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All Journal Semesta Teknika JMPM (Jurnal Material dan Proses Manufaktur) Jurnal POLIMESIN Jurnal Pengabdian Masyarakat Teknik Eksergi: Jurnal Teknik Energi Ekalaya: Jurnal Pengabdian Kepada Masyarakat Indonesia Mitra Abdimas: Jurnal Pengabdian kepada Masyarakat
Sunardi, Sunardi
Universitas Muhammadiyah Yogyakarta
Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Optimalisasi Desain Frame Sepeda Menggunakan Software Autodesk Inventor 2015 Sunardi, Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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Abstract

Bicycles become one of the environmentally friendly land transportation and are increasingly demanded by wider community. Frame a main component of the bikes that must safely be designed because it is the haviest part compared to the other components. MUSTANG hybrid bikes use steel Hi-Ten (High Tensile Steel) for their frames. The density of such material is relatively high in comparison with other frame materials such as aluminum alloy, carbon fiber, and titanium. Thus, it needs to be redesigned to optimize frames in terms of mass, stress, displacement, and safety factor. This research was first measureing the dimensions of a MUSTANG bike frame. Next, it was drawn, and simulated using Autodesk Inventor Professional 2015 software. Simulation results were then used to optimize the frame design in terms of its mass, stress, strain, displacement and safety factor. The optimized design simulation shows that maximum stress and displacement being 14,75 MPa and 0,01617 mm, respectively. In addition, minimum safety factor and mass being 14,94 and 3,1323 kg, respectively. The optimum bike frame was found at modification frame 5 with maximum stress of 8,40 MPa, maximum displacement of 0,01782 mm, minimum safety factor of 15 and minimum mass of 3,1343 kg. 
Peningkatan Ketahanan Korosi Pada Material Biomedik Plat Penyambung Tulang SS 304 Dengan Gabungan Metode Shot peening dan Electroplating Ni-Cr Sunardi, Sunardi; Iswanto, Priyo Tri; Mudjijana, Mudjijana
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Semesta Teknika

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Abstract

Stainless steel (SS) 304 is widely used as biomedical materials because of its lower cost and its availability. However its corrosion resistance is lower than that of the SS 316L. The purpose of this study is to determine the influence of the combination surface treatment i.e. shot peening treatment and electroplating Ni-Cr on the corrosion resistance in simulated body fluid (SBF) of SS 304 material. The shot peening treatments were carried out using a variable period of 5, 15 and 30 minutes. Diameter steel balls of 0.6 mm with a hardness of 40-50 HRc, was applied. Pressure compressor was maintained in the range of 6 -7 kg / cm2 with nozzle diameter and the distance between nozzle and the specimen of 5 mm and 10 cm respectively. After shot peening process, the specimens were nickel-electroplated using a voltage of 2 V at current of 0.03 A with the distance between the electrode of 4 cm for 15 minutes. After nickel-electroplated process the specimens were chrome-electroplated using a voltage of 4.5 V at current 0.3 A with the distance between the electrode of 15 cm for 5 minutes. The specimen was then tested its corrosion rate in the test medium SBF using Galvanostat M 273 in the range of -20 mV s / d 20 mV. The corrosion test results show that SS 316L and SS 304 without treatment have corrosion rate respectively 1.212 X 10-3 mm / year and 4,003 x 10-3 mm / year. Which means that corrosion rate of SS 304 is 333% higher than SS 316L. The corrosion rate after treatment shot peening 5, 15 and 30 minutes followed by Ni-Cr electroplating is respectively 2.121 x 10-3 mm / year, 0.554 x 10-3 mm / year and 0 mm / year (not detected by the measurement instrument).
Deteksi Cacat Bantalan Bola Pada Pompa Sentrifugal Menggunakan Spektrum Getaran Kamiel, Berli P; Mulyani, Mulyani; Sunardi, Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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Abstract

