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All Journal Jurnal Rekayasa Mesin Jurnal Abdi Insani International Journal of Mechanical Engineering Technologies and Applications (MECHTA) International Journal of Industrial Innovation and Mechanical Engineering
Robittah, Ahmad
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Effect of Alkalization Duration and the Orientation of Fiber on Composites of Polyester Reinforced Fibre of Terap Tree (Artocarpus Elasticus) on Impact and Bending Strength Syarif, Akhmad; Sumantri, Dhenny; Robittah, Ahmad; Prayogi, Syafa'at
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.2

Abstract

Composite application has increased in recent years due to many advantages, e.g. In Kalimantan, there are many types of flora, one of which is the Terap tree (Artocarpus elasticus) which has a strong enough strength and is usually used by the Dayak people as clothing, hats, and rigging. In this research, we examine the laminate composite of tree skin fibers against bending strength and impact price. In making composites using a variety of alkali time, namely 60 minutes, 90 minutes and 120 minutes, the amount of alkali concentration used is 15% of the total volume of alkaline liquid. Then also use variations of fiber orientation 0o-900-00-900, 00-900-900-00, and 900-00-00-900. The impact test results showed that the highest value was obtained in specimens with an immersion time of 90 minutes with 00-900-00-900 orientation of 0.00294 joule / mm2 and the lowest value was found in specimens with immersion time 120 minutes 00-900-00-900 amounting to 0.00164 joules / mm2. While the Bending test obtained the highest value in specimens with 120 minutes of immersion time with 00-900-00-900 fiber orientation of 48.01 mph and the lowest value was obtained in specimens with 60 minutes immersion time at 900-00-00-900 for 16.62 MPa.
ECO – INNOVATIVE CARBURIZING: ENHANCING STEEL ST 37 WITH ALABAN CHARCOAL AND EGGSHELL CATALYSTS Ahmad Robittah; Suprapto, Wahyono; Widodo, Teguh Dwi; Wirawan , Willy Artha; Sabitah, A’yan
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.13

Abstract

This study examines the enhancement of St 37 steel through an eco-friendly carburization process using Alaban charcoal and eggshell catalyst. The agriculture sector in South Kalimantan, Indonesia, depends largely on metal tools made from low-carbon steel, which need greater hardness and durability. Traditional carburization techniques are costly and often lead to uneven carbon distribution. This research investigates the use of Alaban wood charcoal and local duck eggshell waste as carburizing agents. The experiment involved varying the weight ratio of charcoal to eggshell powder, then carburizing at 950°C for two hours, followed by water quenching. The results indicated a notable increase in surface carbon content, diffusion depth, hardness, and microstructure of St 37 steel. The optimal combination, achieving the highest surface hardness of 947 HV and a carbon diffusion depth of 1.0 mm, was found at an eggshell catalyst concentration of 30%. All samples exhibited a microstructural change to martensite. These results demonstrate the potential of using agricultural waste to enhance steel properties, promoting more sustainable and cost-effective industrial practices.
Analisis Kandungan Karbon dan Kekerasan Baja AISI 1020 dengan Variasi Media Karburasi Batubara Lignit dan Cangkang Telur Adawiyah, Rabiatul; Rahman, Noor; Sabitah, A'yan; Ardiyat, Ichwan Noor; Robittah, Ahmad
Jurnal Rekayasa Mesin Vol. 19 No. 3 (2024): Volume 19, Nomor 3, Desember 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i3.5937

