Tribology Online
Online ISSN : 1881-2198
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  • Ilham Taufik Maulana, Eko Surojo, Nurul Muhayat, Wijang Wisnu Raharjo
    2018 Volume 13 Issue 4 Pages 188-194
    Published: July 31, 2018
    Released: July 31, 2018
    JOURNALS FREE ACCESS

    Friction brake materials are made from a mixture of materials with different properties in order to meet the brake performance requirement. Friction brake material contains a reinforcement fiber that serves to maintain the integrity of the material when subjected to loading. Natural fiber has the potential to be used as a reinforcement material for friction material due to some of its superior characteristics. In this research, friction brake materials using cantala fibers were developed to investigate their frictional characteristics. The volume fraction of the cantala fibers in the specimens was varied from 0%, 4%, 8%, to 12% of the total composition of the friction brake material. The manufacturing of the specimen was initiated by mixing the ingredients, followed by cold pressing of the mixture, hot pressing of the preform, and finally post-curing of the specimens. The frictional characteristics of the specimens were evaluated using pin-on-disc tribometer. The result showed that the cantala fibers contributed to the decrease in the coefficient of friction. An increase in contact pressure caused the coefficient of friction to increase, while the increase in sliding speed caused a decrease in the coefficient of friction. The addition of cantala fiber into the composite could increase wear resistance and stabilize the coefficient of friction of the friction brake material.

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  • Jianzhong Cui
    2018 Volume 13 Issue 4 Pages 195-203
    Published: July 31, 2018
    Released: July 31, 2018
    JOURNALS FREE ACCESS

    The film flow between the disks is the critical factor in the design of hydro-viscous drive. In the previous work dealing with the flow in the gap, few authors considered the effect of non-isothermal interface on the flow. In order to investigate the dynamic behavior of the oil film between non-isothermal friction pair in hydro-viscous drive, the flow field of the oil film between the disks is presented with consideration of four representative temperature models. Parameters related to the flow, such as temperature, pressure, velocity, shear stress and viscous torque are obtained by means of numerical simulation. The results show that non-isothermal interface results in temperature distribution profiles that diverge from the ideal parabolic curve. Both the discrepancies about film pressure and radial velocity at the outlet are vulnerable to temperature variation derived from a set of frictional pair. Tangential velocity profiles diverge from inlet to outlet due to the non-isothermal interface. Shear stress profiles show the opposite trend caused by the substantial variation about the oil viscosity. The research results lay a theoretical foundation for the reasonable designs of hydro-viscous drive.

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