## THERMAL SCIENCE

International Scientific Journal

### Thermal Science - Online First

online first only
### Thermal behavior of double arc groove friction pairs in hydro-viscous drive under soft start-up condition

**ABSTRACT**

Three-dimensional transient heat conduction equations with boundary-value problems were established for numerical simulation to explore the thermal behavior of double arc groove friction pairs. The heat flux of the contact face decelerated with time, and its distributions were formulated with intensity proportional to the thermal parameters of the materials. Additionally, the theoretical expression of the friction disc's speed was deduced. Subsequently, a numerical solution was obtained using the finite difference method to predict the temperature field distributions of the friction pairs and to determine the location of the maximum temperature under different start-up times. The results indicate that the friction disc and steel disc are approximately similar regarding the temperature field distributions. However, the temperature and radial temperature gradient of the latter are several times those of the former. The central region temperatures for each rhombus at the surface of the friction disc are higher than those of the surrounding area. The longer the time to soft start-up is, the higher is the generated temperature, and the greater is the radial temperature gradient. The analysis results provide theoretical reference and technical support for the selection of the start-up time by considering the actual working conditions of scraper conveyor.

**KEYWORDS**

PAPER SUBMITTED: 2017-11-11

PAPER REVISED: 2017-01-12

PAPER ACCEPTED: 2018-01-20

PUBLISHED ONLINE: 2018-02-18

- Wei, C. G., Zhao, J. X., Technology of Hydro-Viscous Drive (in Chinese), National Defence Industry Press, Beijing, China, 1996
- Yevtushenko, A. A., et al., Numerical Analysis of Thermal Stresses in Disk Brakes and Clutches (a Review), Numerical Heat Transfer, Part A, Applications, 67 (2015), 2, pp. 170-188
- Zagrodzki, P., Truncone, S. A., Generation of Hot Spots in a Wet Multidisk Clutch During Shortterm Engagement, Wear, 254 (2003), 3, pp. 474-491
- Marklund, P., Larsson, R., Wet Clutch Friction Characteristics Obtained from Simplified Pin on Disk Test, Tribology International, 41 (2008), 9-10, pp. 824-830
- Marklund, P., et al., Thermal Influence on Torque Transfer of Wet Clutches in Limited Slip Differential Applications, Tribology International, 40 (2007), 5, pp. 876-884
- Hu, J. B., et al., A Uniform Cross-Speed Model of End-face Seal Ring with Spiral Grooves for Wet Clutch, Tribology International, 62 (2013), 6, pp. 8-17
- Ji, Z. L., et al., Elastoplastic Finite Element Analysis for Wet Multidisc Brake During Lasting Braking, Thermal Science, 19 (2015), 6, pp. 2205-2217
- Adamowicz, A., Grzes, P., Analysis of Disc Brake Temperature Distribution During Single Braking under Non-Axisymmetric Load, Applied Thermal Engineering, 31 (2011), 6-7, pp. 1003-1012
- Adamowicz, A., Grzes, P., Influence of Convective Cooling on a Disc Brake Temperature Distribution During Repetitive Braking, Applied Thermal Engineering, 31 (2011), 14-15, pp. 2177-2185
- Adamowicz, A., Grzes, P., Three-Dimensional FE Model for Calculation of Temperature of a Thermosensitive Disc, Applied Thermal Engineering, 50 (2013), 1, pp. 572-581
- Cui, H. W., Research on the Torque Characteristic of Friction Pairs in Hydro-Viscous Clutch (in Chinese), Ph. D. thesis, Beijing Institute of Technology, Beijing, China, 2014
- Cui, H. W., et al., Study on Fluid Torque by Shear Stress of Double Arc Oil Groove Friction Pairs in Hydro-Viscous Drive (in Chinese), Journal of Chongqing University, 39 (2016), 5, pp. 1-9
- Xie, F. W., et al., Numerical Simulation Research on Effect of Oil Groove Forms on Thermal Behavior of Friction Pair in Hydro-Viscous Clutch, Industrial Lubrication and Tribology, 68 (2016), 2, pp. 287-298
- Cui, J. Z., et al., Numerical Investigation on Transient Thermal Behavior of Multidisk Friction Pairs in Hydro-Viscous Drive, Applied Thermal Engineering, 67 (2014), 1, pp. 409-422
- Yevtushenko, A. A., et al., Three-Dimensional FE Model for the Calculation of Temperature of a Disc Brake at Temperature-Dependent Coefficients of Friction, International Communications in Heat and Mass Transfer, 42 (2013), pp. 18-24
- Belhocine, A., Numerical Investigation of a Three-Dimensional Disc-Pad Model with and without Thermal Effects, Thermal Science, 19 (2015), 6, pp. 2195-2204
- Belhocine, A., FE Prediction of Thermal Performance and Stresses in an Automotive Disc Brake System, International Journal of Advanced Manufacturing Technology, 89 (2016), 9, pp. 3563-3578
- Belhocine, A., Wan Omar, W.Z., Three-Dimensional Finite Element Modeling and Analysis of the Mechanical Behavior of Dry Contact Slipping Between the Disc and the Brake Pads, International Journal of Advanced Manufacturing Technology, 88 (2016), 1, pp. 1035-1051
- Belhocine, A., Bouchetara, M., Thermo-Mechanical Behavior of Dry Contacts in Disc Brake Rotor with a Grey Cast Iron Composition, Thermal Science, 17 (2013), 2, pp. 599-609
- Adamowicz, A., Axisymmetric FE Model to Analysis of Thermal Stresses in a Brake Disk, Journal of Theoretical and Applied Mechanics, 53 (2015), 2, pp. 357-370
- Hsu, T., The Finite Element Method in Thermomechanics, Allen & Unwin, Boston, 1986