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Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin
Published by Universitas Mataram
ISSN : 2088088X     EISSN : 25021729     DOI : https://doi.org/10.29303/dtm.v14i1
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Mechanical Engineering Physics
The Dinamika Teknik Mesin is a peer-reviewed academic journal which publishes originally research papers or simulation/computational articles in all aspect of Mechanical Engineering such as energy conversion, materials, design and production/ manufacturing. The Dinamika Teknik Mesin publishes in two issues per volume annually appearing in June and December. Due to administrative constraints, then starting in January 2018, the Dinamika Teknik Mesin publishes the volume and issue in January and July. However, starting in 2020, the Dinamika Teknik Mesin publishes issues in April and October due to the new administration.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 452 Documents
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Optimasi parameter resistance spot welding pada pengabungan baja electro-galvanized menggunakan metode Taguchi Sukarman, S.; Abdulah, A.
Dinamika Teknik Mesin Vol 11, No 1 (2021): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v11i1.372

Abstract

The present study features analytical and experimental results of optimizing resistance spot welding performed using a pneumatic (electrode) force system (PFS). This optimization was carried out to incorporate the galvanized steel sheet material SECC-AF (JIS G 3313) and SPCC-SD (JIS 3141) sheet plate coated with zinc with a thickness of about 2.5 microns. The zinc coating on the metal surface causes its weldability to decrease. This study aims to obtain the highest tensile shear strength test results from the combination of the specified resistance spot welding parameters. The research method used the Taguchi method using four variables and a combination of experimental tingkats. This study's experimental tingkat is two tingkats in the first parameter and three tingkats in other parameters. Taguchi optimization results show that the highest tensile shear strength test obtained is 5049.64 N. This was achieved at 22 cycles of squeeze time, 25 kA of welding current, and 0,6-second welding-time, and 12 cycles of holding-time. The S / N ratio analysis found that the welding time had the most significant effect, followed by welding current, holding time, and squeeze time. The delta S / N ratio values were 0.62, 0,41, 0.34 and 0.07, respectively.
Analysis of the immersion time of nettle fiber in NaOH and silane on the hardness and toughness of composite hybrid materials Suarsana, K.; Suryawan, I.G.P.A.; Sunu, P.W.; Triadi, A.A.A.
Dinamika Teknik Mesin Vol 12, No 2 (2022): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v12i2.573

Abstract

The advantages of stinging nettle fiber (Urtica dioica L.) properties as a substitute for synthetic fibers for reinforcing composite materials are its strength and light weight compared to other natural fibers. This study aims to find the mechanical properties of hybrid composites reinforced with stinging nettle fiber based on immersion treatment of the fibers with chemical solutions. The mechanical properties studied include the hardness and toughness of the hybrid composite. This paper examines the effect of fiber immersion time in NaOH and Silane coupling agent solutions at concentrations of 3% and 9% which are used as reinforcement for hybrid epoxy resin composites. Variations of fiber immersion time in NaOH and Silane solutions: 30, 60, 90, and 120 minutes. Hybrid composite was produced by hand lay-up molding method. The results showed that the highest value of hardness was 88,254 VHN and toughness was 7,459 kJ/m2 at 9% immersion. NaOH solution can remove impurities and lignin in the fiber and Silane coupling agent can form strong bonds because it has a hydroxy group. Based on the results of the study, it can be concluded that the hardness and toughness of the hybrid composite reinforced by stinging nettle fiber has higher hardness and toughness at 9% NaOH and Silane treatment with immersion time of 120 minutes.
Kajian Pengaruh Fraksi Volume Serat Akibat Perlakuan Alkali Terhadap Ketangguhan Impak Komposit Limbah Serat Aren-Polyester Wijoyo, Wijoyo; Nurhidayat, Achmad; Purnomo, Catur
Dinamika Teknik Mesin Vol 1, No 2 (2011): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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Abstract

The purpose of this study is to investigate the influence of fiber volume fraction of the impact strength of palm fiber-unsaturated polyester composite and investigate the mechanism of fracture caused by impact loads. This research material is palm fiber (Arenga pinnata), unsaturated polyester matrix yukalac BQTN-EX 157 type, hardener metyl etyl ketone peroxide (MEKPO), alkali solution (NaOH) and H2O. Testing with Charpy impact tester, impact test specimens prepared according to standard test ASTM D-5942. While the macro picture is used for the analysis of the fracture. The results showed that the most optimum impact toughness of palm fiber-polyester composite reached 0.011 J/mm2 on volume fraction (Vf) 40%. While the interaction characteristics of palm-fiber bond strength polyester showed matrix cracking behavior of failure on volume fraction (Vf) 10% to 30%, and fiber pull out the volume fraction (Vf) 40% and 50%, the same fracture behavior between the matrix and fibers in volume fraction (Vf) 40% indicates that fiber and matrix has a strong bonding interaction.
Peranan medan magnet dan campuran etanol-biodiesel minyak jelantah pada pembakaran droplet terhadap perilaku api dan emisi gas buang Perdana, D.; Fiyanto, S.F.W.A.
Dinamika Teknik Mesin Vol 14, No 2 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i2.924

