Abstract
The contact characteristic between finger and objects changes due to the different deformation of a fingerprint when the finger slides in different directions. To understand this mechanism better, a new type of experimental setup was designed, and specific tests were conducted. We analyzed the regularity of the friction coefficient in two sliding directions. When the finger was sliding on surfaces with different roughness values, normal forces, and contact angles, the fingerprint deformation was captured by the Asana microscope. The following were inferred from the conducted experiments. Firstly, the friction coefficient decreases with increasing sample roughness and normal force. Secondly, the friction coefficient first decreases and then increases with increasing contact angle. Thirdly, the distance between the fingerprints increases when the finger is dragged, leading to an increase in contact area, thereby improving the friction coefficient. Finally, the result will be opposite to the previous inference when the finger is squeezed hard for fingerprinting.
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Acknowledgements
The authors would like to thank Professor G. X. Chen, of Southwest Jiaotong University, for helpful discussions. The authors are grateful for the financial support of the National Natural Science Foundation of China (No. 51675448, No. 51375408) and the Program for New Century Excellent Talents in University (NCET-13-0974).
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Zhang, M., Mo, J.L., Xu, J.Y. et al. The Effect of Changing Fingerprinting Directions on Finger Friction. Tribol Lett 65, 60 (2017). https://doi.org/10.1007/s11249-017-0843-7
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DOI: https://doi.org/10.1007/s11249-017-0843-7