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All Journal Automotive Experiences Journal of Public Transportation Community Sainstech Nusantara
Junipitoyo, Bambang
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Collapse Behavior and Energy Absorption Characteristics of Design Multi-Cell Thin Wall Structure 3D-Printed Under Quasi Statistic Loads Wirawan, Willy Artha; Junipitoyo, Bambang; Putro, Setyo Hariyadi Suranto; Sabitah, A’yan; Suudy, Ahmad Hamim; Ridwan, Ridwan; Choiron, Moch. Agus
Automotive Experiences Vol 7 No 1 (2024)
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.10892

Abstract

Crashworthiness is a passive device that has an important function as an absorbing component of the impact energy resulting from an accidental event. The main problem in the crashworthy design is the dimensional limitation on the front end of the vehicle with the driver so that most of the energy absorption is limited. Besides, the complexity of crashworthiness design is difficult to make conventionally. This research aims to find out the effectiveness of crashworthiness design in energy absorption and the resulting deformation patterns. Crashwortines are made in a multi-cell shape using PLA material and printed using a 3D printing raise machine. Crashworthiness is produced with four variation shapes of a Multi-cell circle (MCC), Multi-Cell square (MCS), Multicell pentagonal (MCP), and Multi-Cell pentagonal circles (MCPC) with a side thickness of 2 mm and a length of 150 mm. Experimental quasi-static testing is carried out in the frontal direction using a UTM machine at an operating speed of 2mm/s. The results of the study show that the design of the crash box of the pentagon circle has a significant increase in the energy absorption value of 62.49%, which can be recommended in future impact resistance tube designs. The characteristics of the deformation pattern and the failure resulting from the crashworthiness tend to form the pattern of the bending lamina failure. Failures can occur due to plastic fold, elastic bend, and pressure deformation mechanisms followed by new folding formations (lobes).
PENERAPAN HELICAL TURBIN SAVONIUS DI MUSHOLA BANUN NANDIR DESA BANJARANYAR TANJUNGANOM NGANJUK Sakti, Gunawan; Hariyadi, Setyo; Suyatmo, Suyatmo; Junipitoyo, Bambang
Journal of Public Transportation Community Vol. 4 No. 2 (2024): Journal Public Transportation Community Oktober 2024
Publisher : Politeknik Penerbangan Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46491/jptc.v4i2.2016

Abstract

Kegiatan pengabdian masyarakat bertujuan untuk memperkenalkan dan mengimplementasikan teknologi ramah lingkungan dalam bentuk turbin angin Savonius kepada masyarakat. Turbin angin Savonius merupakan salah satu solusi inovatif untuk memanfaatkan energi angin yang tersedia secara lokal. Kegiatan ini melibatkan serangkaian langkah, termasuk penyuluhan, pelatihan, dan penerapan teknologi turbin angin Savonius di lingkungan masyarakat. Penyuluhan dilakukan untuk menyebarkan pengetahuan tentang energi terbarukan dan manfaatnya bagi lingkungan. Selain itu, pelatihan teknis diberikan kepada anggota masyarakat untuk memahami konsep, perakitan, instalasi, dan perawatan turbin angin Savonius. Implementasi turbin dilakukan dalam skala kecil pada lingkungan yang relevan, seperti desa atau komunitas lokal. Metode pengukuran kinerja turbin angin Savonius dilakukan untuk mengevaluasi efisiensi dan kelayakan penggunaannya dalam lingkungan tersebut. Data yang terkumpul dari pengukuran tersebut menjadi dasar untuk mengevaluasi dampak lingkungan, efisiensi energi, dan manfaat ekonomi dari penerapan teknologi ini. Hasil kegiatan pengabdian masyarakat dapat meningkatkan kesadaran akan pentingnya energi terbarukan dan memberikan wawasan praktis kepada masyarakat tentang pemanfaatan sumber energi alternatif. Selain itu, masyarakat dapat melihat manfaat turbin angin Savonius dalam mengurangi emisi karbon, menghemat energi, serta potensi penghematan biaya dalam jangka panjang. Dengan demikian, kegiatan pengabdian masyarakat ini dapat menjadi landasan untuk penyebarluasan teknologi ramah lingkungan yang lebih luas di masyarakat.
Enhancing the Properties of Aluminum AA-1100: The Effect of Mg and Copper Additives with Heat Treatment BIMA, Bima Wahyu Saputra; Junipitoyo, Bambang
SAINSTECH NUSANTARA Vol. 2 No. 1 (2025): February 2025
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v2i1.62

