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ANALISIS KEGAGALAN FIRE RING PENYEBAB KERUSAKAN PISTON MESIN UNIT KENDARAAN BERMOTOR Febriyanti, Eka; Suhadi, Amin
Majalah Ilmiah Pengkajian Industri Vol 10, No 2 (2016): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Fire ring atau oil scraper ring merupakan salah satu komponen penting dari mesin yang berada pada chamber pembakar dan berlokasi di atas piston serta berfungsi untuk membantu dalam kontrol oli sehingga pembakaran berlebih dapat diminimalisir. Hal tersebut disebabkan karena fire ring dapat membiarkan oli untuk lewat sehingga dapat melumasi piston dan cylinder wall. Oleh karena itu, peranan dari fire ring sangat mempengaruhi kinerja dari mesin diesel suatu kendaraan. Apabila fire ring tidak terinstall dengan baik maka menyebabkan fire ring akan gagal setiap saat, hal ini menyebkan mesin dapat rusak pada hitungan detik. Pada penelitian ini fire ring mengalami kerusakan selama overhaul (bongkar mesin). Penelitian dilakukan dengan menggunakan sistem tulang ikan, yaitu meneliti dari berbagai kemungkinan kerusakan sampai ketemu penyebab utamanya. Detail analisis dari permukaan yang rusak menunjukkan bahwa kerusakan fire ring disebabkan oleh beban impak tinggi yang diberikan oleh pemukul piston secara tidak homogen sehingga menghasilkan kelebihan beban pada daerah fire ring tertentu dan akhirnya menghasilkan retak dan patahan. Patahan ini diawali dengan pemindahan kedudukan fire ring yang tidak tepat pada piston.

ANALYSIS OF DENICKELIFICATION PHENOMENON ON HEAT EXCHANGER TUBE Suhadi, Amin; Febriyanti, Eka; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol 12, No 2 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

DeNickelification is common phenomenon which occurs for alloy metal containing sufficient amounts of Nickel when it is exposed at high temperature in long time periode. One of component which is made of alloy metal containing Nickel is heat exchangers tube. Heat exchanger is a part of processing unit that use for transfering heat from hot fluid to colder fluid through the combined mechanisms of conduction and convection. When the heat exchanger leaks, all of the processing system could be affected. In this research a leakage heat exchanger tube is investigated by failure analysis methods to find the root cause of failure. Several tests and examinations such as fractography, metallography examinations, SEM and EDS, hardnes as well as chemical compositions test are carried out to this tube to obtain detailed information for further analysis.Result of this reseach shows that some Cu residue, Ni, aggressive/corrosive ion such as Cl- and S2- at the leak area of heat exchanger tube is found. These evidences indicated that denickelification was occurred on inner surface of heat exchanger tube caused by potential difference between Ni2+ion and Cu2+ ion to form a galvanic cell. Furthermore, since the tube is flown by fluid material which contains aggressive / corrosive ions such as Cl- ion and S2- then pitting corrosion on inner surface of tube is formed. This mechanism had been taken place continuously during operation of heat exchanger and pitting corrosion keep growing until the tube leaks.

