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Dynamic Friction Coefficient Measurement Using a New Torsion Split-Hopkinson Bar Technique.

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Title: Dynamic Friction Coefficient Measurement Using a New Torsion Split-Hopkinson Bar Technique.
Authors: Jarachi, M.1 (AUTHOR) mj1515@msstate.edu, Duncan, A.1 (AUTHOR), Zhang, L.1 (AUTHOR), Rhee, H.1 (AUTHOR), Hammi, Y.1 (AUTHOR), Kundu, S.2 (AUTHOR), Williams, B. A.3 (AUTHOR), Whittington, W. R.1 (AUTHOR)
Source: Experimental Techniques. Jun2026, Vol. 50 Issue 3, p413-424. 12p.
Subjects: Sliding friction, Hopkinson bars (Testing), Lubrication & lubricants, High-speed photography, Digital image correlation, Compressive force, Static friction
Abstract: In this work, a Torsional Split-Hopkinson Bar (TSHB) was modified for rotating thin-walled steel rings in contact with a concrete disk under static precompression. The modified TSHB has been calibrated using Digital Image Correlation (DIC) Vic 2D software in combination with a Photron Fastcam high-speed camera. Using this modified TSHB, the velocity-dependent coefficient of friction between C300 maraging steel and concrete has been investigated. Three high strength types of concrete have been studied either in dry and lubricated conditions. It has been established that the friction coefficient decreases first rapidly as a function of velocity and it seems to stabilize after a certain velocity. The effects of lubrication on the frictional forces can be seen in the consistent reduction of the friction coefficient. Moreover, two axial forces of 7 and 10 MPa were applied to assess their effect on the friction coefficient. It was found that under dry conditions, the coefficient of friction increases slightly as the applied normal pressure increases for fiber-reinforced concretes, but it decreases for unreinforced concrete probably due to its brittle behavior. Finally, the static friction coefficient, which is the first value recorded when the sliding motion is produced, was validated by the inclined plane method. All of these observations are in good agreement with the friction theory and offer proof of the validity of the modified TSHB test method. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this work, a Torsional Split-Hopkinson Bar (TSHB) was modified for rotating thin-walled steel rings in contact with a concrete disk under static precompression. The modified TSHB has been calibrated using Digital Image Correlation (DIC) Vic 2D software in combination with a Photron Fastcam high-speed camera. Using this modified TSHB, the velocity-dependent coefficient of friction between C300 maraging steel and concrete has been investigated. Three high strength types of concrete have been studied either in dry and lubricated conditions. It has been established that the friction coefficient decreases first rapidly as a function of velocity and it seems to stabilize after a certain velocity. The effects of lubrication on the frictional forces can be seen in the consistent reduction of the friction coefficient. Moreover, two axial forces of 7 and 10 MPa were applied to assess their effect on the friction coefficient. It was found that under dry conditions, the coefficient of friction increases slightly as the applied normal pressure increases for fiber-reinforced concretes, but it decreases for unreinforced concrete probably due to its brittle behavior. Finally, the static friction coefficient, which is the first value recorded when the sliding motion is produced, was validated by the inclined plane method. All of these observations are in good agreement with the friction theory and offer proof of the validity of the modified TSHB test method. [ABSTRACT FROM AUTHOR]
ISSN:07328818
DOI:10.1007/s40799-025-00822-4