Abstract

Karburisasi adalah proses perlakuan panas yang meningkatkan kekerasan dan ketahanan aus baja karbon rendah, seperti AISI 1020, yang sering digunakan dalam industri. Penelitian ini bertujuan untuk mengevaluasi pengaruh fraksi berat batubara lignit dan cangkang telur sebagai media karburasi terhadap kandungan karbon, kekerasan, dan struktur mikro baja AISI 1020. Karburasi dilakukan dengan lima variasi fraksi berat (60-100% batubara lignit dan 0-40% cangkang telur) selama dua jam, diikuti pendinginan udara. Kandungan karbon diukur menggunakan optical emission spectrometer (OES), kekerasan diuji dengan microvickers, dan struktur mikro dianalisis menggunakan scanning electron microscope (SEM). Hasil menunjukkan bahwa penambahan cangkang telur sebagai katalis meningkatkan kandungan karbon hingga 0,955%, dengan kekerasan tertinggi sebesar 3937 HV pada variasi 30% cangkang telur. Struktur mikro baja berubah dari dominasi ferit-perlit menjadi lebih banyak perlit-sementit. Kombinasi batubara lignit dan cangkang telur terbukti efektif dan ramah lingkungan
ECO – INNOVATIVE CARBURIZING: ENHANCING STEEL ST 37 WITH ALABAN CHARCOAL AND EGGSHELL CATALYSTS Ahmad Robittah; Suprapto, Wahyono; Widodo, Teguh Dwi; Wirawan , Willy Artha; Sabitah, A’yan
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.13

Abstract

This study examines the enhancement of St 37 steel through an eco-friendly carburization process using Alaban charcoal and eggshell catalyst. The agriculture sector in South Kalimantan, Indonesia, depends largely on metal tools made from low-carbon steel, which need greater hardness and durability. Traditional carburization techniques are costly and often lead to uneven carbon distribution. This research investigates the use of Alaban wood charcoal and local duck eggshell waste as carburizing agents. The experiment involved varying the weight ratio of charcoal to eggshell powder, then carburizing at 950°C for two hours, followed by water quenching. The results indicated a notable increase in surface carbon content, diffusion depth, hardness, and microstructure of St 37 steel. The optimal combination, achieving the highest surface hardness of 947 HV and a carbon diffusion depth of 1.0 mm, was found at an eggshell catalyst concentration of 30%. All samples exhibited a microstructural change to martensite. These results demonstrate the potential of using agricultural waste to enhance steel properties, promoting more sustainable and cost-effective industrial practices.
Effect of Alkalization Duration and the Orientation of Fiber on Composites of Polyester Reinforced Fibre of Terap Tree (Artocarpus Elasticus) on Impact and Bending Strength Syarif, Akhmad; Sumantri, Dhenny; Robittah, Ahmad; Prayogi, Syafa'at
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.2

Abstract

Composite application has increased in recent years due to many advantages, e.g. In Kalimantan, there are many types of flora, one of which is the Terap tree (Artocarpus elasticus) which has a strong enough strength and is usually used by the Dayak people as clothing, hats, and rigging. In this research, we examine the laminate composite of tree skin fibers against bending strength and impact price. In making composites using a variety of alkali time, namely 60 minutes, 90 minutes and 120 minutes, the amount of alkali concentration used is 15% of the total volume of alkaline liquid. Then also use variations of fiber orientation 0o-900-00-900, 00-900-900-00, and 900-00-00-900. The impact test results showed that the highest value was obtained in specimens with an immersion time of 90 minutes with 00-900-00-900 orientation of 0.00294 joule / mm2 and the lowest value was found in specimens with immersion time 120 minutes 00-900-00-900 amounting to 0.00164 joules / mm2. While the Bending test obtained the highest value in specimens with 120 minutes of immersion time with 00-900-00-900 fiber orientation of 48.01 mph and the lowest value was obtained in specimens with 60 minutes immersion time at 900-00-00-900 for 16.62 MPa.
SOSIALISASI SANITASI DAN HIGIENITAS DI LINGKUNGAN KERJA UD. SU’AIDI SALMAH Zaini, Muhammad; Salman, Yuliana; Hariyono, Muhammad Akbar; Tahdi, Muhammad; Robittah, Ahmad; Isna, Isna; Hazizah, Hazizah; Widyawati, Tri Aksari; Priyadi, Budi
Jurnal Abdi Insani Vol 12 No 10 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i10.2991