Abstract

Petroleum reserves are increasingly depleting, causing a scarcity of petroleum fuel caused by the rapid progress of transportation and the manufacturing industry. This condition forces researchers to search for and develop new renewable energy source. The purpose of research is to understanding and determines role of north-south (U-S) and south-south (S-S) magnetic fields to blend waste cooking oil biodiesel-ethanol on flame evolution, flue gas emissions, and temperature during droplet combustion. Waste cooking oil biodiesel and ethanol were used in this research by adding variations in the direction of repulsive and attractive magnetic fields with an intensity of 11000 gauss. Diameter of droplets tested was 0.3 mm and was placed on a type K thermocouple wire with diameter of 0.1 mm. This research found the role of attractive magnetic field (U-S) in blend waste cooking oil biodiesel-ethanol 20% to produce the shortest flame evolution of 704 ms, lowest CO of 165 ppm, and highest temperature of 828.5 oC. This happens because ethanol has a low flash point and large oxygen content, causing the combustion reaction to occur rapidly. The attractive of magnetic field (U-S) plays a role on attracting oxygen around flame to enter combustion reaction, while the H2O resulting from combustion is pumped out of flame.
Optimasi kekuatan tarik komposit polyester diperkuat serat sisal dengan filler serbuk gergaji kayu sengon menggunakan metode respon surface Okariawan, IDK.; Fajar, M.; Hidayatullah, S.
Dinamika Teknik Mesin Vol 6, No 2 (2016): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v6i2.10

Abstract

Composite is an engineering material, which is made from combination of two or more different materials into a new material with new properties. The aim of this research is to investigate optimum composition of sisal fiber reinforced sawdust sengon filled polyester composites on the tensile strength using respon surface methodology.The testing of tensile strength is based on ASTM D 3039 standard. It has dimension 6 mm in thick, 25 mm in width and 340 mm in length. The composites are made by using compaction method. The volume fraction of sisal fiber is 25%, 30% 35%, 40% and 45%. The ratio matrik with filler is varied 5, 10, 15, 20 and 25. The fiber length is 90 mm and the direction of fiber orientation is random.The results shows that the respon surface methodology capable to search value of independent variables to give optimum values of tensile strength. The application of respon surface methodology for the research optimation composition of sisal fiber reinforced sawdust sengon filled polyester composites on the tensile strength showed that the optimum value of tensile strength response could be achieved at volume fraction of sisal fiber 38,6565% and ratio matrik with filler 24,601.
Analisis tegangan pada batang utama mekanisme bukaan payung raksasa Santoso, G.; Permana, M.S.
Dinamika Teknik Mesin Vol 7, No 2 (2017): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v7i2.165

Abstract

Spacious areas as venues for events such as weddings, gatherings, musical performances, bazaars even as parking lots, need to be protected from climate change. Therefore, it is necessary to develop the design of a giant umbrella axle mechanism measuring 12 x 12 meters with a height of 8 meters. This paper describes and stresses the stress analysis on the main bar of the giant umbrella opening mechanism. The result of modeling on the stem is presented in the form of stress contour, factor of safety (FOS), and displacement. The largest working voltage is 2 MPa in the connection area, but this voltage is still low when compared with ASTM A36 rod material structure or equivalent to SS-41 which has a yield strength of 100 MPa. The low voltage von misses are relevant to FOS values that generally reach 100 or more. The largest displacement value is in the center of the stem, which is 0.3 mm. Thus, the modeling results are able to withstand a load of 1 ton.
BENDING AFTER IMPACTKOMPOSIT SANDWICH BERPENGUAT SERAT BAMBU-FIBERGLASS DENGAN COREPOLYURETHANE RIGID FOAM Catur, Agus Dwi; Sinarep, S.; Setyawan, Paryanto Dwi; Zainuri, Achmad; Supriadi, S.
Dinamika Teknik Mesin Vol 5, No 1 (2015): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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Abstract

Impact of the composite sandwich made of materials that become defect, how defects after impact  in material need to be examined .Is that defected composites and wich still has the strength toremain in use?, then the bending after impact strength testing must be done to answer these questions.Composite sandwich with bamboo fiber-fiber glass reinforcement and with a core of 25mm rigid polyurethane foam sheet was produced. Composite sandwich made with two composite sandwich laminate as skinflanking the core. Laminated composite sandwich in this study varied number of layers of reinforcing fibers and type of fiber. Specimens subjected to drop weight impact with varying energy then defect researched and bending  after impact strengthtested. Defects formed on the composite experiencing a drop weight impact loads are: delamination, basin and through hole. The more layers of reinforcing fibers in the composite skin causing moreshallowbasinformed by theresidualimpact. The greater the impact energy causes greater depth of residual basin. Composite sandwich still has the bending strength after impact. Residual bending strength decreases with increasing impact energy imposed on the composite.
Simulasi parameter geometri regenerator mesin termoakustik Nurpatria, N.; Syahrul, S.; Pandiatmi, P.; Sayoga, I.M.A.; Mulyanto, A.
Dinamika Teknik Mesin Vol 9, No 2 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v9i2.299