Abstract

Aluminum alloys, renowned for their low density, high strength, and corrosion resistance, are widely utilized in industries such as aerospace. However, Aluminum 1100 is typically too soft, which necessitates the addition of alloying elements like magnesium (Mg) and copper (Cu) to improve its mechanical properties. This study examines the effects of adding 1.2% magnesium and varying copper concentrations (3.9%, 4.1%, and 4.3%) to Aluminum 1100, followed by heat treatment at 100°C, 200°C, 300°C, and 400°C for 120 minutes. The physical properties, including density, as well as mechanical properties—tensile strength and Vickers hardness—were evaluated. The results revealed that the highest density (3.408 g/cm³) occurred at 300°C with 1.2% Mg and 4.1% Cu. The maximum tensile strength (130.7948 MPa) was observed in the alloy with 4.3% Cu at 400°C, while the highest strain (0.03995%) was recorded at 300°C with 4.3% Cu. The lowest modulus of elasticity (2635.292 MPa) was measured at 100°C with 4.3% Cu, and the highest value (4162.763 MPa) was obtained at 200°C with 4.1% Cu. Additionally, the highest Vickers hardness (90.27 HVN) was achieved in the alloy containing 1.2% Mg and 4.3% Cu at 400°C.
Effect of Heat Treatment and 1,5% Magnesium Addition on Density, Hardness, and Tensile Strength of Al-Cu-Mg Alloys Junipitoyo, Bambang; Said, Djamaaludin; Dwiyanto, Dwiyanto
SAINSTECH NUSANTARA Vol. 1 No. 3 (2024): August 2024
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v1i3.61

Abstract

This research focuses on adding aluminum 1100 combinations by adding magnesium (Mg) as much as 1.5% and varying the percentage of copper (Cu). 3.9%, 4.1%, 4.3%/ with heat treatment at temperatures of 1000C, 2000C, 3000C, and 4000C  with a holding time at each temperature of 120 minutes, then tested the aluminum combination's density, Vickers hardness, and tensile strength. The final results of this study showed that in the density test, the highest density value obtained was 4.24 gr/cm3 in a mixture of 1.5% magnesium and 4.3% copper (Cu) with a temperature of 2000C. In the Vickers hardness test, the highest hardness value was 83.9 HVN in a mixture of 1.5% magnesium and 4.3% copper with a temperature of 4000C. The final result of the research conducted was to obtain the tensile strength results of each specimen by obtaining the maximum tensile strength of the 4.1% Cu mixture specimen with a temperature of 4000C of 163.2698 Mpa and the highest strain value in the 4.3% Cu mixture specimen with a temperature of 4000C of 0.0472 %, for the results of the lowest elastic modulus value in the 4.3% Cu mixture specimen with a temperature of 2000C of 3147.319 Mpa and the highest value of the 4.1 % Cu mixture specimen with a temperature of 4000C of 5947.898 Mpa.
Co-Authors BIMA, Bima Wahyu Saputra Dwiyanto . Moch. Agus Choiron Ridwan, Ridwan Sabitah, A'yan Said, Djamaaludin Sakti, Gunawan Setyo Hariyadi Suudy, Ahmad Hamim Suyatmo, Suyatmo Wirawan, Willy Artha