Tensile and morphological properties of carbon-coir fiber reinforced epoxy hybrid composites

Salahuddin Junus (University of Jember)
Yayang Saif Izzudin (University of Jember)
Aris Zainul Muttaqin (University of Jember)
Danang Yudistiro (University of Jember)
Mochamad Asrofi (University of Jember)
Sumardi Sumardi (University of Jember)
Puranggo Ganjar Widityo (University of Jember)
Revvan Rifada Pradiza (University of Jember)

Jurnal Polimesin
Vol 23, No 1 (2025): February

This study reports the tensile and morphological properties of carbon fiber-reinforced epoxy composites  with the addition of coconut coir fiber. The composites were fabricated using the vacuum infusion method with coconut fiber weight fractions of 5%, 15%, and 25%. Tensile testing revealed that the highest tensile strength (70.92 MPa) was achieved at 15% fiber content, while 5% fiber content resulted in the lowest tensile strength (32.48 MPa). Scanning Electron Microscopy (SEM) and metallographic analyses showed variations in fiber-matrix bonding, with debonding and fiber pull-out observed at lower fiber content. The results suggest that optimal fiber-matrix bonding and fiber dispersion contribute to tensile strength enhancement, confirming the potential of coconut fiber-reinforced hybrid composites for structural applications