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All Journal Jurnal Sains Materi Indonesia Metal Indonesia Mesin Molekul: Jurnal Ilmiah Kimia Jurnal Metalurgi dan Material Indonesia Jurnal Ilmu dan Inovasi Fisika Metalurgi
Ramelan, Aditianto
Material Science And Engineering Research Group, Faculty Of Mechanical And Aerospace Engineering, Institut Teknologi Bandung
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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KAJI EKSPERIMENTAL DAN NUMERIK TENTAN G FAKTOR KETANGGUHAN RETAK MODUS I DAN II PADA LAMINATE KARBON/EPOXY SERAT TERANYAM Puja, IGN Wiratmaja; Suratman, Rochim; Ramelan, Aditianto; Prasetia, Hariadi Tri
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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Abstract

This paper presents experimental and numerical analysis on the influence of crack orientations to the fracture toughness of mode I and mode II for woven type carbon/epoxy four ply laminate. The experimental procedure is carried out through off axis tensile test (ASTM D 3039-76) with nine variation of crack orientations i.e. 5°, 10°, 15°, 30°, 45° 65°, 75°, 80°, and 90°. Three rail shear test (ASTM D 4255-83) is utilized for zero degree crack orientation. The stress and strain contours around crack tips are obtained numerically using the finite element method. Numerical and experimental results of the mode I (KI) and mode II (KII) fracture thoughness are presented in graphical form as a function of crack directions. Adopting Wu’s(11) Criteria for unidirectional lamina and Hahn’s[6] Criteria for general anisotropic lamina, a new mixed mode fracture toughness criteria is developed for woven fiber matrix laminate.
Pengaruh Penambahan Silica Fume, Rasio Air-Semen, dan Rasio Semen-Agregat Terhadap Kekuatan Tekan Beton Aditianto Ramelan; F.N. Sutandi; T. Indriati; A.S. Nugroho; A. Rozaq; R. Rachmantyo
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 1 (2018): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Concrete is a popular building structures because it is relatively cheap, has a good strength, durable, and has easy raw materials. Therefore, various researches have been done to improve the quality of concrete, such as using mineral admixtures like silica fume and variations of aggregate. This research is done by making concrete sample for compressive strength test. The variations are the addition of silica fume (SF) with the composition of 10, 15, and 20% of mass of concrete, the ratio of water-cement (w/c), and the cement-aggregate ratio (c/a) with the composition of 0.6; 0.8; and 0.9 for 28 day test age. The aggregate used is silica sand. From the test results, the maximum compressive strength is 33.73 MPa from the sample with the composition of w/c = 0.4; SF = 15%, and c/ a = 0.9 which is higher than cement sample that has 20.85 MPa. Its compounds, which are identified with the XRD characterization, are Calcite, Quartz, Calcium Silicate Hydrate (CSH), Calcium Silicate, and Portlandite. There is also cement sample with silica fume (w/c = 0.4; SF = 10%) that has a compressive strength of 24.26 MPa. The compounds identified are Calcite, CSH, Calcium Silicate, Ettringite, and Portlandite. Addition of silica fume on cement can increase its compressive strength due to the occurrence of pozzolanic reaction. This is evidenced by the increase of CSH compounds and reduction of Portlandite compounds on the results of XRD characterization. The use of silica sand in the mix will increase concrete’s compressive strength because silica sand itself has greater compressive strength than the others.
Pengaruh Temperatur dan Rapat Arus Terhadap Kekerasan dan Distorsi Kisi pada Hard Chromium Plating pada Baja Karbon Rendah Riska Rachmantyo; Aditianto Ramelan; Akhmad Zein Eko Mustofa; Asep Ridwan Setiawan
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Hard Chromium Plating is one of several coating techniques that has been applied to engineering components. The hard chromium layers have several properties such as, hardness, high corrosion and wear resistance. In fact the quality is determined by several process parameters during electro deposition. In this experiment temperature and current density were varied to observe the effect on the quality of hard chromium layer deposited on a steel base plate. This was to find the appropriate combination of producing deposited layer with the optimum quality. The electroplating process was carried out for 60 minutes at 50, 55 and 60 oC with current density variation of 70, 80 and 90 A/dm2. The specimen were then undergone hardness test and XRD characterization. Maximum hardness measured was 1128 HV this was plated at 55°C with a current density of 80 A/dm2. XRD analysis shown that the increasing hardness of hard chromium plating is related with an increase of microstrain calculated from the diffractogram pattern.
Komposit Grafit-Polistirena Diperkuat Poliuretan sebagai Penyerap Gelombang Akustik : Fabrication of Polyurethane Composite Foam with Graphite-Polystyrene Filler for Improved Sound Absorption Adhi Satriyatama; Haris Amaldi; M. Maulana Ibrahim; Aditianto Ramelan
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Noise, harshness, and vibration (NHV) are problems encountered when driving a vehicle. This can cause serious problems for drivers if exposed to NHV for a long time. In order to avoid the NHV, vehicle are equipped with acoustic tile which functions to absorb vibration from the sound wave and reduce the noise caused by the vehicle’s engine. Polyurethane foam is commonly used as a sound absorption material because of its high sound absorption efficiency. The study aimed at investigating polystyrene (PS) and graphite (G) fillers with polyurethane matrix for improving acoustic property. The research started with optimization of composite that characterized using sound absorption intensity parameters at frequencies of 50 Hz-6000 Hz, and the optimum results obtained at matrix/filler 92.8%wt. The composite morphology is analyzed using SEM-EDX, optical microscopy, and the density. Mechanical test is conducted using Universal Testing Machine (UTM) and achieved the optimum compressive strength at 60G/40PS with 0.65 MPa. The absorption of acoustic waves property was tested in the frequency range 50 Hz-6300 Hz using an impedance tube and obtained the optimum composition at 0G/100PS.
Komposit Aluminium 1100 ‐ Nano Alumina Metode Dispersi Mekanik Screen Printing dan Ultrasonic Fogger Accumulated Roll Bonding: Aluminum 1100 - Nano Alumina Composite with Mechanical Screen Printing and Ultrasonic Fogger Dispersion Method on Accumulated Roll Bonding Process Riska Rachmantyo; Aditianto Ramelan; Firmansyah Sasmita
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Aluminum material that is commonly used in life. This material is lightweight, corrosion resistant, tough and good working process. However, strength and hardness are lower than other metals such as steel. Processing needs to be done to get better aluminum mechanical properties. In this study, making a metal matrix composite in which aluminum 1100 as a substrate and 10 nm nano alumina (Al2O3) powder as a reinforcement. The process of making composites uses the method of accumulated roll bonding. The distribution of alumina powder on the aluminum matrix greatly influences the mechanical properties produced, namely its strength and hardness. The distribution process of nano alumina is carried out using screen printing, spray and ultrasonic spray methods. Besides the distribution method, the amount of alumina is also used as a research parameter. Improved optimum mechanical properties were obtained from the ultrasonic spray spray distribution method with the addition of 5 w/0 alumina.
PENENTUAN KANDUNGAN ASBES PADA MATERIAL GASKET MENGGUNAKAN TEKNIK PETROGRAFI SAYATAN TIPIS DAN DIFRAKSI SINAR-X Firmansyah Sasmita; Aditianto Ramelan; Nurcahyo Indro Basuki
Jurnal Sains Materi Indonesia Vol 19, No 1: OKTOBER 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.19.1.4126

