An improved Asay foil method for measuring areal density of ejecta under complex loading conditions

WANG Weirong; CHEN Shuyang; WANG Xuejun; ZHAO Xinwen; HUANG Shizhang; LI Xinzhu; WU Qiang

doi:10.11883/bzycj-2023-0089

Volume 44 Issue 3

Mar. 2024

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Article Navigation > Explosion And Shock Waves > 2024 > 44(3): 034101

WANG Weirong, CHEN Shuyang, WANG Xuejun, ZHAO Xinwen, HUANG Shizhang, LI Xinzhu, WU Qiang. An improved Asay foil method for measuring areal density of ejecta under complex loading conditions[J]. Explosion And Shock Waves, 2024, 44(3): 034101. doi: 10.11883/bzycj-2023-0089

Citation:

WANG Weirong, CHEN Shuyang, WANG Xuejun, ZHAO Xinwen, HUANG Shizhang, LI Xinzhu, WU Qiang. An improved Asay foil method for measuring areal density of ejecta under complex loading conditions[J]. Explosion And Shock Waves, 2024, 44(3): 034101. doi: 10.11883/bzycj-2023-0089

Citation:

WANG Weirong, CHEN Shuyang, WANG Xuejun, ZHAO Xinwen, HUANG Shizhang, LI Xinzhu, WU Qiang. An improved Asay foil method for measuring areal density of ejecta under complex loading conditions[J]. Explosion And Shock Waves, 2024, 44(3): 034101. doi: 10.11883/bzycj-2023-0089

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An improved Asay foil method for measuring areal density of ejecta under complex loading conditions

doi: 10.11883/bzycj-2023-0089

National Key Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics,China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2023-03-12
Rev Recd Date: 2024-01-19

Available Online: 2023-12-18

Publish Date: 2024-03-14

Abstract

Abstract

The Asay foil has been a widely applied diagnostic in ejecta measurement since its design was first reported in 1976. An Asay foil is a foil of a known mass (or areal density), whose velocity changed when it is impacted by ejecta. The Foil velocity is measured using velocimetry and the ejecta velocity is inferred from the initial gap between foil and free surface and the ejecta fly time. The mass of the impacting ejecta can then be inferred from the change in momentum of the foil. In some cases, the ejecta spray out from complex loading conditions such as double shock loading condition, the initial gap and fly time are unable to measure accurately, thus the Asay foil method doesn’t work. Therefore, it is necessary to develop an Asay foil method that does not depend on the initial gap and fly time. An improved Asay foil method is then developed based on the traditional Asay foil method. This method uses photonic Doppler velocimetry (PDV) to obtain the ejecta velocity in the testing area of the Asay foil probe, and the Asay foil probe obtains the foil velocity curve after the ejecta collides with the foil. Based on spatial position constraints and precise temporal correlation, the combination of the two velocity curve results can provide the total amount and distribution of ejecta under complex loading conditions. A numerical experimental method was used to generate ejecta particle groups with different distribution states, as well as the PDV velocity curve and Asay foil velocity curve to analyze the applicability of the method. In addition, the numerical experimental analysis results were verified using light gas gun experiments. The numerical experimental analysis results show that this method has good applicability in three typical ejecta distribution cases, with a deviation of less than 20% between the measured value and the theoretical value. The results of the light gas gun tests indicate that the deviation between the improved method and the traditional Asay foil method is less than 20%.
- ejecta,
- Asay foil,
- photonic Doppler velocimetry,
- areal density

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References(15)

References

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