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Budiyantoro, Cahyo
Universitas Muhammadiyah Yogyakarta
Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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 1 
Optimalisasi Sink Mark Index Pada Produk Plastik Dengan Variasi Ketebalan Ekstrim Menggunakan Simulasi Moldflow Budiyantoro, Cahyo
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Injection Molding Process is a closed cycle process involving 4 important factors that influencing product quality such as: process setting parameter, plastic material selection, product design and mold design. Ideally a plastic product is designed with uniform wall thickness since the thickness variation brought about negative effect on the final product. Those negative effects are warpage, sink mark or voids. Warpage is a bending failure of product, void cannot be observed as unfilled or holes on the cross section of the part, whereas sink mark is a deflected mark that can directly be seen on the surface of the part. Those 3 failures are normally caused by material accumulation and thermal rate differentiation. This research was a computerized based simulation using Autodesk MoldFlow Plastic Insight software to predict the 3 failures and to optimize the product quality by Sink Mark Index reduction, minimizing sink mark estimation and volumetric shrinkage  due to extreem thickness variation. The selected specimen was a brush handle, a real product that can easily be found in the market. The errors of brush handle in fact was caused by poor design and the only way to improve its quality is from process parameters point of view. There are 5 possible factors in fixing the failures, each factor possessed 3 level of values, then according to the Taguchi approach of design experiment, there must be 27 experiments to be done. After having 27 times experiments with combination of level and factors, it can be summerized that by combining low melting temperature, high injection pressure and high holding pressure, a sink mark index of 2.642% and a volumetric shrinkage of 19.28% can be obtained, and those were the minimum values representing the best results of product. The extension of holding time did not give a significant influence on the target quality.
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. 
PENGARUH KECEPATAN PUTAR TOOL DAN SUDUT SHOULDER SAMBUNGAN FRICTION STIR SPOT WELDING PADA BAHAN POLYPROPYLENE Nugroho, Aris Widyo; Dwi Saputra, Muhammad Rifai; Budiyantoro, Cahyo
Semesta Teknika Vol 22, No 2 (2019): NOVEMBER 2019
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.222250

Abstract

Penyambungan bahan thermoplastic polypropilen dengan teknik Friction stir spot welding (FSSW) telah banyak dilakukan. Walaupun kekuatannya sudah mencukupi, masih dihasilkan keyhole dan bekas shoulder yang cukup besar karena penggunaan ukuran soulder dan pin besar. Penelitian ini menginvestigasi sambungan polypropilen dengan teknik FSSW menggunakan shoulder dan pin lebih kecil pada geometri shoulder yang berbeda. Penelitian di awali dengan pemotongan lembaran polypropylene dengan panjang 150mm, lebar 30mm dan tebal 5mm. Sambungan tumpang sesuai dengan standar EN 12814-2 digunakan dalam penyambungan ini. Proses penyambungan dilakukan pada kecepatan putar 985, 1660, 2350 rpm dengan dua jenis tool (shoulder angle 0o dan 5o). Sambungan diamati struktur makro, kekerasan dan kapastas beban tariknya. Hasil penelitian menunjukan bahwa semua sambungan memiliki kegagalan getas. Seiring bertambahnya sudut shoulder dan kecepatan putar tool, ukuran nugget dan welding zone meningkat, sehingga meningkatkan kapasitas beban tari mencapai 2116 N. Geometri tool 2 berpotensi untuk dapat diaplikasikan dalam sambungan FSSW. The joining of thermoplastic polypropylene material using the Friction stir spot welding (FSSW) technique has been developed. Although the strength is sufficient, it still produces a large keyhole and shoulder marks due to the use of a large shoulder and pin size. This research investigates polypropylene joint with the FSSW technique using smaller shoulders and pins on different shoulder geometries. The research began by cutting of polypropylene sheets into 150 mm long and 30 mm wide and 5 mm thick. Specimens according to EN 12814-2 were used in this welding joint. The welding process is carried out at rotational speeds of 985, 1660, 2350 rpm with two types of tools (shoulder angle of 0o and 5o). The welding joint was then observed for macrostructure, hardness, and tensile load-bearing capacity. The results showed that all welding joints had a brittle failure. The increasing of the shoulder angle and the rotational speed increase the nugget size and welding zone thickness resulting in a higher tensile load-bearing capacity which reaches up to 2116 N. The tool with the geometric being used has the potential to be applied in the FSSW joint.
Pengaruh Kecepatan Putar Tool dan Sudut Shoulder Sambungan Friction Stir Spot Welding pada Bahan Polypropylene Nugroho, Aris Widyo; Dwi Saputra, Muhammad Rifai; Budiyantoro, Cahyo
Semesta Teknika Vol 22, No 2 (2019): NOVEMBER 2019
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.222250

