Yonggang. Measurement system for split Hopkinson pressure bar apparatus based on laser interferometry technique[J]. Explosion And Shock Waves, 2018, 38(5): 1165-1171. doi: 10.11883/bzycj-2017-0116

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Measurement system for split Hopkinson pressure bar apparatus based on laser interferometry technique

doi: 10.11883/bzycj-2017-0116

ZHANG Zhen,
WANG Yonggang^,

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

Received Date: 2017-04-11
Rev Recd Date: 2017-05-17
Publish Date: 2018-09-25

Abstract

Abstract

Conventional measurements in SHPB are based on recording the strain profiles on the incident and transmitted bars with strain gauges, and require good adhesion between the strain gauge and bars, which strongly depends on the skill of an operator. In this paper, the all fiber laser interferometry technique with two fiber focusers based on the principle of Doppler frequency shift is used to establish a non-contact optical measurement system for SHPB. The monitoring objective of the new measurement system is the particle velocity that can be easily converted into strain and stress by means of stress wave propagation. For the ductile and brittle materials, two measurement methods by using of laser normal irradiation and laser obliqueirradiation were proposed, respectively. Taking aluminum alloy and PZT ceramics as examples, the validity of the two optical measurement systems was verified by comparing with the traditional SHPB measurement results and the DIC measurement results. The laser interferometry technique has several advantages over traditional strain gauge measurements. It is non-calibrating, high repeatable and high reliability, which is helpful to realize the standardization of SHPB measurement system.
- split Hopkinson pressure bar,
- laser interferometry,
- particle velocity,
- aluminum alloy,
- PZT ceramics

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References(20)

References

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