One of the common fault in the centrifugal pump is faulty bearing. Bearings play a very important role for smooth rotation of a shaft. A bearing condition must be constantly monitored to ensure top performance of a pump. Therefore, a method is needed to detect an early defect in the bearings. One of the most widely used methods for bearing faults detection is based on the vibration analysis. Vibration analysis can detect a defect in a bearing without having to disassemble the machine. Furthermore, and it is fast and easy to be implemented. This study aims to develop a fault detection method on the ball bearing using spectrum analysis by applying envelope analysis. This research uses experimental method with three bearings conditions i.e. normal (no fault), outer race fault, and inner race fault. The type of ball bearings used are self aligning double row bearings. The vibration signal from each of bearing condition is taken from the centrifugal pump vibration test rig and measured using accelerometer sensor which is acquired directly with DAQ and then processed into Matlab. The analysis gives the result of frequency spectrum and envelope spectrum. This study concludes that the high amplitude on the frequency that coincide with the frequency of Ball Pass Frequency Outer Race (BPFO) and Ball Pass Frequency Inner Race (BPFI) make an indication of damage to the bearing on the outer and inner race respectively. The envelope spectrum gives better results as compared to the result of the frequency spectrum. This is because the high amplitude of low frequency generated from other components is blocked and removed using a high-pass filter. Consequently, it becomes easier to detect a low amplitude of high frequency vibration signal from a faulty bearing.
PERANCANGAN MESIN VACUUM FORMING UNTUK MATERIAL PLASTIK POLYSTYRENE (PS) DENGAN UKURAN MAKSIMAL CETAKAN 400x300x150 (mm3) Irwansyah, Diki; Budiyantoro, Cahyo; Sunardi, Sunardi
JMPM : Jurnal Material Dan Proses Manufaktur Vol 1, No 2 (2017): DESEMBER 2017
Publisher : JMPM : Jurnal Material Dan Proses Manufaktur

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Abstract

Tujuan dari Perancangan ini adalah untuk menghasilkan desain mesin Vacuum Forming dengan ukuran maksimal cetakan (Mold) 400 x 300 x 150 (mm3), menggunakan 2 unit heater tipe strip dengan daya 250 watt/unit, dan menggunakan vacuum cleaner untuk proses vakum dengan vacuum (max) : 20 kPa (20.000 Pa) dan Airflow (max) : 26,6 l/s (0,0266 m3/dt) yang akan digunakan sebagai acuan dalam proses pembuatan mesin Vacuum Forming. Salah satu dari metode thermo forming yang sederhana adalah vacuum forming. Pada dasarnya metode ini dilakukan dengan memberikan perlakuan panas pada lembaran plastik hingga lembaran plastik menjadi lunak kemudian dibentuk pada cetakan dengan memberikan tekanan vakum. Ada beberapa parameter yang menentukan kualitas hasil cetakan plastik pada proses vacuum forming antara lain, jenis plastik, ketebalan plastik, temperatur pemanasan dan tekanan vakum yang digunakan. Pada perancanga mesin thermoforming vacuum ini sebagai bahan uji digunakan lembaran plastik polystyrene (PS) dengan panjang 420 (mm), lebar 320 (mm) dengan ketebalan 0,5 sampai 2 (mm). Hasil dari Perancangan ini selanjutnya digunakan sebagai acuan dalam proses pembuatan mesin Vacuum Forming.
PENGARUH DIAMETER STEEL BALL SHOT PEENING TERHADAP KEKASARAN PERMUKAAN, WETTABILITY DAN LAJU KOROSI PADA STAINLESS STEEL AISI 304 Sunardi, Sunardi; Nugroho, Aris Widyo; Julianto, Achmad Zamhari
JMPM : Jurnal Material Dan Proses Manufaktur Vol 1, No 2 (2017): DESEMBER 2017
Publisher : JMPM : Jurnal Material Dan Proses Manufaktur

