Volume 46, No 1, 2024, Pages 141-150

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Experimental Investigation of Thermal Effect on the Frictional Characteristics of HCC Friction Clutch Material


Nazar Al-Karkhi , Nadica Stojanovic , Salah Al-Zubaidi , Muhsin Jaber Jweeg , Hakim S. Sultan , Azher M. Abed , Oday I. Abdullah ,

DOI: 10.24874/ti.1465.03.23.12

Received: 25 March 2023
Revised: 8 May 2023
Accepted: 12 December 2023
Published: 15 March 2024


Increasing temperature due to frictional heat from sliding between contacting surfaces leads to increased wear and friction. Therefore, the researchers continue investigations to find the most suitable friction materials with good mechanical and thermal properties for frictional facings of clutch performance under this condition. In this research paper, the behavior and performance of the friction material HCC was studied under different normal load conditions (125, 175, 225, and 275 N) and different working environment temperatures (300 K and 390 K), where the rotation speed was 300 rpm. The results of the coefficient of friction and friction forces variation under different working conditions were analyzed and discussed in detail. XTM 500 tribometer test rig was used to perform the required tests, and the samples were made of the HCC friction material. The obtained results proved that the ambient temperature of the friction system has a significant negative effect on both the coefficient of friction and the force of friction. So, when the friction system's ambient temperature increases, the magnitude of the friction coefficient will decrease, and, thus, the transmitted torque will reduce too.


Frictional characteristics, Friction material, Thermal effect

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Volume 46
Number 1
March 2024

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