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

IF 1.8 4区工程技术 Q3 ENGINEERING, MECHANICAL

Experimental Techniques Pub Date : 2025-07-15 DOI:10.1007/s40799-025-00822-4

M. Jarachi, A. Duncan, L. Zhang, H. Rhee, Y. Hammi, S. Kundu, B. A. Williams, W. R. Whittington

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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.

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一种新型扭裂-霍普金森杆技术的动态摩擦系数测量

在这项工作中，扭转分裂-霍普金森杆（TSHB）被改进为在静态预压缩下与混凝土盘接触的旋转薄壁钢环。改进后的TSHB已使用数字图像相关（DIC） Vic 2D软件结合Photron Fastcam高速相机进行校准。利用这种改进的TSHB，研究了C300马氏体时效钢与混凝土之间的速度依赖摩擦系数。研究了三种高强度混凝土在干燥和润滑条件下的性能。结果表明，摩擦系数随速度的变化首先迅速减小，达到一定速度后趋于稳定。润滑对摩擦力的影响可以从摩擦系数的持续减小中看出。此外，还施加了7和10 MPa的轴向力来评估它们对摩擦系数的影响。研究发现，在干燥条件下，纤维增强混凝土的摩擦系数随着施加法向压力的增加而略有增加，而非纤维增强混凝土的摩擦系数则因其脆性而减小。最后，利用斜面法对产生滑动运动时记录的第一个静摩擦系数进行验证。这些结果与摩擦理论基本一致，证明了改进TSHB试验方法的有效性。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.