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Abstract

Stainless steel (SS) 304 is material commonly used in biomedical applications, because this material is corrosion resistant, easyly obtained, relatively light, easyly formed and low price. However, its corrosion rate tend to be higher compared to the biomedical materials. Thus, it needs surface treatment to overcome its weakness. The purpose of this research is to determine the effect of shot peening on surface roughness, wettability and corrosion rate in Synthetic Body Fluid (SBF) of SS-304 material. The samples are circular shapes of 14 mm diameter and 4 mm thickness of SS-304 materials. The shot peening was conducted with nozzle distance of 100 mm, spraying pressure of 6 bar, spraying time of 10 minutes, and and shooting angle of 90º. Steel ball diameter being used are 0.4 mm, 0.6 mm, 0.7 mm, and the properties being characterized are surface rougness, wettability and corrosion resistance. The results shows that the shot peening can increase the surface roughness from 0.868 μm ± 0.056 μm for the raw material up to 2.248 μm ± 0.481 μm for shoot-peenned material using steel ball diameter of 0.7 mm. The corrosion resistance decreases from 55.83 ± 2.44 mpy for the raw material to 113.15 ± 7.51 mpy for the shoot-peenned material using steel ball diameter of 0.4 mm, and the increase surface hardness was found being 276 %, . In addition, wettability test indicates that sample surface after being shot peenned treatment to be hydrophilic.
Pengaruh Konsentrasi dan Waktu Aktivasi Katalis Palladium pada Electroless Plating Nickel Permukaan Plastik ABS Rahman, Muhammad Budi Nur; Sunardi, Sunardi; Wibisono, Auliandi Luthfi; Anggara, Bayu
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 1 (2018): JUNI 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.2122

Abstract

ABS plastic is widely used for automotive components and interior design because of its lightweight, easily shaped, strong, but low hardness, no friction-resistant, and heat resistant. Electro less plating is a method of metallization before electro plating to improve the quality and appearance. To get a good bond between plastic and metal is necessary to the activation of the palladium which is influence by concentration, temperature and activation time. The research aims to determine the influence of the palladium solution concentration and activation time of the electroless nickel plating process on surface roughness, layer thickness, hardness and wear resistance of ABS plastic. The concentration of palladium was prepared at 3%, 5% and 7% in HCl solution (37%). The activation time was carried out during 4 to 12 minutes. The research shows that those parameters increase wear resistance of the surface. In addition the activation time parameter is also found to increase layer thickness and roughness value of the specimens. Yet, those parameters are not found to affect significantly on its hardness value.
PENGARUH WAKTU DAN SUHU PROSES ELEKTROLESSPLATING NIKEL TERHADAP KARAKTERISTIK FISIK DAN MEKANIK PLASTIK ABS Sunardi, Sunardi; Rahman, Muhammad Budi Nur; Budiyantoro, Cahyo
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221237