Abstract

Penyambungan bahan thermoplastic polypropilen dengan teknik Friction stir spot welding (FSSW) telah banyak dilakukan. Walaupun kekuatannya sudah mencukupi, masih dihasilkan keyhole dan bekas shoulder yang cukup besar karena penggunaan ukuran soulder dan pin besar. Penelitian ini menginvestigasi sambungan polypropilen dengan teknik FSSW menggunakan shoulder dan pin lebih kecil pada geometri shoulder yang berbeda. Penelitian di awali dengan pemotongan lembaran polypropylene dengan panjang 150mm, lebar 30mm dan tebal 5mm. Sambungan tumpang sesuai dengan standar EN 12814-2 digunakan dalam penyambungan ini. Proses penyambungan dilakukan pada kecepatan putar 985, 1660, 2350 rpm dengan dua jenis tool (shoulder angle 0o dan 5o). Sambungan diamati struktur makro, kekerasan dan kapastas beban tariknya. Hasil penelitian menunjukan bahwa semua sambungan memiliki kegagalan getas. Seiring bertambahnya sudut shoulder dan kecepatan putar tool, ukuran nugget dan welding zone meningkat, sehingga meningkatkan kapasitas beban tari mencapai 2116 N. Geometri tool 2 berpotensi untuk dapat diaplikasikan dalam sambungan FSSW. The joining of thermoplastic polypropylene material using the Friction stir spot welding (FSSW) technique has been developed. Although the strength is sufficient, it still produces a large keyhole and shoulder marks due to the use of a large shoulder and pin size. This research investigates polypropylene joint with the FSSW technique using smaller shoulders and pins on different shoulder geometries. The research began by cutting of polypropylene sheets into 150 mm long and 30 mm wide and 5 mm thick. Specimens according to EN 12814-2 were used in this welding joint. The welding process is carried out at rotational speeds of 985, 1660, 2350 rpm with two types of tools (shoulder angle of 0o and 5o). The welding joint was then observed for macrostructure, hardness, and tensile load-bearing capacity. The results showed that all welding joints had a brittle failure. The increasing of the shoulder angle and the rotational speed increase the nugget size and welding zone thickness resulting in a higher tensile load-bearing capacity which reaches up to 2116 N. The tool with the geometric being used has the potential to be applied in the FSSW joint.
Optimalisasi Sink Mark Index Pada Produk Plastik Dengan Variasi Ketebalan Ekstrim Menggunakan Simulasi Moldflow Cahyo Budiyantoro
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2316

Abstract

Injection Molding Process is a closed cycle process involving 4 important factors that influencing product quality such as: process setting parameter, plastic material selection, product design and mold design. Ideally a plastic product is designed with uniform wall thickness since the thickness variation brought about negative effect on the final product. Those negative effects are warpage, sink mark or voids. Warpage is a bending failure of product, void cannot be observed as unfilled or holes on the cross section of the part, whereas sink mark is a deflected mark that can directly be seen on the surface of the part. Those 3 failures are normally caused by material accumulation and thermal rate differentiation. This research was a computerized based simulation using Autodesk MoldFlow Plastic Insight software to predict the 3 failures and to optimize the product quality by Sink Mark Index reduction, minimizing sink mark estimation and volumetric shrinkage  due to extreem thickness variation. The selected specimen was a brush handle, a real product that can easily be found in the market. The errors of brush handle in fact was caused by poor design and the only way to improve its quality is from process parameters point of view. There are 5 possible factors in fixing the failures, each factor possessed 3 level of values, then according to the Taguchi approach of design experiment, there must be 27 experiments to be done. After having 27 times experiments with combination of level and factors, it can be summerized that by combining low melting temperature, high injection pressure and high holding pressure, a sink mark index of 2.642% and a volumetric shrinkage of 19.28% can be obtained, and those were the minimum values representing the best results of product. The extension of holding time did not give a significant influence on the target quality.
Pengaruh Waktu dan Suhu Proses Elektrolessplating Nikel terhadap Karakteristik Fisik dan Mekanik Plastik ABS Muhammad Budi Nur Rahman; Cahyo Budiyantoro; Sunardi Sunardi
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Universitas Muhammadiyah Yogyakarta

