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Journal : Vortex

 1 
PENGARUH KOMPOSISI SKIN TERHADAP KEKUATAN BENDING PADA KOMPOSIT SANDWICH SERAT AREN-POLYESTER DENGAN SERBUK KAYU SENGON-POLYESTER Nugroho, Fajar; Ahmadi, Nurfi
Vortex Vol 4, No 1 (2023)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v4i1.1425

Abstract

Komposit sandwich adalah jenis komposit yang mempunyai kekuatan tinggi apabila digunakan sebagai struktur primer maupun sekunder. Komposit juga memiliki kelebihan dari sifat mekaniknya, tahan korosi, massa jenis yang kecil dan proses pembuatannya yang sederhana. Penelitian ini bertujuan untuk menyelidiki pengaruh variasi fraksi volume lapisan kulit serat aren dengan inti limbah gergaji kayu sengon laut terhadap kekuatan bending komposit sandwich bermatriks polyester. Bahan penelitian ini adalah serat aren, unsaturated polyester resin 157 BQTN-EX, serbuk limbah gergaji kayu sengon laut dan urea formaldehide. Spesimen ini dibuat dengan metode cetak tekan dengan tebal skin (2 mm) dan tebal core (10 mm). Pengujian bending komposit sandwich ini mengacu pada standar ASTM D-790-03. Metode yang digunakan dalam proses pembuatan komposit ini adalah metode hand lay up.Hasil penelitian menunjukkan nilai kekuatan bending mengalami kenaikan dari variasi fraksi volume 20% : 80% ke variasi fraksi volume 40% : 60%, dengan nilai tegangan lentur maksimum tertinggi 54,87 N/mm2 pada variasi fraksi volume 40% : 60%. Berdasarkan hal ini dapat diketahui bahwa seiring penambahan serat maka turut mempengaruhi nilai tegangan yang dihasilkan. Hasil pengujian morfologi pada variasi 30% : 70% ditemukan adanya void atau pori-pori di sekitar permukaan spesimen.
Analysis of the influence of groove welds of oxy-acetylene welding joints on tensile strength and microstructure on steel ST 37 Nugroho, Fajar; Muga, Yohanes Fernando Leo; Setiabudi, Dedet Hermawan; Sudarmanto, Sudarmanto
Vortex Vol 5, No 1 (2024)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v5i1.1955

Abstract

In this study, the authors conducted a study on the analysis of the effect of oxy-acetylene welding joints on tensile strength and microstructure in the HAZ and weld metal areas on st 37 steel plates. The results of this study indicate that the average value of the highest tensile strength value is at V groove weld with the average strength of the welded joint is 4.796 kgf/mm2. While the lowest tensile stress is on the I groove weld of 4.674 kgf/mm2. Meanwhile, from the microstructure test, it can be seen that in the HAZ area each groove. Microstructure in the HAZ area shows that the double V groove  weld types are fine ferrite, coarse pearlite and martensite. In type V groove  weld the structures formed are ferrite, coarse pearlite and martensite. In type I groove  weld the structures formed are ferrite, grain boundary ferrite and fine pearlite. Whereas in the weld metal area, and the results of the microstructure test of the weld area on the V seam, it shows a dense microstructure arrangement, the arrangement is identical to pearlite (dark color) so that the specimen is harder.
PENGARUH KECEPATAN FEEDRATE FRICTION STIR WELDING (FSW) TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO PADA ALUMINIUM PADUAN AA 2024-T3 Nugroho, Fajar; Ahmadi, Nurfi; Hidayat, Sarif
Vortex Vol 3, No 2 (2022)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (494.289 KB) | DOI: 10.28989/vortex.v3i2.1265

Abstract

Friction stir welding (FSW) adalah suatu teknologi pengelasan yang merupakan proses solid-state joining yang bisa digunakan untuk menyambungkan material aluminium dengan mampu las yang rendah. Proses FSW memanfaatkan putaran dari tool yang menggesek dua buah lempengan logam yang akan disambung. Aluminium 2024 T3 dengan ketebalan 4 mm disambung menggunakan proses FSW dengan variasi feedrate yang digunakan 13 mm/menit, 15 mm/menit, dan 25 mm/menit, kecepatan putaran spindle 910 rpm dan kedalaman pin 3 mm. Pengujian yang dilakukan adalah pengujian tarik, kekerasan dan uji struktur mikro pada masing-masing variasi pengelasan.Hasil penelitian menunjukkan bahwa kekuatan tarik dan regangan tarik tertinggi terjadi pada pengelasan dengan feedrate 25 mm/menit sebesar 221,51 MPa dan 3,60. Kemudian kekuatan tarik dan regangan tarik terendah terjadi pada pengelasan dengan feedrate 13 mm/menit sebesar 198,63 MPa dan 2,26. Nilai kekerasan tertinggi di area nugget zone dihasilkan pada pengelasan dengan feedrate 25 mm/menit yaitu sebesar 137 VHN dan nilai kekerasan terendah dihasilkan pada pengelasan dengan feedrate 13 mm/menit yaitu sebesar 105 VHN. Hasil foto struktur mikro pada area nugget zone dan TMAZ (Thermomecanically Affected Zone) mengalami perubahan seiring dengan berubahnya feedrate.
PENGARUH POSISI SHIELDED METAL ARC WELDING (SMAW) GERAK SPIRAL KAMPUH V TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO BAJA KARBON RENDAH Ahmadi, Nurfi; Nugroho, Fajar; Ahmad A, Dadang
Vortex Vol 4, No 1 (2023)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v4i1.1320

