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PENGARUH TEMPERATUR TEMPERING TERHADAP ENERGI IMPAK DAN POLA PATAHAN PADA BAJA AISI 1045 Supriadi, Harnowo; Primartin, Abbit; Zulhanif, Zulhanif; Suudi, Ahmad
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 1 (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.v13i1.1961

The study of the effect of low temperature quenching cooling media on the value of toughness and types of fractures in AISI 1045 steel aims to determine the mechanical properties of increasing the value of toughness and ductility in steel. AISI 1045 steel is heated at a temperature of 850°C held for 60 minutes and then quenched quickly to a low temperature. The medium used is water. This tempering process can increase the impact energy. The impac energy value obtained at a temperature of 350°C is 18,33 Joule. Then at a temperature of 450°C it increases by 80 Joule, after that it increases again at a temperature of 550°C which is 121,33 Joule, the value increases higher at a tempering temperature of 650°C by 135,67 Joule. Observation of the type of fault shows that the higher the temperature the more ductile it can be seen from the results of the uneven and fibrous surface. Impact energy is influenced by variations in tempering temperature. When the tempering temperature is increased, the impact energi also increase. Keywords: AISI 1045 Steel, Quenching, Tempering, Impact Energy, Types of Fractures

APPLICATION OF FAILURE MODE AND EFFECT ANALYSIS (FMEA) AND ISHIKAWA DIAGRAM IN DETERMINING THE DAMAGE ASPECTS AND MAINTENANCE PLAN OF SCREW FEEDER OF STEAM POWER PLANT COMPANY Riszal, Ahmad; Yohanes, Eko; Risano, A Yudi Eka; Ibrahim, Fauzi; Supriadi, Harnowo; Zulhanif
Journal of Applied Science, Engineering and Technology Vol. 2 No. 2 (2022): December 2022
Publisher : INSTEP Network

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Screw feeder is a type of material transporter that is widely used in various industrial sectors, where its function is very helpful in facilitating work, such as transporting very large amounts of material and this screw feeder has the advantage of long or sustainable tool operation. In industry, damage often occurs erratically and must undergo component replacement that is not in accordance with the routine maintenance schedule. In designing this maintenance machine, Ishikawa diagrams are used to analyze the causes and effects of component damage to the screw coal feeder, while to analyze other damage parameters and scheduling maintenance and planned component replacements, the Failure Mode and Effect Analysis (FMEA) method can be used. The results of this study indicate that the cause of the damage consists of several factors including humans, machines, materials, and methods. The actions that must be taken on the components include checking for wear and lubrication so that these components are always in good use. Based on the results of the calculation of the reliability of the screw coal feeder machine, the reliability of the screw feeder leaf component is 95.3% and the screw feeder casing component is 94.6%. This can also be seen from the mean time between failure (MBTF) for the leaf screw feeder component of 116.66 hours and the MBTF for the casing screw feeder component of 142.85 hours. With the application of the Ishikawa diagram and FMEA on the screw coal feeder maintenance system at steam power plant company (PLTU) PT XYZ in Indonesia. The maintenance implementation aims for a better planned. The actions that must be taken on the components include checking for wear and lubrication so that these components are always in good use. Based on the results of the calculation of the reliability of the screw coal feeder machine, the reliability of the screw feeder leaf component is 95.3% and the screw feeder casing component is 94.6%. This can also be seen from the mean time between failure (MBTF) for the leaf screw feeder component of 116.66 hours and the MBTF for the casing screw feeder component of 142.85 hours. With the application of the Ishikawa diagram and FMEA on the screw coal feeder maintenance system at PLTU PT XYZ, the maintenance implementation becomes better planned. The actions that must be taken on the components include checking for wear and lubrication so that these components are always in good use. Based on the results of the calculation of the reliability of the screw coal feeder machine, the reliability of the screw feeder leaf component is 95.3% and the screw feeder casing component is 94.6%. This can also be seen from the mean time between failure (MBTF) for the leaf screw feeder component of 116.66 hours and the MBTF for the casing screw feeder component of 142.85 hours. With the application of the Ishikawa diagram and FMEA on the screw coal feeder maintenance system at PT XYZ, the maintenance implementation becomes better planned. the reliability of the screw feeder leaf component is 95.3% and the screw feeder casing component is 94.6%. This can also be seen from the mean time between failure (MBTF) for the leaf screw feeder component of 116.66 hours and the MBTF for the casing screw feeder component of 142.85 hours. With the application of the Ishikawa diagram and FMEA on the screw coal feeder maintenance system at PT XYZ, the maintenance implementation becomes better planned. the reliability of the screw feeder leaf component is 95.3% and the screw feeder casing component is 94.6%. This can also be seen from the mean time between failure (MBTF) for the leaf screw feeder component of 116.66 hours and the MBTF for the casing screw feeder component of 142.85 hours. With the application of the Ishikawa diagram and FMEA on the screw coal feeder maintenance system at PT XYZ, the maintenance implementation becomes better planned.

