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PENGARUH UNSUR SILIKON PADA ALUMINIUM ALLOY (Al – Si) TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO Ratih Ponco K.S; Erwin Siahaan; Steven Darmawan
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: PENGARUH UNSUR SILIKON PADA ALUMINIUM ALLOY (Al – Si) TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO Ratih Ponco K.S., Erwin Siahaan dan Steven Darmawan Jurusan Teknik Mesin, Fakultas Teknik Universitas Tarumanagara Aluminum is one of type in material non-ferrous metals are frequently and widely used in fields of application in industry. One application that performed in the industrial world, namely Aluminum Silicon (AlSi) which are used for the motor piston components. To get better mechanical properties then the integration of Aluminum Silicon research done by arranging the variety of Si element content on a percentage of 6, 8, and 10% Si.Testing is done by using a blend of 10% genuine with further lowering the Si content to reach 6% and 8% by adding pure aluminum. The test showed that the level of harness decreased 12,5% and also the ability of toughness decreased by 4%. Observation show that the microstructure is relatively homogeneous and there is a dominant form of micro-structure of pure Al and several dendrites CuAl.

KARAKTERISTIK SIFAT MEKANIS DAN STRUKTUR MIKRO PROSES AUSTEMPER PADA BAJA KARBON S 45 C DAN S 60 C Lim Richie Stifler; Sobron Yamin Lubis; Erwin Siahaan
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: Steel is an iron-carbon alloys containing concentrations of other alloys having a different composition and treatment materials, steel properties can be changed by heat treatment. The heat treatment process serves to increase the strength of a steel material. The nature of the material can be turned into a more robust and resilient heat treatment process, if done properly and correctly. Austempering process is just one example of the heat treatment process at steel that aims to improve the mechanical properties of the steel S 45 C and S 60 C. austempering process performed on the steel S 45 C and S 60 C aims to increase the hardness and toughness of the steel. Austempering process is done by austenisasi advance with temperature 8500C and held for 60 minutes, after which the process is carried out with 3 election austempering temperature of 3500C, 4500C, 5500C and held for 30 minutes. The method used to test the results of austempering is tensile testing using ASTM A370- 12a, Vickers hardness test and microstructure observation using a digital microscope. In the test results tensile steel S 45 C and S 60 C values obtained an increase in ductility and toughness of 17.1 % on steel S 45 C and 17 % on steel S 60 C. This value is obtained from the calculation of ultimate tensile strength test specimens that have not been in austempering process with a specimen that has been in the process of austempering at 3500C , and the results of testing hardness of the steel S 45 C and S 60 C obtained hardness value of 44% increase in steel S 45 C and 46 % on steel S 60 C. value this is obtained from the calculation of the average value of the test specimen is not in the process of austempering with a specimen that has been in the process of austempering at 3500C .

KARAKTERISTIK SIFAT MEKANIK DAN STRUKTUR MIKRO PADA MATERIAL Sn-0,7Cu-“X”Zn Ridwan Adidarma; Erwin Siahaan; Abrar Riza
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: Lead (Pb) in solder has been used for decades in industries of electronic equipment. Mostly in the lead solder old electronic equipment containing 63% (Sn), 37% lead (Pb). Heating solder in high temperature steam generating heat which can damage the respiratory system. The purpose of this analytic is to obtain the characteristics of the mechanical properties of the alloy Sn-0,7Cu- "X" Zn better than the Sn-Pb alloy as an alternative to non-lead solder alloy material. Tests conducted in the form of density, melting temperature, metallography, shear strength, and hardness. The effect of addition of Zn alloy Sn-Cu-Zn increase hardness value of each acquired 85% of the material Sn-0,7Cu-10Zn, 81% were obtained from material Sn-0,7Cu-11Zn and 70% was obtained from material Sn -0,7Cu-11Zn. While the effect of adding Zn alloy Sn-Cu-Zn can increase the shear strength of each of about 29.4% on a material- 0,7Cu-10Zn Sn, 65% in material Sn-0,7Cu-11Zn and about 140% is obtained from material Sn-0,7Cu- 12Zn.