Abstract

The purpose of this study was to determine the relationship between the position of shielded metal arc welding (SMAW) with spiral motion V on the tensile strength and microstructure of low carbon steel. The research was conducted by welding V-coated low carbon steel with horizontal 2G, vertical 3G and overhead 4G. The test results show that the welding position does not have a significant effect on the tensile strength of low carbon steel welds, where the 3G vertical position provides a higher tensile strength value than the 2G horizontal position and 4G overhead. The microstructure of acicular ferrite (AF) in the vertical position looks dominant uniformly and tightly.
Structural Design Optimization of Bellcrank 3 in the N219 Aircraft Flap Flight Control System Using the Finite Element Method Hartini, Dwi; Bachtiar, Muhamad Irfan; Nugroho, Fajar; Anna Prattiwi, Elisabeth Anna; Santoso, Djarot Wahju
Vortex Vol 7, No 1 (2026)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v7i1.3819

Abstract

The flap control system is a critical subsystem in aircraft that directly affects aerodynamic performance and flight safety. One of the key mechanical components in this system is the bellcrank, which functions to transmit and redirect loads from the actuator to the flap mechanism. In this study, structural optimization of bellcrank 3 in the flap control system of the N219 aircraft was performed using the Finite Element Method (FEM). Three design configurations were analyzed, namely the base model, optimization model 1 with thickness reduction, and optimization model 2 with the addition of holes in non-critical areas. Structural evaluation was conducted based on mass reduction, displacement, von Mises stress, and margin of safety (MS). The simulation results show that both optimization approaches successfully reduce structural mass compared to the base model. Optimization model 1 achieves the largest mass reduction but results in higher stress levels and lower margin of safety. Optimization model 2 provides a more balanced structural performance, with stress, displacement, and margin of safety values comparable to the base model while maintaining mass reduction. All analyzed configurations exhibit positive margin of safety values, indicating that the structures remain safe under the applied operational loads. Based on the overall structural performance, optimization model 2 is considered the most suitable design for application in the flap control system of the N219 aircraft.
Co-Authors abdul haris subarjo, abdul haris Adya Hermawati Agamuddin, Agri Americo Ahmad A, Dadang Ahmadi , Nurfi Albar, Muhammad Rafi Among Herahli Ana Sopanah, Ana Andrano, Reza Anisya Anisya Anna Prattiwi, Elisabeth Anna Anzani, Luthfi Arman A Arman A, Arman A Bachtiar, Muhamad Irfan Dedet Hermawan Setiabudi, Dedet Hermawan Djarot Wahju Santoso Dwi Hartini Dwi Lestari EKO YULIANTO Eli Kumolosari Ellyawan Setyo Arbintarso Eveline Rumoroy Bonifasius Saneba Charles Kapile Fadhil Azman, Hanif Fajrin, Fajrin Fakhrizal Fakhrizal, Fakhrizal Freddy Kurniawan GUNARSO GUNARSO Haliadi Hamdeni Medriosa Hasan Hasidu, La Ode Abdul Fajar Ilahi, Resa Fadhol Indra Warman Irfansyah, Rahmat Irman Hermadi ISKANDAR Isror, Maizul Jafril Tanjung, Jafril Kurniawan, Muh. Firdaus Agung Kunto Kusumawardani, Mawar Laia, Dominikus Yoeli Wilson Lukito, Aji Mahardhika, R. Hernan Maizetri, Resti Maizir Maizir Maulida, Siti Nurhaliza Mentemas, Abelia Minarni Minarni Minsaris, La Ode Alam Misbah Misbah MUCHLIS Muga, Yohanes Fernando Leo Mulyati Mulyati Mutawakkil Mutawakkil Mutawakkil Nongtji, Minarni Noor Latifah Nuraedah Nurcahyani Dewi Retnowati Nurfi Ahmadi, Nurfi Octavia, Dyla Midya Okto Dinaryanto Pinandhita, Lazuardy Rahendra Prattiwi, Elisabeth Anna Pudji Muljono Rachmat, Fauzy Rahardjo, Cakra Rahayu, Mina Ismu Ratna Reskiani, Dita Rinaldi, Donni Rore, Idrus Ruchaina, Annisa Nafilata Ruddy Kurniawan Santoso, Prasidananto Nur Sarif Hidayat, Sarif Shivani, Nifla Juniar Sri Widata Sudarmanto Sudarmanto, Sudarmanto Sulistyaningsih, Eka Suyuti Sylviana Maya Damayanti Tadoda, Mersy Marselyna Teguh Wibowo Triwibowo, Nur Ahmad Wibowo, Irfan Wicaksono, Angga Galih Luhur Wilujeung, Alya Dina Windayanti