Article Per Year (5 Year)
p-Index From 2021 - 2026
2.63
P-Index
This Author published in this journals
All Journal Rotasi Teknika: Jurnal Sains dan Teknologi Semesta Teknika E-Dimas: Jurnal Pengabdian kepada Masyarakat Emerging Science Journal Civil Engineering Journal Adimas : Jurnal Pengabdian Kepada Masyarakat Mekanika: Majalah Ilmiah Mekanika Jurnal Nasional Teknologi Terapan Abdi Masya Journal of Mechanical Engineering Automotive Experiences METAL : Jurnal Sistem Mekanik dan Termal Jurnal Foundry
Eko Surojo
Universitas Sebelas Maret Surakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

Published : 20 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 20 Documents
Search

 1   2 
PROSES SEMISOLID FORMING Surojo, Eko; Suprihanto, Agus
ROTASI Volume 3, Nomor 2, April 2001
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1431.456 KB) | DOI: 10.14710/rotasi.3.2.12-20

Abstract

This paper presents a semisolid forming process as a new process that can replace conventional casting andforming process. Semisolid forming process is metal procesing in semisolid state. There are several advantages of thisprocess. The important of these is non-turbulent filling of the die. Non-turbulent die fill in the process can eliminate airentrapment encountered in the conventional die casting. The semisolid forming process also offers the near net shapecapabilities of die casting and produces parts with less shrinkage porosity and macrosegregation. The limitation ofsemisolid forming process is this process requires globular (non-dendritic) structure alloys for raw material process.
Perbandingan Nilai Kekerasan Baja Karbon Rendah pada Proses Pack Carburizing dengan Media Arang Sekam Padi dan Arang Tempurung Kelapa Anwar Nurharyanto; Dimas Ardiansyah Halim; Eko Surojo
Jurnal Teknika Vol 15, No 1 (2019): Edisi Juni 2019
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v15i1.6009

Abstract

Analisis Artificial Aging dan Perlakuan Electroless Coating Terhadap Karakteristik Gesek dan Kekerasan Komposit AA6061-Al2O3 Hanif Rinaldi; Eko Surojo; Teguh Triyono; Hammar Ilham Akbar
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13448

Abstract

Komposit merupakan bahan rekayasa yang terdiri dari dua bahan yaitu matrik dan penguat. Komposit matriks aluminium merupakan salah satu jenis komposit matriks logam yang banyak digunakan dalam dunia otomotif dan konstruksi. Penelitian ini menggunakan AA6061 dan Al2O3 yang bertujuan untuk mengetahui pengaruh perlakuan panas dan electroless coating terhadap karakteristik gesek dan kekerasan komposit AA6061-Al2O3. Pembuatan komposit menggunakan metode stir casting. Perlakuan panas dilakukan dalam tiga tahap. Variasi dari penelitian ini adalah waktu penahanan yaitu 2-6 jam. Waktu penahanan optimum pada proses artificial aging terjadi pada 4 jam. Hasil pengujian menunjukkan bahwa kombinasi perlakuan electroless coating pada partikel dan 4 h artificial aging menghasilkan kekerasan tertinggi 56,70 BHN, koefisien gesek 0,543 dan keausan spesifik terendah 1,25x10-4 mm3/Nm. Hasil karakterisasi gesekan dan pengujian kekerasan membuktikan bahwa perlakuan electroless coating efektif dalam meningkatkan kekerasan dan karakteristik gesekan yang unggul pada komposit AA6061-Al2O3.
Perancangan Dinamometer Skala Kecil untuk Pengujian Karakteristik Gesek Bahan Blok Rem Kereta Api Rizal Akhmad Bukhori; Eko Surojo; Nurul Muhayat
Jurnal Nasional Teknologi Terapan (JNTT) Vol 2, No 3 (2018): NOVEMBER
Publisher : Penelitian dan Pengabdian Kepada Masyarakat Sekolah Vokasi Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (277.729 KB) | DOI: 10.22146/jntt.44937

