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All Journal Jurnal Teknik Mesin WARTA Media Mesin: Majalah Teknik Mesin Jurnal Rekayasa Mesin AKSIOLOGIYA : Jurnal Pengabdian Kepada Masyarakat Jurnal Elemen Journal of Welding Technology Civitas Ministerium: Jurnal Pengabdian Kepada Masyarakat Journal of Mechanical Engineering Warta LPM AutoMech : Jurnal Teknik Mesin Jurnal Foundry Jurnal Ilmiah Nusantara Journal of Industrial and Mechanical Engineering
Sri Hastuti
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Tidar
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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PENGARUH PENGELASAN LOGAM BERBEDA PLAT SS 400 DENGAN PLAT SUS 304 TERHADAP SIFAT MEKANIS Hamdan Faozi; Sri Hastuti
ELEMEN : JURNAL TEKNIK MESIN Vol. 12 No. 2 (2025)
Publisher : POLITALA PRESS

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Abstract

Metal welding technology used today can connect two different types of metals. The welding is still often found with welding defects, the problems that are often faced are differences in melting points, expansion coefficients, physical, and mechanical properties. The purpose of the research was to determine the effect of strong current variation between low carbon steel SS 400 and SUS 304 stainless steel on mechanical properties. This research method uses experimental, GTAW welding strong variations of currents 60 A, 80 A, and 100 A. The results of this study concluded that the strength of the current affects the tensile strength, and violence. The highest tensile strength is 346.63 MPa with a strain of 9.52 % and the modulus of elasticity is 36.59 MPa at a current strength of 100 A. This is due to the strong difference in currents resulting in different inputs and heat distributions in each specimen. The hardness test results show that specimens with strong current variations of 100 A have the highest hardness level of both the weld region, HAZ, and parent metal, rather than with strong current specimens of 60 A and 80 A, this is because the greater the welding ampere will increase the strength of the hardness.
ANALISIS KEKUATAN MEKANIK SERAT KELAPA BERMATRIK UNSATURATED POLYESTER DENGAN VARIASI LAMANYA WAKTU PERLAKUAN ALKALI NaOH DAN KOH Muhammad Fauzan Nurhidayat; Sri Hastuti; Faiz Listyanda
ELEMEN : JURNAL TEKNIK MESIN Vol. 13 No. 1 (2026)
Publisher : POLITALA PRESS

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Abstract

Composite materials have received attention from automotive industry players. An interesting raw material to be developed is coconut fiber waste which is abundant in Indonesia as a tropical country. The study aims to analyze the mechanical strength of coconut fiber-unsaturated polyester BQTN-EX 157 composite with volume fraction of 30%: 70%, fabricated using hand lay-up method of random fiber orientation with 15mm fiber length. This study has three variations of alkalization treatment length; 4 hours, 6 hours, and 8 hours treatment. Alkalization uses 5% NaOH and 5% KOH solutions. The tests used ASTM D6110 charpy impact test and ASTM D638 tensile test. The 6-hour KOH immersion treatment had the highest absorption energy of 4.9085 Joules and the 4-hour KOH immersion treatment had the highest impact price of 0.052 J/mm2. The 6-hour KOH immersion treatment received a tensile stress value of 13.60 MPa with the highest elastic modulus of 852.79 MPa. Observation of specimen fracture shows the presence of fiber pullout, voids, brittle fracture, rich matrix and others.
TINJAUAN LITERATUR: PENYEMPURNAAN PROSES PENEMPAAN LOGAM DENGAN ANALISIS TEGANGAN DAN TEMPERATUR Ibnu Rosyid Ridwana; Fakhrurriza; Boy Arya Sadewa; Ratna Aulia Puspita Sari; Zalfa Arridwan; Sri Hastuti
JURNAL ILMIAH NUSANTARA Vol. 3 No. 1 (2026): Jurnal Ilmiah Nusantara Januari 2026
Publisher : CV. KAMPUS AKADEMIK PUBLISING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61722/jinu.v3i1.7591

Abstract

Variations in billet temperature often lead to uneven stress and heat distribution on the dies during closed-die hot forging. This review aims to identify the die regions that are most vulnerable to excessive loading and to examine how thermal conditions influence the quality of the forged product. The literature analyzed includes studies that combine finite element simulations with actual forging trials carried out at different heating temperatures. The findings consistently show that the die edges experience the highest stress concentrations, particularly when forging is performed at lower billet temperatures, which increases the likelihood of local plastic deformation. In contrast, temperatures within the optimal range promote smoother metal flow, more complete die filling, and a longer die service life. Overall, this review highlights the crucial role of proper billet temperature control in maintaining dimensional accuracy and ensuring stable forging performance.
Analisis Pengaruh Variasi Campuran Perekat Lateks-Epxoy pada Single Lap Joint Komposit Serat Sabut Kelapa Alfiansyah Lanamas Dwiputra; Sri Hastuti; R. Faiz Listyanda
Journal of Industrial and Mechanical Engineering Vol 2 No 2 (2024): Journal of Industrial and Mechanical Engineering
Publisher : Department of Industrial Engineering, Universitas Jenderal Soedirman.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jimien.2024.2.2.13541