ANALISIS KERUSAKAN RADIATOR SEPEDA MOTOR 150CC suhadi, amin
Majalah Ilmiah Pengkajian Industri Vol 11, No 2 (2017): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Sepeda motor yang mempunyai kapasitas mesin relativ besar memerlukan pendingin yang efisien agar ketika beroperasi tidak mengalami panas yang berlebihan sehingga dapat merusak mesin tersebut. Jika sepedamotor dengan kapasitas mesin kecil cukup menggunakan pendingin udara, maka untuk sepeda motor dengan kapasitas mesin besar digunakan pendingin dengan sistim cairan, dan dikenal dengan nama radiator. Jika radiator rusak maka sistim pendinginan tidak berjalan dengan baik sehingga berpotensi terjadi kebakaran pada mesin. Pada penelitian ini di lakukan analisa terhadap kebocoran yang terjadi pada sebuah radiator sepeda motor 150 cc, tujuan penelitian adalah untuk mencari akar penyebab kerusakan dari radiator tersebut agar kerusakan serupa tidak terjadi pada produk sepedamotor yang sejenis. Analisa yang dilakukan meliputi pemeriksaan permukaan patahan dengan cara analisa makro fraktografi, pemeriksaan struktur mikro, pemeriksaan komposisi kimia, pemeriksaan kekerasan dan pemeriksaan SEM (Scanning Electron Microscopy) serta pemeriksaan menggunakan EDS (Energy Dispersive Spectrometer). Hasil penelitian menunjukkan bahwa retak dan patahnya penopang radiator disebabkan adanya beban dinamis atau getaran yang terjadi pada konstruksi tersebut dan dipikul oleh pelat penopang radiator. Bukti dari hasil pemeriksaan menunjukkan bahwa karet yang berfungsi sebagai peredam getaran radiator pada posisi atas telah aus dan kendur sehingga fungsi peredaman tidak optimum lagi, sehingga pelat penopang radiator retak dan retaknya merambat ke kisi kisi yang berisi cairan pendingin dan mengakibatkan kebocoran.

FATIGUE AND CORROSION PHENOMENON ON FAILURE OF WATER WALL TUBE BOILER Febriyanti, Eka; Suhadi, Amin; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol 14, No 1 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Water wall tube is one of a boiler components which has a function to transform water to be vapour so that it is normally called steam generating tubes. Any failure on wall tube will affect to the whole boiler system. The purpose of this research is to find out root cause of failure of wall tube in order to avoid similar case in the future. Research is conducted by examining and testing the specimens on all aspects including visual, fractography, metallography, chemical analysis, hardness test and tensile test. Examination on the fracture surface by fractographic method found the evidence of fatigue fracture with the presence of beachmark. Another examination on uninstalled boiler tube shows indication of fabrication defect and trans-granular cracks which allowed corrosive agent infiltrated into the microstructure of the tube. However, the result of chemical analysis and tensile test indicated that the tubes investigated are in accordance with ASTM A 210 Grade C specifications. Therefore, the failure of the tube is not caused by wrong material selection, but through the combination of fatigue fracture and corrosion attack where initiated at fabrication defect that acted as stress raisers.

ANALISIS MAMPU BENTUK BAHAN BAKU SELONGSONG MUNISI CU-ZN 70/30 SETELAH DEFORMASI PADA SUHU 500ÂºC = ANALYSIS FORMABILITY OF RAW MATERIALS CU - ZN MUNITIONS CASINGS 70/30 AFTER DEFORMATION AT TEMPERATURE 500ÂºC Febriyanti, Eka; Suhadi, Amin; Priadi, Dedi; Riastuti, Rini
Majalah Ilmiah Pengkajian Industri Vol 9, No 3 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

