An Investigation Into the Thermal Behavior of the Grooved Dry Friction Clutch

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Oday I. Abdullah ◽  
Josef Schlattmann
Keyword(s):  
Dry Friction ◽  
Three Dimensional ◽  
Heat Content ◽  
Friction Material ◽  
Area Ratio ◽  
Friction Clutch ◽  
Transient Simulations ◽  
Dry Friction Clutch ◽  
Element Technique ◽  
Nominal Contact Area

The heat generated during the sliding period at the initiation of engagement in friction clutches is considered to be one of the main reasons for the failure of the friction material. One way to reduce the risk of this problem is to increase the rate of heat transfer by convection or, in other words, reduce the heat content of the friction material (internal energy) and thereby increase the lifecycle of the friction clutch. In this paper, the finite element technique has been used to study the effect of radial circumferential grooves on the temperature distribution and the amount of energy transferred by convection for a dry friction clutch disk during a single engagement, assuming a uniform distribution for the thermal load between the contact surfaces (i.e., uniform wear on clutch surfaces). Three-dimensional transient simulations are conducted to study the thermoelastic coupling of the problem. The effect of the groove area ratio (GR, defined as the groove area divided by the nominal contact area) is investigated. Furthermore, this paper presents the equations for energy considerations and energy balance at any time for the friction clutch system. The numerical results show that the amount of energy transferred by convection from the friction material can be controlled (within a limitation) by adjusting the value of the groove area ratio. Commercial ANSYS13 software has been used to perform the numerical computations in this paper.

scholarly journals Micromechanical model of dry friction hybrid polymer composite clutch facings

2019 ◽  
Vol 4 (1) ◽  
pp. 335-340
Author(s):  
Roland Biczó ◽  
Gábor Kalácska
Keyword(s):  
Dry Friction ◽  
Micromechanical Model ◽  
Friction Material ◽  
Hybrid Polymer ◽  
Mechanical Stiffness ◽  
Clutch System ◽  
Friction Clutch ◽  
Dry Friction Clutch ◽  
Hybrid Polymer Composite ◽  
Tribological Contact

Modelling the complex coupled thermomechanical and tribological contact of a dry friction clutch system between cast iron flywheel and scatter-wound hybrid composite clutch facing requires a thought through investigation of the friction material properties and behaviour. Challenges of the creation of a mechanical stiffness matrix for such a complex material are described in this paper along with simplification ideas and solutions.

Analysis of friction-induced vibration leading to "EEK" noise in a dry friction clutch

2005 ◽  
Vol 53 (4) ◽  
pp. 138 ◽  
Author(s):  
Pierre Wickramarachi ◽  
Rajendra Singh ◽  
George Bailey
Keyword(s):  
Dry Friction ◽  
Friction Clutch ◽  
Dry Friction Clutch ◽  
Friction Induced Vibration

NUMERICAL AND FINITE ELEMENT CONTACT TEMPERATURE ANALYSIS OF FRICTION MATERIAL ’S TYPE EFFECT ON A THERMAL TRANSIENT BEHAVIOR OF A SINGLE-DISC DRY CLUTCH

Tribologia ◽  
2018 ◽  
Vol 271 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Majid Habeb FAIDH-ALLAH
Keyword(s):  
Finite Element ◽  
Transient Behavior ◽  
Friction Material ◽  
Sliding Velocity ◽  
Friction Materials ◽  
Clutch System ◽  
Friction Clutch ◽  
Dry Clutch ◽  
Element Technique ◽  
Contact Temperature Analysis

The sliding period is considered a critical period in the lifetime of friction clutches, because most failures occur during this period. High temperatures due to sliding velocity will appear on the contacting surfaces of the friction clutch system (e.g., in single -disc clutch are pressure plate, clutch discs and flywheel). The finite element technique has been developed to investigate the effect of the type of friction material (material properties) on the transient thermoelastic behaviour of a single-disc dry clutch. Two types of friction materials are used in this work: organic and sintered friction materials. Axisymmetric models are developed to simulate a friction clutch system (single disc with two effective sides). The results represent the comparisons between organic and sintered friction discs, behaviours during slipping periods in clutches.

scholarly journals Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3896
Author(s):  
Roland Biczó ◽  
Gábor Kalácska ◽  
Tamás Mankovits
Keyword(s):  
Dry Friction ◽  
Real Life ◽  
Friction Material ◽  
Energy Scale ◽  
Fiber Reinforced ◽  
Test Conditions ◽  
Test Parameters ◽  
Sorting Tests ◽  
Surface Microgeometry ◽  
Dry Friction Clutch

Wear and surface microgeometry aspects of fiber-reinforced hybrid composite dry friction clutch facings are revealed in a novel way: after different, real life automotive tests during their lifetime. This study examines and reveals the tribological response of friction material surfaces to real life application conditions with two different facing diameters and in two directions. Along the increasing activation energy scale, wear values increased according to two different trends, sorting tests into two main groups, namely ‘clutch killer’ and ‘moderate’. Wear results also highlighted the influence of mileage and test conditions, with clutch killer tests also creating considerable wear-more than 0.1 mm-at inner diameters: 1% higher wear was generated by 90% higher mileage; another 1% increment could be caused by insufficient cooling time or test bench-specific conditions. Surface roughness values trends varied accordingly with exceptions revealing effects of facing size, friction diameter and directions and test conditions: small (S) facings produced significantly decreased Rmax roughness, while large (L) and medium (M) size facings had increased roughness values; Rmax results showed the highest deviations among roughness values in radial direction; tests run with trailer and among city conditions resulted in more than 2% thickness loss and a 40–50% roughness decrease.

scholarly journals Analytical and Numerical Solutions for the Thermal Problem in a Friction Clutch System

Computation ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 122
Author(s):  
Laith A. Sabri ◽  
Katarzyna Topczewska ◽  
Muhsin Jaber Jweeg ◽  
Oday I. Abdullah ◽  
Azher M. Abed
Keyword(s):  
Numerical Solution ◽  
Numerical Solutions ◽  
Three Dimensional ◽  
Numerical Results ◽  
Three Dimensional Model ◽  
Thermal Problem ◽  
Friction Clutch ◽  
Dry Conditions ◽  
The Difference ◽  
Element Technique

The dry friction clutch is an important part in vehicles, which has more than one function, but the most important function is to connect and disconnect the engine (driving part) with driven parts. This work presents a developed numerical solution applying a finite element technique in order to obtain results with high precision. A new three-dimensional model of a single-disc clutch operating in dry conditions was built from scratch. As the new model represents the real friction clutch including all details, the complexity in the geometry of the clutch is considered one of the difficulties that the researchers faced using the numerical solution. The thermal behaviour of the friction clutch during the slip phase was studied. Meanwhile, in the second part of this work, the transient thermal equations were derived from scratch to find the analytical solution for the thermal problem of a clutch disc in order to verify the numerical results. It was found, after comparison of the numerical results with analytical results, that the results of the numerical model are very accurate and the difference between them does not exceed 1%.

scholarly journals Dry Friction Clutch Disc of an Automobile under Transient Thermal Load: A Comparison of Friction Lining Materials

2017 ◽  
Vol 124 ◽  
pp. 07003 ◽  
Author(s):  
Anosh Ali ◽  
Liaqat Ali ◽  
Samiur Rahman Shah ◽  
Mushtaq Khan ◽  
Syed Husain Imran ◽  
...  
Keyword(s):  
Dry Friction ◽  
Thermal Load ◽  
Friction Clutch ◽  
Dry Friction Clutch ◽  
Transient Thermal ◽  
Friction Lining
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