According to the characteristics of working conditions and structures of sealing rings, a modeling method is presented to simulate the appearance of local hot bandings on the seal frictional pair. Based on the Galerkin finite element formulation, the physical models with non-uniform characteristics and coupling relationships of physical fields are built including heat conduction, heat flux, perturbations of temperature field and so on. The formulations about the thermal instability of local hot banding are transformed into the determinants of matrixes, and the solutions are carried out. The critical speeds for the appearances of hot bandings are obtained under different frictional conditions. And the relationship curves between the critical speed and frictional coefficient, elastic modulus, thermal conductivity, coefficient of thermal expansion, and sealing ring size are determined. In addition to the thermal conductivity, other factors have significant effects on the critical speed. Experimental investigations are performed in the sealing performance test rig, by comparison of numerical and experimental critical speed results to enable an assessment of the accuracy level. Scanning electron microscopy is utilized to examine the surface morphology of the sealing rings. The obvious banding scratches are observed on the sealing surface under the condition that the experimental speeds are greater than the calculated critical speeds, which agree well with the characteristics of hot bandings. The numerical and experimental results indicate the effectiveness of the finite element discrete model on simulations of the thermal instability.
GONG Ran
,
CHE Huajun
,
ZHANG He
,
XU Yi
. Finite Element Modeling on Appearance of Local Hot Bandings of Composite Sealing Ring and Relevant Influence Factors[J]. Journal of Mechanical Engineering, 2017
, 53(23)
: 157
-164
.
DOI: 10.3901/JME.2017.23.157
[1] GRONITZKI M, POLL G W G. Optimization of the tribological performance of rectangular seals in automotive transmissions[J]. Proc IMechE Part J:Journal of Engineering Tribology, 2007, 221(3):259-270.
[2] 赵星宇,刘莹,高志,等. 自适应接触式机械密封性能研究[J]. 机械工程学报, 2015, 51(15):9-19. ZHAO Xingyu, LIU Ying, GAO Zhi, et al. Sealing performance of adaptive contacting mechanical seal[J]. Journal of Mechanical Engineering, 2015, 51(15):9-19.
[3] JAISWAL R, JHA R A, KARKI A, et al. Structural and thermal analysis of disc brake using solidworks and ansys[J]. International Journal of Mechanical Engineering and Technology, 2016, 7(1):67-77.
[4] OSTERMEYER G P, BODE K. A comprehensive approach for the simulation of heat and heat-induced phenomena in friction materials[J]. Wear, 2014, 311(1-2):47-56.
[5] ABDULLAH M A S. Transient behavior of initial perturbation in multidisk clutch system[J]. Tribology Transactions, 2014, 57(6):1164-1171.
[6] 孟德建,张立军,阮丞,等. 摩擦引起的制动器热点问题综述[J]. 同济大学学报, 2014, 42(8):1203-1210. MENG Dejian, ZHANG Lijun, RUAN Cheng, et al. Literature survey of friction-induced hot spots in brakes[J]. Journal of Tongji University, 2014, 42(8):1203-1210.
[7] AL-SHABIBI A M, BARBER J R. Transient solution of a thermoelastic instability problem using a reduced order model[J]. International Journal of Mechanical Sciences, 2002, 44(3):451-464.
[8] ZHAO J X, MA B, LI H Y, et al. The effect of lubrication film thickness on the thermoelastic instability under fluid lubricating condition[J]. Wear, 2013, 303(1):146-153.
[9] JANG J Y, KHONSARI M M. On the formation of hot spots in wet clutch systems[J]. Journal of Tribology, 2002, 124(2):336-345.
[10] DU S Q, ZAGRODZKI P, BARBER J R, et al. Finite element analysis of frictionally-excited thermoelastic instability[J]. Journal of Thermal Stresses, 1997, 20(2):185-201.
[11] ABBASI S, TEIMOURIMANESH S, VERNERSSON T, et al. Temperature and thermoelastic instability at tread braking using cast iron friction material[J]. Wear, 2014, 314(1):171-180.
[12] PANIER S, DUFRENOY P, WEICHERT D. An experimental investigation of hot spots in railway disc brakes[J]. Wear, 2004, 256(7):764-773.
[13] MAJCHERCZAK D, DUFRENOY P, BERTHIER Y. Tribological, thermal and mechanical coupling aspects of the dry sliding contact[J]. Tribology International, 2007, 40(5):834-843.
[14] DECUZZI P, CIAVARELLA M, MONNO G. Frictionally excited thermoelastic instability in multi-disk clutches and brakes[J]. Journal of Tribology, 2001, 123(4):865-871.
[15] ZAGRODZKI P. Thermoelastic instability in friction clutches and brakes-transient modal analysis revealing mechanisms of excitation of unstable modes[J]. International Journal of Solids and Structures, 2009, 45(11-12):2463-2476.
[16] YI Y B, DU S Q, BARBER J R, et al. Effect of geometry on thermoelastic instability in disk brakes and clutches[J]. Journal of Tribology, 1999, 12(4):661-666.
[17] CRISTOL-BULTHÉ A L, YANNICK D, GÉRARD D. Coupling between friction physical mechanisms and transient thermal phenomena involved in pad-disc contact during railway braking[J]. Wear, 2007, 263(7):1230-1242.
[18] GRAF M, OSTERMEYER G P. Hot bands and hot spots:Some direct solutions of continuous thermoelastic system with friction[J]. Physical Mesomechanics, 2012, 15(5-6):306-315.
[19] YEO T, BARBER J R. Finite element analysis of the stability of static thermoelastic contact[J]. Journal of Thermal Stresses, 1996, 19(2):169-184.
[20] GONG R, LIU M, ZHANG H, et al. Experimental investigation on frictional behavior and sealing performance of different composites for seal application[J]. Wear, 2015, 342(11):334-339.
[21] LEE K, BARBER J R. An experimental investigation of frictionally-excited thermoelastic instability in automotive disk brakes under a drag brake application[J]. Journal of Tribology, 1994, 116(3):409-414.
[22] 宫燃,车华军,李洪武,等. 等温密封环摩擦状态演变预测与试验研究[J]. 机械工程学报, 2011, 47(17):66-71. GONG Ran, CHE Huajun, LI Hongwu, et al. Prediction and experimental research on evolution for frictional contact of isothermal sealing ring[J]. Journal of Mechanical Engineering, 2011, 47(17):66-71.