Abstract

Gasket digunakan sebagai penyumbat statis antara dua komponen stasioner, dalam hal ini flens, dari asembli mekanik yang di dalamnya berisi fluida tertentu. Sebelum regulasi tentang pemakaian asbes diperketat, material gasket umumnya mengandung asbes karena keunikan sifatnya, yaitu tahan panas atau api, insulasi listrik, dan relatif terjangkau biayanya. Regulasi dari Occupational Safety and Health Administration (OSHA) 29 CFR 1910.1001 menjelaskan bahwa Asbestos Containing Material (ACM) ialah material apapun yang mengandung asbes lebih dari satu persen. Penentuan kandungan asbes pada material penyusun gasket perlu dilakukan mengingat produk-produk tersebut diperiode lampau diduga mengandung asbes lebih dari ambang batas yang dipersyaratkan. Teknik karakterisasi untuk mendeteksi keberadaan asbes tidak banyak dan relatif rumit begitu juga dengan aspek praktisnya. Teknik Petrografi Sayatan Tipis (PST) dan Difraksi Sinar-X (XRD) dipilih karena relatif mudah dan praktis meskipun masih terdapat kekurangan di dalamnya. Sebanyak tiga sampel gasket dan satu sampel sebagai pembanding telah dianalisis dengan menggunakan teknik karakterisasi PST dan XRD. Hasil analisis menunjukkan bahwa satu dari tiga sampel positif mengandung asbes lebih dari 1% berat bertipe mineral serpentin, yaitu ortokrisotil, berdasarkan karakteristik morfologi hasil pengamatan PST dan pola puncak XRD. Hasil karakteristik dari analisis tersebut mirip dengan sampel pembanding yang mengandung asbes dengan tipe mineral serpentin, yaitu klinokrisotil.
KAJI EKSPERIMENTAL DAN NUMERIK TENTAN G FAKTOR KETANGGUHAN RETAK MODUS I DAN II PADA LAMINATE KARBON/EPOXY SERAT TERANYAM IGN Wiratmaja Puja; Rochim Suratman; Aditianto Ramelan; Hariadi Tri Prasetia
Mesin Vol. 15 No. 3 (2000)
Publisher : Mesin

