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All Journal Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN Journal of Mechanical Engineering Science and Technology Journal of Energy, Mechanical, Material and Manufacturing Engineering Automotive Experiences

Moch. Agus Choiron

Staf Pengajar Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya Malang

Author-ID : 247201

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PEMANFAAT FREKUENSI BUNYI MATERIAL SEBAGAI DASAR PENGUJIAN MODULUS ELASTISITAS PADA PENGUJIAN TANPA MERUSAK (NON DESTRUCTIVE TEST) Hentihu, M. Fahrur Rozy; Djaelani, Abdul Hadi; Choiron, Moch. Agus
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

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Elastic modulus of material are usually obtained from tensile test. Tensile test categorized as destructive test. One of destructive test weakness is the testing specimen can not be reused. So we need alternative on elastic modulus test without damaging the specimen (non destructive test). This research aims to determine whether the sound frequency of material can be used as a basic for elastic modulus test as a non destructive test. On this research, two different test performed on the same specimen. First test is testing elastic modulus using sound frequency test (non destructive test) and second test is testing elastic modulus using tensile test (destructive test). Percentage error obtained from comparing percent error between those two tests. The results showed, in testing the elastic modulus of brass specimen has an error percentage of 10.33%, in testing the elastic modulus of aluminium specimen has an error percentage of 4.39%, and in testing the elastic modulus of steel specimen has an error percentage of 1.89%.Â Keywords: Elastic modulus, Non destructive test, Sound frequency

Defect Prediction at The Superplastic Forming Process of The Bipolar Plate by Simulation Choirotin, Ismi; Choiron, Moch. Agus
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 3, No 1 (2018)
Publisher : University of Muhammadiyah Malang

Â Improper parameter setting at the bipolar plate forming by superplastic process will outcome damage to the final workpiece. By employing computer simulation, the defect at the bipolar plate could be predicted close to the maximum thickness reduction and the effective stress data. Simulate the fabrication of bipolar plate by a number of forming temperature (350 â 450 Â°C) and air pressure (0.25 â 1 MPa) utilize Ansys, resulting maximum thickness reduction and effective stress occurred at 450 Â°C and 1 MPa. Make reference to the result, the bipolar plate didnât expose any deficiency with 36.75% maximum thickness reduction. Have recourse to simulation will abbreviate the trial and error method as of the production process will more effective and efficient in terms of time and cost

Energy Absorption and Deformation Pattern Analysis of Initial Folded Crash Box Subjected to Frontal Test Choiron, Moch. Agus; Ida, Zumrotul; Purnowidodo, Anindito; Rivai, Ahmad
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 2, No 1 (2017)
Publisher : University of Muhammadiyah Malang

Crash box design as one of the passive safety components in a vehicle had been developed to enhance energy absorption. Initial fold on the crash box is set to facilitate folding during the crash. The aims of this study is to investigate the initial folded crash box with length to thickness ratio subjected to frontal test. The frontal test is modelled by using finite element analysis. Through computer simulation using 9 models, the obtained result was used to provide the better design of crash box. The variations in this study were length to thickness ratio of crash box with length of tube (L) = 115; 132.5; 150 mm and the thickness of tube (t) = 1.6; 2.0; 2.5 mm. The crash box material was assumed as bilinear isotropic hardening material. The velocity used in the simulations was 7.67 m/s with impact mass of 103 kg. Based on the results, it can be shown that 1st model to 8th model produce deformation pattern as concertina mode and 9th model has diamond mode. The 3rd model has the largest energy absorption with value 18.29 kJ.

Surface Modification with Silane Coupling Agent on Tensile Properties of Natural Fiber Composite Wirawan, Willy Artha; Setyabudi, Sofyan Arief; Widodo, Teguh Dwi; Choiron, Moch. Agus
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 2, No 2 (2017)
Publisher : University of Muhammadiyah Malang

Biocomposite is an innovation of renewable material in engineering made from the bark fiber of waru (Hibiscus tiliaceus, the bark is environmentally friendly and has the potential to be developed. The purpose of this study is to modify biocomposite by adding methacryloxypropyltrimethoxysilane-coupling agent on waru bark fiber (Hibiscus tiliaceus) as an effort to improve tensile properties. Waru bast fibers, as reinforcement, were prepared by alkali procces using 6% NaOH solution for 120 minutes and then added 0.75% coupling agent andÂ ordered using continous fibers with 0Â°/0Â°, 0Â°/90Â° and 45Â°/45Â° orientation. After that, the Biocomposites Â were formed with a polyester matrix using Vacuum Pressure Resin Infusion (VAPRI) method. The results of SEM tested showed the quality improvement of the bonds bringing significant impact on the tensile properties of the waru bark biocomposite. On the continous fiber 0Â°/90Â° orientated Â showed that the highest strength was 401.368 MPa, while biocomposites with 45Â°/45Â° orientation has lowest tensile strength of 65.243 MPa

