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Teknomekanik

teknomekanik
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Published by Universitas Negeri Padang

ISSN : 26219980 EISSN : 26218720 DOI : 10.24036/tm.

Core Subject : Engineering,

Mechanical Engineering

Teknomekanik is an international journal that publishes peer-reviewed research in engineering fields (miscellaneous) to the world community. Paper written collaboratively by researchers from various countries is encouraged. It aims to promote academic exchange and increase collaboration among scientists, engineers and researchers to support sustainable development goals.

Arjuna Subject : Teknik (semua kategori) - Teknik Mesin

Articles 70 Documents

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An Analysis of Slip Incidence for Ankle Angle and Muscle Fatigue During Walking Activities Sharifah Aznee Syed Ali; Seri Rahayu Kamat; Momoyo Ito
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

Human walking speed exposes the higher potential to slip accident especially walking on the oily surface. Prolong walking during working will develop fatigue to the leg and certain body part. In a certain industry, there was a need that worker had to walk and standing in prolong before reaching their break. The aim of this study was to analyze the ankle angle and the muscle fatigue during walking and influence in slip incident. The study involves twelve health participants aged from 23 to 57 years old with a mean of BMI was 27.82 ± 4.01 kg/m2. The procedure will be explained the detail when the participant agreed. Vicon motion capture was used to record movements and the Electromyography (EMG) was used to record muscle fatigue activity. The finding shows that the slip occurred frequently for overweight and obese participants. The female participant experience slips more than a male participant. The range of ankle angle during slip was from 97.2 ± 6.7° for male participants and 112.5 ± 12.7° for female participants. The muscle Soleus and Tibialis were producing high muscles fatigue during slip occurrence. The results of the study show that muscle fatigue was significant with the occurrence of slipping during walking speed. Other findings presented that overweight and obese participants' significant slip occurred when walking on oily surfaces. Both aged groups represent the slip occurrence, there was no significant factor of aged during slip occurrence.

Utilization of Sewage Sludge Using Multiple Thermal Conversion Processes Ta-Hui Lin; Annas Fauzy; Guan-bang Chen; Fang-Hsien Wu
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

Sewage sludge is a usual waste from urban areas that can be utilized in many renewable energy sources. In this study, we examine the sewage sludge utilization using pyrolysis process to produce pyrolytic oil using Taguchi methods, combustion characteristic of sludge pyrolytic oil (SPO) blend with heavy fuel oil (HFO), and co-gasification of sewage sludge with CO2/steam as the gasification medium using Taguchi methods. The best-operating conditions for the pyrolysis of sewage sludge are a heating rate of 10oC/min, temperature of 450oC, the residence time of 60 min, and N2 flow rate of 700 mL/min. Under these conditions, the obtained pyrolytic oil yield is very close to the result from the Taguchi method calculation. In the combustion characteristic of sludge pyrolytic oil (SPO) blend with heavy fuel oil (HFO), a higher SPO in the fuel blend enhances the occurrence of micro-explosion and reduces the size of the residual. Higher SPO content in the fuel blend increases the combustion rate and increases the ignition delay due to moisture evaporation. In the co-gasification of sewage sludge and palm kernel shell optimization using Taguchi method, the best operational condition for maximum H2/ CO syngas ratio reaches at the gasification temperature of 900 C, a blending ratio of 30%, a CO2/(CO2+H2O) ratio of 70%, and a catalyst addition of 20% bed material mass. The best operating condition for maximum concentration of H2 reach with gasification temperature of 800 C, a blending ratio of 40%, a CO2/(CO2+H2O) ratio of 70%, and a 15% catalyst addition of bed material mass. The CO2/(CO2+H2O) ratio is the most important parameter among both case.

Development and Implementation of Innovative Technologies That Ensure an Increase in The Extraction of Non-ferrous, Noble, Rare, Rare-Earth Metals Bagdaulet Kenzhalievich Kenzhaliyev; Kvyatkovskiy Sergey Arkad’yevich; Trebukhov Sergey Anatolyevich; Rinat Anvarbekovich Abdulvaliyev; Aigul Koizhanova; Nessipbay Kuandykovich Tussupbayev; Sergey Vladilenovich Gladyshev; Gulzhaina K. Kassymova
Teknomekanik Vol 5 No 1 (2022): Teknomekanik
Publisher : Universitas Negeri Padang

The article presents the most innovative technologies developed by Satbayev University, "Institute of Metallurgy and Ore Beneficiation" JSC (Republic of Kazakhstan, Almaty) in recent years. The implementation of these works on an industrial scale will lead to significant economic and environmental effects. The following technologies are described: synthesis of a new foaming agent for intensification of flotation enrichment of gold-bearing ores; multicomponent microflotation, which allows to increase the extraction of valuable metals at existing deposits and to develop new, relatively poor and previously economically unpromising deposits; flotation enrichment of persistent gold-containing ore; contractile pyrometallurgical selection, which allows direct melting of persistent gold-containing raw materials with the transfer to the gas phase of arsenic, sulfur and other volatile components, followed by their neutralization and concentration of gold, silver and other non-ferrous metals in matte melt; continuous conversion of copper matte in the Vanyukov furnace; processing of liquid metallurgical slags in a furnace with an electrically heated coke filter; vacuum distillation refining of rough selenium; extraction of rare earth metals from extraction phosphoric acid obtained during the processing of phosphorites; processing of high-grade low-quality bauxite.

