Femiana Gapsari
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya

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Pengaruh Fraksi Volume Terhadap Kekuatan Tarik dan Lentur Komposit Resin Berpenguat Serbuk Kayu Gapsari, Femiana; Setyarini, Putu Hadi
Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

On the research, composite was made from polyester with volume of filler fraction variable of 15%, 30%, 45% and the type of filler was Mahogany (Swietania mahogani). The filler measurement used was 50 mesh. Polymer matrix used was BQTN 157 unsaturated resin polyester. The tensile test of experiment specimen was based on ASTM D638 M-93. and the bending specimen was based on D790-92 Standard. The higest of tensile strength on the volume fraction of 30% that is of 2.081916 kg/mm2 . For the composite material with particle of composite material mahogany with filler volume fraction of 15% had the average flexural strength of 34.98 N/mm². On the particle with volume fraction of 30% had the highest average flexural strength of 45.6780 N/mm². The higest Modulus of Elasticity(E) and Shear Modulus (G) was owned by the composite with filler volume of 635.464 kg/mm2 dan 958.85 MPa Keywords : Composite, volume fraction, tensile strength, flexural strength
Optimasi Kualitas Hasil Pengelasan Gas Metal Arc Welding (GMAW) Baja ASTM 283 Grade A dengan RSM (Response Sufrace Methodology) Gapsari, Femiana; Sulistyorini, Dwi Hadi
Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research aimed at the investigation of the effect of welding current, welding voltage, and welding speed on the hardness of weldment. The material used in this research is steel ASTM 283 grade A. An optimization approach is performed in order to determine the variables combination of the welding current, voltage, welding and welding speed to maintain the weldment to be below hardness and was closer with parent metal hardness. With application Response Surface Methodology(RSM) mathematical relationship between the welding process input parameters and output variable like hardness of welded joint in order to determine the welding input parameters that lead to desired weld hardness. RSM design of experiment techniques can be very efficiently used in the optimization of welding parameters in GMAW process. Formulation of equation is done with the help of which hardness can be predicted as Y = 218.624 +10.31 I+1.614V-4.017s-1.723 I2+0.929 s2.Keywords : Optimization, Response Surface Methodology (RSM), Hardnes, GMAW.
Pengaruh Besar Arus Listrik pada Proses Wire Edm Terhadap Profile Error Involute Roda Gigi Lurus Gapsari, Femiana; Sugiarto, Sugiarto; Bagus, Nugroho
Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Wire Electric Discharge Mechine (EDM) is one of non conventional metal cutter machines. This machine is used to form machine components which has complex form and needs high precision. One of the machinery parameters which influences cutting precision on Wire EDM is the amount of pulse current. The form of involute profile of gear is a form which has complexity and high precision which often changes the form of geometry profile. This studyis aimed at investigating the extent of the influence of the amount of current parameter on Wire EDM towards the profile error involute spur gear. Thi study is experimental design, the independent variable used is pulse current with variation of 3 ampere, 4 ampere, 5 ampere, 6 ampere, and 7 ampere. The dependent variable in this study is profile error involute spur gearwhich later will explain the extent of cutting distortion. The result of this study showed that the higher the electric current, the higher the level of profile error involute spur gear. This means that the level of the precision is getting lower. The level of the lowest profile error involute, which is 0.0907 mm, found at 3 ampere pulse current, while the highest level of profile error involute, which is 0.1256 mm, found at 7 ampere electric current.Keywords: wire edm, pulse current, profile error involute, spur gear.
PERANCANGAN KESEIMBANGAN LINTASAN PRODUKSI AMMUNITION BOX MENGGUNAKAN METODE RANK POSITIONAL WEIGHT Srijayasari, Hariti; Pratikto, Pratikto; Gapsari, Femiana
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2018): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 9 2018
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

PT XYZ adalah perusahaan industri manufaktur di Indonesia dalam lingkup BUMN (Badan Usaha Milik Negara) yang bergerak dalam bidang produk militer. Objek pengamatan yang diambil adalah produk pendukung yaitu ammunition box. Ammunition box adalah tempat untuk menempatkan munisi yang diproduksi. Total waktu siklus di bagian pembuatan tutup dan pembuatan badan ammunition box berbeda sehingga menyebabkan bottleneck pada bagian perakitan akhir yang dapat mempengaruhi efisiensi lini produksi. Penumpukkan badan ammunition  box di perakitan akhir mengakibatkan proses perakitan di bagian perakitan akhir terhambat. Oleh karena itu, tujuan dari penyeimbangan lintasan produksi adalah untuk membantu perusahaan manufaktur dalam mendesain dan pengimplementasikan perbaikan terhadap sistem produksi yang ada saat ini. Dalam penelitian ini metode yang digunakan adalah metode Helgeson Birnie (Rank Positional Weight) Dalam metode ini dijelaskan bahwa proses perakitan terdiri dari beberapa elemen pekerjaan dengan urutan ketergantungan terhadap elemen pekerjaan sebelumnya. Hasil pengolahan data menunjukkan metode Helgeson Birnie (RPW) memberikan efisiensi lini sebesar yaitu 83,17% pada bagian pembuatan tutup ammunition box, 97,99% pada bagian pembuatan badan ammunition box, dan 100% pada bagian perakitan akhir. Hasil rancangan Helgeson Birnie (RPW) memberikan peningkatan efisiensi yaitu 39,11% pada bagian pembuatan tutup ammunition box, 53,45% pada bagian pembuatan badan ammunition box, dan 7,2% pada bagian perakitan akhir. Kata kunci : keseimbangan lintasan, manufaktur, waktu siklus
Optimasi Parameter Pembubutan Terhadap Kekasaran Permukaan Produk Utami Dewi, Franscisca Gayuh; Gapsari, Femiana
Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Machining parameters in turning processes including cutting speed, depth of cut, feed rate, and the length of the cutting parameters affect the product quality. One of the required product quality is the level of surface roughness. Reseach used response surface experimental based on central composite design to develop the empirical method of relationship between cutting parameters and surface roughness. Furthermore, an optimization is also conducted by using desirability function approach to determine the combination of cutting parameters in order to have low surface roughness of product. The results show that the machining parameters (depth of cut, length of cutting, cutting speed) have significant impact to the surface roughness of product. Based on the results, the mathematical model: Y = 1.109 -0.068(X ) ? 0.111(X 2 )-0.098(X 3 ) + 0.268 (X 1 ) 2 + 0.17 (X 2 ) 2 + 0.106 (X 3 ) 2 + 0.086X 1 X 2 - 0.073XKeywords: surface roughness, machining, depth of cut, cutting speed.