Effect of Sliding Speed on the Thermal Stresses of Single-Disk Friction Clutches
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TECHNICAL ARTICLE—PEER-REVIEWED
Effect of Sliding Speed on the Thermal Stresses of Single-Disk Friction Clutches Oday I. Abdullah . Josef Schlattmann . Adolfo Senatore . Laith A. Sabri . Wassan S. Abd Al-Sahb
Submitted: 5 February 2020 ASM International 2020
Abstract The friction clutch is considered an essential machine element in the power transmission system, whereas the friction clutches are used widely in many applications of mechanical engineering, especially in the automotive vehicles. Most of failures happen in the elements surfaces of the clutch system due to the excessive heat generated through the early stage of the engagement period. In this paper, the finite element technique is applied to compute the variation of the heat generated due to friction, temperature and thermal stresses through the heating stage of the friction clutch. The simulation of working of the friction clutch has been accomplished using developed axisymmetric finite element models. The results present the distributions of frictional heat generated and thermal stress during the sliding period. The results proved that the non-uniformity of the pressure distribution is responsible for generating the high local frictional heat
O. I. Abdullah (&) Department of Energy Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq e-mail: [email protected] O. I. Abdullah J. Schlattmann System Technologies and Engineering Design Methodology, Hamburg University of Technology, Hamburg, Germany A. Senatore Department of Industrial Engineering, University of Salerno, Fisciano, Italy L. A. Sabri Department of Physics, Case Western Reserve University, Cleveland, USA W. S. A. Al-Sahb Mechanical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq
generated in some zones of nominal contact area through the heating stage and this will lead to a high increase in the thermal stresses. Keywords Thermal stresses Friction clutches Contact mechanics Finite element method
Introduction Previous analyses about the effective parameters affecting the thermo-elastic behavior of the friction clutch underlined the need of friction clutch with high resistance to high thermal stresses and wear. The high thermal stresses were considered the main cause that lead to failure in the contact surfaces of clutches such as surface cracks and dishing, material transfer and bond failure. When the friction clutch works under high thermal stresses for enough time, it may cause the premature damage to the clutch parts. Figure 1 illustrates the main elements of the dry friction clutch system responsible to transfer the torque from the driving shaft to the driven shaft. Barber et al. [1–7] examined different techniques to solve the thermo-elastic contact problem which included the frictional heat generated. One- and two-dimensional finite element models were developed to investigate thermal-contact problem of two disks through the sliding. Two cases are assumed: The first case when the speed is constant with time and th
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