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PENGARUH FRAKSI VOLUME HYBRID COMPOSITE BULU ITIK DAN SERAT PURUN TIKUS BERMATRIK POLYSTER TERHADAP KEKUATAN TEKAN DAN BENTUK PATAHAN Syarief, Akhmad; Fauzi, Dimas Habib
JTAM ROTARY Vol 5, No 2 (2023): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v5i2.9766

Material komposit umumnya dipahami sebagai sebuah material gabungan antara sebuah matrik dan satu atau beberapa penguat (reinforced), dengan sifat berbeda satu dengan yang lain. Tujuan dari penelitian ini adalah untuk mengetahui nilai kekuatan tekan serta menganalisis bentuk patahan dari hybrid composite bulu itik (Anas Plathycus Borneo) – serat purun tikus (Eleocharis Dulcis) bermatriks polyester terhadap uji tekan. Pengujian tekan yang dilakukan menggunakan standar ASTM D1621-00 . Hasil penelitian diperoleh kuat tekan tertinggi dimiliki oleh spesimen dengan fraksi volume 10% bulu itik – 90% serat purun tikus, yaitu 130,98 MPa dan nilai kuat tekan terendah dimiliki oleh spesimen dengan fraksi volume 90% bulu itik – 10% serat purun tikus, yaitu 86,29 Mpa. Nilai tersebut terlihat bahwa semakin tinggi komposisi purun tikus maka semakin tinggi kuat tekannya dan jika semakin tinggi komposisi serat bulu itik makan nilai kuat tekannya akan menurun. Spesimen uji tekan dengan nilai tertinggi dan terendah mengalami jenis patahan Fibre Pull Out.Composite materials are generally understood as composite materials between a matrix and one or several reinforced (reinforced), with different properties from one another. The purpose of this study was to determine the value of compressive strength and to analyze the fracture shape of the hybrid composite of duck down (Anas Plathycus Borneo) – water chestnuts (Eleocharis Dulcis) fiber with a polyester matrix against compression tests. Compressive testing was carried out using the ASTM D1621-00 standard. The results showed that the highest compressive strength was obtained by a specimen with a volume fraction of 10% duck hair – 90% water chesnuts fiber, namely 130.98 MPa, and the lowest compressive strength value was owned by a specimen with a volume fraction of 90% duck hair – 10% water chesnuts fiber 86.29 MPa. It can be seen that the higher the composition of the water chesnuts, the higher the compressive strength, and if the higher the composition of the duck hair fiber, the compressive strength value will decrease. The compressive test specimens with the highest and lowest values experienced a type of Fiber Pull Out fracture.

PENGARUH VARIASI ARUS PENGELASAN GMAW TERHADAP DISTORSI DAN KEKERASAN PADA BAJA ST37 POST HEATING 400˚C Zuhri Simanjuntak, Rinal Fadel; Ansyah, Pathur Razi; Ramadhan, Muhammad Nizar; Syarief, Akhmad
JTAM ROTARY Vol 6, No 2 (2024): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v6i2.12540

Penelitian ini memiliki tujuan untuk mengeksplorasi dampak variasi arus pengelasan GMAW terhadap distorsi dan kekerasan pada material baja ST37 setelah dipanaskan pada suhu 400˚C. Hasil penelitian mengenai variasi arus dan perlakuan post heating pada suhu 400°C di daerah HAZ dan pada area Weld Metal menunjukkan perbedaan yang signifikan dalam nilai kekerasan. Perbedaan ini dipengaruhi oleh variasi arus yang diberikan; semakin tinggi arusnya, semakin besar pula pelunakan logam yang terjadi. Sebagai contoh, pada arus 100 A, nilai kekerasan tercatat sebesar 65 HRB, sedangkan pada arus 120 A, nilai tersebut turun menjadi 56,4 HRB. Di bagian Weld Metal, nilai kekerasan tertinggi terlihat pada arus 80 A (59,8 HRB), dan nilai terendah terdapat pada arus 120 A (51,1 HRB). Dari ketiga perbedaan suhu yang diberikan kepada spesimen dengan arus yang berbeda, yaitu 80 A, 100 A, dan 120 A, memiliki nilai distorsi rata-rata tertinggi pada arus 80 A (1,17 mm), diikuti oleh arus 100 A (0,85 mm), dan terendah pada arus 120 A (0,68 mm). Hasil penelitian uji distorsi ini menunjukkan bahwa perlakuan post heating sangat berpengaruh terhadap nilai distorsi pada spesimen tersebut. This study seeks to investigate the impact of varying GMAW welding currents on distortion and hardness in ST37 steel material post-heating at 400˚C. The research findings on the variations in current and post-heating treatment at 400°C in both the HAZ (Heat Affected Zone) and Weld Metal areas reveal significant differences in hardness values. These differences are attributed to variations in the current supplied; the higher the current, the greater the metal melting (softening) observed. For instance, at 100 A, the hardness value is recorded at 65 HRB, while at 120 A, it decreases to 56.4 HRB. In the Weld Metal section, the highest hardness value is observed at 80 A (59.8 HRB), and the lowest is at 120 A (51.1 HRB). Among the three different current levels (80 A, 100 A, and 120 A) applied to spesimens, the average distortion value is highest at 80 A (1.17 mm), followed by 100 A (0.85 mm), and lowest at 120 A (0.68 mm). These results underscore the significant impact of post-heating treatment on the distortion of the spesimen.

