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All Journal Mekanika: Majalah Ilmiah Mekanika
Eko Surojo
Sebelas Maret University

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Frictional Characterization Of Grey Cast Iron Train Brake Block Using A Reduced Scale Dynamometer Bernardus Prasetya Utama; Herru Santoso Budiono; Eko Surojo; Nurul Muhayat
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48246

Abstract

The brake block is an essential component that slows down and stops the train. The safety of this transportation is very dependent on the reliability of this component. One of the essential features of the brake block material is the coefficient of friction. The coefficient of friction of the brake block material should fulfill the requirements. The coefficient of friction of a material is measured using a friction test. Many friction testing methods have been developed to study the characteristics of friction materials. In contrast to previous studies, in this study, the frictional characteristics of gray cast iron brake blocks were evaluated using a reduced scale dynamometer. The friction test is carried out by pressing the brake block specimen to the surface of the rotating wheel. The specimen size of the brake block and carriage wheels is reduced to ΒΌ of the original size. The friction test is carried out at a contact pressure of 0.15, 0.20, 0.25, and 0.30 MPa and the friction speeds of 3, 6, 9, and 12 m/s. This study indicates that the coefficient of friction of the gray cast iron brake block decreases with increasing sliding speed and contact pressure.
The Effect of Fumigation and Alkalization on Dimensional Changes of Cantula Fiber Reinforced Unsaturated Polyester Composites Under Immersion M. Ihsan Tri Wibowo; Dody Ariawan; Eko Surojo
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.49463

Abstract

This study investigates the effect of fumigation and alkaline treatment on dimensional change in cantala fibers reinforced Unsaturated Polyester Resins (UPRs) composite under immersion test in an aqueous environment. Composites were fabricated using the compression molding method with cantala fiber content of 30% vt with the addition of 5% microcrystalline cellulose. Composite specimens were immersed under aquades for two months at room temperature. The dimensional changes of cantala fiber-reinforced UPRs in different solutions followed a Fickian behavior. The dimensional change of composites in solution shows the saturation point after several weeks of immersion. Fumigation-treated fibers and alkali-treated fiber composites after immersion have lower results in dimensional changes and slope than untreated fiber composites.
Co-Authors Bernardus Prasetya Utama Dody Ariawan Herru Santoso Budiono M. Ihsan Tri Wibowo Muhayat, Nurul