Abstract

The brake blocks are components of the railway braking system that are useful for reducing speed or stopping the railway. In the development of railway brake block material needs a device that capable of testing the characteristics of the brake block material. One of the important characteristics of the brake block material is the frictional characteristic. The method of testing the frictional characteristics of existing brake blocks include using the pin on disc method, direct testing on the railway and using a full-scale dynamometer. The full-scale dynamometer has advantages than other methods because it can test specimens according to the actual railway braking conditions in a short time and less preparations. However, with the same specimen size as the original, the cost of making the specimen and the full-scale dynamometer become expensive. Therefore, to reduce the cost of making device and test specimens, this study will design the dynamometer small-scale brake block testing. This paper use Pahl and Beitz design method which divides the design into four stages: clarification of the task, conceptual design, embodiment design, and detail design. This dynamometer is designed by considering function designs, structures, and forces that are adapted to the brake block contact pressure according to the original conditions. This dynamometer is designed to vary material, wheel speed, and contact presssure with the output of measurement of friction coefficient of brake block material. Brake block test specimens have a reduced size with a 1: 4 scale from their original size. The results obtained from this research are engineering drawings and dynamometer test model of railway braking.
ANALISIS PENGUJIAN POROSITAS TERHADAP HASIL POST CURING KOMPOSIT KAMPAS REM Herru Santosa Budiono; Eko Surojo; Nurul Muhayat; Ikhwan Taufik
Journal of Mechanical Engineering Vol 4, No 2 (2020): Journal of Mechanical Engineering
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/jom.v4i2.3414

Abstract

Bahan pembuatan kampas rem biasanya terbuat dari bahan asbestos, namun bahan tersebut memiliki banyak efek negatif terutama untuk kesehatan. Karena itu dikembangkan sebuah material yang ramah lingkungan dan juga memenuhi syarat untuk bahan kampas rem. Penggunaan material alam yaitu serat cantula yang dipadukan dengan phenolic resin dan juga bahan lainnya menghasilkan sebuah komposit kampas rem yang tidak kalah kuat dan juga ramah lingkungan. Bahan phenolic resin akan menghasilkan gas ammonia ketika bahan itu terkena panas. Gas ammonia yang terbentuk didalam material dapat mengakibatkan internal defect yang dapat menurunkan kekuatan material. Untuk itu dilakukan treatment tambahan untuk menghilangkan gas ammonia. Post curing adalah sebuah treatment yang berfungsi untuk meningkatkan kekuatan dari material, dan juga digunakan untuk membuang gas ammonia yang terbentuk. Spesimen uji dibuat dengan memvariasikan lama proses post curing. Pengujian bending, foto makro dan SEM sudah dilakukan pada pada penelitian sebelumnya untuk mengtahui efek dari post curing pada kekuatan material. Pengujian porositas dilakukan untuk menunjang kesimpulan dari penelitian sebelumnya. Hasilnya menunjukan bahwa post curing memberikan pengaruh pada pembentukan porositas didalam material komposit.
Pengaruh Media Pendingin pada Perlakuan Panas T6 terhadap Kekuatan Tarik dan Struktur Mikro Komposit Al6061-Pasir pantai Hafidh Rawi Mufti; Hammar Ilham Akbar; Eko Surojo; Wibowo Wibowo; Teguh Triyono; Sukmaji Indro Cahyono; Nurul Muhayat; Triyono Triyono
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.197 KB) | DOI: 10.25077/metal.5.2.51-59.2021

Abstract

Al6061-sea sand composite was manufactured using the stir casting method and its mechanical properties were improved by heat treatment. The T6 heat treatment used to improve the mechanical properties of the composite consists of the following processes: solution heat treatment, quenching, and artificial aging. The solution heat treatment process was carried out at a temperature of 540oC for 6 hours. The quenching process was carried out with different quenching agents (water, oil, and 10% brine). The difference in quenching agents resulted in different cooling rates. After quenching, an artificial aging process was carried out at a temperature of 200 oC for 4 hours. The difference in cooling rate affects the hardness and tensile strength of the specimen. The high cooling rate results in an increase in the tensile strength of the specimen. This is due to the increase in cooling speed, the Mg2Si precipitates formed are smaller in size and located in the grains. The highest tensile strength of specimen (206.67 MPa) is obtained by using brine quenching agent.
Rancang Bangun Alat Olahraga Luar Ruang untuk Pengembangan Integrasi Wisata Alam-Olahraga Sukmaji Indro Cahyono; Triyono Triyono; Nurul Muhayat; Eko Surojo; Teguh Triyono
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 13, No 2 (2022): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v13i2.6703