casing because both processes have important role to derive raw material into the required form, dimensions and characteristics. Cu-Zn 70/30 alloy is raw material which normally used as munition casing however, its formability after deformation and heat treatment is not widely known. Therefore, this research has an objective to study the effect of deformation at warm temperature on cold formability by introducing thermomechanical controlled processed in warm rolling. Warm rolling have been conducted by double pass reversible method on 25% x 2, 30% x 2, and 35% x 2 at temperature 500oC. Evaluation of formability have been done by limited tensile test up to 20% elongation and full tensile test until rupture. The result of this research indicates that the best formability of Cu-Zn 70/30 is obtained on specimen which are deformed by warm rolling at actual degree of deformation 38.7%. Formability testing result for his specimen under designated warm rolling parameter has an elongation 10 % with strain hardening coefficient 0.00228, average normal anisotropy value 0.5452, and plannar anisotropy value ?r 1 is: -0.42. ABSTRAKDeformasi dan perlakuan panas selalu menyertai proses pembuatan selongsong peluru karena kedua proses tersebutlah yang mampu mengatur bahan baku menjadi bentuk dan dimensi yang diinginkan serta sesuai dengan karakteristik yang dikehendaki. Padaun Cu-Zn 70/30 adalah bahan baku yang digunakan untuk pembuatan selongsong peluru, namun mampu bentuk paduan ini akibat deformasi dan perlakuan panas belum banyak diketahui. Oleh karena itu pada penelitian ini bertujuan untuk mempelajari pengaruh deformasi yang dilakukan pada suhu hangat terhadap mampu bentuk dingin dengan metode thermomechanical controlled processed menggunakan teknologi canai hangat. Teknologi canai hangat dilakukan dengan metode double pass reversible sebanyak 25% x 2, 30% x 2, dan 35% x 2 pada suhu 500oC. Pengamatan mampu bentuk dilakukan dengan pengujian tarik hanya sampai perpanjangan 20% serta uji tarik sampai putus. Hasil dari penelitian menunjukkan bahwa sifat mampu bentuk terbaik diperoleh pada benda uji yang dideformasi canai hangat di temperatur 500oC dengan derajat deformasi aktual sebesar 38.7%. Apabila dilihat dari sifat mampu bentuknya maka benda uji yang dideformasi canai hangat pada kondisi parameter penelitian ini memiliki nilai elongasi sebesar 10 % dengan nilai koefisien pengerasan regang yang tinggi sebesar 0.00228, nilai anisotropi normal rata-rata sebesar 0.5452, dan nilai anisotropi planar yaitu ?r 1 sebesar -0.42.

Analisa Gaya Penekanan pada Proses ECAP Batang Kuningan CuZn 70/30 -, Suryadi; Suhadi, Amin; Priadi, Dedi; Siradj, E. S.
Majalah Ilmiah Pengkajian Industri Vol. 8 No. 1 (2014): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Telah dilakukan percobaanÃ‚Â severe plastic deformationÃ‚Â (SPD) dengan metodeequal channel angular pressingÃ‚Â (ECAP) pada batang kuningan CuZn 70/30 diameter 10 mm sampai 5 pas. Gaya penekanan meningkat secara signifikan pada awal langkah penekanan dan mencapai nilai maksimum lalu melandai. Pada pas pertama gaya penekanan mencapai 115 kN, pas kedua 130 kN, pas ketiga mecapai 150 kN dan pada pas keempat 165 kN. Dari pengukuran luas area di bawah kurva gaya penekanan diperoleh energi total pembentukan pada proses ECAP batang kuningan persatuan panjang adalah 95 Joule/mm pada pas pertama, sampai 130 Joule/mm pada pas ketiga, dan turun 125 Juole/mm pada pas keempat. Secara kumulatif total energi persatuan panjang meningkat secara linier sesuai dengan peningkatan jumpah pas, dimana pada pas keempat mencapai 597 MPa. Peningkatan gaya penekanan dan energi penekanan sebanding dengan terjadinya peningkatan kekerasan pada batang kuningan dan terjadinya penghalusan butir.Kata kunci:Ã‚Â ECAP, gaya penekanan, energi pembentukan, kekerasan, penghalusan butir, kuningan.AbstractExperiments of severe plastic deformation (SPD) have been carried out by the method of equal channel angular pressing (ECAP) on brass rods CuZn 70/30 diameter 10 mm to 5 pas. Pressing force significantly is increased emphasis on early steps and reaches a maximum value and then ramp. At the first pas the pressing force reached 115 kN, the second pass 130 kN, the third pass 150 kN and fouth pass is 165. From measurements of the area under the curve of pressing force, the total forming energy per unit length generated to form the brass rod in ECAP is 95 Joule / mm at the first pass, 130 Joules / mm at third pass and down to 125 Joule/mm at fouth pass. Cumulatively, the total forming energy per unit length increases linearly according to the increase in number of ECAP pass, where the fourth pass reach 597 Joule/mm. Increased emphasis pressing load and forming energy is proportional to the increase in hardness of the brass rod and the grain refinement.Keywords:Ã‚Â ECAP, pressing load, forming energy, hardness, grain refinement, Brass

