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All Journal Rekayasa Mesin Journal of Engineering and Management in Industrial System
Sonief, Achmad As’ad
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Industrial & Manufacturing Engineering Mechanical Engineering

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Variasi Kekencangan Mula (Pre-Tension) Satu Arah pada Reinforcement Fibre Panel Komposit terhadap Kekuatan Tarik Oerbandono, Tjuk; Wardhana, Bayu Satriya; K., Praisy Meivy; Sonief, Achmad As’ad
Rekayasa Mesin Vol 5, No 2 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (665.412 KB)

Abstract

Composites consist of more than one type of material that is designed to get a combination of the best characteristics of each constituent components. This research was conducted to determine the effect of variations in one direction of the pre tension on reinforcement fibre to the tensile strength of composite panel. The produced composite composed of woven roving type E-glass fibres and polyester resin 108. The resulted composites were made by hand lay-up method. The applied pre tension variations in the experiment are 0N, 5N, 10N, 15N, and 20N. Tensile testing was done by using a universal tensile testing machine in accordance with ASTM D 3039. From the measurements known that the applied pre tension on reinforcement fibre influence the tensile strength of the composite. Variations of pre tension from F = 0 N up to F = 20 N showed that the composite’s tensile strength tend to increase. Reinforcement fibre without pre tension or F= 0 N has the lowest tensile strength value 235.33 N/mm2, while the highest tensile strength of composite 367.02 N/mm2 belong to the reinforcement fibre with one direction pre tension of 20 N.Keywords: Pre-Tension, Reinforcement Fibre, Composite Panel, Tensile Strength
Karakteristik Pembakaran Difusi Campuran Biodiesel Minyak Jarak Pagar (Jathropha Curcas L) - Etanol/Metanol Pada Mini Glass Tube Al Banjari, M. Arsad; Yuliati, Lilis; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (985.498 KB) | DOI: 10.21776/ub.jrm.2015.006.01.12

Abstract

Diffusion is a combustion which is performed on a diesel engine, biodiesel as a biofuel is used to replace fossil fuels. Many studies have looked at the effect of a mixture of biodiesel fuel-ethanolmethanol-diesel with different percentages in terms of engine performance and exhaust emissions, but have never done research on the characteristics of combustion and interface evaporation. This paper discusses how the comparison of the characteristics of the diffusion combustion mixture of biodiesel and biodiesel-ethanol-methanol in mini glass tube. The results showed that the use of biodieselethanol occurred many explosions flame and lift off than biodiesel-methanol. Biodiesel-ethanol evaporation interfaces tend to be flat because there were many explosions so that the liquid fuel out of the burner. The use of biodiesel-methanol flame produces more stable than biodiesel-ethanol.
Pengaruh Fraksi Volume Dan Panjang Serat Pelepah Lontar (Borassus Flabellifer) Terhadap Kekuatan Tarik Dan Kekuatan Impak Komposit Bermatrik Epoksi Tuati, Amros Alfonsius; Purnowidodo, Anindito; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (425.362 KB) | DOI: 10.21776/ub.jrm.2015.006.01.5

Abstract

This study was conducted using epoxy resin as ligature and midrib lontar fibers (borassus flabellifer) as brace. Composite was made by varied fiber volume fraction 10%, 30% and 50% with length variation 10 mm, 20 mm, and 30 mm. The composite production used hand lay-up method. The test result showed the highest composite tensile strength about 31.607 Mpa in volume fraction 10% with fiber length 30 mm. The lowest composite tensile strength was about 16.855 Mpa in fiber volume fraction 10% and 20 mm in fiber length. Moreover, the highest composite impact strength was 0.00163 J/mm in fiber volume fraction 50% with fiber length 30 mm and the lowest impact strength was 0.00214 J/mm 2 in fiber volume fraction 10% and 10 mm fiber length. The kind of composite fracture tended to have brittle fracture with mechanism of fiber pull out.
Pengaruh Tekanan Vacuum terhadap Kekuatan Tarik dan Kekuatan Lentur pada Biokomposit Serat Purun Tikus (Eleocharis Dulcis) Fauzi, Yusuf Rizal; Sonief, Achmad As’ad; Suprapto, Wahyono
Jurnal Rekayasa Mesin Vol 7, No 3 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (471.806 KB) | DOI: 10.21776/ub.jrm.2016.007.03.4

