PENGARUH PANJANG SERAT TERTANAM TERHADAP KEKUATAN GESER INTERFACIAL KOMPOSIT SERAT BATANG MELINJO-MATRIKS RESIN EPOXY

This research is aimed to understand the effect of length-embedded fibres to interfacial shear strength on epoxy resin composite reinforced “melinjo” stem fibres. Pull-out testing was performed with variation of length-embedded fibres including 1 mm, 3mm, and 5mm. Prior to pull-out testing, fibres were treated with boiling with water media and 5% NaOH media. The results showed that fibres with surface treatment using boiling of 5%NaoH have higher interfacial fibre shear strength, but fibres without surface treatment have lower interfacial fibre shear strength. For length - embedded fibre, the highest  interfacial fibre shear strength were obtained on the length-embedded fibre respectively from 1 mm, then 3 mm and 5mm

SIFAT MAMPU BASAH (WETTABILTY) SERAT BATANG MELINJO (GNETUM GNEMON) SEBAGAI PENGUAT KOMPOSIT MATRIKS EPOXY-RESIN

This study aims to knowing the influence of surface treatment of fibers t wettability and adhesion ability melinjo bast fiber with epoxy-resin matrix. Wettability  had affected on mechanical properties of fiber reinforced composite. The research process was begun with providing treatment to the melinjo fiber surface, which is boiled with pure water and NaOH 5%  each for 60, 120 and 180 minutes. Contact angle specimen test conducted by dripping droplets of matrix on a single fiber, then the contact angle that occurs is measured using Image Pro Analyzer software (IPWin) through photographs taken by using optical microscope. The results showed that the largest  average of contact angle is  untreated fiber (42.37°) and the lowest is  media treatment of NaOH 5% (33.14°)

EVALUATION OF MECHANICAL PROPERTIES OF COIR-ANGUSTIFOLIA HAW AGAVE FIBER REINFORCED HYBRID EPOXY COMPOSITE

This article presents the mechanical properties of coir-angustifolia Hawagave fiber hybrid composite. Prior to form composite, these fibers were soaked in 5%w/v NaOH solution during 24 hours. Coir fibers were twisted and composed one direction like mat and agave fibers were also composed one direction and formed mat. Epoxy resin was used as matrix in this hybrid composite.The hybrid composites were manufactured using hand layup technique followed by compression molding. The variation of fraction volume of coir fiber and agave fiber was 10:20, 15:15 and 20:10 respectively. The tensile strength, tensile modulus, flexural  strength and flexural modulus were evaluated. Fracture tensile was analysed by Scanning Electronic Microscopy (SEM). Result showed that 15%Vf coir and 15% Vf agave fibers on the hybrid composite yield high tensile strength, tensile modulus and flexural modulus compared to other fraction volume. SEM analysis exhibits that all fraction volume variations on the composite tend to undergo fiber fracture without pull-out and matrix damage.Keywords : hybrid composite,  coir fiber, angustifolia Haw agave fiber, matrix, mechanical properties

PENGARUH FRAKSI VOLUME TERHADAP KEKUATAN GESER KOMPOSIT SERAT BUAH KELAPA SAWIT

Influence Of Volume Fraction On Shearing Strength Of Composite Of Palm Fruit Fiber. This study aims to determine the shear strength and the effect of water absorption of oil palm fruit fiber composites with volume fraction variations while fiber volume fractions were 10%, 20%, 30% and 40%. The method used in this research is experimentally using a composite material made from palm fruit fiber with a polyester matrix. Compost testing includes shear testing referring to ASTM D5379. The results of the study of shear strength testing on the composite of oil palm fiber found that the highest shear value was found in the 20% fiber volume fraction, which was 20.04 MPa, the lowest at 40% fiber volume fraction, which was 16.45 MPa.Keywords: Composite, palm fruit fiber, shear strength, water absorption polyeste

PENGARUH LINGKUNGAN KOMPOSIT SERAT SABUT KELAPA UNTUK APLIKASI BALING-BALING KINCIR ANGIN

Abstract: Environmetal Effect of Tensile, Modulus and Shear Strength of Coir Fibre Composite. The aim of this research is to know the environmetal effect of tensile, modulus and shear strength of coir fibre composite. In this research, coir is used as reinforcement and matrix uses epoxy resin. Coir is soaked in water with 5% NaOH during 24 hours. Composite is moulded with 17 % fibre volume fraction and 83% matrix volume fraction. Then, the tensile specimen used ASTM D638-02 and shear specimen used ASTM D5379 standard. Universal Testing Machine is used to test of these spesimens. The specimens of tensile and shear include without and with treatment to environmental influence during 10, 20, and 30 days. The result shows that tensile strength, modulus and shear strength  of  specimen treatment during 10, 20, 30 days are not significantly decreased   from  specimen without treatment. This result can be used as recommadation for material of wind blade for the future.   Keywords: composites, coir fiber, shear strength, tensile strengt

ENGARUH WAKTU PENGELASAN ALUMINIUM TERHADAP KEKUATAN BENDING PADA HASIL FRICTION WELDING

This study aims to determine the magnitude of the influence of time during friction, between aluminum that has been given a microstructure by the Friction welding method, to determine the level of strength and structure of the joints tested by bending techniques, the tool used to test the strength level of aluminum is a lathe with material specimens. The aluminum used is 6063 T5, after the specimen is carried out using a lathe, a bending test is carried out to determine the hardness of the microstructure. The test was carried out in the materials testing laboratory, majoring in mechanical engineering, faculty of engineering. Based on the results of the bending test, the highest level in 90 seconds gets a value of 523.92 MPa followed by the lowest time which is 30 seconds which gets a value of 476.73 MPa while the second test time is 60 seconds. The welding technique using the friction welding method with a friction time of 60 seconds gets a value of 498.93 MPa. Meanwhile, the strength of the aluminum friction within 90 seconds obtained a value of 37.282 kg/mm2 followed by friction with a second vulnerable time of 60 seconds which obtained a strength value of 36.622 kg/mm2. While the lowest strength value  is found within 30 seconds which gets a strength value of 35.665 kg/mm2. The results of microstructure observations due to the small friction time the microstructure still looks large compared to the long friction time given to the specimen, the microstructure is getting smaller and coalesces in the interface area