Abstract

Sanitasi dan higienitas merupakan faktor penting dalam menjamin mutu produk kesehatan dan kosmetika tradisional. Namun, masih banyak pelaku industri kecil yang menghadapi keterbatasan fasilitas dan kurangnya pemahaman tenaga kerja dalam penerapan prinsip sanitasi yang baik. Kondisi ini dapat meningkatkan risiko kontaminasi silang dan menurunkan kualitas produk. Oleh karena itu, diperlukan intervensi berupa sosialisasi dan edukasi yang tepat untuk memperkuat pemahaman pekerja terkait praktik sanitasi dan higienitas di lingkungan kerja. Tujuan kegiatan ini adalah meningkatkan pengetahuan dan pemahaman pekerja UD. Su’aidi Salmah tentang prinsip sanitasi dan higienitas dalam mendukung mutu dan keamanan produk bedak dingin Bunga Tanjung. Metode kegiatan dilakukan melalui ceramah interaktif yang dilengkapi dengan media presentasi power point dan brosur bergambar. Evaluasi pemahaman peserta dilakukan menggunakan instrumen pretest dan posttest, dengan indikator capaian skor >80 sebagai standar pemahaman baik. Hasil kegiatan menunjukkan adanya peningkatan pemahaman peserta, dengan nilai rata-rata pretest sebesar 93,64 dan meningkat menjadi 97,27 pada posttest. Sebelum sosialisasi, sebanyak 91% peserta memperoleh nilai di atas 80, sedangkan setelah kegiatan, seluruh peserta (100%) mencapai skor >80. Selain itu, peserta memberikan respon positif terhadap materi dan metode penyampaian, serta menunjukkan minat dalam menerapkan prinsip sanitasi di lingkungan kerja. Dukungan dari pengelola UD. Su’aidi Salmah turut menjadi indikator penting dalam menjamin keberlanjutan program. Kesimpulan kegiatan ini adalah sosialisasi sanitasi dan higienitas terbukti efektif dalam meningkatkan pemahaman peserta serta mendorong penerapan prinsip kebersihan di lingkungan kerja secara konsisten.
Biomass-Derived Surface Engineering of AISI 1020 Steel for Electromedical Applications Robittah, Ahmad; Akbar Hariyono, Muhammad; Sabitah, A'yan; Achmadi Achmadi; Kusuma Wardani, Ika
International Journal of Industrial Innovation and Mechanical Engineering Vol. 3 No. 1 (2026): February: International Journal of Industrial Innovation and Mechanical Enginee
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/ijiime.v3i1.387

Abstract

This study investigates biomass-derived surface engineering of AISI 1020 steel for electromedical applications using galam wood charcoal and chicken bone waste as carburizing media. Surface modification is required to improve the mechanical performance of low-carbon steel, particularly in applications that demand high wear resistance and long-term durability. A pack carburizing approach was applied using various ratios of biomass-derived media at a treatment temperature of 800 °C for 2 hours. Chemical composition was analyzed using Optical Emission Spectroscopy (OES), surface hardness was evaluated using Micro Vickers hardness testing, and microstructural characteristics were observed using optical microscopy. The results show a significant increase in surface carbon content with increasing fractions of chicken bone powder, indicating its effectiveness as a carbon donor and diffusion promoter. The surface hardness increased from approximately 150 HV in the untreated condition to a maximum of about 860 HV in the treated specimen. Microstructural observations revealed the formation of a distinct carburized layer with increasing thickness and uniformity, consistent with enhanced carbon diffusion and surface strengthening. These findings demonstrate that biomass-derived surface engineering provides an effective and sustainable approach for improving the surface properties of low-carbon steel. The proposed method offers strong potential for environmentally friendly manufacturing of durable and reliable electromedical components.
Co-Authors achmadi achmadi Akbar Hariyono, Muhammad Akhmad Syarif Ardiyat, Ichwan Noor Hariyono, Muhammad Akbar Hazizah, Hazizah Isna Isna KUSUMA WARDANI, IKA Muhammad Zaini Noor Rahman, Noor Prayogi, Syafa'at Priyadi, Budi Rabiatul Adawiyah Sabitah, A'yan Sumantri, Dhenny Tahdi, Muhammad Teguh Dwi Widodo Wahyono Suprapto Widyawati, Tri Aksari Wirawan , Willy Artha Yuliana Salman