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All Journal PROSIDING SEMINAR NASIONAL Rotasi Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Proceeding Of The International Seminar and Conference 2015 Majalah Ilmiah MOMENTUM JMPM (Jurnal Material dan Proses Manufaktur) Jurnal Taman Vokasi Jurnal Teknik Mesin Indonesia Abdimas UNWAHAS : Jurnal Pengabdian Masyarakat UNWAHAS Jurnal Ilmiah Cendekia Eksakta Jurnal Inovasi Teknik Kimia Jurnal Litbang Provinsi Jawa Tengah Abdi Masya Jurnal Rekayasa Energi dan Mekanika Mechanical Engineering for Society and Industry Automotive Experiences Creative Research in Engineering (CERIE) Mediagro Journal of Chemical Process and Material Technology Suara Teknik : Jurnal Ilmiah Jurnal Polimesin Palawa Jurnal Pengabdian Kepada Masyarakat
Helmy Purwanto
Universitas Wahid Hasyim
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Transportation Other

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Strength Analysis of Welded Joints on the Frame Electric Bicycle Kholis, Nur; Purwanto, Helmy; Mahendra, Isa
Suara Teknik : Jurnal Ilmiah Vol 16 No 1 (2025): Suara Teknik: Jurnal Ilmiah - Mei
Publisher : Fakultas Teknik dan Ilmu Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29406/stek.v16i1.7357

Abstract

This study aims to determine and analyze the electric bicycle frame on macro and micro structures, tensile testing, and hardness testing. This research uses hollow low carbon steel material with a length of 100 mm, width of 6 mm, and thickness of 2 mm. The method used is observation of macro and micro structures, vickers mickrohardness hardness testing. Furthermore, the specimens were welded with current variations of 100 A, 110 A, and 120 A with ASTM E8 design. From the observation of the macro structure, the best results are in the 110 A current variation compared to the 100 and 120 Ampere variations, because the 100 and 120 Ampere results experienced weld failure. The results of the microstructure test at a current of 100 A show that the pearlite phase dominates the parent metal and HAZ areas, while the welding area is dominated by Ferite. In testing the microstructure of 110 A current, it appears that pearlite dominates the parent metal and HAZ areas, while the welding area is dominated by martensite. In testing the microstructure of 120 A current can be seen in the parent metal and HAZ dominated by pearlite, while the welding area is dominated by martensite. From the Vicker microhardness test, the highest results in the welding area in the 120 A current variation and the lowest point in the parent metal in the 100 A current variation. The tensile test results show the highest value of yield stress 352.581 MPa and max stress 390.822 MPa shown in the 110 A current variation.
Optimasi parameter proses pembuatan komposit aluminium daur ulang yang diperkuat serbuk alumina dengan metode stir casting Kholis, Nur; Helmy Purwanto; Ahmad Adib
Jurnal Taman Vokasi Vol 11 No 2 (2023): Vol. 11 No. 2 (2023)
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/jtvok.v11i2.15904

Abstract

Stir casting merupakan salah satu metode pembuatan bahan logam yang populer dalam industri manufaktur. Penelitian ini bertujuan mengoptimalkan parameter kecepatan mixing aluminium daur ulang yang diperkuat dengan serbuk alumina terhadap struktur mikro, kekerasan dan tarik. Material yang digunakan pada penelitian ini adalah menggunakan bahan limbah aluminium yaitu limbah velg bekas. Parameter yang digunakan pada proses stir casting ini adalah variasi kecepatan 500, 600 dan 700 rpm. Pada pengamatan struktur mikro menggunakan metallografy optik dan Rockwell hardness digunakan untuk menguji kekerasan serta untuk pengujian tarik menggunakan Universal Testing Machine. Hasil pengamatan struktur mikro menunjukkan hasil terbaik terjadi pada parameter kecepatan 500 rpm, karena sedikitnya porositas. Pengujian kekerasan terbaik 87.65 HRB terjadi pada perameter kecepatan 500 rpm, hasil tersebut sejalan pada pengamatan strukturmikro. Pada hasil pengujian tarik nilai tertinggi 65.46 Mpa, hasil tersebut berbanding terbalik dari pengujian yang lain. Faktor yang mempengaruhi hasil tersebut adalah proses pengadukan yang kurang stabil.
GAYA ANGKAT DAN GAYA HAMBAT SAYAP PUNA MODEL NACA 0015 MENGGUNAKAN SIMULASI ANSYS FLUENT Dzulfikar, Muhammad; Purwanto, Helmy; Abdul Wahid, Muhammad; Rahmatulloh, Salim
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1707

