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All Journal Rotasi Teknika: Jurnal Sains dan Teknologi Emerging Science Journal Civil Engineering Journal Mekanika: Majalah Ilmiah Mekanika Abdi Masya
Eko Surojo
Universitas Sebelas Maret Surakarta
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Other

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Frictional Characterization Of Grey Cast Iron Train Brake Block Using A Reduced Scale Dynamometer Utama, Bernardus Prasetya; Budiono, Herru Santoso; Surojo, Eko; Muhayat, Nurul
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 ¼ 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.
Magnesium Addition and Treatment of Reinforcement Particles in Al6061 – Sea Sand Composite on Coefficients Friction and Wear Rate Akbar, Hammar Ilham; Atmaja, Muhammad Ilham Arbi; Surojo, Eko; Kusharjananta, Bambang; Fanani, Reza Aldiansyah
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.78335

Abstract

Aluminium matrix composite is a composite material that can be used as reinforcement to increase the tribological properties of composite. The process of manufacturing the Al6061-Sea sand composite used the stir casting method with stirring time of 10 minutes and speed of 600 rpm. Stir casting specimens were manufactured with height dimension of 20 mm and diameter of 10 mm. After that, the specimen was friction tested using the pin on disc method. The highest coefficient of friction was the specimen without electroless coating with the addition of 2 wt% Mg of 0.634. The more mass fraction of sea sand, the higher the porosity, and the lower the density. An electroless coating process can be carried out on reinforcing particles. This study aims to determine the effect of addition of Mg and treatment of reinforcing particles on the Al6061-Sea sand composite on the coefficient of friction and wear rate. The coefficient of friction, the specimen density increased, the porosity and the wear rate, decreased. This occurred because the reinforcement particle size of sea sand bonded strongly to aluminium matrix. The highest coefficient of friction was the electroless coating with the addition of 2 wt% Mg of sea sand, which was 0.646.
The Effect of Stirrer Depth And Electroless Coating of Hardness And Tensile Strength in Aluminium Matrix Composite AL6061-AL2O3 Andini, Sukma; Surojo, Eko; Triyono, Teguh
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i1.48073

Abstract

Metal Matrix Composite (MMC) are composite materials that are widely used in the industrial sector. Examples of metal matrix composites are Al6061 as matrix alloys and Al2O3 as reinforcement. In general, making Al6061-Al2O3 composites using the stir casting method. This research was conducted to determine the effect of the depth of stirring and electroless coating treatment on the hardness and tensile strength of Al6061-Al2O3 composites. The process of making composites with Al2O3 reinforcing particles with 6% weight fraction mixed with aluminium alloys and 2.5% magnesium powder as a wetting agent. Variations of this study were the depth of the stirrer and electroless coating treatment. The depths of stirring used for the experiment were 30%, 45%, and 60% of the height of the fluid. The testing phases in this study were the density and porosity test, metallographic observation, hardness test, and tensile test. The most efficient variation of the mixer depth was obtained at a mixer depth of 30% of the fluid height. The highest hardness and tensile strength test results are hardness value of 72.43 Brinell Hardness (HB) and tensile strength of 182.19 MPa with electroless coating reinforcement treatment.
The Effect of Fumigation and Alkalization on Dimensional Changes of Cantula Fiber Reinforced Unsaturated Polyester Composites Under Immersion Wibowo, M. Ihsan Tri; Ariawan, Dody; Surojo, Eko
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 Adie, Prayoga Wira Aditya Rio Prabowo Agiel, Raiddin Muhamad Agus Suprihanto Akbar, Hammar Ilham Andini, Sukma Anwar Nurharyanto Atmaja, Muhammad Ilham Arbi Bambang Margono Bintoro, Sefrian R. Budiono, Herru Santoso Carvalho, Hermes Chamim, Moch. Djordjevic, Branislav Dody Ariawan Fanani, Elvira Wahyu Arum Fanani, Reza Aldiansyah Halim, Dimas Ardiansyah Harjo Seputro, Harjo Ilham Habibi, Ilham Kusharjananta, Bambang Majid, Faishal M. Muhammad Ghozali Nurul Muhayat Pramudi, Ganjar Raharjo, Wijang W. Ramadhan, M. Rafidya Bintang Salim, Muhamad Saifuddin Sholehuddin, Muhammad Ilham Sukmaji Indro Cahyono, Sukmaji Indro Teguh Triyono Triyono Triyono Triyono Utama, Bernardus Prasetya Wibowo, M. Ihsan Tri