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All Journal Jurnal Teknoin Jurnal Teknik ITS Jurnal Sains dan Seni ITS The International Journal of Accounting and Business Society ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Journal of Robotics and Control (JRC) Teknomekanik JMES The International Journal of Mechanical Engineering and Sciences Indonesian Journal of Innovation Studies Sewagati
I Made Londen Batan
Departemen Teknik Mesin Institut Teknologi Sepuluh Nopember
Aerospace Engineering Arts Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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Journal : Teknomekanik

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Natural fiber substitution in glass fiber-reinforced plastics: A Tensile properties simulation Wikarta, Alief; Andikusuma, Chandya; Ariatedja, Julendra; Batan, I Made Londen; Gapsari, Femiana; Khoo, Sze Wei
Teknomekanik Vol. 8 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i1.33472

Abstract

Glass fiber-reinforced polymer composite materials, commonly used for industrial axial flow fan blades due to their high strength-to-weight ratio, are environmentally criticized for their non-biodegradability. This concern has prompted the investigation of eco-friendly alternatives, such as sisal and kenaf as natural fibers. Although they generally have lower mechanical properties than synthetic fibers, they offer advantages in terms of biodegradability, cost, and density. This study aims to evaluate the feasibility of partially substituting glass fiber with unidirectional natural fibers kenaf and sisal in a 14-layer GFRP axial fan blade through numerical simulation. The research employed a finite element method (FEM) to simulate tensile testing in accordance with ASTM D-638 standards. Several hybrid layer configurations were analyzed, focusing on the number and position of natural fiber layers replacing glass fiber, particularly the glass roving (GR) layers. The simulation investigated how these substitutions influence the overall tensile stress and elastic modulus of the composite blade structure. The findings suggest that this substitution does not significantly affect tensile characteristics but substantially improves the biodegradability of the composite, resulting in a more environmentally friendly material without compromising mechanical performance.
Comparative analysis of bio-inspired and topology-optimized lattices under compressive loading Arifin, Ahmad Anas; Batan, I Made Londen; Bici, Michele; Wahjudi, Arif; Pramono, Agus Sigit
Teknomekanik Vol. 9 No. 1 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i1.45472

Abstract

Lattice structure design is still dominated by strut-based forms and surface-based shapes, such as triply periodic minimal surfaces (TPMS), which both exhibit overlapping limitations. Strut lattices often show strong anisotropy because their response depends heavily on cell orientation, while TPMS lattices are difficult to adjust when bounded by geometric constraints. These conditions eventually led to stagnation in the development of lattice morphology. Hybrid and topology-optimization methods have appeared as possible alternatives, but many of them still produce modified versions of classical patterns. This study examined two lattice geometries: the Pyramorph, inspired by the shape of a pyramid, and the Topomorph, generated through a topology optimization framework. Both structures were designed using a CAD unit cell patterning technique and manufactured using the FDM method, with relative densities ranging from 0.40 to 0.44. Their mechanical behaviour was examined through FEA simulation and uniaxial compression testing. The parameter variations included cell orientations of 0°, 15°, 30°, and 45°, and cell sizes of 8 mm and 12 mm within a 24 mm specimen. The Topomorph showed superior strength, reaching 15–20 MPa, while the Pyramorph reached only 7–8 MPa. The highest value, about 20.5 MPa, was obtained from the Topomorph at 0° and with an 8 mm cell size. Failure modes indicated buckling and delamination in the Pyramorph, while the Topomorph tended to collapse progressively. These findings indicate that topology optimization combined with CAD-based patterning could significantly improve lattice performance.
Co-Authors Agung Priyo Budiono Agus Sigit Pramono Alfie Adiananda Alief Wikarta Andikusuma, Chandya Andrew Andrew, Andrew Anneke Endang K Ardhi, Nusantara Fathonisyam Putra Ariatedja, Julendra Arif Wahjudi Arif Wahjudi Arifin, Ahmad Anas Arleta Listiyana Chandradewi Bambang Prayogi Bici, Michele Dewi, Dyah Santhi Dinny Harnany Dinny Harnany Dinny Harnany Eka Marliana Fahmi Mubarok Femiana Gapsari MF Izzudin, Maulana Yusuf Jun Surjanti Khoo, Sze Wei Lukman Yassir Amali Lukman Yassir Amali M. Khoirul Effendi Mohammad Khoirul Effendi Muhammad Ihsan Nurahmi, Latifah Nurahmi, Latifah Nurul Madinah Putu Dana Karningsih Sampurno Sampurno Sampurno Suhardjono Suhardjono Suhardjono Suhardjono Suryo, Is Bunyamin Susila Candra Thenny Daus Salamoni Wei, Guowu