Analisis Penyerapan Energi Dan Pola Deformasi Crash Box Dengan Variasi Sudut Tirus Dinding Crash Box Pada Uji Simulasi Tabrakan Arah Frontal Choiron, Moch. Agus; Darmadi, Djarot B.; Anwari, Bintang Rahmaddian
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Sistem transportasi merupakan salah satu kebutuhan yang penting untuk dipenuhi dalam mempermudah kehidupan pada zaman modern ini. Di sisi lain, meningkatnya kebutuhan akan hal tersebut juga akan ikut meningkatkan produksi kendaraan yang secara tidak langsung turut meningkatkan jumlah kecelakaan. Meninjau hal tersebut, standar keselamatan kendaraan yang lebih baik sangat dibutuhkan, salah satunya adalah crash box. Crash box merupakan sistem keamanan pasif yang digunakan untuk mengurangi tingkat keparahan kecelakaan yang dialami penumpang atau bagian kendaraan yang vital akibat tabrakan. Penelitian ini meninjau pengaruh variasi sudut tirus dinding crash box berpenampang lingkaran (circular) terhadap pola deformasi dan penyerapan energi pada uji simulasi tabrakan arah frontal. Penelitian dilakukan dengan software berbasis metode elemen hingga (MEH). Variasi yang digunakan dalam penelitian ini yaitu crash box dengan sudut tirus (Î±) 0,2Â°; 0,4Â°; 0,6Â°; 0,8; dan 1,0Â° dengan material crash box baja AISI 1340. Dari hasil penelitian diperoleh bahwa pola deformasi yang terbentuk adalah pola aksial dengan mode concertina dan campuran (concertina + diamond). Deformasi mode campuran terjadi pada crash box t a 1,6 Î± 0,0Â°; Î± 0,8Â°; Î± 1,0Â°. Penyerapan energi meningkat seiring bertambah besarnya sudut tirus dinding crash box, dengan kemampuan menyerap energi terbesar pada crash box dengan sudut tirus (Î±) 1,0Â° sebesar 10823 J. Semakin besarnya sudut tirus dinding crash box juga menunjukkan peningkatan penyerapan energi spesifik crash box.

Effects of Origami Pattern Crash Box and Rectangular Pattern Crash Box on The Modelling Of MPV Car Structure on Deformation Kusyairi, Imam; Choiron, Moch. Agus; Irawan, Yudy Surya; Himawan, Helmy Mukti
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 3, No 2 (2018)
Publisher : University of Muhammadiyah Malang

Crash box serves as a kinetic energy absorber during collision. It has a tube shape, which is located between bumper and chasis. The crash box design requires development in order to reduce buckling mode and obtain symmetry folding mechanism, so it will achieve greater energy absortion. The researchers find a method to reduce tension due to impact by providing dents in crash box geometry. This research observed origami pattern crash box design having dents functioned as pre-folded so that collapse mode can be predicted and stable. In this research, the crash box was modeled according to the size of bumper and chassis on the MPV car. Testing simulation was performed by modelling Impactor as rigid body and crash box as flexible. Fixed support was housted in the surface of rear side of the crash box. Simulation process was started from the impactor moving to supress crash box. This Impactor collision led to deformation on the crash box. Crash box material was AA7004-T7, it was modelled as bilinier isotropic hardening. Based on the research result, the addition of pre folded pattern is able to reduce impact force at the first impact and has stable characteristic as well as predictable collapse mode.

Pengaruh Variasi Sambungan pada Crash Box Multi Segmen terhadap Kemampuan Penyerapan Energi dengan Uji Quasi Static Halman, Halman; Choiron, Moch. Agus; Darmadi, Djarot B.
Jurnal Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Along with the elevating number of cars, accidents due to car crashes are increasing. Therefore, technology is needed to reduce the occurrence of the driversâ€™ injuries. Crash box is one of the potential passive safety technology which is widely observed today. Crash box is installed between bumper and chassis, aims to reduce the cassualties when the car crashes. In this article, crash box research was conducted by real experimental method through quasi-static test to evaluate the energy absorption capability of circular-shaped multi-segment crash box. Crash box material was made from aluminum A6063. The connection on each segment is a chamfer with 45o angle. The connections between segments 1 and 2 were varied with 3 connection models, those are 1/4, 1/3 and 1/2 of the total length, i.e.120 mm. The results of the study showed that, the highest energy absorption obtained from the crash box with connection of 1/2 and the energy absorption is 5249.726 J. Crash box type of 1/4 and 1/3 exhibit energy absorption of 3886.238 J and 3106.027 J respectively. Generally, the deformation pattern on the crash box is mixed-mode (axisymmetric-diamond).Â