Abstract

Komposit banyak digunakan pada berbagai bidang seperti industri peralatan rumah tangga maupun otomotif. Komposit dapat dibuat menggunakan material penguat coco fiber. Coco fiber ini dimanfaatkan untuk tipe sambungan single lap joint yang dianggap ramah lingkungan. Tujuan dari penelitian ini yaitu menganalisis pengaruh variasi campuran perekat lateks dan epoxy yang optimal dari sambungan single lap joint komposit serat sabut kelapa terhadap kekuatan tarik geser dan menganalisis penampang dari patahan sambungan single lap joint komposit serat sabut kelapa setelah dilakukan pengujian tarik geser. Komposisi komposit coco fiber menggunakan 30% serat dan 70% resin. Matriks yang digunakan tipe resin unsaturated polyester 157 BTQN-EX dan hardener MEKPO. Cetak komposit dilakukan dengan cetak tekan. Variasi campuran perekat lateks dan epoxy dengan perbandingan variasi campuran perekat yaitu 10% (LA) : 90% (EP), 20% (LA) : 80% (EP), 30% (LA) : 70% (EP). Hasil pengujian diperoleh nilai rata-rata kekuatan tarik geser tertinggi terdapat pada spesimen dengan variasi campuran perekat 10% LA: 90% EP yaitu sebesar 1,452 MPa. Hal ini dipengaruhi oleh jumlah penambahan lateks yang optimal pada campuran perekat maka dapat meningkatkan kekuatan tarik geser. Sebaliknya nilai rata-rata terendah terdapat pada spesimen dengan variasi campuran perekat 30% LA: 70% EP sebesar 1,098 MPa. Hasil penampang patahan yang didapatkan yaitu thin layer cohesive failure, cohesive failure, dan stock break failure.
The Effect of Clay Tile Particle Addition on the Flame Retardancy and Impact Toughness of Ramie Fiber-Reinforced Polypropylene Composites Muhammad Gibrail; Sri Hastuti; R. Faiz Listyanda; Eko Saputra; Wahyu Nugroho; Farika Tono Putri; Ragil Tri Indrawati; Xander Salahudin
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7458

Abstract

Environmental concerns regarding polypropylene (PP) plastic waste have driven the demand for more sustainable alternative materials through composite development. This study aims to analyze the effect of adding Sokka roof tile particles as a filler on the flame retardancy and impact toughness of ramie fiber-reinforced composites. The composite materials utilize a polypropylene matrix, ramie fiber reinforcement, and Sokka roof tile particles as filler with concentration variations of 2%, 4%, and 6%. The results demonstrate that increasing the filler volume significantly improves the material's flame-retardant properties, with the 6% variation achieving the best thermal performance and the lowest burn rate of 214.27 mm/min. However, in terms of mechanical properties, a decline in impact toughness was observed as the filler content increased; the average energy absorption dropped from 1.075 Joules at 2% concentration to 0.735 Joules at 6%, which is consistent with the decrease in impact strength from 0.0364 J/mm² to 0.0204 J/mm². This phenomenon indicates that while inorganic particles effectively serve as a thermal barrier, excessively high concentrations increase material brittleness, thereby reducing the impact energy absorption capacity. In conclusion, a 6% concentration of Sokka roof tile particles is recommended for applications prioritizing fire safety, while considering the compromise in mechanical strength.
Co-Authors Adityo Noor Setyo Hadi Darmo Agung Purnomo Alfiansyah Lanamas Dwiputra Anaya Putri Riskia Angga Wildan Setyawan Azam Akmal Nur Irsan Boy Arya Sadewa Bramono Pandupradityo Catur Pramono Crodita Bangkit Wiranegara Danang Istanto Eko Pujiyulianto Eko Saputra Endang Mawarsih Faiz Listyanda Fajar Paundra Fajar Paundra Fakhrurriza Farika Tono Putri Hamdan Faozi Herru Santosa Budiono ibnu rosyid al hassany al hassany Ibnu Rosyid Ridwana Isro Nurul Hadi Kafi Yusuf Kafi Kun Suharno Larasanto Larasanto Martha Arum Nugraheni Maulana Aziz Hidayanto Muhamad Fatikul Arif Muhammad Fauzan Nurhidayat Muhammad Gibrail Muhammad Munadi Muktivani Swastiko Nani dkk. Mulyaningsih Nur Kholis Nurdin, Akhmad Nurhadi Nurhadi Nurhadi R. Faiz Listyanda R. Faiz Listyanda R.Faiz Listyanda Ragil Tri Indrawati Rany Puspita Dewi Ratna Aulia Puspita Sari Ridwan Afandi Ridwan Afandi Roy Aries Permana Tarigan Setya Drana Harry Putra Tardho Hakim Wahyu Nugroho Wahyuchandra Ramadhani Wandi Arnandi Xander Salahudin Xander Salahudin Yafi Akhmad Yoggo Bagus Pamungkas Yuni Nur Diana Zalfa Arridwan