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

Abstract

This paper presents experimental and numerical analysis on the influence of crack orientations to the fracture toughness of mode I and mode II for woven type carbon/epoxy four ply laminate. The experimental procedure is carried out through off axis tensile test (ASTM D 3039-76) with nine variation of crack orientations i.e. 5°, 10°, 15°, 30°, 45° 65°, 75°, 80°, and 90°. Three rail shear test (ASTM D 4255-83) is utilized for zero degree crack orientation. The stress and strain contours around crack tips are obtained numerically using the finite element method. Numerical and experimental results of the mode I (KI) and mode II (KII) fracture thoughness are presented in graphical form as a function of crack directions. Adopting Wu's(11) Criteria for unidirectional lamina and Hahn's[6] Criteria for general anisotropic lamina, a new mixed mode fracture toughness criteria is developed for woven fiber matrix laminate.
Pengaruh Faktor dan Mekanisme Pengerasan Regangan pada Baja Hadfield Haris Wahyudi; Tatacipta Dirgantara; Rochim Suratman; Aditianto Ramelan
Mesin Vol. 27 No. 2 (2018)
Publisher : Mesin

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Abstract

Abstract. Hadfield steel has good toughness, ductility, impact resistance, wear resistance and has excellent work hardening. It has a carbon content of 1-1.4% and manganese 11-14% by weight, a ratio of approximately 1:10. The potential for increasing its strength against strain hardening can be seen from the wide range of plastic strength, 379 MPa yield strength and 965 MPa tensile strength. The hardening of Hadfield steel strain depends on the type loading which affect the dislocation slip mechanism, twinning deformation, and the interaction between slip and twinning. The study of high strain rates in Hadfield steel is quite interesting and still relevant to date, although there have been many papers published. Hadfield cast steel which has a relatively low hardness, can be increased its hardness by treatment and high work hardening (high strain rate). There are factors that influence the hardness of Hadfield steel include alloying, solid solution process and high work hardening. Nitrogen as austenite stabilizer is important for work hardening, chromium and vanadium are added to increase hardness because it will form carbides, and aluminum is added to increase wear resistance. High strain rate deformation is applied to provide improved strength because of propensity of twinning mechanism is likely to occur. Optimum strain hardening by twinning mechanism can only be achieved at critical impact energy. Explosive hardening generates small deformations but provides significant changes in mechanical properties.Abstrak. Baja Hadfield memiliki sifat ketangguhan, keuletan, ketahanan impak, ketahanan terhadap aus dan memiliki work hardening yang sangat baik. Memiliki kandungan unsur karbon 1-1,4% dan mangan 11-14% berat, rasio kurang lebih 1:10. Potensi peningkatan kekuatan terhadap pengerasan regangan, dapat dilihat dari rentang kekuatan plastis yang lebar, kekuatan luluh 379 MPa dan kekuatan tarik 965 MPa. Pengerasan regangan baja Hadfield tergantung kepada proses pembebanan melalui mekanisme slip dislokasi, deformasi twinning, serta interaksi antara slip dan twinning. Kajian tentang high strain rate pada baja Hadfield menjadi topik yang cukup menarik dan relevan, meskipun telah banyak publikasi yang dihasilkan. Baja Hadfield yang memiliki kekerasan relatif rendah, mampu ditingkatkan nilai kekerasannya melalui rekayasa perlakuan panas dan deformasi plastis secara cepat. Beberapa faktor yang mempengaruhi kekerasan baja Hadfield antara lain bahan paduan, perlakuan panas dan proses pengerasan regangan yang diberikan. Nitrogen sebagai penstabil austenit penting untuk pengerjaan dingin, kromium dan vanadium ditambahkan untuk meningkatkan kekerasan karena akan membentuk karbida, dan aluminum ditambahkan untuk meningkatkan ketahanan aus. Deformasi kecepatan regangan tinggi pada Hadfield memberikan peningkatan kekuatan lebih baik karena mekanisme twinning lebih dominan. Pengerasan regangan optimum oleh mekanisme twinning hanya dapat dicapai pada energi impak kritikal. Explosive hardening menghasilkan deformasi yang relatif kecil tetapi memberikan perubahan sifat mekanik yang signifikan.
Preparation of Polycrystalline Silicon from Rice Husk by Thermal Decomposition and Aluminothermic Reduction Ahmad Nuruddin; Brian Yuliarto; Adhitya Gandaryus Saputro; Badruzaman Badruzaman; Aditianto Ramelan
Molekul Vol 15, No 1 (2020)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.989 KB) | DOI: 10.20884/1.jm.2020.15.1.568

