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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

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Tribological Performance of Polymer Composite Modified with Calcined Eggshell Particles Post High-Temperature Exposure Sunardi Sunardi; Dody Ariawan; Eko Surojo; Aditya Rio Prabowo; Tohid Ghanbari-Ghazijahani; Cahyo Hadi Wibowo; Hammar Ilham Akbar
Emerging Science Journal Vol 8, No 4 (2024): August
Publisher : Ital Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/ESJ-2024-08-04-03

Abstract

During operation, brake lining material rubs against the disc to generate heat. This heat could decrease the brake lining performance, such as the friction coefficient, specific wear rate, and interface temperature of the rubbing surfaces. The resulting wear debris is environmentally harmful and poses risks to human health. Therefore, this study aimed to replace the harmful material using eggshell particles as a filler in brake lining composite and enhance tribological properties. The brake lining samples were manufactured through three stages: cold compaction, hot compaction, and post-curing. The next step is the samples were subjected to a one-hour high-temperature exposure at 200°C, 300°C, 400°C, and 500°C. The results showed that the high-temperature exposure significantly affected the specific wear rate, friction coefficient, and interface temperature between the brake lining and disc. An interesting finding was that adding calcined eggshell particles in composite could improve the tribological properties up to 400°C. However, the best material’s performance resulted when the samples got an exposure temperature of 200°C. Doi: 10.28991/ESJ-2024-08-04-03 Full Text: PDF
RANCANGAN PENGABDIAN DALAM PEMBUATAN TEMPAT TIDUR TINGKAT TERINTEGRASI MEJA BELAJAR DI PONDOK PESANTREN Surojo, Eko; Triyono, Teguh; Muhayat, Nurul; Chamim, Moch; Margono, Bambang; Triyono
Abdi Masya Vol 1 No 3
Publisher : Pusat Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52561/abma.v1i3.143

Abstract

Pondok Pesantren adalah salah satu jenis tempat pendidikan formal maupun non formal yang selain memberi materi pelajaran agama juga mengajarkan adab hidup sehari-hari sehingga siswa/santri harus menginap di asrama selama proses pendidikan. Untuk itu, selain sarana prasarana pendidikan, pondok pesantren juga harus menyediakan sarana prasarana kehidupan sehari-hari seperti kamar dan tempat tidur, dapur, sarana olah raga dan lain sebagainya. Karena keterbatasan lahan dan bangunan, satu ruang asrama biasanya dihuni oleh 30-40 santri dengan menggunakan tempat tidur bertingkat. Karena ruang kamar asrama yang kurang memadai, santri biasanya belajar, membaca, mengerjakan Tugas Sekolah di atas tempat tidur. Untuk memberi kenyamanan dalam belajar santri, maka meja belajar yang dirancang terintegrasi dengan tempat tidur untuk menghemat ruang sangat penting untuk dilakukan. Rancangan tempat tidur tingkat terintegrasi dengan meja belajar berbahan dasar baja siku yang bisa dibongkar pasang dengan mudah karena system sambungannya dengan mur-baut. Alas tidur bagian bawah bisa dipisah setengah, lalu dilipat ke arah tiang tempat tidur dan meja belajar bisa didapatkan dengan membuka lipatan berikutnya. Desain ini digunakan untuk program pengabdian yang melibatkan kerjasama bengkel las Sumber Rejeki desa Sawahan, Jaten dan Pondok Pesantren Wirausaha Masjid Fatimah Ar Royyan desa Jongkang, Buran, Karanganyar.
IMPLEMENTASI TEACHING FACTORY DI PONDOK PESANTREN WIRAUSAHA FATIMAH AR-ROYYAN KARANGANYAR Surojo, Eko; Triyono, Teguh; Cahyono, Sukmaji Indro; Muhayat, Nurul; Triyono, Triyono
Abdi Masya Vol 1 No 4
Publisher : Pusat Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52561/abma.v1i4.185

