Ramadhan, Fahri Ilham (2026) Pengaruh Variasi Fraksi Volume pada Komposit dengan Penguat Serat Kelapa dan Serat Tebu terhadap Uji Impak dan Struktur Makro dengan Metode Hand Lay Up. (The Effect of Volume Fraction Variations in Composites Reinforced with Coconut Fiber and Sugarcane Fiber on Impact Testing and Macrostructure Using the Hand Lay-Up Method). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.
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Abstract
This study aims to analyze the effect of hybrid fiber volume fraction variations on the mechanical properties of composite materials intended as an alternative material for helmet shells. The materials used consist of coconut fiber (coir fiber) and sugarcane fiber (bagasse fiber) as reinforcement materials and epoxy resin as the matrix. The utilization of these natural fibers is expected to increase the added value of abundant agricultural waste in Indonesia while producing lightweight, strong, and environmentally friendly composite materials. The composite specimens were fabricated using the Hand Lay-Up method and treated with a 5% NaOH alkaline solution to improve the interfacial bonding between the fibers and the matrix. The composition variations used were sugarcane fiber to coconut fiber ratios of 30%:10%, 20%:20%, and 10%:30%, with a total fiber volume fraction of 40%. The tests conducted included the Charpy impact test and macrostructure observations. The results showed that the highest impact strength value was obtained by specimen K3L3 (10% sugarcane fiber and 30% coconut fiber in the third layer) at 547,083 kJ/m², while the lowest value was obtained by specimen K1L1 at 126.250 kJ/m². An increase in coconut fiber content and the number of composite layers significantly improved the material's ability to absorb impact energy. Macrostructure observations also indicated that a more homogeneous fiber distribution and lower porosity resulted in better interfacial bonding, thereby enhancing the toughness of the composite. Based on the results, it can be concluded that variations in fiber volume fraction and the number of layers significantly affect the impact properties of hybrid coconut fiber sugarcane fiber composites. The composition containing 10% sugarcane fiber and 30% coconut fiber demonstrated the best potential to be developed as an alternative helmet shell material that is lightweight, environmentally friendly, and possesses good impact resistance.
| Item Type: | Thesis (Undergraduate) |
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| Uncontrolled Keywords: | composite, coconut fiber, sugarcane fiber, epoxy resin, volume fraction, impact test, macrostructure, Hand Lay-Up method. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Program Studi Teknik Mesin |
| Depositing User: | 1422100068 Fahri Ilham Ramadhan |
| Date Deposited: | 24 Aug 2026 03:30 |
| Last Modified: | 24 Aug 2026 03:30 |
| URI: | http://repository.untag-sby.ac.id/id/eprint/47932 |
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