Analisis Kekuatan Komposit Serat Karbon Metode Hand Lay-Up Dengan Variasi Radius 50 Mm, 100 Mm Dan 150 Mm Terhadap

Taufiqurahman, Achmad (2026) Analisis Kekuatan Komposit Serat Karbon Metode Hand Lay-Up Dengan Variasi Radius 50 Mm, 100 Mm Dan 150 Mm Terhadap. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Komposit serat karbon merupakan material yang banyak digunakan pada berbagai bidang industri karena memiliki rasio kekuatan terhadap berat yang tinggi, namun bentuk komponen yang melengkung dapat menimbulkan konsentrasi tegangan sehingga memengaruhi ketahanan terhadap beban impak. Penelitian ini bertujuan untuk menganalisis pengaruh variasi radius lengkungan 50 mm, 100 mm, dan 150 mm terhadap kekuatan impak komposit serat karbon, mengidentifikasi karakteristik pola patahan setelah pengujian, serta menentukan radius yang paling efektif dalam meningkatkan ketahanan impak. Spesimen dibuat menggunakan metode hand lay-up dengan penguat serat karbon unidirectional lima lapis dan matriks resin epoksi menggunakan cetakan hasil 3D printing berbahan PLA, kemudian diuji menggunakan metode Charpy sesuai standar ISO 179-1. Hasil pengujian menunjukkan bahwa peningkatan radius lengkungan berpengaruh terhadap meningkatnya kemampuan komposit dalam menyerap energi impak, dengan nilai kekuatan impak rata-rata tertinggi pada spesimen melengkung diperoleh pada radius 150 mm sebesar 0,2045 kgf/mm², sedangkan radius 50 mm menghasilkan nilai terendah akibat konsentrasi tegangan yang lebih tinggi pada daerah lengkung. Pengamatan pola patahan menunjukkan adanya mekanisme matrix cracking, delamination, dan fiber breakage sebagai bentuk kegagalan dominan setelah menerima beban impak. Berdasarkan hasil penelitian dapat disimpulkan bahwa semakin besar radius lengkungan, distribusi tegangan pada komposit semakin merata sehingga meningkatkan kekuatan impak, dengan radius 150 mm menjadi variasi yang paling optimal di antara spesimen yang memiliki lengkungan.
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Carbon fiber composites are widely used in the automotive, aerospace, and manufacturing industries due to their high specific strength, light weight, and corrosion resistance. In these applications, composite components are often fabricated in curved shapes, suggesting that the radius geometry influences the material’s ability to withstand impact loads. This study aims to analyze the effect of varying curvature radii on the impact strength of carbon fiber composites fabricated using the hand lay-up method. Specimen molds were created using PLA-based 3D printing technology with radius variations of 0 mm, 50 mm, 100 mm, and 150 mm. The composite material consisted of five layers of unidirectional carbon fiber with an epoxy resin matrix. Impact testing was conducted using the Charpy method in accordance with ISO 179-1, followed by visual observation of the fracture pattern characteristics. The results indicate that variations in radius affect the composite’s impact energy absorption capacity. Specimens with a 0 mm radius exhibited the highest impact strength because stress distribution was more uniform, without stress concentration caused by the curved geometry. For specimens with curvature, the impact strength increased as the radius increased, with a radius of 150 mm yielding the highest value compared to radii of 50 mm and 100 mm. Observation of the fracture patterns revealed a failure mechanism dominated by matrix cracking, delamination, and fiber breakage. Based on these results, it can be concluded that as the curvature radius increases, the stress distribution becomes more uniform, thereby improving the composite’s impact resistance; a radius of 150 mm is the most optimal curvature radius in this study.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Komposit, Serat Karbon, Resin Epoxy, Hand Lay-Up, Uji Impak, ISO 179-1,Composite, Carbon Fiber, Epoxy Resin, Hand Lay-Up, Impact Test, ISO 179-1
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials. Laminated materials.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Achmad Taufiqurahman
Date Deposited:	29 Jul 2026 03:15
Last Modified:	29 Jul 2026 03:15
URI:	http://repository.its.ac.id/id/eprint/138985

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