Abstract

Pondok Pesantren Wirausaha Fatimah Ar-Royyan mengajarkan teori dan praktek kepada santri-santrinya agar mampu mandiri berwirausaha. Selama proses belajar mengajar, hasil praktek santri baik kain maupun kertas tidak termanfaatkan dengan baik dan lebih banyak yang menjadi sampah, padahal biaya BHP (Bahan Habis Pakai) praktek desain grafis dan sablon cukup tinggi. Oleh karena itu, penerapan konsep teaching factory pada pondok pesantren ini sangat penting. Implementasi teaching factory adalah dengan menjadikan materi pelajaran praktek santri sebagai pengerjaan pesanan dari pelanggan atau produk yang bisa dijual. Langkah-langkah penerapan konsep teaching factory adalah sebagai berikut: (1) memberi pelatihan dan pendampingan konsep teaching factory, (2) merancang bangun alat-alat sablon kaos, (3) memberi bantuan fasilitas desain grafis, (4) menguruskan Surat Izin Usaha Perdagangan (SIUP), (5) merancangkan logo, iklan, materi promosi dan papan nama. Hasil implementasi teaching factory, Kegiatan Belajar Mengajar di Pondok Pesantren Wirausaha Fatimah Ar-Royyan bisa menghemat BHP bahkan bisa menghasilkan keuntungan finansial. Dengan keuntungan finansial ini, Pondok Pesantren Wirausaha Masjid Fatimah Ar Royyan bisa tetap gratis dan bisa meningkatkan kapasitas santrinya sehingga semakin banyak pemuda-pemuda putus sekolah dan dari keluarga tidak mampu bisa menimba ilmu keterampilan dan kewirausahaan.
PENINGKATAN PRODUKTIVITAS IHRISH CREATIVE STUDIO DENGAN DIVERSIFIKASI PRODUK Triyono; Surojo, Eko; Muhayat, Nurul; Triyono, Teguh; Cahyono, Sukmaji Indro; Margono, Bambang
Abdi Masya Vol 5 No 2
Publisher : Pusat Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52561/abdimasya.v5i2.381

Abstract

Ihrish creative studio merupakan usaha rintisan yang terletak di dusun Jongkang, Tasikmadu, Karanganyar. Usaha rintisan ini didirikan seorang pemuda yang merupakan mantan anak jalanan. Pemuda ini masuk di Pondok Pesantren Wirausaha yang dikelola oleh Yayasan Usaha Umat Karanganyar dan mendirikan Ihrish creative studio dengan modal seadanya. Saat ini, usaha rintisan ini telah berumur kurang lebih 1 tahun dan mendapat Nomor Izin Berusaha (NIB) tanggal 22 Juli 2022. Lingkup kegiatan ekonomi Ihrish creative studio adalah jasa desain dan cetak MMT, layout buku dan kalender, dan sablon kaos. Sebagaimana lazimnya usaha rintisan, pelaku usaha ini masih mencari format usaha yang sesuai bagi unit usahanya. Pelaku usaha dalam level ini akan melakukan trial dan error sambil mengevaluasi besarnya modal dan keuntungan untuk memperlancar pengembangan usaha. Tim PKM UNS melihat usaha rintisan Ihrish creative studio ini perlu diarahkan untuk meningkatkan produktivitasnya dengan cara diversifikasi produk yaitu memperbanyak jenis usaha sehingga bidang usaha menjadi lebih luas dan kemungkinan mendapat konsumen akan lebih besar. Langkah-langkah tim PKM UNS adalah sebagai berikut: (1) memberi pelatihan dan pendampingan konsep desain dan percetakan, (2) merancang bangun alat-alat cetak selain alat sablon kaos (sablon lengan kaos, sablon mug dan gelas, sablon payung), (3) memberi bantuan fasilitas desain grafis, (5) merancangkan iklan, materi dan media promosi. Hasil pelaksanaan PKM ini mampu meningkatkan sustainability (keberlangsungan) Ihrish creative studio dengan tambahan keuntungan finansial. Hal ini ditunjukkan oleh rata-rata nilai omset pada 2 bulan setelah selesainya program ini yang meningkat 25% dari 2 bulan sebelumnya. Dengan stabilnya usaha ini, keuntungan sosial yang diperoleh adalah pemilik Ihrish creative studio yang awalnya anak jalanan akan istiqomah/tetap pendiriannya untuk tetap melakukan usaha ekonomi yang layak. Selain itu, jika Ihrish creative studio menjadi perusahaan besar, pemiliknya dapat menjadi teladan bagi anak-anak jalanan yang lain atau dapat memberi lowongan pekerjaan bagi teman-teman anak jalanan.
Corrosion Performance of a Novel Aluminium 6061-Sea Sand Composite Under Electrochemical Method Surojo, Eko; Triyono, Teguh; Akbar, Hammar Ilham; Pramudi, Ganjar; Triyono; Raharjo, Wijang W.; Agiel, Raiddin Muhamad; Majid, Faishal M.; Seputro, Harjo; Habibi, Ilham
Emerging Science Journal Vol. 9 No. 5 (2025): October
Publisher : Ital Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/ESJ-2025-09-05-012