Abstract

The hi-speed computational using simulation software has emerged for the calculation of force dynamic. Albeit the significant progress in the computational method, the aerodynamic of flying wing are somewhat elusive. Herein, we performed a detailed computation of the lift and drag behaviors of NACA-0015 flying wing modelled through the surveillance speeds and difference angle of attack using Ansys. This study aims to determine and analyze the maximum angle of attack, lift force and drag force at speeds of 10 m/s, 30 m/s, and 50 m/s. The method used is analysis using CFD (Computational Fluid Dynamic) simulation software. The simulation uses Ansys Fluent to determine the aerodynamic characteristics, after varying the angle of attack at a predetermined speed on an airplane (unmanned aerial vehicle) wing with a NACA 0015 airfoil. The results of the research that has been carried out are the maximum angle of attack at a predetermined speed variation (Re = 0.2 x 105 to 1.0 x 105), namely 25° at each angle of attack, with details of a speed of 50 m/s getting the highest lifting force, around 38,72 N and drag force in the area 6,49 N.
Physical and mechanical properties of aluminum matrix composites reinforced with copper powder via stir casting method Kholis, Nur; Purnama, Yudhi; Nugroho, Agung; Purwanto, Helmy; Hawari, Rizal
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5587

Abstract

The stir casting method is a widely used technique for producing metal matrix composites by incorporating reinforcement particles into molten metal. This study investigates the effect of copper (Cu) powder reinforcement on the microstructure and mechanical properties of aluminum matrix composites fabricated using the stir casting method. The base material consists of recycled aluminum from vehicle wheels, with copper added as a reinforcement to enhance the mechanical characteristics of the cast material. The casting process involved melting aluminum waste at 650°C, followed by the gradual addition of Cu powder in varying volume fractions (2.5%, 5%, and 7.5%) while stirring at a constant speed of 500 rpm for 5 minutes to ensure uniform distribution. The microstructural analysis was conducted using optical metallography, while tensile and hardness properties were evaluated using a Universal Testing Machine. The results indicate that the most uniform powder distribution was achieved at 5% Cu reinforcement, whereas the highest porosity was observed at 7.5% due to particle agglomeration. The highest hardness value (42.52 BHN) was observed at 2.5% Cu reinforcement, while the maximum tensile strength (111.7 MPa) was obtained at 5% Cu. However, an increase in Cu content beyond 5% led to a decline in mechanical properties due to increased porosity and reduced bonding efficiency. These findings highlight the importance of optimizing Cu content in aluminum matrix composites to balance mechanical strength and structural integrity.
Transformasi Limbah Menjadi Manfaat: Edukasi Pembuatan Lilin Wangi dari Minyak Jelantah Rita Dwi Ratnani; Helmy Purwanto; Aufa Fahmazida; Meta Liftyastuti; Muhammad Rafi Najib; Diah Ayu Lestari; Irvan Sovian; Luthfiyah Harum Pratiwi; Muhamad Hafid Falihurrozan; Nesia Ursulla Endarhadi; Assyifa Khairunnisa; Bayu Fredo Wicaksono; Erika Febiana Lasifa
Palawa: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 1 (2025)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/palawa.v4i1.14030

