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All Journal REKAYASA Turbo : Jurnal Program Studi Teknik Mesin Mechanical Engineering for Society and Industry Automotive Experiences Jurnal Teknik Mesin Mechanical Xplore Teknologika SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Jurnal Polimesin
Shieddieque, Apang Djafar
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Analisis Material Efoxy EF150K Terhadap Temperatur dan Kelembaman Tinggi Pada Komponen Charger Mobil Listrik Shieddieque, Apang Djafar; Abdulah, Amri; Rajab, Dede Ardi; Jatira, Jatira; Rag, Yoon Jung; Kil, Sohn Chang; Kurnia, Tata
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10244

Abstract

Electric cars have now been made and developed by famous car manufacturers outside of Indonesia. Of course electric cars have batteries that must be recharge. Inside the electric car charger there is a controller which is one of the components, which is an epoxy coated capacitor. The faster the charger, the higher the temperature will be, to deal with this problem, it is necessary to increase the performance of the capacitor to increase the temperature and humidity resistance. Then from this explanation the researchers will test the EF150K epoxy coating on the Disc Ceramic Capacitor (DCC), by using epoxy coating thickness testing by using 3 samples the results obtained are on average 0.8 mm, Pressure Cycle Test (PCT) using 20 samples with  conditions temp: 121 °C, p: 2 bar for 48 hour, obtained average capacities and insulance resistance before PCT testing C: 2155,4pF, IR: 141540Ω and after C: 2238,2 pF, IR: 147140 Ω, and humidity test using 20 sample with condition 95% RH, temp: 40°C for 504h obtained average capacities and insulance resistance before humidity test C: 2.157,89 pF, IR: 119560 Ω and after C: 2.233,63 pF, IR: 123160 Ω. The use of EF150K epoxy is very well used as a DCC capacitor coating, because the coating is resistant to temperatures up to 121 ° C with a pressure of 2 bar, and withstands temperatures up to 40 °C with 95% RH. 
Pengaruh Variasi Campuran Bentonit Terhadap Karakteristik Pasir Cetak Untuk Proses Sand Casting Apang Djafar Shieddieque; Ismail Putra Nugraha; Mochammad Iqbal Zaenal Muttahar; Ghany Heryana
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16194

Abstract

The casting process is widely used because it has the advantage of being able to make products with small dimensions to very large dimensions, the use of materials is more efficient, the casting products can be directly used. However, in the casting process, the main triggers for the formation of defects are the nature of the mold, low permeability, low molding compressive strength, low sintering point, unsuitable sand grain distribution, so research is needed to obtain the right type of molding sand as a sand mold in metal casting. The only type of additive is bentonite. Bentonite can absorb water and expands between 8-15 times and remains dispersed in water for a certain period of time. This study aims to examine the effect of a mixture of variations of local bentonite and Australian bentonite on the characteristics of the molding sand for the sand casting process. The tests carried out are in the form of size distribution testing, X-Ray Diffraction, water content testing, compressive strength, and permeability measurements. Bentonite was varied into 5 variations of the mixture with a difference of 20% in each mixture. The results of the large size distribution of silica sand grains were 37.6 GFN. The results of XRD testing of local bentonite showed a higher content of calcium compounds and Australian bentonite contained higher sodium compounds. The largest water content test value is 5.825%. The largest compressive strength test value is 2.7 Kgf /cm2.
Optimasi Parameter Proses Resistance Spot Welding pada Pengabungan Beda Material SPCC Syahri Tua Pasaribu; Sukarman Sukarman; Apang Djafar Shieddieque; Amri Abdullah; Rohman Rohman
SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Vol 1 (2019)
Publisher : SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1067.723 KB)