Abstract

The need for lightweight materials is increasing from year to year. In its application, lightweight and strong materials also need to be corrosion resistant. Corrosion resistance is an important property in automotive, especially in high humidity areas. Al6061-Sea sand material is a novel material that meets the mechanical standards required in the automotive sector. A previous study of Al 6061-sea sand conducted the mechanical properties of the composite. This current research focuses on the development of Al 6061 material with variations in weight fraction of sea sand reinforcement against the corrosion rate under the potentiodynamic method to determine the corrosion resistance of the composite material. The composite fabrication uses the electroless coating method on sea sand and the stir casting method with a melting temperature of 750°C. The agitation process used a four-bladed impeller for 10 minutes at 600 rpm with a stirring depth of ½ of the height of the molten metal. The tests include density testing, microstructure observation, and corrosion rate under the potentiodynamic method using an electrochemical potentiostat. The test result obtained the lowest corrosion rate results in 2% wt sea sand with a corrosion rate of 0.61875 mmpy. The increase in corrosion rate value is directly proportional to the addition of the weight fraction of sea sand.
Enhancing AA6061–Bottom Ash Composites: Role of Heat Treatment on Properties and Dimensional Stability Seputro, Harjo; Bintoro, Sefrian R.; Ariawan, Dody; Surojo, Eko; Triyono
Civil Engineering Journal Vol. 11 No. 11 (2025): November
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-11-023

Abstract

Aluminum matrix composites (AMCs) reinforced with industrial by-products have attracted attention as lightweight, sustainable materials, yet most research has focused on fly ash. The higher density of bottom ash compared to fly ash makes bottom ash suitable for use as reinforcement in AMC. This study investigates the combined effect of BA reinforcement (0, 3, and 6 wt%) and T6 heat treatment (aging at 175, 200, and 225 °C) on the microstructure, mechanical performance, thermal expansion, and dimensional stability of AA6061 composites. Mechanical testing, thermomechanical analysis (TMA), and coordinate measuring machine (CMM) evaluations were conducted to establish correlations between microstructure and macroscopic reliability. The results show that aging plays a decisive role in strengthening and stabilizing the alloy. The unreinforced AA6061 achieved peak hardness (69.43 BHN) and tensile strength (274.60 MPa) at 200 °C, but exhibited the largest distortion due to high thermal expansion. BA addition significantly reduced the mean coefficient of thermal expansion, with the 3 wt% BA composite aged at 200 °C demonstrating the most balanced behavior: stable CTE response, minimal distortion (0.1–0.4 mm²), and improved mechanical reliability. In contrast, 6 wt% BA composites, despite their lowest mean CTE (≈25 ppm/K), suffered from local instabilities due to particle agglomeration and porosity, leading to reduced toughness and higher geometric irregularities. Overall, this work highlights the novelty of employing BA as a sustainable reinforcement distinct from fly ash, showing that moderate BA addition coupled with optimized heat treatment can enhance dimensional stability and mechanical performance. The findings provide new insights into the design of cost-effective, environmentally friendly AMCs for structural applications.
Effect of Cu and SiO₂ on a Remelted-Recycled Piston Alloy Under Vertical Centrifugal Casting Conditions Triyono, Teguh; Surojo, Eko; Prabowo, Aditya Rio; Triyono, Triyono; Djordjevic, Branislav; Carvalho, Hermes; Adie, Prayoga Wira; Sholehuddin, Muhammad Ilham
Civil Engineering Journal Vol. 12 No. 1 (2026): January
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-01-020