The Damage Control of Liquid Waste Pumping Machines in Palm Oil Companies Tumanggor, Agustina Hotma Uli; Syarief, Akhmad; Atmana, Fendy Ari
International Journal of Education, Science, Technology, and Engineering (IJESTE) Vol 4 No 2: December 2021
Publisher : Lamintang Education and Training Centre, in collaboration with the International Association of Educators, Scientists, Technologists, and Engineers (IA-ESTE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36079/lamintang.ijeste-0402.287

X is a company that works in the field of oil palm plantations and has a palm oil production capacity of 60 tons per hour. The products of palm oil that have been produced are Crude Palm Oil (CPO) and Palm Kernel Oil (PKO). The various kinds of waste produced by the company as a result of the palm oil industry process are liquid waste, palm kernels, fiber and seed shells. Liquid waste is used as organic fertilizer for oil palm plantations which will be sent through a liquid waste pump machine. Damage that occurs to the liquid waste pump machine will inhibit the delivery of liquid waste to the plantation, thus affecting the yield of palm oil from the plantation itself. This study describes the application of repair and preventive maintenance policies for liquid waste pump machines by looking at the frequency of damage to the liquid waste pump engine and predicting the delivery of liquid waste to the pump engine for the next period as well as providing solutions for handling damage that occurs in the liquid waste pump engine. From the results of calculations on data processing, the results of how to control the causes of damage that occur in the liquid waste pump machine can be overcome by using the Preventive Maintenance Method within a period of 1 month and maintenance of every component in the liquid waste pump machine within 1 cycle, namely 357.27 hours with a repair time of 5.82 hours. Controlling other causes of damage is to add a filter to the liquid waste pool so that stones, leaves and liquid waste husks do not hinder the suction pipe of the liquid waste pump machine.

PENGARUH VARIASI PENDINGINAN DAN HOLDING TIME TERHADAP NILAI KEKERASAN DAN STRUKTUR MIKRO PADA PERLAKUAN PANAS BAJA ASSAB 88 syarief, akhmad
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3529

Along with the rapid development of science, improving material properties needs to be done to support the needs in the industrial world. This study aims to determine the effect of heat treatment with variations in cooling media and holding time on the value of hardness and microstructure in heat treatment of Assab 88 steel. The research process begins with cutting Assab 88 steel, then the heating process is carried out with a temperature of 850˚C, then the cooling process is carried out with various media such as air, water and oil with holding time variations for 30 minutes, 45 minutes and 60 minutes. The results showed that the highest hardness value was found in water cooling media with a holding time of 60 minutes at 87.1 HRB and the lowest value in air cooling media at 78.1 HRB. Microstructure testing in water cooling media will form martensite which makes the steel harder but brittle, while with oil cooling media will produce a balance between hardness and toughness because bainite structures are formed and martensite is more dominant and a little pearlite. Keywords: Cooling medium, holding time, hardness test, microstructure test, ASSAB 88 steel.