Effect of Variation of Quenching Process Cooling Media on Hardness and Microstructure of AISI 1020 Steel Subjected to The Pack Carburizing Process Using Graphite and Eggshell Carbon Media Zulhanif, Zulhanif; Supriadi, Harnowo; Prihastomo, Sigiet; Hanif, Muhammad; Ummah, Khairul
Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): June 2024
Publisher : INSTEP Network

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/jaset.v4i1.73

AISI 1020 steel is a low carbon steel which has a low selling price compared to medium carbon steel, high carbon steel, and alloy steel. This material is used as a construction material. in general, it is widely used and applied to machine components and construction components such as gears and shafts with relatively small loads. The purpose of this research is to increase the value of hardness. The pack carburizing process is carried out using graphite carbon media and egg shells at a temperature of 850 ºC. This process can increase the hardness of a material. The highest hardness value was obtained with the brine cooling medium of 457,111 BHN, then the water-cooling medium of 319,345 BHN, and finally the oil cooling medium of 248,204 BHN.

PENYULUHAN PEMANFAATAN LATEKS MENJADI PRODUK KEPADA PETANI KARET DI DESA SUNGAI LANGKA, KECAMATAN GEDONG TATAAN KABUPATEN PESAWARAN, LAMPUNG Savetlana, Shirley; Sukmana, Irza; Supriadi, Harnowo; Zulhanif, Zulhanif; Saputra, Rizal Adi; Iza, Abdillah; Riofasesi, Daffa
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol. 9 No. 2 (2025): Vol. 9 No. 2 Juli 2025
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v9i2.564

Luas perkebunan karet di Indonesia menurut data statistik adalah pada peringkat ketiga terbesar setelah sawit dan kelapa. Namun demikian petani karet masih sulit untuk memenuhi kebutuhan pokok mereka antara lain karena para petani menjual karet dalam bentuk lateks yang digumpalkan atau karet mentah. Sementara Indonesia walaupun merupakan negara pengekspor karet tapi juga sampai saat ini masih mengimpor karet jenis tertentu. Jika harga karet ditingkat petani tidak ada peningkatan maka petani akan sangat sulit memenuhi kebutuhannya maka lama kelamaaan, petani mungkin akan mengganti tanaman karet dengan tanaman lain sehingga produksi karet di Indonesia akan terus berkurang. Tim pengabdi dari Teknik Mesin Universitas Lampung menganggap hal ini penting sekali untuk dicarikan solusinya. Salah satu solusinya yaitu dengan cara meningkatkan pemahaman petani karet mengenai cara pembuatan lateks menjadi produk. Peningkatan pemahaman petani dilakukan dengan penyuluhan mengenai pembuatan lateks menjadi produk karet lembaran, sarung tangan karet, sepatu boot karet, dan karet pengikat. Hasil dari evaluasi kepada peserta penyuluhan menunjukan adanya peningkatan pemahaman pada petani karet mengenai cara membuat produk dari bahan lateks. Kata kunci: lateks, karet, karet lembaran, sarung tangan, sepatu boot karet, karet band, sungai langka

PENGARUH VARIASI ABU SEKAM DAN BENTONIT PADA CETAKAN PASIR TERHADAP KEKERASAN DAN STRUKTUR MIKRO 2) 1) HASIL CORAN ALUMUNIUM AA 1100 Tarkono, .; Supriadi, Harnowo; Sewandono, Doni
Jurnal Ilmiah Teknik Mesin FEMA Vol. 1 No. 3 (2013)
Publisher : FT UNILA

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The aim of this research is to know the physical and mechanical properties of aluminum casting results printed by using sand mold. Variation is made on the formation of mold sand where there happens a difference of the addition of binding substance rice husk ash and bentonite have been blended into a sand mould-forming composition. The Material used in this study is aluminum with purity levels above 99, which melted in the kitchen Dipper Krusible type and printed in sand mold. The tools which are used in testing hardness and micro-structure of tests in a row are: brinell hardness test and olympus metallurgical microscope. Brinell hardness testing uses the test with the standard ASTM E 10-01 and micro testing structure uses standard ASTM E 3 by way of looking at the specimen under a microscope. From this data, it can be obtained that the lowest hardness calculation of test results of 17.7636 HBW for compositions that vary on a mixture of bentonite and ash 6% husk 14%, and the maximum calculation of the hardness is obtained on the composition of the mixture of 10% and 8% bentonite husk ash, where the calculation of the hardness of 22.8100 HBW. In micro structure testing; looks that porosity in aluminum in great numbers when a comparison between bentonite and binding substance grey husk in the levels are quite different, causing the result of casting have much number of porosity, so that it causes the low level of the hardness. While for the comparison of levels of grey husk and bentonite which approach the same levels, When added to the composition of the sand mould-forming, micro structure test results showed that metal casting results have little amount of porosity causing aluminum castings results have a high level of hardness. Keywords : sand mold, porosity, hardness calculation, micro structure.