Abstract

Functionally graded aluminum matrices produced by means of centrifugal casting offer a route to location-specific properties, yet sustainable feedstocks and dual-density reinforcements are less well explored. In this work, we evaluate vertical centrifugal casting (VCC) of a remelted, recycled piston alloy reinforced with silica (SiO₂) and copper (Cu) particulates selected for their contrasting densities relative to the matrix. Castings were produced at 1000 rpm for 5 minutes using a 500 °C preheated mold and an 800 °C pour temperature. Cu was added at 1–4 wt.% and SiO₂ was added at 0–9 wt.%. Bulk density/porosity measurements, Vickers hardness testing, and optical/SEM microstructural analysis were employed to characterize the resulting gradients. The density increased with the radial distance from the rotation axis, accompanied by a monotonic decrease in porosity, consistent with centrifugal separation. Microstructurally, SiO₂ concentrated toward the inner region near the rotation center; in comparison, Cu was enriched at the outer periphery. Correspondingly, hardness exhibited a spatial gradient: SiO₂-reinforced zones were hardest near the inner region, whereas Cu-rich outer zones were hardest at the external rim. These results demonstrate that VCC of a recycled Al–Si feedstock can be used to reliably tailor its microstructure and properties through density-driven particle segregation, enabling controllable, bidirectional functional grading using environmentally friendly starting materials.
PELATIHAN PROSES GAS METAL ARC WELDING (GMAW) UNTUK TUKANG LAS SOLO RAYA Triyono; Nurul Muhayat; Eko Surojo
Abdi Masya Vol 7 No 1
Publisher : Pusat Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52561/abdimasya.v7i1.382

Abstract

There are numerous welding workshops in Solo, but they mostly offer similar products such as household items like fences, canopies, and window grilles. These products are customized, leading to inconsistent production levels—sometimes with high demand, other times quiet periods. To sustain these workshops, it's crucial to innovate both products and marketing strategies. Products like office, campus, and school furniture are consistently in demand. To compete effectively, workshop products need to improve in quality through advanced welding technology, particularly Gas Metal Arc Welding (GMAW). Therefore, workshops require training in using sophisticated equipment like GMAW machines. In the Community Partnership Program (PKM), the PKM UNS team collaborates with two partners: Sumber Rejeki Welding Workshop in Dusun Sawahan and the Takmir of Fatimah Ar-Royyan Mosque. The program unfolds in two phases. Phase I involves training workshop owners and workers in GMAW machine operations, with the PKM UNS team providing expertise. Phase II includes a joint project to create desk and chair furniture as demonstration products from the training, which will be donated to the TPA of Fatimah Ar-Royyan Mosque in Jongkang. This PKM initiative aims to equip owners and workers from Sumber Rejeki Welding Workshop and nearby workshops with skills in designing structures and manufacturing office furniture using GMAW, as well as effectively marketing these products.
PENINGKATAN EFISIENSI TATA LETAK RUANG PRODUKSI PADA IHRISH CREATIVE STUDIO MELALUI PENDEKATAN ERGONOMI DAN LEAN MANUFACTURING Triyono Triyono; Rizki Dwi Ardika Rizki; Eko Surojo; Nurul Muhayat; Teguh Triyono; Sukmaji Indro Cahyono
ADIMAS Jurnal Pengabdian Kepada Masyarakat Vol 10 No 1 (2026): Maret 2026
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/adimas.v10i1.12675

Abstract

This study aims to improve the efficiency of production space at Ihrish Creative Studio through an ergonomics and lean manufacturing approach. The study was conducted using direct observation, interviews, workflow analysis, and redesign of the production layout. The implementation results showed a reduction in production material movement time from an average of 14 minutes to 5–6 minutes. This increase in efficiency resulted in an increase in daily production output of up to ±30%, as well as a reduction in operational costs through time and energy savings. The application of ergonomic principles also increased comfort and safety at work, as demonstrated by positive feedback from workers. In addition, the new layout also strengthened the studio's social function as a training and community empowerment center. This study confirms that the integration of ergonomics and lean manufacturing is effective in addressing space limitations in micro-enterprises, while strengthening operational and social sustainability.
Magnesium Addition and Treatment of Reinforcement Particles in Al6061 – Sea Sand Composite on Coefficients Friction and Wear Rate Hammar Ilham Akbar; Muhammad Ilham Arbi Atmaja; Eko Surojo; Bambang Kusharjananta; Reza Aldiansyah Fanani
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.
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