Abstract

Polycrystalline silicon was extracted from rice husk by thermal decomposition and aluminothermic methods. Rice husk was thermally decomposed under various heat treatments and acid purifications. High purity silica of 99.81% was obtained by subsequent rice husk washing, pressure cooking in mixed chloride acid peroxide solution, and burning at 500oC for one hour. Aluminothermic reduction of silica was conducted at various calcination temperatures. It is found that 78.6% of silica was converted to silicon for calcination temperature of 800oC. Leaching the reduction product with strong hydrochloric and hydrofluoric acids produced silicon polycrystalline with a purity of 99.91%.
Surfaces Casting Defect Analysis and its Countermeasures on Products Manufactured by Alkali-Phenolic Binder Sand Molding Husen Taufiq; Aditianto Ramelan; Ekavianty Prajatelistia; Susana Susana; Muhammad Fathurrohman
Jurnal Metal Indonesia Vol 44, No 1 (2022): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2022.v44.35-41

Abstract

This paper presents the results of the analysis of surface casting defects and their countermeasures. To find out the root causes of defects, and their mechanisms. Product casting defects have been characterized by visual inspection and SEM/EDX, also collecting production data information. Studied relation between the composition of molding sand and the mechanical properties of compressive strength and surface stability index has been done. The visual inspection results, field data collection, and SEM/EDX analysis showed a rough product surface and the presence of SiO2 inclusions. The product has been made with an alkaline phenolic mold using reclaimed sand with a compressive strength of 18 kg/cm2. The study results show that with increasing binder levels, there is an increase in the mechanical properties of compressive strength and surface stability index. They were based on the experimental results of the test block product casting with improved mechanical properties above. Obtained a much better surface of the casting product, and relatively no surface inclusion defects were found. The above experiment shows that the surface stability index is an important parameter the critical value is 90%, and the necessary compressive strength is 20 kg/cm2. The effect of Loss on Ignition content on mechanical properties is also reviewed.
Co-Authors A. Rozaq A.S. Nugroho Adhi Satriyatama Adhitya Gandaryus Saputro Ahmad Nuruddin Akhmad Zein Eko Mustofa Aldo, Dian Afif Asep Ridwan Setiawan Azka Zakiyyatuddin Badruzaman Badruzaman Brian Yuliarto Cherly Selindiana Ekavianty Prajatelistia F.N. Sutandi Firmansyah Sasmita Firmansyah Sasmita Hariadi Tri Prasetia Haris Amaldi Haris Wahyudi Hermawan Judawisastra Husen Taufiq IGN Wiratmaja Puja IGN Wiratmaja Puja M. Maulana Ibrahim Muhammad Fathurrohman Nurcahyo Indro Basuki Prasetia, Hariadi Tri R. Rachmantyo Riska Rachmantyo Riska Rachmantyo Rochim Suratman Rochim Suratman Rochim Suratman Rochim Suratman Susana Susana Syahwira Taqwa Triadi T. Indriati Tatacipta Dirgantara, Tatacipta