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All Journal Rotasi Jurnal Sains Materi Indonesia Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) IPTEK Journal of Proceedings Series SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Jurnal Mechanical Mesin PROCEEDING STIMA Jurnal Teknologi Bahan dan Barang Teknik Metalurgi

Rochim Suratman

Institut Teknologi Bandung

Author-ID : 394367

Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (678.226 KB)

This paper presents experimental and numerical analysis on the inï¬uence 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. 5Â°, 10Â°, 15Â°, 30Â°, 45Â° 65Â°, 75Â°, 80Â°, and 90Â°. 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 ï¬nite 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 Wuâs(11) Criteria for unidirectional lamina and Hahnâs[6] Criteria for general anisotropic lamina, a new mixed mode fracture toughness criteria is developed for woven ï¬ber matrix laminate.

PROTOTIPE MESIN UJI LELAH Muchsin, Muchsin; Suratman, Rochim; Sutjiatmo, Bambang; Surdia, Tata
Mesin Vol 3, No 4 (1984)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (960.566 KB)

Prototipe mesin uji lelah dengan beban tarik bolak-balik dari jenis mekanis direncanakan dan dibuat. Mekanisme beban awal statis terdiri dari baut, puli-mur, tali dan masa pembeban. Spesimen dipegang dengan pasak-pasak yang dapat dikencangkan. Pegas pembeban dipasang seri dengan spesimen. Beban bolak-balik dibangkitkan dengan engkol atur. Batang-batang penghubung, batang transmisi, bersama-sama engkol atur menyusun mekanisme pembebanan.

Sifat Mekanik Packaging Kertas Berbahan Dasar Selulosa Alga Cladophora Mardiyati, Mardiyati; Steven, Steven; Suratman, Rochim; Santosa, Sigit Puji
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.833 KB)

Alga cladophora merupakan salah satu alga yang banyak tumbuh di pesisir pantai Indonesia. Alga cladophora memiliki kandungan selulosa yang cukup tinggi sehingga sangat berpotensi untuk dimanfaatkan sebagai bahan baku material packaging kertas. Tujuan dari penelitian ini adalah mempelajari sifat mekanik kertas yang berbahan dasar selulosa alga cladophora. Pada penelitian ini, selulosa alga cladophora diekstraksi melalui beberapa tahapan proses yang meliputi proses alkalisasi dan proses hidrolisis. Proses alkalisasi dilakukan dengan merefluks alga cladophora didalam larutan NaOH (1%, 5%, 10%, 15% dan 17.5%) pada temperatur 100 ? selama 2 jam. Proses hidrolisis dilakukan dengan merefluks alga cladophora hasil alkalisasi didalam larutan asam sulfat 1 M pada temperatur 100 ? selama 2 jam. Proses pembuatan kertas dilakukan dengan metode solution casting. Kandungan selulosa diukur dengan menggunakan metode Chesson-Datta. Sifat mekanik dari kertas selulosa alga cladophora diukur dengan pengujian tarik. Dari hasil pengukuran kandungan selulosa dapat disimpulkan bahwa selulosa yang diekstrasi dengan menggunakan larutan NaOH 17.5% memiliki tingkat kemurnian yang paling tinggi, yakni 94. 76%. Selulosa yang diekstraksi dengan menggunakan larutan NaOH 17.5% menghasilkan kertas dengan permukaan yang paling halus serta memiliki kekuatan tarik dan kekakuan yang paling tinggi dibandingkan dengan kertas lainnya yang dihasilkan dalam penelitian ini, yakni 57.68 MPa dan 10.12 GPa.

PENGARUH PENAMBAHAN UNSUR Cr DAN Cu TERHADAP KEKUATAN TARIK BESI COR KELABU FC20 Suprihanto, Agus; Satrijo, Djoeli; Suratman, Rochim
ROTASI Volume 9, Nomor 1, Januari 2007
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

The mechanical properties of grey cast iron are influenced by cooling rate, thickness of casting, heat treatment,liquid treatment and alloying. Some aplications of its materials need high strength grey cast iron. To improve itstensile strength usually its added with unsures which known as carbide promoteur ie. Cr and Cu.In these research the effect of Cr and Cu on the mechanicals properties of grey cast irons has been evaluated.Base material FC 20 which alloyed with Cr 0,23 %, 0, 32% and 0,47% and Cu between 0,6% to 0,7% have beentested. The tensile test and metallographyc examinations have been conducted to known of its efects.From tensile test there is an improvement of tensile strength about 20% from 191MPa to 232MPa. However themicrostructure of specimens are same which are pearlitic grey cast irons, with graphite type VII (flake), Adistributions and size of graphite are 3-5.

