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Pengaruh Variasi Desain Crash Box Pola Origami terhadap Kemampuan Penyerapan Energi Kusyairi, Imam; Agus Choiron, Moch.; Purnowidodo, Anindito
ROTOR Vol 8, No 2 (2015)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (614.395 KB)

Abstract

This study developed crash box design on origami patterns. These typically have got the dents whichserve as pre-folding. Therefore, the collapses modesarepredictable and stable. The geometry variation of crash box comprises four factors, i.e. basin length (c), distance between the basins (b), thickness (t) and number of segments (M). Meanwhile, the design of optimal variations utilized L9 Taguchi and deformas pattern analysis. The method of this study used software finite and the element of crash box modelling consists of three components, e.g. impactor, crashbox, and fixed support. The material used is AA7003-T7 modellingas thebilinear isotropic hardening. Model loading waconveyed 64 km/h on the impactor. The research shows that the response of quality characteristics of energy absorption is the larger the better. The energy absorption respectively covered 1)thickness (t), 2) segment (M), 3) distance between basins (b), and 4) basin length (c).Whereas, the highest energy absorption of the crash box occupied by the origami pattern no. 3 with c = 9 mm, b = 60 mm, t = 2 mm and M = 6,  reaching 7,247,826 J. In fact, the deformation behavior of the model no. 3 tends to have a symmetrical deformation without buckling. Keywords:Crash box, origami, energy absorbed,deformation
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (638.389 KB) | DOI: 10.22219/jemmme.v2i1.4689

Abstract

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.
THE INFLUENCE OF PROCESS PARAMETERS TOWARD COLLAR HEIGHT ON INCREMENTAL BACKWARD HOLE-FLANGING PROCESS Fakhruddin, Muhammad; Choiron, Mochammad Agus; Purnowidodo, Anindito
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 2, No 1 (2017)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (616.959 KB) | DOI: 10.22219/jemmme.v2i1.4899

Abstract

Abstract                  The experimental study of the influence of process parameters towards collar height on incremental backward hole-flanging (IBHF) process with aluminium plate workpiece was presented in this paper. The effect of process parameters toward collar height which produced by IBHF process was investigated. Experiments were performed with a CNC machine, a 30o conical forming tool, and aluminium plates. The process parameters are feed speed with two levels, radial forming step size with three, and axial forming step size with three levels. Some parameters were kept constant, i.e., spindle speed, initial hole diameter, final hole diameter, and conical forming tool diameter. Digital Vernier caliper was used to measure the height of the collar. Experimental results of IBHF process have shown that the feed speed (vf) parameter has no effect toward collar height. Increased radial forming step size (Δx/y), increased the collar height also. Increased the axial forming step size (Δz) reduced the collar height. Keywords: hole-flanging, incremental sheet metal forming, incremental backward.
Karakteristik Komposit Serat Kulit Pohon Waru (Hibiscus Tiliaceus) Berdasarkan Jenis Resin Sintetis terhadap Kekuatan Tarik dan Patahan Komposit Fadhillah, Arief Rizki; Setiyabudi, Sofyan Arief; Purnowidodo, Anindito
Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (600.249 KB) | DOI: 10.21776/ub.jrm.2017.008.02.7

Abstract

The fiber composite of hibiscus's bark is the material that comprises synthetic resin as a matrix and hibiscus's bast fiber as reinforcement. The hibiscus's bast fiber have the excellent potency regarding the strength that is employed as reinforcement. Four types of synthetic resin were used in this study, polyester BTQN 157, bisphenol A LP-1Q-EX, ripoxy R-802, and epoxy. The ratio of mass fractions between fiber and resin was 60:40. The initial treatment of the bast fiber hibiscus was immersed in 6 % of NaOH solution for two hours. The composites were manufactured through vacuum bagging process. Tensile strength and fracture mode of composites were investigated. The fiber composites of hibiscus tree bark with bisphenol A LP-1Q-EX resin has the best tensile strength and epoxy resin have a small fracture area was obtained.
Deformation and Energy Absorption of Fiber Metal Laminates (FMLS) After Ballistic Impact Load Fadly, Muhammad Syaiful; Purnowidodo, Anindito; Setyarini, Putu Hadi
SENATIK STT Adisutjipto Vol 5 (2019): Peran Teknologi untuk Revitalisasi Bandara dan Transportasi Udara [ISBN XXX-XXX-XXXXX-
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v5i0.361

