A split Hopkinson pressure bar for experimental investigation of dynamic pulverization under very high strain rates

Eranga Gayanath Jayawickrama; Takuma Sekiguchi; Jun Muto; Sando Sawa; Hiroyuki Nagahama; Yoshio Kono; Kyung-Oh Bae; Hyung-Seop Shin

doi:10.1063/5.0151448

A split Hopkinson pressure bar for experimental investigation of dynamic pulverization under very high strain rates

Rev Sci Instrum. 2023 Sep 1;94(9):095110. doi: 10.1063/5.0151448.

Authors

Eranga Gayanath Jayawickrama^{1

2}, Takuma Sekiguchi¹, Jun Muto¹, Sando Sawa¹, Hiroyuki Nagahama¹, Yoshio Kono³, Kyung-Oh Bae^{4

5}, Hyung-Seop Shin⁶

Affiliations

¹ Department of Earth Science, Graduate School of Science, Tohoku University, 6-3, Aramaki Aza Aoba, Aoba, Sendai, Miyagi 980-8578, Japan.
² Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
³ Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
⁴ Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-Ro, Yuseong-Gu, Daejeon 34113, Republic of Korea.
⁵ PRETECH CO., LTD. 403-2 Sannoucho, Inage-ku, Chiba, 263-0002, Japan.
⁶ Department of Mechanical and Robotics Engineering, Andong National University, 1375, Gyeongdong-ro (SongCheon-dong), Andong, Gyeongsangbuk-do 36729, Republic of Korea.

PMID: 37724930
DOI: 10.1063/5.0151448

Abstract

Off-fault damage or pulverized rocks found in large-scale strike-slip faults are of great interest in earthquake research. In order to experimentally investigate rock pulverization, we developed a split Hopkinson pressure bar with compact dimensions and high-speed imaging. The developed experimental setup is capable of generating very high strain rates up to 1320 s-1 with the satisfaction of stress equilibrium, which are essential to reproduce the dynamic pulverization observed in nature and obtain dynamic stress-strain responses accurately. High-speed imaging revealed that cracks initiate and propagate along the grain boundaries at very high speeds, while the dynamic stress-strain response suggested that energy dissipated into the fracture increases with stronger impacts. In addition, we show that the apparatus is capable of producing particle size distributions partly similar to those in naturally pulverized rocks of large-scale strike-slip faults. Thus, our developed system with compact dimensions opens new ways to understand the dynamics of the rock pulverization in off-fault regions of large-scale strike-slip faults.