The Effect of Current Strength Towards ABREX Steel 400 Pulling Strength by Using SMAW Welding with Electrode E7018 Muhammad Rizki; Nelvi Erizon; Budi Syahri; Rodger Eliab jr
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

The aim of this study is to determine the effect of variations in welding current strength on the tensile strength of ABREX 400 steel weld joints. The results of this study are expected to give contribution toward the world of metal welding, especially low carbon steel metal welding which will later be beneficial for the development of the metal industry and technology. The method used in this research was the experimental method. In addition, the process of welding the material used SMAW welding and the type of seam V connection and the variations in the current strength used are 90 A, 100 A, and 110 A. The specimen used was a TRS 400 low carbon steel plate with a thickness of 10 mm and the electrode used was the E7018 electrode Ø 3.2 mm. The standard specimen used was ASTM-8 and the test was carried out using the Universal Testing Machine tensile test device. As a result, the research showed that the tensile strength at a current of 90 A was 588.91 N / mm2, a current of 100 A was 570.56 N / mm2, and a current of 100 A was 545.17 N / mm2. Based on the results of the research, it can be concluded that welding using a current strength of 90 A produces the highest tensile strength value, namely 588.91 N / mm2 compared to currents of 100 A and 110 A.

The Effect on Using Different Types of Electrodes toward the Tensile Strength of the Welding Joints Groove V Low Carbon Steel Type DIN 1.0038 Yogi Fernando; Rodesri Mulyadi; Ambiyar Ambiyar
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

The choice of electrode type in welding will affect the strength of the welding result. The aim of this study was to determine the effect on using different type of electrode on the tensile strength of low carbon steel type 1.0038 by using experimental method. The welding was conducted using Groove V. In addition, the specimens used in this research were the low carbon steel plate type 1.0038 with a thickness of 8 mm and were given SMAW treatment using 2 different types of electrodes, namely E 6013 and E 7016 whose diameters were 2.6 and 3.2 mm. The standard specimen used was ASTM-E8 and being tested using a Universal Testing Machine. Based on the research that had been conducted, it was obtained that the steel type 1.0038 welded using E 7016 electrodes had a higher tensile strength than the one using E 6013.

The Effect of Cast Iron Preheating on the Microstructure of Welding Results by Using Cin-2 Electrodes Ahmad Sabirin; Purwantono Purwantono
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

Cast iron is commonly found in engineering tools such as machine frames, vise, lathes, planers, pressing tools, V-belt pulleys and others. Cast iron is a metal which is relatively difficult to weld because it contains more than 0.3% carbon. As a matter of fact, a lot of welding workers still experience failure in welding the cast iron, so they require the proper procedures to perform welding on the cast iron like the heat treatment before the welding. This study was aimed at obtaining the effect of preheating variations on the weld joints in which the process of welding the material used the type of open V seam connection. The specimen used was a cast iron with a thickness of 10 mm and the electrode used was the JIS Z 3252 DFCNiFe electrode. The method applied in this research was the microstructure observation testing toward the welding result by using Shielded Metal Arc Welding (SMAW). Based on the results of the study, it can be concluded that by applying the preheating variation treatment on the cast iron welding, there was a change in the microstructure and it was dominated by pearlite-ferrite in the weld metal area. As a result, the rough graphite that looks like roots became smooth after experiencing the preheating treatment because the ferrite was evenly distributed in the heat affected area. To conclude, the most superior specimen for the cast iron preheating among the four specimens was the one with 425oC temperature.