PENGARUH PENAMBAHAN KROMIUM DAN TEMBAGA TERHADAP KEKUATAN LELAH BESI COR KELABU Suprihanto, Agus; Suratman, Rochim
ROTASI Volume 8, Nomor 1, Januari 2006
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

The mechanical properties of grey cast irons can be modified with alloying elements. Cr and Cu have beenknown as elements that can improve tensile strength of grey cast irons. The improvement of tensile strength can beinfluence of fatigue strength. The goal of this research is to study the effect of alloying Cr and Cu on the fatiguestrength.Four materials of grey cast irons have been conducted to high cycle fatigue testing on the rotating bendingmachine. The first material is grey cast irons without added Cr and Cu, and the other have added. The percentages ofCr have been added are 0,23% wt, 0,32%wt and 0,47%wt and Cu 0,6%wt to 0,7%wt. The metallographyc examinationsand tensile test also have been conducted.The result of this research are the material has the same microstructure. The microstructures of its materials arepearlitic grey cast irons with graphite type VII, distribution A and size of graphite 3-5. The tensile, endurance andfatigue strength of materials, which added Cr and Cu significantly rising, compared with base materials. The tensilestrength rose from 191MPa to 232MPa and the endurance strength raised from 94 MPa to 110MPa. However threemodified materials, which added Cr, and Cu has the same effects.

KARAKTERISASI KOMPONEN PLAT HARD DISK SEBAGAI MEDIA PENYIMPAN DATA Sinta Rismayani; Rochim Suratman; Ahmad Afandi; Andoko W; Tri P; Novrita Idayanti
Jurnal Sains Materi Indonesia Vol 7, No 1: OKTOBER 2005
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

KARAKTERISASI KOMPONEN PLAT HARD DISK SEBAGAI MEDIA PENYIMPAN DATA. Plat merupakan komponen terpenting dalam suatu hard disk dikaitkan dengan fungsinya sebagai media penyimpan data. Pengujian komposisi material yang menyusun hard disk dalam percobaan ini dilakukan dengan menggunakan alat EDS (Energy Dispersive Spectometer). Pengujian strukturmikro dilakukan dengan Omniment mikroskop optik dan SEM. Pengujian kekerasan dilakukan menggunakan LECO Hardness Testing Maschine M-400-HI. Material penyusun lapisan hard disk dalam percobaan ini terdiri dari Ni 78%, P 13%, Cr 4% dan Co 5%. Sedangkan material substrat terdiri dari paduan logamAl-Mg. Pengujian hardness sebesar 72 VHN sesuai dengan karakteristik paduan Al-Mg. Pengamatan terhadap strukturmikro lapisan Al-Mg menunjukkan bentuk butiran equiaxial sehingga menggambarkan pembuatan lapisan ini menggunakan cara penekanan isostatik. Tebal lapisan di atas paduanAl-Mg adalah 10 μm, sedangkan strukturmikro lapisan tipis tidak berhasil diamati.

ANALYSIS OF MICROSTRUCTURE AND HARDNESS OF WELDED JOINTS OF DISSIMILAR STEEL OF AISI 1018 - AISI 304 Gilang Gumilar; Imin Abdulah; Rochim Suratman; Asep Ridwan Setiawan
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
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.2019.20.4.5280

This research studies the microstructure and hardness property of shield metal arc welding (SMAW) from dissimilar metals between austenitic stainless steel (SS) AISI 304 and low carbon steel (LCS) AISI 1018 using E308 filler metal. The procedure used was LCS-to-LCS welding carried out without post weld heat treatment (PWHT) and SS-to-SS welding followed by PWHT at a temperature of 1000ÚC and holding time for 12 minutes. Then, it was followed by shock cooling in aqueous media. The difference in PWHT stages in the two procedures is expected to affect the microstructure and hardness of the welding results. This was conducted to find out more precise procedures in the SMAW technique for welding dissimilar metals like AISI 304 with AISI 1018 so that the risk of chromium carbide precipitate formation and the low hardness of welded joints can be reduced. The results showed there were chromium carbide precipitates in the heat-affected zone (HAZ) of AISI 304, grain enlargement in the HAZ area of both steels, as well as the formation of the ferrite delta phase in the welding area by LCS-to-LCS welding. While the value of hardness in the HAZ area of AISI 304 has decreased, increases occur in the HAZ area of AISI 1018 in all welding conditions. In addition, PWHT treatment can increase the hardness on the AISI 1018 side due to the formation of the martensite phase, decrease in the hardness value on the AISI 304 side, and the reduced ferrite delta phase and the number of chromium carbide precipitates.

KARAKTERISTIK KOROSI ALUMINIUM DAN BAJA TAHAN KARAT Rochim Suratman
Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Vol 2, No 1 (2001): Februari 2001
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jstni.2001.2.1.1670

KARAKTERISTIK KOROSI ALUMINIUM DAN BAJA TAHAN KARAT. Peristiwa korosi pada logam dan paduan seringkali merupakan peristiwa yang perlu mendapat perhatian yang serius, karena peristiwa ini berkaitan dengan umur pakai sesuatu bahan. Bahkan dalam hal tertentu, proses korosi yang tidak terawasi dan tidak terkendali, bisa mengakibatkan kecelakaan pada suatu instalasi. Makalah ini membahas peristiwa korosi pada logam, antara lain kondisi yang berpengaruh pada korosi serta kemungkinan jenis korosi yang terjadi terutama jenis korosi yang terjadi pada aluminium dan baja tahan karat .

