The purpose of this research was to determine the critical length of the king pineapple leaf fiber (KPLF) due to fumigation treatment with time variations. To determine the critical length is done by pull out test. The pull-out test was conducted to determine the adhesive properties of the KPLF interface with the epoxy matrix by implanting KPLF without and with the fuming treatment into the epoxy matrix then being withdrawn with a certain load and in quantity it can provide tensile stress information which can then be converted into a shear stress fiber with epoxy matrix. The measurement results show the effect of fogging treatment for 15 hours on KPLF, can increase the shear stress of the epoxy matrix interface by 16.75 MPa with a length of 1 mm and a critical length of 4,53 mm.
This article explains usage of the ultraviolet irradiation method on Beauv cylindrical (L) imperata fibers as a new way of natural fiber treatment, based on the absorption of ultraviolet rays containing other elements that lead to lignin degradation, which enhances natural fiber strength. Using the ultraviolet exposed fiber method with intervals of 10, 20, 50, and 100 hours, each treatment was tested with scanning electron microscope-energy dispersive spectroscope. The authors found that the treatment resulted in an increase in the fiber’s tensile strength. The results of fiber treatment with 50-hour irradiation produced a fiber with a tensile strength of 130.2 MPa. Our method allows an increase in the AL2O3 element, which indicates an increase in fiber tensile strength of 130.2 Pa. An evaluation of the effectiveness of the new method can be seen in the scanning electron microscope-energy dispersive spectroscope test results. The Imperata Cylindrica (L) Beauv fiber surface roughness test results showed an increase in surface roughness to 1.47 μm resulting from the 50-hour ultraviolet treatment. With this roughness, the adhesion between the fiber and epoxy resin increases. This increased fiber tensile strength and surface roughness, as a result of ultraviolet light treatment, offers the potential for its use as a composite reinforcement.
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