Abstract

Kemajuan teknologi yang membawa kemudahan bagi manusia untuk bekerja, berbelanja, dan berwisata. Berdasarkan data dari kementrian Pariwisata telah terjadi pergeseran pilihan wisata yang diinginkan masnyarakat beberapa tahun belakangan ini seiring kesadaran untuk hidup sehat dengan berolahraga. Wisata olahraga menjadi tren tujuan wisata baru yang terintegrasi dengan wisata alam. Wisata ini berpotensi untuk dikembangkan area wisata Gunung Pegat desa Karangasem Sukoharjo. Permasalahan pada pengembangan wisata Alam-olahraga pada Gunung Pegat terkendala oleh infrastruktur di kawasan tersebut.  Inovasi pembangunan infrastruktur taman rekreasi yang dilengkapi alat olahraga outdoor (luar ruang). Program PKM ini akan difokuskan pada rancang bangun alat olahraga Outdoor yang sesuai dengan kondisi alam dan budaya olahraga masyarakat. Pelaksanaan perancangan hingga manufaktur dilaksanaan di lingkungan kampus. Prototipe yang telah dibangun ditempatkan di area wisata sebagai percontohan bagi warga dalam mengembangkan produk serupa. Pembangunan alat olahraga outdoor diharapkan dapat meningkatkan roda perekonomian warga Desa Karangasem, Bulu-Sukoharjo.
Mitigation of Porosity and Residual Stress on Car Body Aluminum Alloy Vibration Welding: A Systematic Literature Review Saifudin Saifudin; Nurul Muhayat; Eko Surojo; Yupiter HP Manurung; Triyono Triyono
Automotive Experiences Vol. 5 No. 3 (2022)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.7965

Abstract

Fatigue resistance is influenced by porosity and residual stress in welded joints. Fatigue failure in some means of transportation is caused by the inability to withstand the load received from the car body and passengers while operating. This study uses a systematic literature review (SLR) method to identify the effect of vibration welding on porosity and residual stress. Vibration can reduce the empty cavity (porosity) and increase the density of the weld. The ultrasonic vibration spot resistance (UVSR) method with 20 kHz on AA6082 is able to reduce residual stress up to 53% and is effective for homogenization of concentrated residual stress up to 57%.
Effects of Stir Casting Baffles on Hardness and Microstructure: Investigation of Designed Aluminum Composites Eko Surojo; Hammar Ilham Akbar; Dody Ariawan; Aditya Rio Prabowo; Teguh Triyono; Fahmi Imanullah
Civil Engineering Journal Vol 8, No 8 (2022): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-08-04

Abstract

The increasing demand for lightweight material specifications has forced researchers to develop lightweight materials that are inexpensive, can be produced on a large scale, and are environmentally friendly. One solution that has been developed is an aluminum composite reinforced with sea sand. Indonesia has the second longest coastline in the world, which means that the country is rich in maritime resources, one of which is sea sand. The ceramic contents of SiO2, SiC, and Al2O3allow sea sand to be used as a reinforcement in aluminum composites for engineering purposes. The most effective manufacturing method of AA6061–sea sand composites is stir casting, but the homogeneity and distribution of particles are the main disadvantages of the stir casting method. Various factors affect particle distribution and homogeneity, one of which is the flow during the stirring process. The increase in turbulent flow in the stirring process affects the homogeneity and distribution of the particles. One way to create a turbulent flow when stirring is to add baffles. This paper examines the effect of adding baffles during the stir casting process on the mechanical properties of AA6061–sea sand composites. The mechanical properties of AA6061–sea sand composites were characterized using the Brinell hardness test according to ASTM E-10. The test results show that the addition of baffles during the stir casting process decreases the hardness of the AA6061–sea sand composites due to the turbulent flow that occurs. This makes the material more porous, which makes the AA6061–sea sand composites less hard. Doi: 10.28991/CEJ-2022-08-08-04 Full Text: PDF
STUDI PENGARUH KOMPOSISI KIMIA DAN KETEBALAN CORAN TERHADAP STRUKTUR MIKRO BESI COR PADA KASUS PEMBUATAN BESI COR VERMICULAR Eko Surojo; Didik Djoko Susilo; Teguh Triyono; Nugroho Fajar Wicaksono
JURNAL FOUNDRY Vol. 2 No. 2 (2012): JURNAL FOUNDRY
Publisher : LPPM Politeknik Manufaktur Ceper