IMPLEMENTATION OF ROOT CAUSE ANALYSIS METHOD TO INVESTIGATE FAILURE OF FRONT WALL TUBE BOILER Febriyanti, Eka; Suhadi, Amin; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol. 14 No. 3 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v14i3.4104

Root cause analysis is a method that observes all of the possible causes that make the system or components fail. This research is implemented such a method to investigate the failed front wall tube on the boiler. The purpose of this research is to find out the main cause of failure on the front wall tube to avoid a similar problem in the future. Â Considering all aspects that have the potential to be the main cause of failure, therefore, many tests and examinations are done, including visual tests, fractography, metallography, chemical analysis, hardness test, SEM, and EDS analysis. Â Examination result on the fracture surface shows two bulges on a tube and some longitudinal cracks spread on bulges outside the surface area. At the same time, the thick scale is also found on the inside surface of these bulges. Moreover, microstructure and hardness changes are also found in this area. Â From the analysis of all test result that obtained it is concluded that the main cause of failure is the presence of scales which reduce heat transfer so that local overheating occurred.Â Consequently, its tensile strength in this area is decreased, and finally, the tube could not support operational pressure and deformed to make a bulge. Â Â Â Â Keywords: Root cause; Failure; Front wall; Tube; Boiler

THE EFFECT OF ABRASIVE GRAIN SHAPES ON QUALITY OF FERRITE MAGNETS GRINDING PROCESS Saputro, Bayu Rahmat; suhadi, amin
Majalah Ilmiah Pengkajian Industri Vol. 14 No. 2 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v14i2.4170

AbstractÃ‚Â A research was conducted on the grinding process of ferrite magnet with Strontium ferrite type (SrO.6 (Fe2O3)) using electroplated single layer grinding wheels. Many cracks have been found on work pieces during this work, which is coming from grinding processes. Research is conducted starting from chemical composition test and the effect of the shape and size of the abrasive grain of grinding wheels to the quality of grinding process results by measuring crack ratio of the work piece.Ã‚Â In this experiment, 3 (three) model design of grinding wheels with three different size and shape of abrasive grains are made. All of processing parameters are set at the same value as ordinary process.Ã‚Â The experimental results shown that 3rd model have the best results from the outputs number and also the lowest reject crack ratio compared to 1st and 2nd models. This is because the 3rd model has blocky shape which its distribution structure is denser and more uniform compared to the irregular shape, so that continuous grinding on hard and brittle work pieces is more stable and suitable

Optimasi Proses Expanded Foam Injection Molding Material Eva Foam Untuk Peningkatan Kualitas Produk Sudrajat, Nugroho Faris; Suhadi, Amin
Journal Scientific of Mandalika (JSM) e-ISSN 2745-5955 | p-ISSN 2809-0543 Vol. 6 No. 7 (2025)
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/10.36312/vol6iss7pp1998-2003

This study aims to optimize the cooling process in Expanded Foam Injection Molding (EFIM) in order to improve the dimensional consistency of EVA foam products. EVA foam, which is widely used in the footwear industry, especially sneakers, is produced through a foaming process in which blowing agents and curing agents are mixed into the EVA polymer. Variations in the cooling process cause significant differences in product size (dimensions), thereby increasing the reject ratio and affecting the final product quality. Using the Taguchi design experiment approach, this study identifies key parameters in the cooling process, such as temperature, time, and cooling rate, and analyzes their effects on product dimensions. The results show that the application of optimal cooling conditions can reduce the reject ratio and produce products with more consistent dimensions. This study contributes to the manufacturing industry.

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