| dc.contributor.advisor | SOSIATI, HARINI | |
| dc.contributor.advisor | BUDIYANTORO, CAHYO | |
| dc.contributor.author | NUR, HAQQY ARIFIN | |
| dc.date.accessioned | 2020-02-28T02:47:15Z | |
| dc.date.available | 2020-02-28T02:47:15Z | |
| dc.date.issued | 2019-07-19 | |
| dc.identifier.uri | http://repository.umy.ac.id/handle/123456789/32109 | |
| dc.description | Komposit berpenguat serat alam kenaf (Hibiscus Cannabinus) sudah banyak
dikembangkan dalam dunia industri otomotif khususnya pada interior maupun exterior
mobil. Namun, untuk aplikasi otomotif, sifat mekanis dari komposit berpenguat serat
alam harus ditingkatkan. Salah satu cara untuk meningkatkan sifat mekanis komposit
yaitu dengan menggunakan metode hibridisasi. Penelitian ini bertujuan untuk membuat
komposit hibrida kenaf/ silica fume/ epoksi serta mengetahui pengaruh fraksi volume
filler (kenaf dan silica fume) pada sifat mekanis bending dan impak, serta sifat fisis water
absorption.
Dalam penelitian ini, komposit hibrida kenaf / silica fume / epoksi di fabrikasi
dengan mesin hot press molding pada suhu 100oC dengan tekanan untuk spesimen
bending sebesar 1.449 MPa dan untuk spesimen impak sebesar 0,967 MPa. Serat kenaf di
alkalisasi dengan NaOH 6% selama 36 jam kemudian di potong dengan panjang 5 mm.
Variasi dilakuakan pada perbandingan fraksi volume serat yaitu 15, 20, dan 30 %.
Partikel silica yang digunakan yaitu sebesar 2 % dengan ukuran 37 μm (400
mesh).Pengujian mekanis yang dilakukan adalah uji impak dan bending yang masingmasing
mengacu pada standar ASTM D6110 dan ASTM D790. Pengujian fisis yang
dilakukan adalah uji daya serap air yang mengacu standar pada ASTM D570-98 dengan
waktu perendaman 216 jam. Patahan komposit hasil uji impak dikarakterisasi
menggunakan microskop optik untuk mengetahui persebaran serat dan menggunakan
scanning electron microscopy (SEM) untuk mengetahui struktur mikro.
Hasil penelitian menunjukkan bahwa kekuatan impak tertinggi (7,49 kJ/ m²),
kekuatan bending tertinggi (59.180 MPa), dan modulus elastisitas ( 4.658 GPa) dicapai
oleh komposit hibrida dengan fraksi volume serat 30%. Namun, presentase penyerapan
air terendah (6,14%) dimiliki oleh komposit hibrida dengan fraksi volume serat 15%. | en_US |
| dc.description.abstract | Composite reinforced with kenaf fiber (Hibiscus Cannabinus) has been developed
in the automotive industry specifically for interior and exterior cars. However, for the
automotive application, the mechanical properties of the natural fiber composite have to
improve. Manufacturing the hybrid composite is one of the ways to enhance the
mechanical properties of the composite. In this research, the hybrid composites of
kenaf/silica-fume/as epoxy were fabricated to study the effects of volume fraction of the
fillers (kenaf and silica- fume) on bending and impact properties of the composites, and
also water absorption and thickness swelling properties.
In this research, alkali-treated kenaf/silica-fume/epoxy hybrid composites were
fabricated using a hot press molding, at 100oC, and the pressure of 1,449 MPa and 0.967
MPa for bending and impact specimens, respectively. Kenaf fibers were alkali-treated by
soaking in 6% NaOH for 36 h and then chopped into ± 5 mm length. The ratio of volume
fraction of kenaf fiber used is 15, 20 and 30%. Silica particles used were 2% with a size
of 37 μm (400 mesh). Impact and bending tests of the composite specimens were
conducted according to ASTM D6110 and ASTM D790, respectively. Physical
examination of water absorption and thickness swelling was carried out according to
ASTM D570-98 with a soaking time of 216 h. The impact fracture surface of the
composite specimens was characterized by scanning electron microscopy (SEM), and the
fiber distribution was observed with an optical microscope.
The results showed that the highest impact strength, bending strength, and
modulus of elasticity are 7.49 kJ / m², 59,180 MPa, and 4,658 GPa, respectively, that
were obtained from the hybrid composites with 30% fiber content. However, the lowest
water absorption of 6.14% resulted from the hybrid composites with 15% fiber content | en_US |
| dc.publisher | FAKULTAS TEKNIK UNIVERSITAS MUHAMMADIYAH YOGYAKARTA | en_US |
| dc.subject | epoxy, kenaf, silica fume, impact test, bending test, water absorption, optical, scanning electron microscopy (SEM). | en_US |
| dc.title | PENGARUH FRAKSI VOLUME SERAT TERHADAP SIFAT MEKANIS DAN FISIS KOMPOSIT HIBRID KENAF/ SILICA FUME /EPOXY | en_US |
| dc.type | Thesis SKR FT 645 | en_US |