Abstract

The utilization potentials of biomass energy in Indonesia is very large. As modeled in this paper, the energy carrier flue gas from biomass combustion in the form of heat and temperature is applied as thermodynamic source for the thermoacoustic engine model. Therefore, 33 different models were constructed, modified, and tested in DELTA-EC software simulation in order to reveal their capability. The performance based on the criterion of their acoustic power output and efficiency in a set of various combination of two regenerator geometry parameters applied, radial cross-sectional area and length. The simulation results show that greater the cross-sectional area, greater the acoustic power and engines efficiency. The smallest regenerator size is at 80 mm2 cross-sectional area and 54 mm length, generates acoustic power of 5.812 W with its corresponding efficiency of 0.686%. While the biggest regenerator in volume at 120 mm2 and 165 mm in size, be able to amplified acoustic power up to 22.810 W with efficiency of 2.693%. An engine model with the highest performance produces acoustic power of 25.848 W and efficiency of 3.051%. This model uses an optimal regenerators dimension with 120 mm2 area at length of 150 mm.
Perbandingan busi standar dan busi multi elektroda terhadap kinerja dan emisi gas buang pada mesin bensin Sebayang, A. H.; Ibrahim, H.; Sutrisno, J.; Nurulita, B.
Dinamika Teknik Mesin Vol 10, No 2 (2020): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i2.341

Abstract

Spark ignition in internal combustion engine was occurred from the spark of the electrode which is in the middle of the spark plug. The purpose of this study was to analyze the engine performance and exhaust emissions of a gasoline engine using standard spark plugs and multi-ground electrode spark plugs. Tests are carried out on four-stroke and four-cylinder gasoline engines without engine modification at 1500 to 4000 rpm. In addition, engine torque, brake specific fuel consumption and brake thermal efficiency and carbon monoxide (CO), carbon dioxide (CO2) and hydrocarbon (HC) emissions are measured. From the results of the study, an increase in torque and power using a four-foot electrode spark plug by 0.599% was accompanied by an increase in the consumption of specific fuels 266.78 g/kWh compared to standard spark plugs. In addition, it was found that CO and HC emissions decreased, although CO2 emissions increased compared to the use of standard spark plugs. Based on the results of the study, it can be concluded that the use of multi-ground electrode spark plugs can increase engine power and torque and reduce exhaust emissions.
PENGARUH PANJANG SERAT DAN FRAKSI VOLUME TERHADAP KEKUATAN IMPACT DAN BENDING MATERIAL KOMPOSIT POLYESTER- FIBER GLASS DAN POLYESTER-PANDAN WANGI Sulistyowati, Emmy Dyah; Sari, Nasmi Herlina; Yudhyadi, IGNK; Sinarep, S.; Topan, T.
Dinamika Teknik Mesin Vol 2, No 1 (2012): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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

Abstract

At this research by using two kinds of composite that is composite of fibre of screw pine of fragrant and composite of glass fibre. And in doing research will be done by two examination type that is test the strength bending and test the strength impact. How strength from two composite type of examinee with the long variation  and fibre volume to be used.As the result test the strength of impact and bending to be composite of screw pine of fragrant with the long variation of fibre with the random fibre direction that composite highest strength impact of fibre of screw pine of fragrant got at fibre length 5 cm of equal to 2286,67 singk / m². while for the variation  of volume of highest strength impact fibre there are at fibre volume 40% with the unidirectional fibre direction equal to 2940 Kj / m². While to result of composite strength bending test of screw pine of fragrant got by biggest strength bending with the long variation of fibre with the direction of fibre random, gotten at fibre length 5 cm of equal to 146,67 KN . while for the strength of bending with the variation of fibre volume with the unidirectional fibre direction, highest strength bending got at fibre volume 40% equal to 236,67 KN. Medium to result of composite strength impact test of glass fibre at long variation of highest strength fibre got at length seart 5 cm of equal to 5553,33 Kj / m². While strength impact with the variation of biggest strength fibre volume at fibre volume 40% with the unidirectional fibre direction equal to 15908,67 Kj / m². Medium at composite strength bending test of glass fibre with the long variation of fibre  where fibre direction is random of biggest kerkutan bending at fibre length 5 cm of equal to 263,33 KN. while to result of kekutan bending  at variation  of fibre volume got by biggest strength bending at fibre volume 40% equal to 278,34 KN.

Page 35 of 46 | Total Record : 452

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