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All Journal Science and Technology Indonesia Journal of Science and Applicative Technology Indonesian Mining Journal Jurnal Ilmu Fisika Jurnal Teori dan Aplikasi Fisika JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Logic : Jurnal Rancang Bangun Dan Teknologi Indonesian Mining Journal
Sipahutar, Wahyu Solafide
Program Studi Teknik Material, Institut Teknologi Sumatera, Lampung Selatan 35365, Indonesia
Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Effect of Fiberglass Layer Number on the Mechanical Properties of Composites Fabricated Using the Vacuum-Assisted Resin Infusion (VARI) Method Hanifah, Istiara Rizqillah; Putra, Oji Kuncoro Darma; Sipahutar, Wahyu Solafide; Phasa, Agita
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.195

Abstract

Composite materials are engineered by combining two or more constituents to obtain improved mechanical performance. In this study, the effect of fiberglass layer number (2 and 3 layers) on the mechanical properties of composites was investigated. The specimens were fabricated using the Vacuum-Assisted Resin Infusion (VARI) method, and mechanical tests were conducted based on ASTM D3039 (tensile) and ASTM D790 (flexural) standards. The 3-layer specimen (A2) exhibited the highest tensile strength of 223.33 MPa and flexural strength of 845.54 MPa, compared to 179.73 MPa and 828.35 MPa in the 2-layer specimen (A1), respectively. In addition, the 3-layer composite showed greater stiffness with an elastic modulus of 612.76 GPa in bending and 1.41 GPa in tension. These results confirm that increasing the number of fiberglass layers enhances the composite's mechanical strength, due to better load distribution and improved interfacial bonding.
Effect of Fiber Orientation on the Mechanical Performance of Polyester/Fiberglass Composites Fabricated by VARI Agita Phasa; Oji Kuncoro Darma Putra; Wahyu Solafide Sipahutar; Istiara Rizqillah Hanifah
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.196

Abstract

The fiber orientation in polyester/fiberglass composites fabricated using the Vacuum Assisted Resin Infusion (VARI) method was investigated. Three different fiber orientation configurations consisting of three woven layers were used: 0°/45°/0°, 45°/45°/45°, and 45°/0°/45°. Tensile and flexural tests were conducted to evaluate the strength, strain, and flexural modulus of each specimen. The results demonstrated that fiber orientation has a significant impact on mechanical performance. The 0°/45°/0° specimen exhibited the highest tensile strength of 164.66 MPa and flexural strength of 1091.17 MPa. In contrast, the 45°/45°/45° specimen showed the lowest tensile strength of 58.57 MPa, while the 45°/0°/45° specimen had the lowest flexural strength of 772.97 MPa. The 45°/45°/45° configuration displayed intermediate mechanical values with a more homogeneous stress distribution. Interestingly, the highest flexural modulus, 5702.23 MPa, was obtained from the 45°/0°/45° specimen, indicating high stiffness despite limited deformation. These findings confirm that proper selection of fiber orientation plays a crucial role in designing composites with an optimal balance of strength, stiffness, and ductility.
The Effect of Volume Fraction Variation on The Mechanical Properties of Epoxy-based Sugarcane Fiber Composites Anisa Fitri; Prasetya, Bayu; Siregar, Muhammad Yasin; Prakoso, Ahmad Andryan; Sipahutar, Wahyu Solafide
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 2 (2025): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i2.85-92

Abstract

The use of natural fibers as reinforcement in composite materials offers an environmentally friendly alternative to synthetic fibers. Among them, sugarcane fiber (bagasse), an agro-industrial byproduct rich in cellulose, hemicellulose, and lignin, holds considerable potential but remains underutilized. This study aims to evaluate the effect of varying sugarcane fiber volume fractions (50%, 60%, and 70%) on the mechanical properties of epoxy resin-based composites. The composites were fabricated using the hand lay-up method, followed by mechanical testing including tensile tests (ASTM D3039) and bending tests (ASTM D790). The results showed that the highest tensile strength of 26.43 MPa was achieved by the E70 sample, while the E50 sample exhibited the highest bending strength at 142.53 MPa. Fractographic analysis revealed that structural defects such as voids, fiber pull-out, and debonding significantly influenced the mechanical performance of the composites. While fiber volume fraction has a notable impact on tensile and bending strengths, the relationship is not strictly linear due to variations in fiber-resin distribution and interfacial bonding quality. These findings suggest that sugarcane fiber-based epoxy composites, particularly with a 50% volume fraction, have strong potential for application in lightweight structural components, furniture panels, or automotive interior parts. Future research may focus on improving interfacial bonding through chemical treatments or hybridization with other natural fibers to further enhance performance.
Binder Influence on Barium Hexaferrite: Comparative Analysis of PVA and Silicone Rubber in Sintered Magnets Sipahutar, Wahyu Solafide; Putrie, Gustya Salma; Putri, Faiza Armalia; Farhan, Abi; Hafid, Muhamad
Jurnal Ilmu Fisika Vol 17 No 2 (2025): September 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.2.135-145.2025

Abstract

This study explores the impact of binder types—polyvinyl alcohol (PVA) and silicone rubber (SR)—on the physical, magnetic, and mechanical properties of barium hexaferrite (BaFe12O19), synthesized via mechanical alloying and sintered at 1100°C. SEM-EDX confirmed the formation of BaFe12O19 with an average particle size of around 0.7 µm. VSM results showed a saturation magnetization (Ms) of 71.17 emu/g, remanent magnetization (Mr) of 47.8 emu/g, and coercivity (Hc) of 0.33 T. The addition of PVA reduced density (3.13–3.07 g/cm³), increased porosity (17.72%–18.47%), and decreased magnetization (0.93–0.80 mT). In contrast, SR enhanced densification, leading to higher density (3.65–3.57 g/cm³), lower porosity (6.95%–7.51%), and significantly higher hardness (232.9–438.92 HV). SR also improved mechanical strength, while PVA proved more effective in reducing shrinkage and improving magnetization. These results underscore the significant role of binder type and concentration in optimizing the properties of sintered barium hexaferrite, with SR excelling in mechanical strength and PVA in magnetization.
Co-Authors Abdul Muhyi Andryan Prakoso, Ahmad Anisa Fitri Anisa Fitri Anisa Fitri Anrokhi, Mohamad Samsul Astri Aulia Suwanda Azwar Manaf Bahfie, Fathan Bayu Prasetya Diah Susanti Eka Nurfani Erik Prasetyo Fahmi, Achmad Gus Fajar Aditya Julyatmojo Fajar Nurjaman Farhan, Abi Fathar Fathan Mubin Fathar Fathan Mubina Hadi Teguh Yudistira, Hadi Teguh Hafid, Muhamad Haloho, Trivendi Hanifah, Istiara Rizqillah Kardo Rajagukguk, Kardo Mochamad Ghulam Isaq Khan Muhamad Fatikul Arif Muhammad Saeful Fadlan Muhammad Yasin Siregar Muljadi Muljadi Oji Kuncoro Darma Putra Okky Fajar Tri Maryana Pasaribu, Joshua Leonardo Phasa, Agita Prakoso, Ahmad Andryan Prasetya, Bayu Putra, Oji Kuncoro Darma Putri, Faiza Armalia Putrie, Gustya Salma Quratul Aini Rianjanu, Aditya Rio Ardiansyah Murda Risa Nurin Baiti Riyan Ferdiyanto Sena Maulana Tarmizi Taher Widi Astuti William Wiliiam