KARAKTERISTIK SIFAT MEKANIS BAJA LATERIT TERHADAP PROSES PENGEROLAN Roy Hasudungan; Erwin Siahaan; Rosehan Rosehan; Bintang Bintang
Jurnal Ilmiah Teknik Mesin POROS Vol 13, No 1 (2015): Jurnal Imliah Teknik Mesin Poros
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstrak: Pemanfaatan sumber daya alam di indonesia merupakan salah satu hal yang harus dilakukan karena yang kita ketahui Indonesia memiliki banyak sekali sumber daya yang melimpah dan harus diolah untuk mendapatkan sesuatu yang berguna bagi kehidupan sehari-hari dan bermanfaat bagi kehidupan seluruh warga Indonesia. Baja laterit merupaknan baja yang didapat dari pemurrnian dan pengecoran nikel pig iron. Tujuan dari penelitian ini ialah untuk mengetahui nilai kekerasan baja laterit serta mengetahui struktur mikro pada baja laterit, adapun cara untuk mengetahui proses tersebut ialah dengan cara mencor baja laterit tersebut dengan dicampur dengan zat lainnya, lalu setelah proses pengecoran dilakukan proses pengerolan dengan hot rolling dengan temperatur 900 °C dengan bermacam reduksi yang bertujuan untuk mengetahui nilai kekerasan dan peruabhan struktur mikro pada setiap reduksi yang terjadi. Kemudian setelah dialkukan proses pengerolan maka dilakukan proses pengujian kekerasan dan metalography,dan untuk memudahkan proses pengujian tersebut maka specimen dipotong dengan panjang 2cm lalu specimen tersebut dimounting dengan menggunakan resin.

ANALISIS KEMAMPUAN PROSES PELAPISAN POLYUREA PADA ACRYLIC DENGAN KETEBALAN TERTENTU TERHADAP SIFAT MEKANIK Jason Arie Putra; Erwin Siahaan; Steven Darmawan
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 2 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: Coating became quite common. The coating serves as a conduit of color and also to cover the base material. Polyurea coating is a new innovation in the field of industry, so far polyurea coatings are used to coat the walls of the building and also the roof of the building to tackle the problem of leakage. This study explains how large the influence of the Polyurea coatings to acrylic. In this study which is distinguished by variations in thickness 3mm acrylic, 5mm and 8mm. This study also discusses the tensile resilience and resistance to shock loads. The purpose of this study was to determine how much influence the Polyurea coatings by comparing with Polyurea acrylic coated and uncoated. As an example of the results obtained from tensile tests that 3mm acrylic coated and uncoated increased by 39.6% acrylic 5mm by 0.66% and 1.65% acrylic 8mm. Polyurea coatings can not deliver maximum results on specimens that have smooth surfaces, so that we can see that in every test carried downhill result.

OPTIMASI PARAMETER 3D PRINTING TERHADAP WAKTU DAN WARPING DENGAN PENDEKATAN METODE TAGUCHI Mase Hideaki; Agus Halim; Erwin Siahaan
POROS Vol. 18 No. 1 (2022): Jurnal Ilmiah Teknik Mesin Poros
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/poros.v18i1.19143

Fused Deposition Modeling (FDM) is one of the most popular 3D printing technology that used at academic and business purposes due to the easiness of the manufacture process that it held. But, one of the most major problems that usually occur in the industry is the frequentness of damaged and deficiency on the result of printing, especially when it is printed using the ABS filament. Although, ABS is one of the filaments which has a lower cost compared to others, but has a bigger value per gram on the printing sectors compared to PLA filaments. It could be a good business prospect if it can be handled on the problems. Therefore, the knowledge on how to prevent the problems, and finding an efficiency on the various of infill pattern, would be one of the key of success in this industry. In this article, a research on finding optimum parameters against the time and quality of the product using the Taguchi method, and also ASTM D-638 is also needed to find the best infill pattern against the tensile strength that an ABS filament have on the mechanical properties. As a result, the parameters, nozzle temperature and bed temperature have a small impact on producing time, but have a greater impact on the quality of printing product. Besides, the infill pattern which has the biggest tensile strength on smaller density is Trihexagon. Meanwhile, the Lines infill has the biggest standard of deviation, which endure the most stress on the bigger density compared to Triangles and Trihexagon.

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