Abstract

AbstrakPlastik ABS digunakan dalam industri otomotif, rumah tangga dan elektronik karena kekuatannya tinggi, keras, liat, tahan korosi, tahan panas, mudah dibentuk dan bisa dilapisi. Electrolessplating nikel adalah teknik metalizing bahan non logam agar bersifat logam. Penelitian proses electrolessplating nikel pada plastik ABS dilakukan dengan variasi suhu elektrolit yaitu 40oC, 50oC, 60oC, dan 70oC dan waktu proses pelapisan selama 4, 6, 8, 10 dan 12 menit. Karakterisasi yang dilakukan adalah mengetahui struktur mikro dan ketebalan lapisan menggunakan mikroskop optik, dan karakteristik mekanik meliputi, pengujian kekasaran,  kekerasan menggunakan Shore D Hardness dan pengujian keausan. Peningkatan suhu elektrolessplating meningkatkan kekasaran permukaan dari 0,170 µm pada suhu 40oC menjadi 0,422 ?m pada suhu 70oC sedangkan semakin lama proses elektrolessplating dapat menghaluskan permukaan dari 0,70 µm untuk waktu 4 menit menjadi 0,33 µm untuk waktu 12 menit. Peningkatan suhu dan waktu proses elektrolessplating menurunkan nilai keausan spesifik dari 1,9x10-3 mm2/kg pada suhu 40oC menjadi 0,4 x 10-3 mm2/kg untuk suhu 70oC dan 2,62x10-3 mm2/kg pada waktu 4 menit menjadi 0,66x10-3 mm2/kg untuk waktu 12 menit. Suhu dan waktu proses elektrolessplating tidak banyak meningkatkan nilai kekerasan rata-rata sebesar 84,5 SDH. Proses electrolessplating nikel pada suhu 50oC menghasilkan ketebalan lapisan optimum sebesar 5,56 ?m karena ion yang terbentuk semakin banyak  namun pada suhu 60oC dan 70oC ketebalannya berkurang sebesar 4,57 µm dan 3,72 µm. Penambahan waktu proses electrolessplating meningkatkan ketebalan lapisan, dari 1,29 ?m dalam waktu 4 menit menjadi 3,98 ?m dalam waktu 12 menit karena ion yang mengendap pada permukaan semakin banyak. AbstractABS plastic is used in the automotive, household and electronic industries because of its high strength, hardness, clay, corrosion resistance, heat resistance, easy to form and can be coated. Nickel electrolessplating is a technique of metalizing nonmetal materials to be metal. Research on the nickel electrolessplating process in ABS plastic was carried out with variations in the temperature of the electrolyte that is 40oC, 50oC, 60oC, and 70oC and coating time for 4, 6, 8, 10, and 12 minutes. Hardness and wear testing. An increase in temperature electro-less plating increase the surface roughness of 0.170 µm at a temperature of 40oC to 0,422 ?m at a temperature of 70oC, while the longer process of electroless plating smooth the surface of from 0.70 µm to 4 minutes to 0.33 µm for 12 minutes. An increase in temperature and the process time electro-less plating lower the value of wear specific than 1,9x10-3 mm2/kg at a temperature of 40oC to 0,4x10-3 mm2/kg for a temperature of 70oC and 2,62x10-3 mm2/kg at the time of 4 minutes to 0,66x10-3 mm2/kg for 12 minutes. The temperature and time of process electroless-plating not much increase the value of an average hardness of 84,5 SDH. The nickel electrolessplating process at a temperature of 50oC produces an optimum layer thickness of 5.56 ?m because more and more ions are formed but at a temperature of 60oC and 70oC the thickness decreases by 4.57 ?m and 3.72 ?m. The addition of electroless-plating process time increases the thickness of the layer, from 1.29 ?m in 4 minutes to 3.98 ?m in 12 minutes because more ions settle on the surface. 
Deteksi Cacat Bantalan Bola Pada Pompa Sentrifugal Menggunakan Spektrum Getaran Berli P Kamiel; Mulyani Mulyani; Sunardi Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i2.3543

Abstract

One of the common fault in the centrifugal pump is faulty bearing. Bearings play a very important role for smooth rotation of a shaft. A bearing condition must be constantly monitored to ensure top performance of a pump. Therefore, a method is needed to detect an early defect in the bearings. One of the most widely used methods for bearing faults detection is based on the vibration analysis. Vibration analysis can detect a defect in a bearing without having to disassemble the machine. Furthermore, and it is fast and easy to be implemented. This study aims to develop a fault detection method on the ball bearing using spectrum analysis by applying envelope analysis. This research uses experimental method with three bearings conditions i.e. normal (no fault), outer race fault, and inner race fault. The type of ball bearings used are self aligning double row bearings. The vibration signal from each of bearing condition is taken from the centrifugal pump vibration test rig and measured using accelerometer sensor which is acquired directly with DAQ and then processed into Matlab. The analysis gives the result of frequency spectrum and envelope spectrum. This study concludes that the high amplitude on the frequency that coincide with the frequency of Ball Pass Frequency Outer Race (BPFO) and Ball Pass Frequency Inner Race (BPFI) make an indication of damage to the bearing on the outer and inner race respectively. The envelope spectrum gives better results as compared to the result of the frequency spectrum. This is because the high amplitude of low frequency generated from other components is blocked and removed using a high-pass filter. Consequently, it becomes easier to detect a low amplitude of high frequency vibration signal from a faulty bearing.
Peningkatan Ketahanan Korosi Pada Material Biomedik Plat Penyambung Tulang SS 304 Dengan Gabungan Metode Shot peening dan Electroplating Ni-Cr Sunardi Sunardi; Priyo Tri Iswanto; Mudjijana Mudjijana
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i2.1817

