Mr. Juho Lee Profile

Juho Lee

Integrated M.S. & PhD Candidate

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Proceedings Article | 15 April 2016 Paper

Nondestructive evaluation of pyroshock propagation using hydrocodes

Juho Lee, Dae-Hyeon Hwang, Jae-Kyeong Jang, Jung-Ryul Lee, Jae-Hung Han

Proceedings Volume 9799, 97993Q (2016) https://doi.org/10.1117/12.2219022

KEYWORDS: Nondestructive evaluation, Wave propagation, Explosives, Laser Doppler velocimetry, Signal processing, Numerical analysis, Velocity measurements, Systems modeling, Aerospace engineering, Analytical research, Finite element methods, Statistical analysis

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Pyroshock or pyrotechnic shock generated by explosive events of pyrotechnic devices can induce fatal failures in electronic payloads. Therefore, understanding and estimation of pyroshock propagation through complex structures are necessary. However, an experimental approach using real pyrotechnic devices is quite burdensome because pyrotechnic devices can damage test structures and newly manufactured test structures are necessary for each experiment. Besides, pyrotechnic experiments are quite expensive, time-consuming, and dangerous. Consequently, nondestructive evaluation (NDE) of pyroshock propagation without using real pyrotechnic devices is necessary. In this study, nondestructive evaluation technique for pyroshock propagation estimation using hydrocodes is proposed. First, pyroshock propagation is numerically analyzed using AUTODYN, a commercial hydrocodes. Hydrocodes can handle stress wave propagation including elastic, plastic, and shock wave in the time domain. Test structures are modeled and pyroshock time history is applied to where the pyroshock propagation originates. Numerical NDE results of pyroshock propagation on test structures are analyzed in terms of acceleration time histories and acceleration shock response spectra (SRS) results. To verify the proposed numerical methodology, impact tests using airsoft gun are performed. The numerical analysis results for the impact tests are compared with experimental results and they show good agreements. The proposed numerical techniques enable us to nondestructively characterize pyroshock propagation.

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