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 μm 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 μm 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 μm dalam waktu 4 menit menjadi 3,98 μm 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 μm 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 μm because more and more ions are formed but at a temperature of 60oC and 70oC the thickness decreases by 4.57 μm and 3.72 μm. The addition of electroless-plating process time increases the thickness of the layer, from 1.29 μm in 4 minutes to 3.98 μm in 12 minutes because more ions settle on the surface. 
The Influence of Fiber Treatment and Matrix Type on the Impregnation Quality of Carbon Fiber Reinforced Thermoplastics Budiyantoro, Cahyo; Sosiati, Harini; Syahputra, Kevin Atila; Sudarisman, Sudarisman
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.18597

Abstract

One of the main issues with Carbon Fiber Reinforced Thermoplastics (CFRTP) is the poor impregnation quality of the matrix on carbon fiber due to the high viscosity of the thermoplastic. Impregnation quality can significantly affect the mechanical properties of the composite. This study aims to compare the impregnation abilities of various types of thermoplastic matrices on carbon fiber. The matrices used in this study are HDPE, PC, and PET. Three variations of carbon fiber treatment were employed: the first variation involved immersion in liquid nitrogen at -196°C, the second variation included heating in an electric furnace at 600°C followed by rapid cooling in liquid nitrogen, and the third variation utilized treatment with a silane coupling agent. The research findings demonstrate that composites comprising a Polycarbonate matrix and carbon fiber reinforcement, treated with a silane coupling agent, exhibit superior impregnation quality, as evidenced by an Interfacial Shear Strength (IFSS) value of 9.34 MPa.. The lowest impregnation quality was observed in HDPE reinforced with carbon fiber that had been heated and rapidly cooled, with an IFSS of 5.52 MPa.
Co-Authors Adam, Muhammad Kevin Adhi Setya Hutama Adi Nugroho Agustina, Nurhaliza Ali Khaerul Mufid Anggariawan, Arista Anggariawan, Arista Anwar, M. Choirul Aris Widyo Nugroho As’ari, Muhammad Agung Atikasari, Tiara Cahya Attoriq, Fajri Bayu Prabandono Bilyferdin, Bastian Cahyo Trisedyo Utomo Chusnul Azhar Dede Tohidin Diki Irwansyah Dwi Saputra, Muhammad Rifai Dwi Saputra, Muhammad Rifai Eduar Iqbal Riza Fawwas Ghazy, Muhammad Ikbar Ferriawan Yudhanto, Ferriawan Fitri Wahyuni Fitri Wahyuni Fitroh Anugrah Kusuma Yudha Gesang Nugroho Ghanim Raihan Ghozali, Mohamad Yuzdhie Ghozali Ghozali, Mohamad Yuzdhie Ghozali Harahap, Yudani Alamsyah Herda Agus Pamasaria Hidayat, Muhammad Firdaus Ikhsan, Subkhan Nur Irawan, Fabio Dwi Bagus Irawan, Fabio Dwi Bagus Irmawan, wiwin Irwansyah, Diki Iwan Setiono J. Wawan Joharwan khadliq, muhammad M. Choirul Anwar M. Puji Ibnu Mimbar Maulana Maemunah Maemunah Maulana, M. Puji Ibnu Mimbar Mufid, Ali Khaerul Muhammad Agung As’ari Muhammad Budi Nur Rahman Muhammad Budi Nur Rahman Muhammad Budi Nur Rahman, Muhammad Budi muhammad khadliq Ni'am, Lutfi Khoirul Miftakhul Nurhadi, Taufik Nurhaliza Agustina Pamasaria, Herda Agus Permana, Cepi Rahmatullah Permana, Cepi Rahmatullah Perwita Kurniawan Pradana, Benanta Ogi Pratama, Wahyu Aji Rahman, Muhammad Budi Nur Raihan, Ghanim Riza, Eduar Iqbal Sahputra, Wahyu Puji Sosiati, Harini Subkhan Nur Ikhsan Sukamta Sukamta Sukamta Sukamta Sunardi Sunardi Sunardi, Sunardi Syahputra, Kevin Atila Taufik Nurhadi TH Adi Nugroho Thoharudin Thoharudin Thoharudin, Thoharudin Tiara Cahya Atikasari Totok Suwanda Tri Hannanto Saputra Tri Wahyono Widyasmoro, Widyasmoro wiwin Irmawan Yudani Alamsyah Harahap