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All Journal Jurnal Mechanical Turbo : Jurnal Program Studi Teknik Mesin Journal of Applied Science, Engineering and Technology (J. ASET) Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung
Harnowo Supriadi
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Jurnal Mechanical

 1 
Pengaruh Perlakuan Alkali terhadap Kekuatan Tarik Serat Tandan Kosong Kelapa Sawit untuk Digunakan pada Komposit Serat Tkks Harnowo Supriadi
JURNAL MECHANICAL Vol 5, No 1 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

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 1300C 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%.Keywords : TKKS fiber, the treatment of alkaline, chemical composition.
STUDI EKSPERIMENTAL TENTANG PENGARUH VARIASI RAPAT ARUS PADA HARD CHROME ELECTROPLATING TERHADAP KARAKTERISTIK PERMUKAAN BAJA KARBON RENDAH Harnowo Supriadi
JURNAL MECHANICAL Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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The objective of the research is to investigate the effect of  hard chrome electroplating on low carbon steel surface characteristic. This experimental research used low carbon steel as  material  that has been coated by hard chrome electroplating,  chromium powder, and Pb alloy as cathode.  The instrument for the research were rectifier, hardness testing machine LECO M-400-H1, optical microscope and  digital camera. This research had been performed by making variation of current ((15 A/dm2, 30 A/dm2, 45 A/dm2 and  60 A/dm2).The result of this research shows that the maximum hardness of low carbon steel after coated by hard chrome electroplating was 576,50 VHN, when hard chrome electroplating had been performed on current 45 A/dm2. Beside that, on the same current (45 A/dm2) also gained maximum chrome layer (38,65 µm).Keywords: low carbon steel, hard chrome electroplating, hardness,  deep of coated.
Pengaruh Variasi Temperatur Artificial Aging 150ᵒC, 170ᵒC dan 190ᵒC Terhadap Sifat Kekerasan dan Struktur Mikro Al-2024 Okta Rianda; Zulhanif Zulhanif; Harnowo Supriadi
JURNAL MECHANICAL Vol 13, No 1 (2022): Maret 2022
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v13.n1.202203

Abstract

The use of aluminum in the automotive industry has increased since 1980 and continues to increase in line with the increase in the number of motorized vehicles in Indonesia. Automotive components derived from aluminum alloys are required to have good strength. To have good strength, aluminum is usually combined with elements such as: Cu, Si, Mg, Zn, Mn, Ni, and so on. Aluminum-Copper Alloy (Al-Cu) is widely used in automotive components such as engine components that work at high temperatures, for example in the piston and cylinder head of the combustion motor. The mechanical properties of Al-Cu are needed and fulfilled in automotive components, therefore it is necessary to increase the mechanical properties of the Aluminum-Copper (Al-Cu) alloy. This research will be carried out using aluminum alloy Al-Cu with 2024 series which will receive heat treatment at a temperature of 4500C with quenching cooling method and then receive artificial aging treatment with temperature variations of 1500C, 1700C and 1900C. This research was conducted to determine the comparison of hardness and microstructure of aluminum before and before receiving artificial aging treatment. In this study, the results of the chemical composition test were obtained with the percentage of Al of 90.6% and the percentage of Cu being 5, 90%. The highest hardness value is found in Al-Cu material with artificial aging process with a temperature variation of 1900 C, the hardness value is 74.4 (HRB) which has an increase of 24% from the hardness value of the material without heat treatment. The results of the microstructure test showed that the Al-Cu material after the artificial aging process at a temperature of 1900C had more black grains and the Al-Cu grain boundaries tended to be more dense and regular. This can be interpreted that in materials that are treated with artificial aging there are precipitates or the formation of a second phase which causes the material to be harder and have better mechanical properties.Keywords: Alluminium Alloy, Artificial Aging, Hardness, Micro Structure
Co-Authors Dedy Rizaldy Deva Agus Setiawan EKO BUDIYANTO Irza Sukmana Kemas Ridhuan Muhammad Badaruddin Muhammad Riadi Barsuma Jaya Okta Rianda Shirley Savetlana Zulhanif Zulhanif Zulhanif Zulhanif