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Tujuan penelitian ini adalah mempelajari pengaruh komposisi kimia dan ketebalan coran terhadap struktur mikro besi cor pada kasus pembuatan besi cor vermicular. Besi cor vermicular menarik diteliti karena memiliki kekuatan dan keuletan yang lebih tinggi dibandingkan dengan besi cor kelabu, serta memiliki konduktivitas panas, sifat damping, ketahanan panas dan kekuatan fatik yang lebih baik dibandingkan dengan besi cor nodular. Akan tetapi yang masih menjadi permasalahan adalah ketika proses pengecoran diperlukan komposisi kimia dan laju pendinginan yang tepat agar dihasilkan besi cor bergrafit vermicular. Terkait dengan hal itu, pada penelitian ini dilakukan perbandingan struktur mikro terhadap hasil coran dari sampel yang memiliki komposisi kimia dan ketebalan coran yang berbeda. Bahan besi cor dilebur menggunakan tungku induksi dan proses pemaduan Mg dilakukan di dalam ladel. Hasil penelitian ini menunjukkan bahwa jika komposisi kimia besi cor (% Mg minimal) mampu mendorong terbentuknya grafit nodular maka terdapat kecenderungan semakin tebal coran menyebabkan semakin besarnya kemungkinan terbentuknya grafit vermicular. Pada komposisi besi cor 2,63 %C; 2,41 %Si; 0,428 % %Mn; 0,006 %S; 0,07 %Mg; 0,015 %Ti; 0,067 %Cr; 0,019 %Mo; 0,043 %Ni; 0,009 %Al; 0,006 %Co; 0,12 %Cu; 0,007 %V; 0,024 %W dan ketebalan coran 40 mm mampu menghasilkan besi cor berstruktur vermicular.
Co-Authors Adie, Prayoga Wira Aditya Rio Prabowo Aditya Rio Prabowo Agiel, Raiddin Muhamad Agus Suprihanto Akbar, Hammar Ilham Anwar Nurharyanto Bambang Kusharjananta Bambang Margono Bintoro, Sefrian R. Cahyo Hadi Wibowo Carvalho, Hermes Chamim, Moch. Didik Djoko Susilo Djordjevic, Branislav Dody Ariawan Fahmi Imanullah Hafidh Rawi Mufti Halim, Dimas Ardiansyah Hammar Ilham Akbar Hammar Ilham Akbar Hanif Rinaldi Harjo Seputro, Harjo Henri Fatih Wibowo Herru Santosa Budiono Ilham Habibi, Ilham Majid, Faishal M. Muhammad Ilham Arbi Atmaja Muhayat, Nurul Nugroho Fajar Wicaksono Nurul Muhayat Pramudi, Ganjar Raharjo, Wijang W. Reza Aldiansyah Fanani Rizal Akhmad Bukhori Rizki Dwi Ardika Saifudin Sholehuddin, Muhammad Ilham Sukmaji Indro cahyono Sukmaji Indro cahyono Sukmaji Indro Cahyono, Sukmaji Indro Sunardi Sunardi Taufik, Ikhwan Teguh Triyono Teguh Triyono Teguh Triyono Teguh Triyono Teguh Triyono Tohid Ghanbari-Ghazijahani Triyono Triyono Triyono Triyono Triyono Triyono Triyono Triyono Triyono Triyono Wibowo Wibowo Yupiter HP Manurung