Abstract

Makalah ini menyajikan ikhtisar optimasi parameter proses resistance spot welding menggunakan logam SPCC-SD (JIS 3141) beda ketebalan sehingga perlu ketepatan seting parameter resistance spot welding. Penelitian ini  bertujuan untuk mendapatkan hasil uji tegangan tarik geser tertinggi dari kombinasi parameter resistance spot welding yang ditetapkan. Penelitian ini menggunakan metode Taguchi dengan menggunakan empat parameter dan tiga level eksperimen. Hasil uji tegangan tarik geser tertinggi sebesar 4,91 kN dan terendah adalah 4,12 kN. Hasil uji tarik geser tertinggi didapatkan pada kombinasi welding current 37 kA, welding time 6 cycles, holding time 15 cycles, dan squeeze time 22 cycles.
Optimasi Parameter Proses Resistance Spot Welding pada Pengabungan Material SECC-AF Edi Gunawan; Sukarman Sukarman; Apang Djafar Shieddieque; Choirul Anwar; Jatira Jatira
SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Vol 1 (2019)
Publisher : SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1202.571 KB)

Abstract

Makalah ini menyajikan ikhtisar optimasi parameter proses resistance spot welding menggunakan logam SECC-AF (JIS G 3313). Material SECC-AF (JIS G 3313) merupakan plat lembaran SPCC (JIS 3141) yang dilapisi zinc dengan ketebalan tertentu sehingga sifat mampu lasnya (weld ability) menurun.  Penelitian ini bertujuan untuk mendapatkan hasil uji tegangan tarik geser tertinggi dari kombinasi parameter resistance spot welding yang ditetapkan. Penelitian ini menggunakan metode Taguchi dengan menggunakan empat variabel dan kombinasi 4-2 tingkat eksperimen. Hasil uji tegangan tarik geser tertinggi sebesar 4,66 kN dan terendah adalah 3,88 kN.
Enhancing TIG Welding Parameters For Direct Tensile Load (DT-load) On Various Steel Thicknesses Amar Amar; Sukarman Sukarman; Khoirudin Khoirudin; Dodi Mulyadi; Arul Basit; Ade Suhara; Apang Djafar Shieddieque; Tegar Dwi Cahyo
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4892

Abstract

The car body repair process is integral to vehicle development and structural repair. The primary objective of this study is to enhance the quality of thin material welding utilized in automobile body repair. The impetus for this research stems from the necessity to improve the structural integrity and longevity of thin materials prone to deformation throughout the welding procedure while minimizing distortion. This study aims to identify optimal parameters for the tungsten inert gas welding (TIG welding) process on thin materials, particularly for automobile body rearrangement. The Taguchi method conducted the experimental analysis of variations in welding parameters, including electrode diameter, gas flow rate, and welding current. Adjusting TIG welding parameters to their optimal values significantly improves weld joint direct tensile load (DT-load) and overall structural quality, according to the findings of this study. ANOVA analysis and the S-N ratio indicate that gas flow rate and welding current are significant determinants of the quality of welded joints in thin materials. This research contributes to a better understanding of the optimal parameters for fusing thin materials, particularly in automobile body repair. The automotive industry can use these findings as a guide to enhance the quality and strength of welding processes, which are critical to the structural integrity of vehicles.
Recent Development in LiFePO4 Surface Modifications with Carbon Coating from Originated Metal-Organic Frameworks (MOFs) to Improve the Conductivity of Cathode for Lithium-Ion Batteries: A Review and Bibliometrics Analysis Shieddieque, Apang Djafar; Rahayu, Iman; Hidayat, Sahrul; Laksmono, Joddy Arya
Automotive Experiences Vol 6 No 3 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9524