Abstract

Minyak jelantah merupakan limbah rumah tangga yang berpotensi mencemari lingkungan dan membahayakan kesehatan apabila digunakan secara berulang atau dibuang sembarangan. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk memberikan edukasi melalui pelatihan kepada warga, khususnya menambah wawasan bagi ibu-ibu PKK di Kelurahan Jatirejo, Kecamatan Gunungpati, Kota Semarang. Pelatihan mengenai pemanfaatan minyak jelantah menjadi produk bernilai guna, yaitu lilin wangi. Metode pelaksanaan mencakup presentasi dalam seminar mengenai dampak negatif minyak jelantah terhadap lingkungan dan kesehatan, serta praktik langsung pembuatan lilin wangi. Kegiatan ini diikuti oleh 30 anggota PKK dan berlangsung secara interaktif. Hasil kegiatan menunjukkan antusiasme tinggi dari peserta dan respons positif terhadap inovasi pemanfaatan limbah rumah tangga menjadi produk yang bernilai ekonomis dan ramah lingkungan. Diharapkan, kegiatan ini dapat meningkatkan kesadaran dan keterampilan masyarakat dalam mengelola limbah secara kreatif. Kata kunci: minyak jelantah, lilin wangi, edukasi lingkungan, ibu PKK Kelurahan Jatirejo, pengabdian masyarakat
Co-Authors . Suyitno Abdul Latif Abdul Wahid, Muhammad Agus Suprapto Agus Suprapto Ahmad Adib AHMAD ADIB Aji Topan Asmoro Ananto, Reza Ardian Andika Dwi Putra Anindito Purnowidodo Anindito Purnowidodo Anjis Ahmad Soleh Anwar, Mohammad Zainul Artisa Endar Kurniawan Assyifa Khairunnisa Aufa Fahmazida Bajar Sulistiyo Bayu Fredo Wicaksono Darmanto Darmanto Darmanto Darmanto Darul Iman Dergo Nurhadi Diah Ayu Lestari Dwi Setyo Agus Dwi Setyo Agus Prakoso Eka nur Khalish, Yahdi Erika Febiana Lasifa Habibul Mujtabah Hadi Nasbey Harsono Harsono Hawari, Rizal Ihsan Fauzi Ilham Fakhrudin Imam Syafaat Indah Hartati Irvan Sovian Irwan Hardiansyah Kosasi Irwanto Irwanto Jaenal Arifin Jamhari Jamhari Kuat Hasan Lutfi Aris Sasongko Luthfiyah Harum Pratiwi M. N. Habibiy M. Yusrul Niam A Mahendra, Isa Meta Liftyastuti Miftah Azizi Miftakhul Huda Miharja Awan Jaya Mochamat Sobirin Moh Hendri Priyono Mohamad Lasno Mufidin, Wahid Muh. Aris Yahya, Muh. Aris Muhamad Hafid Falihurrozan Muhammad Dzulfikar Muhammad Ilhammudin Muhammad Rafi Najib Muhammad Syaiful Nurkholiq Mujiyono Mujiyono Mulyonorejo - Musa Assegaff Mustagfirin Nesia Ursulla Endarhadi Ngatmin Ngatmin Nugroho, Agung Nur Kholis Nur Kholis Nur Kholis Nyoto Lestari Pangestu, Wahyu Adi Parwening Sabdo Hermawan Prawibowo, Hartanto Prio Tri Iswanto Pungkas Prayitno Rahmatulloh, Salim Renan Subantoro Reza Ardian Ananto Rifky Ismail Rita Dwi Ratnani Rudy Soenoko Rudy Soenoko Rusman Rusman Saiful Amin SM Bondan Respati SM Bondan Respati Sri M. Bondan Respati Sri M. Bondan Respati Sri Mulyo Bondan Respati Sugeng Prasojo Sugeng Priyono Sugiarto Sugiarto Sumidi Sumidi Suntari Suntari Suwardiyono Suwardiyono Ulin Nuha Wahid, Muhammad Abdul Wahyu Kheren Sabyantoro Wicaksono, Burhanuddin Yudhi Purnama Zainal Abidin