Experimental and Numerical Study on Designing Pulse Shapers for Testing Rocks in Large-Diameter SHPB
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 4
Abstract
Rocks such as Kota sandstone are an excellent construction material. An experimental and numerical study was performed to test Kota sandstone in a large-diameter (76-mm) split Hopkinson pressure bar (SHPB) in a strain rate range of . The primary goal of the current study was to optimize pulse shaper dimensions for dynamic testing of rocks. Pulse shapers of diameters 10, 12, 15, 20, 25, and 30 mm and thicknesses 0.1, 0.5, 1.5, 2.5, 5, and 10 mm were used. It was found that the incident rise time increases and the maximum stress drops as the diameter or thickness increases. For a large-diameter SHPB, it is recommended to use a pulse shaper of diameter 15–20 mm and thickness 2.5 mm. These pulse shaper dimensions produce a ramp-like incident pulse that facilitates dynamic force equilibrium and constant strain rate loading in the rock specimens. Also, the inertia-induced stresses in the rock specimens are negligible. A thicker pulse shaper is suggested if higher strain rates are targeted. The inertia-induced stresses in the pulse shaper increase as its diameter increases and decrease as its thickness increases. Especially when the pulse shaper diameter is increased from 20 mm to 25 or 30 mm, the inertia-induced stresses become large enough to cause oscillations in the incident waves.
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Data Availability Statement
Some data, models, or code that support the findings of the study are available from the corresponding author upon reasonable request: dynamic test results of all Kota sandstone samples.
Acknowledgments
The authors thank the editor-in-chief, the two anonymous reviewers, and the editor for their valuable comments. It has helped to increase the quality of the manuscript immensely.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jan 22, 2022
Accepted: Jul 19, 2022
Published online: Jan 18, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 18, 2023
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