Utilization Of Fiber And Shell Particles Palm Oil As Substitute Materials In Producing Eternite Ceiling Kurniawan S, Dwi; Tarkono, .; Supriadi, Harnowo
Jurnal Ilmiah Teknik Mesin FEMA Vol. 1 No. 3 (2013)
Publisher : FT UNILA

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Assessment of science and technology in the field of materials engineering and the development of environmental issues require new breakthroughs in the provision of high quality materials and environmentally friendly. Nonmetallic materials Composite especially natural fibers that are more lightweight , malleable, corrosion resistance, low price and easy to obtain. research purposes to determine the mechanical properties of composite fiber and palm shell particles by measuring tensile strength, hardness and bending. In this study, the materials used are such as cement, fiber and oil palm’s shell, and using tools such as mold, ruler, sieve, balance sheets, and others. Composite fibers arranged randomly on the variation of particle mass fraction of 40% coconut oil, 35% of particles and 5% palm fiber, 30% particles and 10% fiber and 25% palm oil and 15% of particles of oil palm fiber. Pull Testing was conducted with reference to DIN 50 125, flexure testing with standard DIN 1101. Both tensile testing and flexural testing were conducted to determine the mechanical properties of the composite . The highest value of flexure test result is in the composite content of 25% particles and 15 % fiber particles is equal to 2:44 N/mm2 and the lowest value of bending test result is the composite content of particles 40% of palm oil is equal to 1365 N/mm2. While for the tensile test results , the highest value is in the composite content of 30% and 10% of particles of oil palm fiber at 0.479 N/mm2, and for the lowest drag value is on the particle content of 35% composite and 5 % palm fiber at 0.15 N/mm2 . As for the highest value in hardness test is in the composite content of 30% and 10% of particles Fiber HRH palm of 36.5, and the lowest value is 26.5% HRH the composite contains of 35% particle and 5% palm fiber. Keywords: Composite, fiber and palm shell particles, mechanical strength, tensile test, hardness test and bending test

Pengaruh Variasi Ukuran Partikel Marmer Statuari Terhadap Sifat Mekanik Komposit Partikel Marmer Statuari Mahayatra, I Gede; Supriadi, Harnowo; Savetlana, Shirley
Jurnal Ilmiah Teknik Mesin FEMA Vol. 1 No. 4 (2013)
Publisher : FT UNILA

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Abstract Manufacture a composite material with a matrix resin epoxy and marble statuary powder as filler is one industry-utilization of waste. Mechanical properties of the composite material is influenced by the particle size of the particles. variations in particle size would form different mechanical properties. This research was conducted to investigate the effect variations in particle size on the mechanical properties of the composite particles. In this research variation in particle size marble statuary used is 60 mesh, 100 mesh, 140 mesh and 200 mesh. Resin used is epoxy resin, and composition of the volume ratio between the matrix and the particles used in research was 80%: 20%. The method is used in the manufacture of composite hand lay-up method. Tests performed in this research is XRD testing on solid marble, bending strength, hardness, and SEM. XRD results obtained from the testing phase identified in the marble statuary are Ca2O5Si , CaCO3, CaO, SiO2 , MgO , MgCO3 , and SiC. Hardness value of composite particles of marble is 22.3 to 48.33 HB, and flexural strength values of composite particles of marble statuary is from 13.89 to 38.89 N/mm . Particle size is good for filler in the composite is 140 mesh particles. Marble composite particles 140 mesh particle size has a flexural strength and hardness highest, because SEM photograph composite of 140 mesh particle distribution in the matrix evenly, and there is a good bond between the matrix and particles of marble statuary. Keywords: Marble statuary, composite, particle size marble, epoxy , the mechanical properties

PENGARUH PERLAKUAN ALKALI TERHADAP KEKUATAN TARIK SERAT TANDAN KOSONG KELAPA SAWIT UNTUK DIGUNAKAN PADA KOMPOSIT SERAT TKKS Gultom, Firman; Supriadi, Harnowo; Savetlana, Shirley
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 2 (2014)
Publisher : FT UNILA

