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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika
Eko Surojo
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Aerospace Engineering Automotive Engineering Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Journal : Mekanika: Majalah Ilmiah Mekanika

 1 
Study Pengaruh Kecepatan Pengadukan pada Proses Stir Casting terhadap Sifat Fisik dan Mekanik AMC Berpenguat Pasir Silica yang Dilakukan Proses Electroless Coating teguh triyono; Abdul Latief Al Yusron; eko Surojo
Mekanika: Majalah Ilmiah Mekanika Vol 19, No 1 (2020): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v19i1.40248

Abstract

Penggunaan material dengan bahan komposit mulai banyak dikembangkan dalam industri manufaktur. Bahan komposit memiliki banyak keunggulan, diantaranya lebih ringan, kekuatan lebih tinggi, tahan korosi dan biaya perakitan yang lebih murah. Penelitian ini dilakukan untuk mengetahui pengaruh kecepatan pengadukan pada proses stirr casting terhadap sifat fisik dan mekanik pada komposit matriks aluminium (AMC) berpenguat pasir silica yang di-electroless coating. Proses stirr casting dilakukan dengan variasi kecepatan pengadukan 300, 400, 500 rpm selama 5 menit pada temperatur semi solid. Fraksi volume pasir silika  yang digunakan sebanyak 9% serta penambahan Mg dengan fraksi volume 2,5%. Temperatur penuangan 725ºC dan bahan matrik yang digunakan adalah remelting piston bekas . Pengujian impak charpy menggunakan standar ASTM E-23 dan kekuatan tarik menggunakan standar ASTM E-8. Meningkatnya variasi kecepatan pengadukan dan pengaruh perlakuan pasir silica yang di electrolis coating akan meningkatkan kekuatan impak dan kekuatan tarik . Rata rata nilai impak dan kekuatan tarik paling tinggi didapat pada spesimen dengan kecepatan pengadukan 500 rpm dengan temperatur tuang 725ºC (117,88 N/mm² dan 0,56 J/mm²). Pengujian struktur mikro menunjukan bahwa kecepatan pengadukan mempengaruhi penyebaran partikel penguat.
The Effect of Stirrer Depth And Electroless Coating of Hardness And Tensile Strength in Aluminium Matrix Composite AL6061-AL2O3 Sukma Andini; Eko Surojo; Teguh Triyono
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. The stirring parameter in the stir casting affects the physical and mechanical properties of the composites. The physical and mechanical properties of composites can be improved by increasing the wettability of the reinforcement. 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 aluminum 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 HBN and tensile strength of 182.19 MPa with electroless coating reinforcement treatment
STUDI KARAKTERISTIK KAMPAS REM KENDARAAN PENUMPANG TYPE OES (ORIGINAL EQUIPMENT SPAREPART) DAN AM (AFTER MARKET) PADA DRY DAN WET SLIDING Rovilla Kennedy; Eko Surojo; Wijang Wisnu Raharjo
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 1 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i1.35043

Abstract

Brake pad is one of the components of a motor vehicle which is served to slow or stop the rate of vehicle. The brake pad of automotive vehicle on the market is divided into three types that are an OEM (original equipment manufacturer), OES (original equipment spare parts) and AM (aftermarket). The brake pad operates under various conditions of dry or wet sliding. The majority of researchers investigated brake pad characteristic on dry sliding. Studies of wet braking behavior are rare in the tribology literature. Therefore, this research performed testing of friction characteristics of dry and wet sliding by using brake pad type OES and AM on a passenger vehicle. Each brake pad tested using the machine pin on disc tribometer type and observed using SEM. The result showed that the brake pad type OES has a good stability on testing dry sliding and wet sliding. In addition, passenger type brake pad OES has specific wear low so more durable in used. Meanwhile the results of SEM showed that the friction layer were not formed during wet sliding.
Effect of Filler on Shear Strength and Electrical Conductivity in Epoxy Based Aluminium Bonded Cahyo Yuniwantoro; Eko Surojo; Dharu Feby Smaradhana; Fitrian Imaduddin
Mekanika: Majalah Ilmiah Mekanika Vol 19, No 1 (2020): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v19i1.39903