Experimental Study of Updraft Gasification of Rice Husk and Coal to Produce Syngas Nugroho, Fiqrei Akbar; Syarief, Akhmad; Mikhael, Allexyus; Supit, Geovani Glen
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 2 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.02.4

Limited resource of fossil fuel inspires many research activities to search for alternative energy. This work offers alternative solution to address this problem through charcoal gasification. The goal of this research is to find the amount of syngas produced in the gasification is process. The alternative fuel was produced from the mixing rice husk and low quality coal due to their abundant resource in South Kalimantan. The mixture was then gasified at 500 Â°C. The highest syngas volume at 29.56 L was in the sample of SP 200 gr and BB 0 then followed at 25.7 L for ratio SP 180 gr : BB 20 gr. The lowest produced syngas 19.45 was produced from the sample with ratio SP 100 gr : BB 100 gr. This gasification process also resulted in side product, i.e. tar component which varies from 22.5 mL to 58.75 mL.

Influence of Mixture Composition and Compaction Pressure of Briquette Made from Ironwood (Eusideroxylon Zwageri) Charcoal and Gelam (Melaleuca Cajuputi ) on Combustion Characteristic Syarief, Akhmad; Awaly, Nuryasin Qadimil; Yusuf, Muhammad; Iberahim, Jerry
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 2 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.02.6

In recent few years, many works have been dedicated to search for new source of renewable energy. In this study, new source of renewable energy is based in the briquette made from mixture of ironwood (Eusideroxylon zwageri) powder and gelam (Melaleuca leucadendron) wood powder. The mixture was carbonized at temperature of 500 oC Â± 10 oC for 120 minutes. The size of the particles used was 50 mesh while the ratio between wood powder adhesives, i.e. starch powder, used in the study was 1:1. The composition variations between ironwood charcoal and gelam were 100% ironwood charcoal powder and 0% gelam, 70%: 30%, 50%: 50%, 30%: 70%, 0% ironwood: 100% gelam. The compaction pressure during briquette production was varied at 100 kg/cm2, 125 kg/cm2 and 150 kg/cm2. Â The highest combustion temperature at 205 oC occurred in the specimen with composition of 30% ironwood powder and 70% gelam wood powder with compaction pressure of 100 kg/cm2. The longest burning duration 140 minutes (2 hours 20 minutes) occurred at composition of 50% ironwood powder and 50% gelam wood powder at compaction pressure of 150 kg/cm2. The fastest initial ignition time was 7 minutes and occurred for mixture with composition of 70% ironwood powder and 30% gelam wood powder at compaction pressure of 125 kg/cm2.

Effect of Compaction Pressure and Sawdust Size on Briquette Made from Ulin Wood (Eusideroxylon Zwageri) and Gelam Wood (Melaleuca Cajuputi) to Combustion Characteristics Pratama, Bagus Harits; Syarief, Akhmad; Saputra, M. Reynaldi Perdana; Azis, Alif Putra
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.4

In Kalimantan, gelam (Melaleuca cajuputi) Â grows naturally in the swamp forest reaching 40 m with a diameter around 35 cm. Gelam wood is very resistant to acid soil in the swamp forest. Despite of itâ€™s small diameter, gelam wood is very strong. This wood is usually used as the main house, as mold or mall support in casting concrete. Ulin (Eusideroxylon zwageri) is a typical plant of Kalimantan. In this study, the ignition duration, burning speed, and ash weight from briquette made from mixture of ulin and gelam sawdust was investigated. Size of sawdust used for briquette was varied for 40, 50, and 60 mesh while compaction pressure during briquette production was varied for 100, 125 and 150 kg/cm2. The study shows that the highest combustion temperature at 178 oC occurred for briquette with compaction pressure of 150 kg/cm2. Meanwhile, the lowest combustion temperature was obtained in briquette witch compaction pressure of 100 kg/cm2.