Pengaruh Waktu Pemanasan (Anil) terhadap Ketahanan Korosi pada Gelas Metalik Berbasis Zirkonium Anggriawan, Ongki Budi; Choiron, Moch. Agus; Lin, Jing Chie
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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The effects of annealing time on the corrosion resistance of a Zr-based bulk metallic glass (BMGs) were studied. The Zr 48 Cu 36 Al 8 Ag BMGs annealed at the temperatures of 471 oC for 0, 23 and 27 min respectively. The partially and fully crystallized was identified by differential thermal analysis (DSC) and by X-ray diffraction (XRD). The corrosion resistances of those BMGs was identified by open circuit potential (OCP), Tafel plot (TP), dan cyclic anodic potentiodynamic polarization (CAPD). The results show that the as-cast of Zr 8 48 Cu 36 Al BMGs (0 min, full amorphous) has higher corrosion resistance than that of the annealing specimen for 23 and 27 min, while the fully crystallized specimen (27 min) has worst corrosion resistance when compared to the other samples in 0.1 M NaCl solution. The improvement of the corrosion resistance for as-cast (0 min) is better than annealed specimen (23 and 27 min), because the as-cast does not have defects like grain boundary (full amorphous). When the annealing time is longer (27 min), the crystallites grow up (more boundary regions), therefore increasing the susceptibility to the localized corrosion.Keywords: Metallic glass, Zr-Cu-Al-Ag, corrosion, NaCl

Optimasi Dimensi Tebal Awal Pelat Pada Proses Pembengkokan Bentuk Jogged Flange Dengan Simulasi Tiga Dimensi Choiron, Moch. Agus; Ariseno, Agustinus; Prasetyo, Andika
Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (424.298 KB)

One of the problem of bending process is the final product dimension that it is not agree with the expected results. To reduce trial and error of parametersdesign, designers can utilize computer simulations to predict parameter process virtually and more time-saving analysis. The aim of this study is determine the variations effect of initial blank material thickness to the flange flatness of the final product in the jogged flange process.In order to find the influence on the uneveness of the flange bend, the parameters of plate thickness, flange radius ratio, and flange length ratio are selected. Verification models were created to justify the trend data between modeling and the experimental results.From the result, the elevation difference on uneveness of the flange bendwas obtained. For initial blank material thickness dimensions, it can be seen that the minimum value of the uneveness defect can be obtained by using equal of plate area ratio. The observed increase of the flange radius could be attribute to decrease of uneveness of the flange bend. The increase of plate thickness, uneveness of the flange bend will be decrease.Keywords: initial blank material thickness, jogged flange, uneveness of the flange bend

Hardening Baja AISI 1045 Menggunakan Gel Aloe Vera Sebagai Media Pendingin Budiyanto, Eko; Choiron, Moch. Agus; Darmadi, Djarot B.
Jurnal Rekayasa Mesin Vol. 7 No. 2 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Quenching is a cooling method of heat treatment for metal hardening. Quenching refers to the process of rapidly cooling metal parts from the austenitizing or solution treating temperature, typically from within the range of 815 to 970 Â°C for steel. The selection of a quenchant medium depends on the hardenability of the particular alloy, the section thickness and shape involved, and the cooling rates to achieve the desired microstructure. The liquid quenchants of oil is commonly used in industrial manufacture. But, oil is not environmental. The aim of this research research is to find new quenchant for change oil as quenchant to more environmental. Gel aloe vera is purposed for it. The material used in this study is AISI 1045 steel. Cooling curve and cooling rate is measured by finite element model, ANSYS APDL 14.5. True experimental is done to view microstructure and measure hardness of steel. Simulation result shown that gel aloe vera has almost similar cooling curve and cooling rate with oil. Microstructure result of steel for gel aloe vera as quenchant is martensite in surface, bainite in center, and pearlite in between surface and center. Hardness number of steel for gel aloe vera as quenchant is 189.63 HVN in surface, 182.566 HVN in center, and 162.866 HVN in between surface and center. By simulation and true experimental analisys concluded that gel aloe vera has opportunities to change oil as quenchant for hardening process.

Co-Authors A.A. Ketut Agung Cahyawan W Abdul Hadi Djaelani, Abdul Hadi Agustinus Ariseno Andika Prasetyo Anggriawan, Ongki Budi Anindito Purnowidodo Asroni Asroni Asroni, Asroni Avita Ayu Permanasari Bintang Rahmaddian Anwari, Bintang Rahmaddian Djarot B. Darmadi, Djarot B. Djuanda, Dagus Resmana Eko Budianto EKO BUDIYANTO Halman, Halman Helmy Mukti Himawan, Helmy Mukti Hentihu, M Fahrur Rozy Ida, Zumrotul Imam Kusyairi, Imam Ismi Choirotin Jatmiko Awali Jatmoko Awali Junipitoyo, Bambang Lin, Jing Chie Mohamad Irkham Mamungkas Muhammad Fakhruddin Nadya, Mesti Pratama, Fajar Adi Redyarsa Dharma Bintara Ridwan, Ridwan Rismanto, Muhammad Rivai, Ahmad Sabitah, A’yan Safari, Rachmat Setyo Hariyadi Shiddieqy, M. Hasbi Ash Sofyan Arief Sugiono Sugiono Suudy, Ahmad Hamim Totok Tri Prasetyo Wahyono Suprapto Widodo, Teguh Dwi Wirawan, Willy Artha Yudy Surya Irawan Zakariya, Yahya

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