Abstract

Adhesive joint is one of the material joining techniques using a low temperature with the help of polymer adhesives to connect a material. This connection is widely used in infrastructure, automotive and electronics industries. This research was conducted to determine the effect of filler on shear strength and electrical conductivity on epoxy-based aluminum connections. The fillers used were aluminum powder, iron powder, copper powder with a grain size of 0.071 mm each and nanogold particles in liquid form. The connection type used is a single lap joint with an end tab modification at the end of the connection. The highest shear strength value is in the joint without the addition of filler of 3.17 MPa and the lowest value is in the connection with the addition of aluminum powder filler of 1.14 MPa. The highest value of electrical conductivity was obtained in epoxy mix with nanogold particle filler which was worth 13.1 S / m and the value for epoxy without the addition of filler was not detected because the resistance was too large. This shows that the addition of filler has an effect on the value of shear strength, which is to reduce the value of the shear strength, while for testing the conductivity of electricity the addition of filler has an effect to provide electric properties on epoxy.
The Effect of Alkali Treatment And Microcrystalline Cellulose Addition on Density Value of Cantala Fiber Reinforced Unsaturated Polyester Composites Muhammad Ghozali; Dody Ariawan; Eko Surojo
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.v20i1.47460

Abstract

Natural fiber reinforced composites is one materials potentially developing in Indonesia. One of biggest problem with composites specimen is its void. One properties to find out void of composites is composites density value. The objective of research is to investigate the effect of fiber alkali (NaOH) treatment and microcrystalline cellulose (MCC) addition on density value of cantala fiber reinforced unsaturated polyester composites. Firstly, cantala fibers was submerged into alkali (NaOH) 6% solution for 0, 3, 6, 9, and 12 hours. Furthermore, the fiber was washed using acetid acid and then using clean water to reach pH 7. Thereafter, cantala fiber was dried in the oven for 10 hours at temperature 600C. Composites was composed of cantala fiber, unsaturated polyester polymer matrix, and microcrystalline cellulose according to the composition with volume fraction 30%. Composites was casted using compression molding method with compressive strength of 10 MPa for 12 hours. All specimens of composites undertake post cure for 2 hours at 600C. Density test was conducted using densimeter by calculating the density of composites in the air and the water. The result of research showed that the longer the alkali treatment time and the more addition of microcrystalline cellulose (MCC) filler, the higher is the composites density. The higher density value of cantala fiber reinforced unsaturated polyester is alkali treatment 6 hours, which was 1.223 gr/cm3.
Effect of Alkaline Treatment and Fumigation on the Mechanical Properties of Fiber Unsaturated Polyester-Cantula Composite with Compression Molding Method Muhamad Saifuddin Salim; M. Rafidya Bintang Ramadhan; Elvira Wahyu Arum Fanani; Dody Ariawan; Eko Surojo
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.51493

Abstract

This research examines the strength of the UPRs-Cantula composite with theaddition of filler microcrystalline cellulose (MCC). Composites were createdwith a volume fraction of 30% Vf and a 45° angle. This angle variation receivedthe same treatment as the others, including untreated, alkaline, and fumigation.The treatment time for alkali treatment was 6 hours, while the treatment timefor fumigation was 10 hours. The strength of each angle variation wasdetermined, as well as its treatment of tensile strength, modulus of elasticity,and Poisson's ratio UPRs-cantula composites. According to the results, thealkali treatment produced the highest tensile strength and elastic modulusvalues. The highest Poisson ratio value was discovered without treatment at a45°. The alkaline treatment yielded the highest tensile strength and modulus ofelasticity test results. The pullout fiber fracture dominated the untreatedcomposite fracture, whereas the fiber breakage fracture dominated the alkalinetreatment.
Co-Authors Abdul Latief Al Yusron Abdunnashir Dhiya'uddin Cahyo Yuniwantoro Dharu Feby Smaradhana Dody Ariawan Elvira Wahyu Arum Fanani Fitrian Imaduddin Ibrahim Fadli Joko Triyono M. Rafidya Bintang Ramadhan Muhamad Saifuddin Salim Muhammad Abdul Basyith Muhammad Ghozali Rovilla Kennedy Sukma Andini Syarif Hidayatulloh Teguh Triyono Teguh Triyono Wijang Wisnu Raharjo