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Empty Palm bunches (TKKS) is one of the solid waste generated by industrial palm oil plantations which contain lots of fiber and is one of the natural fiber source that the availability of abundant in Indonesia, especially in the province of Lampung. TKKS fiber can be used as an alternative amplifier to composite materials. This research was conducted to determine the influence of the chemical composition of TKKS fiber and know the tensile strength from TKKS fiber by doing a tensile test. Alkaline treatment NaOH 5% given to fiber to separate lignin and contaminants that contained in fiber so that it can increase the tensile strength fibers. TKKS fiber is obtained processing palm oil factory by the process of boiling oil palm fresh fruit bunches with a pressure of 2.5 until 3atm at temperature 130 C during 50 – 60 minutes. TKKS already parsed and then selected and measured with a length of 6 cm and a diameter of 0.2 mm. And then given an alkaline NaOH 5%. In this research on the treatment of alkaline NaOH 5% provided that treatment during 0 hours (without treatment), 2 hour, 4 hour, 6 hour. Results from the study found that fiber tensile strength affected by the chemical composition on the fiber, the higher the tensile strength of the cellulose content is increasingly high. Tensile strength in fiber with alkali treatment 2 hours of 0,03528 Mpa, 0,3996% strain, 0,088288 MPa elasticity modulus, if compared with fiber without alkali treatment of 0,018946 MPa tensile strength, 0,2056% strain, 0,092149 MPa elasticity modulus. This is due to the levels of cellulose fibers with alkali treatment 2 hours increased by 58,2808%, if compared with fiber without alkali treatment by 13,2848%

PENGARUH TEMPERATUR TEMPERING TERHADAP ENERGI IMPAK DAN POLA PATAHAN PADA BAJA AISI 1045 Supriadi, Harnowo; Primartin, Abbit; Zulhanif, Zulhanif; Suudi, Ahmad
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 1 (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.v13i1.1961

The study of the effect of low temperature quenching cooling media on the value of toughness and types of fractures in AISI 1045 steel aims to determine the mechanical properties of increasing the value of toughness and ductility in steel. AISI 1045 steel is heated at a temperature of 850°C held for 60 minutes and then quenched quickly to a low temperature. The medium used is water. This tempering process can increase the impact energy. The impac energy value obtained at a temperature of 350°C is 18,33 Joule. Then at a temperature of 450°C it increases by 80 Joule, after that it increases again at a temperature of 550°C which is 121,33 Joule, the value increases higher at a tempering temperature of 650°C by 135,67 Joule. Observation of the type of fault shows that the higher the temperature the more ductile it can be seen from the results of the uneven and fibrous surface. Impact energy is influenced by variations in tempering temperature. When the tempering temperature is increased, the impact energi also increase. Keywords: AISI 1045 Steel, Quenching, Tempering, Impact Energy, Types of Fractures

Pengaruh Variasi Media Pendingin Bersirkulasi dan Pembukaan Katup pada Proses Quenching Terhadap Nilai Impak Baja AISI 1045 Julian, Bastiyan Dwi; Supriadi, Harnowo; Sugiyanto
Jurnal Ilmiah Teknik Mesin FEMA Vol. 3 No. 1 (2025)
Publisher : FT UNILA

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Baja AISI 1045 merupakan baja karbon sedang dengan kadar karbon 0,45%. Karakteristik baja ini dapat dimodifikasi melalui perlakuan panas, salah satunya proses quenching. Proses ini melibatkan pemanasan hingga 800°C dengan waktu tahan 15 menit, kemudian didinginkan cepat menggunakan variasi media pendingin tersirkulasi dan bukaan katup yang berbeda. Media pendingin yang digunakan meliputi air, larutan garam, dan solar, masing-masing dengan bukaan katup 180°, 90°, dan 45°. Pengujian sifat mekanik dilakukan menggunakan metode Charpy impact test. Hasil pengujian menunjukkan nilai impak raw material sebesar 0,154 J/mm². Setelah proses quenching, nilai impak pada media air berturut-turut sebesar 0,558; 0,570; dan 0,591 J/mm², pada larutan garam sebesar 0,504; 0,516; dan 0,525 J/mm², serta pada solar sebesar 0,637; 0,660; dan 0,670 J/mm². Struktur makro hasil fraktografi menunjukkan patahan crystalline dan fibrous. Hasil ini menegaskan bahwa media pendingin solar dengan bukaan katup 45° menghasilkan nilai impak tertinggi, sehingga direkomendasikan untuk meningkatkan ketangguhan baja AISI 1045.

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