The Effect of Substrate Pre-treatment on Hydroxy-apatite Coated Titanium Alloy by High-velocity Oxy-fuel Process Raden Dadan Ramdan; Budi Prawara; Rochim Suratman; Ferdian Marta; Ali Rinaldi
JURNAL MECHANICAL Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v8.i1.201701

In order to fully meet bio-compatibility requirement of titanium alloy as implant material, coating with hydroxyapatite (HA) is normally applied. The present research concerns on the effect of substrate pre-treatment on the coating of HA on titanium alloy by high-velocity oxy fuel process (HVOF). Before the coating, all samples were pre-treated by thermo-mechanical treatment in order to obtain fine grain structure. Three type of substrate pre-treatment is then applied on different substrates, including, sand-blasting, sand-blasting+etching, and sand-blasting+etching+CNT intermediate layer. After coating, post-annealing treatment was applied on each sample and characterization was performed on the sample after the treatment. It was obtained that the sand-blasted sample has relatively rougher surface (SEM observation), lower degree of crystallinity (XRD characterization) and higher residual strain (XRD data calculation by Mud Master software) as compared with other samples. From FTIR characterization it can be obtained that all samples show no differences in orbital function.

Feasibility Study Wear Rate Measurement Using 3D Scan Imaging Kurniawan Kurniawan; Rochim Suratman; Bagus Budiwantoro; Satryo S. Brodjonegoro; Riona I. Media
IPTEK Journal of Proceedings Series No 3 (2019): International Conference on Engineering Technology Advance Science and Industrial Appli
Publisher : Institut Teknologi Sepuluh Nopember

This paper studied on optimizing the 3D scan parameters of flared chisel bucket teeth as a worn component to achieve prospect scanning micro wear in different percentage of volume loss. Taguchi L8 orthogonal array was used to design of experiment. Specimen composed in three different volume loss 1%, 3%, and 5% were scanned to obtain model CAD volumes. Volume dissimilarity was calculated by comparing model CAD volume and mass – density conversion. Shutter Time, grid, distance, and meshing were chosen as 3D scan parameters. Biggest effect and optimal scanning parameter were determined using the signal-to-noise (S/N) ratio which was calculated for volume dissimilarity according to the ‘‘the-smaller-the-better’’ approach. The effects of scanning parameter were evaluated by analysis of variance. 3D imaging feasibility study for small volume measurement could be a critical point in micro wear measurement. The statistical analysis indicated that the parameters that have the biggest effect on volume dissimilarity with 1%, 3%, and 5% volume loss are the meshing method and distance, respectively. The optimal setting parameter capturing image is 12 ms shutter time with normal meshing above 15 mm distance. Additionally, the interaction scanning parameter for 1%, 3%, and 5% volume loss was presented.

Co-Authors Agus Suprihanto Agus Suprihanto Ahmad Afandi Ako, Henry Ali Rinaldi Andoko W Azis Azis Azis Azis, Azis B Widyanto Bagus Budiwantoro Bambang Sutjiatmo Bambang Widyanto Bandanadjaja, Beny Basuki, Arif Batam W, Durman Beny Bandanadjaja Budi Prawara Budi Prawara Cakranegara, Pandu Adi Cherly Selindiana Dian Susanto Dikdik Kuswaya Djoeli Satrijo Durman Batam W Erie Martides Ferdian Marta Gilang Gumilar Gunawan Refiadi Handojo Handojo Handojo Handojo Hariadi Tri Prasetia Haris Wahyudi Hendy Roesma Wardhana Henry Ako Hermawan Judawisastra Hermawan Judawisastra Ida Farida IGN Wiratmaja Puja IGN Wiratmaja Puja Imin Abdulah Irma Pratiwi Kurniawan Kurniawan Kuswaya, Dikdik M, Sudin Mardiyati Mardiyati Mardiyati, Mardiyati Muchsin Muchsin Novrita Idayanti Nurdesri Srahputri Permana, Muki Satya Prasetia, Hariadi Tri Ramdan, Raden Dadan Ramelan, Aditianto Rd. Dadan Ramdan Reza Reza Reza, Reza Riona I. Media Riza Wirawan Santosa, Sigit Puji Satryo S. Brodjonegoro Setiawan, Asep Ridwan Sinta Rismayani Siswahyudianto Srahputri, Nurdesri Steven Steven Steven Steven Sudin M Surdia, Tata Sutjiatmo, Bambang Syahwira Taqwa Triadi Tata Surdia Tatacipta Dirgantara, Tatacipta Tri P Widyanto, B Yudiyanto, Oyok

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