The Effect of AC (alternating current) and DC (direct current) on Bend Testing Results of Low Carbon Steel Welding Joints Zetri Firmanda; Abdul Aziz; Bulkia Rahim
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

The purpose of this study was to determine the effect of alternating current (AC) and direct current (DC) on the bend testing results of low carbon steel welding joints. The results of this study are expected to determine the cracks that occur from the root bend and face bend testings in the AC and DC welding process. This study used experimental method, where the research was done by giving AC and direct polarity DC (DC-) SMAW welding treatments. The material used in this research was low carbon steel plate DIN 17100 Grade ST 44, thickness 10 with E7016 electrode type. The process of welding joints used a single V seam, strong current of 90A, and the welding position of 1G. The testing of welding joints was carried out by bend testing using the standard acceptance of AWS D1.1 root bend and face bend testing results. The results of the bend testing showed that the AC welding root bend test specimen held no cracks while the DC welding root bend test held cracks with incompelete penetration and open crack defects. On the contrary, the AC welding face bend test had open crack defects and in the DC welding face bend test was found a crack. Thus, there was a difference in the crack resistance of the welding joint from the types of current used through the root bend test and face bend test. Therefore, it can be summarized that AC welding is better for root welding and DC welding is good for capping welding.

The Effect of Cooling Media on Tensile Strength of Medium Carbon Steel in Post Welding Process Using Electric Welding (SMAW) with E7018 Electrodes Herman Zulhafril; Jasman Jasman; Kimberly June Tespoer
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

The use of cooling media in post welding process will affect the tensile strength of a material. This study aims to determine how much the influence of using cooling media in post welding and which cooling media is appropriate to use. The process is done by comparing the tensile strength of each cooling media, namely the cooling media of water, air, and coolant. The use of cooling media is carried out after the welding process, until the material that is ready to be welded reaches room temperature. Based on the experiments that have been conducted, the use of post-welding cooling media affects the tensile strength of medium carbon steel with the highest effect on the water cooling media, then the coolant media, and the lowest is the air cooling media. Therefore, the choice of the use of cooling media significantly affects the tensile strength of medium carbon steel in the post-welding process.

The Effect of Preheating and Non-Preheating in Cast Iron Welding Toward Mechanical Properties Fauzan Sauri; Mulianti Mulianti
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

Cast iron material is a material that has brittle properties and is less able to withstand stress due to the welding cycle caused by flake graphite in cast iron. Because of these problems, in connecting cast iron materials using the SMAW welding method, it is necessary to have heat treatment (preheating) to avoid the welding problems on the properties of cast iron. The purpose of this study is to determine the effect of heating and non-heating on the cast iron before the welding process. Therefore, this research will play a crucial contribution as a reference for cast iron welding researchers and cast iron welding process. The method of the research was experimental research, where the measurement results were obtained directly from the specimens. The welding was using an open V seam. The specimen used was cast iron with a thickness of 8 mm. One cast iron was given heat treatment at a temperature of 260ºC and the others did not receive heat treatment before being welded. The welding process used SMAW with CIN - 2 electrodes with a diameter of 3 mm. The test used the bending test on the face specimens according to the American Welding Society D1.1 standard. The results showed that there was an effect of the preheating treatment on cast iron, which that the non-preheating specimens were easier to fracture than the preheating specimens. Thus, it can be concluded that welding with preheating is better than welding without preheating.

Stability Study of Flat Hull Ship for Fishing Tourism Rahmat Azis Nabawi; Syahril Syahril; Salmat Salmat
Teknomekanik Vol 3 No 2 (2020): Teknomekanik
Publisher : Universitas Negeri Padang

The availability of boats is needed to develop fishing tourism. Most of the boats used so far generally use fishing boats made of woodcut in the forest, so this can damage the environment and cause natural disasters. Ships using a flat plate hull made of steel can be a substitute for wooden ships. This study aims to test the stability of a flat plate vessel designed for fishing boats. The ship stability test was carried out using a computer simulation method using Maxsurf Stability software. The ship stability criteria refer to the International Maritime Organization code A.749 (18), Ch 3-design criteria applicable to all ships. The ship stability analysis was carried out on two variations of the load case. The value of GZ at A h 300, A h 400 and A h 300 - A h 400 for load case 1 and 2 are greater than the minimum standards determined by IMO. The maximum GZ value at load case 1 occurs at an angle of 400 and at load case 2 at an angle of 60.90. The GM value in load case 1 is 0.609 meters and in load case 2 is 0.485 meters. Based on the results of the tests that have been carried out, it can be denied that the flatboat design model for fishing tourism meets the criteria set by the International Maritime Organization.

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Rahmat Azis Nabawi

Contact Email raazna@ft.unp.ac.id

Phone +6281277328670

Journal Mail Official Syahril@ft.unp.ac.id

Editorial Address Jl. Prof. Dr. Hamka Kampus UNP Air Tawar

Location Kota padang, Sumatera barat INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Rahmat Azis Nabawi

Contact Email
raazna@ft.unp.ac.id

Phone
+6281277328670

Journal Mail Official
Syahril@ft.unp.ac.id

Editorial Address
Jl. Prof. Dr. Hamka Kampus UNP Air Tawar

Location
Kota padang,

Sumatera barat

INDONESIA