Abstract

Stainless steel (SS) 304 is widely used as biomedical materials because of its lower cost and its availability. However its corrosion resistance is lower than that of the SS 316L. The purpose of this study is to determine the influence of the combination surface treatment i.e. shot peening treatment and electroplating Ni-Cr on the corrosion resistance in simulated body fluid (SBF) of SS 304 material. The shot peening treatments were carried out using a variable period of 5, 15 and 30 minutes. Diameter steel balls of 0.6 mm with a hardness of 40-50 HRc, was applied. Pressure compressor was maintained in the range of 6 -7 kg / cm2 with nozzle diameter and the distance between nozzle and the specimen of 5 mm and 10 cm respectively. After shot peening process, the specimens were nickel-electroplated using a voltage of 2 V at current of 0.03 A with the distance between the electrode of 4 cm for 15 minutes. After nickel-electroplated process the specimens were chrome-electroplated using a voltage of 4.5 V at current 0.3 A with the distance between the electrode of 15 cm for 5 minutes. The specimen was then tested its corrosion rate in the test medium SBF using Galvanostat M 273 in the range of -20 mV s / d 20 mV. The corrosion test results show that SS 316L and SS 304 without treatment have corrosion rate respectively 1.212 X 10-3 mm / year and 4,003 x 10-3 mm / year. Which means that corrosion rate of SS 304 is 333% higher than SS 316L. The corrosion rate after treatment shot peening 5, 15 and 30 minutes followed by Ni-Cr electroplating is respectively 2.121 x 10-3 mm / year, 0.554 x 10-3 mm / year and 0 mm / year (not detected by the measurement instrument).
Optimalisasi Desain Frame Sepeda Menggunakan Software Autodesk Inventor 2015 Sunardi Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i2.3337

Abstract

Bicycles become one of the environmentally friendly land transportation and are increasingly demanded by wider community. Frame a main component of the bikes that must safely be designed because it is the haviest part compared to the other components. MUSTANG hybrid bikes use steel Hi-Ten (High Tensile Steel) for their frames. The density of such material is relatively high in comparison with other frame materials such as aluminum alloy, carbon fiber, and titanium. Thus, it needs to be redesigned to optimize frames in terms of mass, stress, displacement, and safety factor. This research was first measureing the dimensions of a MUSTANG bike frame. Next, it was drawn, and simulated using Autodesk Inventor Professional 2015 software. Simulation results were then used to optimize the frame design in terms of its mass, stress, strain, displacement and safety factor. The optimized design simulation shows that maximum stress and displacement being 14,75 MPa and 0,01617 mm, respectively. In addition, minimum safety factor and mass being 14,94 and 3,1323 kg, respectively. The optimum bike frame was found at modification frame 5 with maximum stress of 8,40 MPa, maximum displacement of 0,01782 mm, minimum safety factor of 15 and minimum mass of 3,1343 kg. 
Co-Authors Achmad Zamhari Julianto Agung Mulyo Widodo Anggara, Bayu Arif Setyo Nugroho Aris Widyo Nugroho Auliandi Luthfi Wibisono Bambang Riyanta Bayu Anggara Berli P Kamiel Budiyantoro, Cahyo Cahya Darmarjati Diki Irwansyah Fitroh Anugrah Kusuma Yudha Irwansyah, Diki Julianto, Achmad Zamhari Kamiel, Berli Paripurna Karisma Trinanda Putra M. Budi Nur Rahman Mudjijana Mudjijana Mudjijana, Mudjijana Muhammad Budi Nur Rahman Muhammad Budi Nur Rahman, Muhammad Budi Muhammad Nadjib Mulyani Mulyani Mulyani, Mulyani Prayitno Prayitno Priyo Tri Iswanto Thoharudin Thoharudin Totok Suwanda Tri Wahyono Wibisono, Auliandi Luthfi