Abstract

Using lithium-ion batteries has emerged as a viable approach to lessen the negative effects of fossil fuel use. LiFePO4 (LFP) is one of the lithium-ion batteries that are eco-friendly and safer than others. However, LFP has a main limitation with the poor rate performance due to its low electronic conductivity number. This study aims to present a bibliometric review of the analysis using VOSviewer of surface modification using carbon coating of metal-organic frameworks (MOFs) to improve the challenge of synthesis, structure, electrochemical stability, and performance of LFP. The results of this study showed that surface modification of LiFePO4 electrodes using carbon compounds produced from MOFs improved the efficiency of electrochemical energy storage and conversion technologies. High levels of porosity and customizable characteristics are offered by metal-organic frameworks (MOFs) ideal for surface modification which improves the battery conductivity. The bibliometric analysis showed that research on lithium-ion batteries is currently receiving attention, a sign of its significance and rising popularity. It is suggested for researchers especially Indonesian researchers to contribute more to this field.
Improving Dissimilar Metal Joining Quality Through Shielded Metal Arc Welding: A Taguchi Optimization Strategy Supriyanto, Agus; Sukarman, Sukarman; Mulyadi, Dodi; Djafar Shieddieque, Apang; Abdulah, Amri; Khoirudin, Khoirudin
Jurnal Teknik Mesin Mechanical Xplore Vol 5 No 1 (2024): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v5i1.7867

Abstract

The results of an experiment that used an orthogonal Taguchi method to improve shielded metal arc welding (SMAW) were given. The SMAW method was used to join dissimilar metal of SPHC and St. 30. SPHC material has a low carbon steel content, while St. 30C steels contain a medium amount of carbon steel, which is used for tractor shaft axles. Carbon percentages vary slightly between the two substances. This study aimed to achieve the highest possible quality of tensile strength by utilizing the specified SMAW parameters. SPHC material has a low carbon content, whereas St. 30 steel has a moderate carbon content. This study used the Taguchi experimental method with three input variables and three experimental levels. The SNR ratio is used to evaluate the most optimal SMAW performance. ANOVA analysis is used to evaluate the most crucial parameters in determining the response variable. This research has successfully provided input on the combination of SPHC and St. 30C for SMEs. It operates effectively with a welding current of 133 A, a welding voltage of 9 V, and a filler diameter of 2.0 mm. The S/N ratio analysis found that the welding current, voltage, and filler diameter all had a significant impact on the outcome.
PENGARUH VARIASI MEDIA QUENCHING TERHADAP KEKERASAN DAN STRUKTUR MIKRO MATERIAL PADUAN Al-Si-Cu-Fe Shieddieque, Apang Djafar
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3383

Abstract

meningkatnya tuntutan efisiensi energi dan material yang ringan namun kuat adalah tantangan utama yang dihadapi untuk meningkatkan kekuatan aluminium tanpa mengorbankan sifat-sifat unggul lainnya. Hal ini didukung dengan sifat mekanik dari alumunium yang sudah dimodifikasi. Setiap metode memiliki efek yang berbeda terhadap sifat mekanis dan mikrostruktur aluminium, sehingga pemahaman mendalam tentang teknik penguatan sangatlah penting. Proses perlakuan panas (Heat treatment) digunakan untuk meningkatkan sifat mekanik aluminium, seperti kekuatan dan keuletan. Parameter seperti suhu, waktu pemaparan, dan laju pendinginan mempengaruhi hasil akhir dari Heat treatment. Tujuan dari penelitian ini adalah mengetahui pengaruh variasi media quenching terhadap perubahan struktur mikro dan kekerasan paduan Al-Si-Cu-Fe. Pengujian yang dilakukan berupa pengujian kekerasan dan pengamatan metalografi. Dari hasil penelitian didapatkan bahwa perlakuan panas quenching dengan perbedaan variasi media quenching cenderung mempengaruhi tingkat kekerasan Al-Si-Cu. Dari hasil pengujian kekerasan, nilai rata-rata kekuatan tertinggi didapatkan dengan media quenching air sebesar 75,484 BHN. Variasi media pendingin akan merubah struktur mikro melalui penyebaran partikel Si dan morfologi partikel Si. Hasil pengujian kekerasan dan hasil pengamatan struktur mikro spesimen dengan media quenching air memiliki struktur mikro dengan bentuk partikel Si paling halus dan penyebaran partikel Si yang banyak sehingga tingkat kekerasan pada spesimen dengan media pendingin air paling tinggi.
Development of hybrid nanofluids and solar heat exchangers (SHX) to improve heat transfer performance in solar panel cooling Abdulah, Amri; Shieddieque, Apang Djafar; Rajab, Dede Ardi; Khoirudin, Khoirudin; Sukarman, Sukarman
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12913