Abstract

In particular composite materials made from polymer biocomposite material which is now becoming an alternative to the metal and is very widely applied in the manufacturing industry because of its corrosion resistance and high strength ratio of specific gravity. Natural fiber began to be used for reinforcement in composites instead of synthetic fiber such as glass fiber because of its environmental friendly and widely available in nature. Meanwhile, the application of the natural fiber is still not optimized. The method to produced the composite is by isolate and vacuuming mold composite specimens (biocomposites) in a container (the media) to reduce the pressure around, so that the composite (biocomposite) is not in direct contact with the air, void in composite can decrease the strength of the composite. The matrix is 157 BTQN Polyester and the catalis is MEKPO with concentration of 1%. Specimens have been tested mechanically those are tensile testing and flexure testing and the specimen was evaluated using SEM and fracture was observe using macro photos. The results showed that there are significant effect of vacuum pressure level to the biocomposite tensile strength and flexural strength. Specimens with angular orientation 0/90/0/90 shows the tensile strength of 54.7 MPa and bending strength of 243 MPa.
Pengaruh Kecepatan Pengadukan Proses Rheocasting terhadap Struktur Mikro dan Fluiditas Paduan Al-Cu Putra, Muhammad Rezki Fitri; Suprapto, Wahyono; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.6

Abstract

Rheocasting with the aim of developing and offering solutions to problems related to the casting process. Rheocasting is a casting process that utilizes solidification agitation to change the dendritic structure to non-dendrite (globular) by giving a variation of the stirring speed. Al-Cu is a metal material that has high strength-to-weight ratio characteristics from steel, good fatigue resistance, and heat-treatable. But fluidity is low, this triggers casting defects such as shrinkage and miss-run. The defect occurs because the cooling process of liquid metal is not uniform or there is gas trapped in molten metal. Defects in casting can significantly reduce material mechanical properties. The results show morphological changes in the dendrites to rosette to globular with increased stirring speed and grain diameter decreasing with increasing stirring speed. Increasing the stirring speed also produces a positive trend of the fluidity value of Al-Cu alloys in each mold thickness.
OPTIMIZATION OF VARIABEL HELIX ANGLE PARAMETERS IN CNC MILLING OF CHATTER AND SURFACE ROUGHNES USING TAGUCHI METHOD Hardinsi, Festo Andre; Novareza, Oyong; Sonief, Achmad As’ad
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 9 No. 1 (2021)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jemis/2021.09.01.3

Abstract

In the manufacturing industries, the main problem in process of operating CNC milling machine was chatter effect (self-excited vibration) which increases the quality of the surface roughness. In this study is to determine optimal value of parameters for chatter and surface roughness. The chatter measured using accelerometer MPU-6050 with Arduino by software LabVIEW-2019 based on peaks-FFT value and the surface roughness measured by SJ-301 tester. The research parameters like variable helix angle, spindle speed, feed rate, and depth of cut using stainless steel 304 by Taguchi method. The optimum parameters value obtained are variable helix 35/38 degrees, spindle speed 3000 RPM, feed rate 150 mm/min and depth of cut 0.4 mm. Based on ANOVA value, the variable helix angle and depth of cut are found to be significant for chatter and surface roughness. The depth of cut was high contribution by ANOVA chatter by 93.84% and surface roughness by 91.93%.
Co-Authors Amros Alfonsius Tuati, Amros Alfonsius Anggara, Teuku Anindito Purnowidodo Bayu Satriya Wardhana Fauzi, Yusuf Rizal Hardinsi, Festo Andre Lilis Yuliati M. Arsad Al Banjari, M. Arsad Oyong Novareza Praisy Meivy K. Pratikto Pratikto Putra, Muhammad Rezki Fitri Tjuk Oerbandono Wahyono Suprapto