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All Journal Majalah Ilmiah Pengkajian Industri Jurnal Teknologi Dirgantara Jurnal Teknologi Terapan Automotive Experiences Prosiding SNTTM Indonesian Journal of Aerospace
Jos Istiyanto
Department Of Mechanical Engineering, University Of Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Optimasi pengurangan massa superstruktur dan hatch cover kapal ikan 5 GT Gerry Liston Putra; Hendri Budiono; Jos Istiyanto
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/mkenzf29

Abstract

Indonesia sebagai salah satu negara kepulauan terbesar memiliki potensi besar di sektor maritim. Pemerintah Indonesia menempatkan industri perkapalan sebagai salah satu sektor prioritas untuk dikembangkan. Industri galangan kapal menghasilkan berbagai produk, termasuk kapal dan bangunan lepas pantai, dengan kapal ikan sebagai salah satu produk utamanya. Kapal ikan berfungsi untuk menangkap sekaligus membawa hasil tangkapan. Sebagian besar kapal ikan tradisional masih terbuat dari kayu yang membutuhkan perawatan tinggi dan biaya besar. Modernisasi kapal ikan dengan penggunaan material seperti baja, aluminium 5083, dan HDPE menjadi penting untuk meningkatkan daya saing nelayan.Penelitian ini mengoptimalkan bagian superstruktur dan fish hold hatch cover pada kapal ikan 5 GT menggunakan metode Finite Element Method (FEM) dan persamaan bending stress untuk mengurangi massa kapal. Hasil optimasi menunjukkan bahwa tegangan yang terjadi pada struktur tetap memenuhi standar badan klasifikasi. Optimasi menghasilkan penurunan berat yang signifikan: untuk material mild steel, penurunan berat superstruktur sebesar 45% dan hatch cover sebesar 46%. Untuk aluminium 5083, penurunan berat superstruktur sebesar 17,34% dan hatch cover sebesar 18,95%. Sebaliknya, pada material HDPE terjadi peningkatan berat struktur sebesar 78,08 kg atau sekitar 161,857% dari berat desain. Temuan ini menegaskan pentingnya pemilihan material dan ketebalan pelat yang tepat guna mencapai efisiensi optimal dalam konstruksi kapal ikan.
Crashworthiness of Thin-Walled Structures: Influence of Materials, Geometry, Manufacturing Processes and Loading Conditions Ardiansyah, Riki; Istiyanto, Jos; Adhitya, Mohammad; Muttaqie, Teguh
Automotive Experiences Vol. 9 No. 2 (2026)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.16034

Abstract

Crashworthiness is a critical requirement for lightweight structures in automotive, electric vehicle and aerospace applications, where efficient energy absorption and controlled force transmission are essential. This review looks at more than 100 experimental, numerical, and analytical studies published between 2013 and 2025. It focuses on how materials, geometry, manufacturing processes, and loading conditions work together to affect the crashworthiness of thin-walled structures. Using a PRISMA inspired systematic narrative review combined with bibliometric and thematic analyses, key performance metrics: peak crushing force (PCF), mean crushing force (MCF), energy absorption (EA), specific energy absorption (SEA) and crushing force efficiency (CFE) are evaluated across metals, polymers, composites and hybrid systems, as well as non-tapered, tapered geometries under quasi-static and dynamic loading. The reviewed studies show that crashworthiness is best improved through a good combination of material, geometry, manufacturing quality and loading conditions. Hybrid structures are particularly promising, but their performance depends heavily on the interface quality, shape, and testing conditions.
Effect of Manufacturing Route and Fiber Orientation on the Mechanical Performance of Carbon Fiber Composites for Automotive Lightweight Components Abdurohman, Kosim; Adhitya, Mohammad; Istiyanto, Jos; Kurniawan, Farohaji; Habibullah, Mohammad; Agustian, Rialdi; Pratama, Mikhael Gilang Pribadi Putra; Utama, Agus Bayu; Aritonang, Rian Suari
Automotive Experiences Vol. 9 No. 2 (2026)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.16310

Abstract

This study evaluates the effects of manufacturing method and fiber orientation on the mechanical performance of carbon fiber-reinforced polymer (CFRP) composites for automotive applications. Unidirectional CFRP laminates were fabricated using vacuum bagging (VB), vacuum-assisted resin infusion (VARI), and hand lay-up (HLU). Specimens with 0° and 90° fiber orientations were tested under tensile and compressive loading, while ±45° specimens were evaluated for in-plane shear response through tensile testing. Short-beam and V-notched beam tests were conducted to determine interlaminar shear and shear properties. Microstructural characterization of the manufactured laminates and fractured specimens was performed using CT-scan and SEM, supported by finite element validation. Unlike previous studies focusing on limited properties or a single manufacturing route, this work provides a comprehensive comparison of HLU, VB, and VARI CFRP laminates by integrating mechanical testing, defect analysis, fracture observations, and numerical assessment. The results show that VARI produced superior laminate compactness and the highest tensile-related properties, although this improvement did not correspond to higher interlaminar shear strength, highlighting the influence of manufacturing-induced laminate architecture. For 0° specimens, ultimate tensile strengths were 507.72 ± 52.14 MPa for HLU, 685.69 ± 62.65 MPa for VB, and 774.31 ± 58.18 MPa for VARI. At ±45°, tensile strengths were 20.85 ± 0.82, 21.20 ± 0.45, and 22.18 ± 0.81 MPa, respectively. At 90°, manufacturing method had no significant effect on tensile strength, although tensile modulus remained method-dependent. The highest 0° compressive strength was obtained by HLU at 124.8 ± 13.1 MPa, whereas VARI showed the highest 90° compressive strength at 44.60 ± 0.82 MPa. VARI exhibited lower shear and interlaminar shear strengths of 15.31 ± 1.01 and 13.68 ± 0.85 MPa, respectively, indicating that increased fiber volume fraction did not substantially improve these properties. Nevertheless, VARI achieved the highest tensile and shear moduli, reaching 39.31 ± 4.58 GPa and 1.50 ± 0.15 GPa. Microstructural observations confirmed that improved resin distribution, reduced defects, and stronger fiber–matrix bonding in VARI contributed to enhanced overall mechanical performance. These findings demonstrate that manufacturing route governs different failure mechanisms and should therefore be selected according to the dominant loading mode and required laminate properties.
Co-Authors A.A. Ketut Agung Cahyawan W Abdurohman, Kosim Agustian, Rialdi Aritonang, Rian Suari Aryandi Marta bobi khoerun Danardono Agus Sumarsono Dony Hidayat Endramawan, Tito Felix Dionisius Gerry Liston Putra Habibullah, Mohammad Harry Purnama Hendri Budiono Hendri DS Budiono Heni Pujiastuti Hidayat, Dony Hidayat, Kurnia Jekki Hendrawan Joko Triwardono KURNIAWAN, FAROHAJI Malawat, Mohammad Marta, Aryandi Mohammad Adhitya, Mohammad Muttaqie, Teguh Nur Rohmat, Yusup Pratama, Mikhael Gilang Pribadi Putra Purnama, Harry Putra, Gerry Liston Riki Ardiansyah, Riki Sugeng Supriadi, Sugeng Suliono Suliono Suwandi, Dedi Tito Sitanggang, Tito Utama, Agus Bayu Wahyu Purnawirawan Wasiah, I'ah Yudan Whulanza