Abstract

This study examined the thermohydraulic efficiency of a novel Solar Heat Exchanger (SHX) designed for cooling solar panels. The SHX was specifically created for 20 Wp solar panels measuring 450 × 350 mm. The cooling medium was a hybrid nanofluid (HNF) consisting of Al₂O₃ and SiO₂ nanoparticles (0.5–1%) suspended in a base fluid of ethylene glycol and water (EG/W) at a 10:90 ratio. Experiments were performed using flow rates ranging from 1 to 3 LPM. The HNF coolant demonstrated enhanced performance in the solar heat exchanger, with a maximum heat transfer rate increase of 56.07% compared with that of the base fluid. This improvement in the heat-transfer rate was associated with an increase in the heat-transfer coefficient, which was influenced by the flow rate and volume fraction of the HNF. The effectiveness of the HNF surpassed that of the base fluids by approximately 117%. The results indicated that higher flow rates and volume fractions improved cooling performance. The enhanced cooling efficiency and innovative SHX design make this study particularly relevant to the development of solar panel cooling systems, particularly those employing hybrid nanofluid coolants.
Pengaruh Variasi Holding Time pada Proses Single Stage Aging Terhadap Kekerasan dan Mikrostruktur pada Material Paduan Al-Si-Cu-Fe Shieddieque, Apang Djafar; Kuswandi, Rendi
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.26678

Abstract

The Al-Si-Cu aluminum alloy is the most commonly used alloy for household appliances, aircraft materials, automotive, marine vessels, construction, and more. However, cast aluminum alloys still exhibit low mechanical properties, necessitating additional processes to enhance their strength. One method of strengthening aluminum is by varying the composition and/or heat treatment process. The aim of this research is to investigate the effect of aging time variation on the microstructure and hardness of the Al-Si-Cu-Fe alloy. The heat treatment processes conducted in this study include solid solution treatment (T=540°C and t=5 hours) and various single-stage aging treatments (T=155°C and t=4, 5, and 6 hours). Mechanical properties of the aluminum alloy were evaluated through metallographic observations and Brinell hardness testing. Microstructural observations indicate changes in the Silicon microstructure from the As cast sample, which exhibits dendrites, to the formation of AlSi and AlFeSi phases after aging treatment. With longer aging treatments, larger and more dispersed precipitate grains are formed. The variation in holding time has different effects on hardness, with the highest hardness obtained at a holding time of 4 hours during artificial aging, resulting in 71.57 BHN. However, increasing the holding time tends to decrease hardness due to the growth of larger precipitate phases.
Co-Authors Ade Suhara Agus Solehudin Agus Supriyanto Amar Amar Amri Abdulah Amri Abdullah Ardi Rajab, Dede Arul Basit Choirul Anwar Dodi Mulyadi Edi Gunawan Ghany Heryana Heryadi, Yadi Iman Rahayu Hidayati Soesanto Ismail Putra Nugraha Jatira Jatira Jatira Joddy Arya Laksmono Khoirudin Khoirudin Khoirudin Khoirudin, Khoirudin Kil, Sohn Chang Kurnia, Tata Kuswandi, Rendi Mochammad Iqbal Zaenal Muttahar Rag, Yoon Jung Rahdiana, Nana Rajab, Dede Ardi Rohman Rohman Sahrul Hidayat setiawan, Dibyo Sukarman Sukarman Sukarman Sukarman Sukarman Sukarman Suripto, Heri Syahri Tua Pasaribu Tegar Dwi Cahyo Wilman Adi Nugraha Wilman