Pengaruh Fraksi Volume pada Hybrid Komposit Serat Bemban – Purun Tikus Bermatriks Polyester terhadap Kekuatan Tekan dan Impak syarief, akhmad; Anugrahto, Ripal; Tamjidillah, Mastiadi; Ma’ruf, Ma’ruf; Nugraha, Andy; Ramadhan, Muhammad Nizar; Fadliyanur, Fadliyanur
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 22, No 1 (2025): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v22i1.21626

Material komposit dipahami sebagai salah satu jenis inovasi material maju yang terbentuk berdasarkan hasil penggabungan antara matrik dan satu atau beberapa penguat (reinforced) dengan memiliki karakteristik tertentu. Riset yang dilakukan bertujuan untuk mengetahui pengaruh fraksi volume hybrid composite serat bemban (Donax caniformis) – serat purun tikus (Eleocharis dulcis) bermatriks polyester terhadap kekuatan tekan dan kekuatan impak. Pembuatan sampel uji komposit dilakukan menggunakan teknik hand lay up, yaitu proses pencampuran antara matriks dan serat kedalam jenis cetakan terbuka dilakukan dengan penuangan langsung secara manual. Pengujian tekan menggunakan standar ASTM D1621-00 dan pengujian impak menggunakan standar ASTM D6110-10. Hasil penelitian menunjukkan bahwa variasi fraksi volume 18% serat bemban dan 2% serat purun tikus berpengaruh terhadap kekuatan tekan dan kekuatan impak. Variasi fraksi volume 18% serat bemban dan 2% serat purun tikus menunjukkan kekuatan tekan tertinggi dengan rata – rata nilai kekuatan tekannya sebesar 48,286 MPa dan rata – rata beban maksimal 46.433,33 N dan pada variasi fraksi volume yang sama menunjukkan kekuatan impak tertinggi dengan rata – rata kekuatan impaknya sebesar 0,1486 Joule/mm2 dan rata – rata energi impak 19,16 Joule. Nilai yang didapatkan menyatakan bahwa dengan variasi fraksi volume penguat yang didominasi oleh muatan serat bemban akan meningkatkan nilai kekuatan tekan dan impak. Hal tersebut dipengaruhi oleh perbedaan karakteristik serat.

Experimental Study of Updraft Gasification of Rice Husk and Coal to Produce Syngas Nugroho, Fiqrei Akbar; Syarief, Akhmad; Mikhael, Allexyus; Supit, Geovani Glen
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 2 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.02.4

Limited resource of fossil fuel inspires many research activities to search for alternative energy. This work offers alternative solution to address this problem through charcoal gasification. The goal of this research is to find the amount of syngas produced in the gasification is process. The alternative fuel was produced from the mixing rice husk and low quality coal due to their abundant resource in South Kalimantan. The mixture was then gasified at 500 Â°C. The highest syngas volume at 29.56 L was in the sample of SP 200 gr and BB 0 then followed at 25.7 L for ratio SP 180 gr : BB 20 gr. The lowest produced syngas 19.45 was produced from the sample with ratio SP 100 gr : BB 100 gr. This gasification process also resulted in side product, i.e. tar component which varies from 22.5 mL to 58.75 mL.

Influence of Mixture Composition and Compaction Pressure of Briquette Made from Ironwood (Eusideroxylon Zwageri) Charcoal and Gelam (Melaleuca Cajuputi ) on Combustion Characteristic Syarief, Akhmad; Awaly, Nuryasin Qadimil; Yusuf, Muhammad; Iberahim, Jerry
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 2 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.02.6

In recent few years, many works have been dedicated to search for new source of renewable energy. In this study, new source of renewable energy is based in the briquette made from mixture of ironwood (Eusideroxylon zwageri) powder and gelam (Melaleuca leucadendron) wood powder. The mixture was carbonized at temperature of 500 oC Â± 10 oC for 120 minutes. The size of the particles used was 50 mesh while the ratio between wood powder adhesives, i.e. starch powder, used in the study was 1:1. The composition variations between ironwood charcoal and gelam were 100% ironwood charcoal powder and 0% gelam, 70%: 30%, 50%: 50%, 30%: 70%, 0% ironwood: 100% gelam. The compaction pressure during briquette production was varied at 100 kg/cm2, 125 kg/cm2 and 150 kg/cm2. Â The highest combustion temperature at 205 oC occurred in the specimen with composition of 30% ironwood powder and 70% gelam wood powder with compaction pressure of 100 kg/cm2. The longest burning duration 140 minutes (2 hours 20 minutes) occurred at composition of 50% ironwood powder and 50% gelam wood powder at compaction pressure of 150 kg/cm2. The fastest initial ignition time was 7 minutes and occurred for mixture with composition of 70% ironwood powder and 30% gelam wood powder at compaction pressure of 125 kg/cm2.

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