The Effect of Applied Pressure Function on Thermo-elastic Problem in the Dry Friction Clutches
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TECHNICAL ARTICLE—PEER-REVIEWED
The Effect of Applied Pressure Function on Thermo-elastic Problem in the Dry Friction Clutches Nadica Stojanovic . Oday I. Abdullah . Zaure B. Rakisheva . Farkad A. Lattieff . Emad Talib Hashim
Submitted: 15 August 2020 / in revised form: 23 September 2020 / Accepted: 23 September 2020 ASM International 2020
Abstract The main purpose of this paper is to investigate deeply the effect the contact pressure function on the thermo-mechanical behavior of the friction clutch system during the slipping time (heating stage). The other purpose is to explore theoretically the complex interaction among the contact pressure, sliding speed and frictional characteristics of frictional facings to specify the magnitude and distribution of the frictional heating generation on the contact surfaces of the dry friction clutch under different applied pressure. It was developed a numerical code based on finite element method (ANSYS/APDL 2019) to determine accurately the contact pressure, temperature and frictional heat generated on contact surfaces of the friction clutch disc that has two effective frictional faces at any instant during the slipping period. It was found a significant effect of the magnitude and variation of applied pressure during the heating phase on the surface temperatures,
N. Stojanovic (&) Department for Motor Vehicles and Motors, Faculty of Engineering, University of Kragujevac, Kragujevac, Serbia e-mail: [email protected] O. I. Abdullah F. A. Lattieff E. T. Hashim Department of Energy Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq O. I. Abdullah Z. B. Rakisheva Department of Mechanics, Al-Farabi Kazakh National University, Al-Farabi Av. 71, 050038 Almaty, Kazakhstan
contact pressure and frictional heat generated. Where, the hot spot can be appeared when the applied pressure is constant. Under such circumstances, high amount of temperature and contact pressure focused on a small zone of the nominal contact area. This phenomenon is considered one of the main reasons for the early failure of the contacting surfaces of friction clutch. Keywords Dry friction clutch Frictional heating Contact pressure FEM Failure List of Symbols Q Heat, (W) h Convective heat transfer coefficient, (W/m2K) ts Slipping time, (s) p Contact pressure, (Pa) r Radius, (m) E Young’s modulus, (N/m2) k Thermal diffusivity, (m2/s) K Conductivity, (W/mK) Greek Symbols l Coefficient of friction, (–) x Angular sliding speed, (rad1) xo Initial angular sliding speed, (rad/s) t Poisson’s ratio, (–) r Stress components, (N/m2) a Thermal expansion, (K1) dij Kronecker delta, (–) q Density, (kg/m3) xo Initial angular sliding speed, (rad/s) Index gen.f Flywheel gen.c Clutch disc gen.p Pressure plate
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J Fail. Anal. and Preven.
Introduction The most exposed parts of the vehicle to the thermal loads are clutch and brake elements. These systems work based on the speed equalization due to friction, and the consequence of the friction is the heat generation on the cont
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