Abstract

Estimated damage levels from ballistic impact zones provide valuable information to make bulletproof materials more effective. This study aims to determine the impact of ballistics including deformation and energy absorption in fiber metal laminates (FMLs) that collide with 9 mm FMJ caliber bullets at speeds of 426 m/s. Finite element method modeling is done using ANSYS 18.1 workbench software. The simulation results show that FMLs can hold the bullet rate with deformation on the back of the target (DOPIII) of 8,55 mm and total energy absorption of 426,59 J at 0,000095 s. The combination of two materials, Al 5083 in the outer layer and kevlar/epoxy as the core, results in faster energy absorption and maximum stress concentrations only occur in the kevlar/epoxy so there is no damage to the first and subsequent layers.
Perilaku Rambat Retak di Daerah Lubang yang Terekspansi pada Aluminium Alloy Syahrizal, Syahrizal; Purnowidodo, Anindito; Soenoko, Rudy
Jurnal Rekayasa Mesin Vol 5, No 1 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Mechanism of crack propagation is done by loading the cycle against the perforated metal material will be difficult to avoid, to fatigue crack growth rate can be a way to expand its peg with the hole that normally uses metal balls as an alternative. By using a materials testing machine type cantilever bending eccentric crank, life time of the materials are determined. Research using the method of cold expansion hole in the aluminum alloy metal material to a hole with a diameter of 5 mm in expansion using pin with variation of  5,1 mm,  5,15 mm and  5,2 mm made that crack found on the side of the hole would be difficult to propagate due to residual stress comparison. The result shows that there are residual stresses around the hole which varies depending on the diameter of the pin. In addition, there is growing tensile residual stress within a certain distance of the specimen being tested resulted in a faster growth rate, this causes the material usage time will be shorter.Keywords: cold expansion hole, materials testing machine, aluminumalloy, comparison residual stress, life time.
Analisis Fatigue Failure Suhu Rendah Struktur Batang Duralumin dengan Mesin Siklus Bending Tawaf, Nanang; Suprapto, Wahyono; Purnowidodo, Anindito
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Generally non-iron metals use in industries, including aluminum alloy, because of their high strength to weight ratio and favorable (no sparking and high corrosion resistance). Aluminum alloy are often found and used in airplane. Recently, aluminum alloy begins so popular in cryogenic system where it is highly applied at oil industry, low temperature operated, and automotive industry. It is estimated that 50%-90% mechanical failures are due to fatigue failure. This research attempts to predict duralumin fatigue resistance at low temperature and to understand the effect of micro structure on duralumin at low temperature. Several states, which include 15, 30, and 45 in MPa, are given to bending cycle machine. The tested material is duralumin (alloy Al-Cu) which has passed the tests over porosity, fatigue level at low temperature (-19o C) and room temperature (27o C), microstructure, fractography, and macrostructure. Result of research indicates that fatigue resistance increases with lowering work tense at specimen. Average fracture of duralumin fatigue at low temperature is more than 17,8 x 10 cycles, while at room temperature is 13 x 10 5 cycles. During low temperature fatigue test, microstructure shows long and small grains. The deformation during low temperature fatigue test cause smaller grain produce greater slip resistance for specimen.Keywords: Fatigue Failure, Low Temperature, Duralumin, Bending Cycle
Pengaruh Woven Angle dan Proses Penekanan terhadap Tegangan Tarik pada Natural Fiber Laminate Composite Anam, Khairul; Purnowidodo, Anindito; Setyabudi, Sofyan Arif
Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (670.68 KB) | DOI: 10.21776/ub.jrm.2018.009.03.1

Abstract

The aim of this study is to investigate the effects of pressure and woven angle on the tensile strength of natural fiber laminate composite. Pandanus tectorius and polymethyl methacrylate (PMMA) was used as natural fiber and matrix, respectively. The epoxy adhesive joint is used to connect between natural fiber and matrix. The pressure time of 10 s,15 s, 30 s and the pressure of 20 N/mm2, 40 N/mm2, 60 N/mm2 were used in this study. In addition, the angle of the 0o / 90o and 45o / 45o woven angle is used as the initial reference for fiber orientation before pressure is applied. From the results of the study, it can be concluded that the addition of a pressure of 60 N / mm2 and pressure time of 30 s has the highest tensile strength both at the angle of 0o / 90o and 45o / 45o. However, the tensile strength at the angle of 0o / 90o is higher that 45o / 45o. In addition, the number of adhesives decreased with increasing the pressure which will lead to delaminating.
Pengaruh Mechanical Bonding pada Aluminium dengan Serat Karbon terhadap Kekuatan Tarik Fiber Metal Laminates Firmansyah, Hilmi Iman; Purnowidodo, Anindito; Setyabudi, Sofyan Arief
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (877.239 KB) | DOI: 10.21776/ub.jrm.2018.009.02.9

Abstract

Fiber metal laminates (FML) are composite structures fabricated by combining two layers of surface material with the core material. The outer surface of FML used in this composite is Aluminum with Al 1100 type. The FML core material uses carbon fiber. The fabrication process of the composites utilizes vacuum infusion method, in which the resin is infused into the mold with a vacuum condition. Bonds between the core and the surface layers are the variables affecting the strength of FML. In this research, the method used to increase the bonds between layers in FML was a mechanical method, it?s called mechanical bonding. This method involved providing roughness (Ra) on the aluminum surface using sandblasting process to produce different roughness variables, with roughness value of 1,68 ?m; 1,78 ?m; 1,93 ?m; 2,128 ?m and 2,887 ?m. The aim of this study was to examine the effect of aluminum surface roughness to the tensile strength of fiber metal laminates composites. The highest tensile strength of FML was obtained at 2,887 ?m with a value of 367 MPa.
Pengaruh Fraksi Volume Dan Panjang Serat Pelepah Lontar (Borassus Flabellifer) Terhadap Kekuatan Tarik Dan Kekuatan Impak Komposit Bermatrik Epoksi Tuati, Amros Alfonsius; Purnowidodo, Anindito; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (425.362 KB) | DOI: 10.21776/ub.jrm.2015.006.01.5

Abstract

This study was conducted using epoxy resin as ligature and midrib lontar fibers (borassus flabellifer) as brace. Composite was made by varied fiber volume fraction 10%, 30% and 50% with length variation 10 mm, 20 mm, and 30 mm. The composite production used hand lay-up method. The test result showed the highest composite tensile strength about 31.607 Mpa in volume fraction 10% with fiber length 30 mm. The lowest composite tensile strength was about 16.855 Mpa in fiber volume fraction 10% and 20 mm in fiber length. Moreover, the highest composite impact strength was 0.00163 J/mm in fiber volume fraction 50% with fiber length 30 mm and the lowest impact strength was 0.00214 J/mm 2 in fiber volume fraction 10% and 10 mm fiber length. The kind of composite fracture tended to have brittle fracture with mechanism of fiber pull out.