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All Journal Jurnal Teknik Mesin
Imran Musanif
Jurusan Teknik Mesin, Politeknik Negeri Manado
Automotive Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Fraksi Serat terhadap Kekuatan Impak pada Lapisan Luar Komposit Honeycomb Jesaya Imanuel Soni Junior Pondaag; Imran Musanif; Artian Sirun
Jurnal Teknik Mesin Vol. 19 No. 1 (2026): Jurnal Teknik Mesin (In Press)
Publisher : Politeknik Negeri Padang

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Abstract

Sandwich composites with a bamboo honeycomb core and coconut coir fibre face plates offer an alternative for lightweight structures that must absorb impact energy. This study examines the effect of coir fibre volume fraction in the face plate on the impact energy and impact strength of the composite. Fibres were alkali-treated in sodium hydroxide for one hour, then moulded with epoxy resin into 2 mm face plates at volume fractions of 30%, 40% and 50%. The core was assembled from bamboo strips into hexagonal cells of 10 mm cell side, 20 mm wall height and 1 mm wall thickness. Testing followed the Izod method of ASTM D256 with three specimens per fraction, and impact strength was taken as absorbed energy divided by the 136 mm² cross-section. Mean impact energy reached 6.93 J at 30%, 9.67 J at 40% and 7.50 J at 50%, equivalent to impact strengths of 0.0510, 0.0711 and 0.0551 J/mm². Scatter was wide, with standard deviations of 2.52, 5.80 and 3.32 J, and one-way analysis of variance gave F(2,6) = 0.37 (p = 0.71). The 40% composition is therefore best read as a working indication that needs confirmation with more specimens and tighter process control.
Pengaruh Fraksi Volume Face Plate terhadap Kekuatan Impak Komposit Honeycomb Sabut Kelapa Adji Pramono Wirayudha; Adrian Maidangkay; Imran Musanif
Jurnal Teknik Mesin Vol. 19 No. 1 (2026): Jurnal Teknik Mesin (In Press)
Publisher : Politeknik Negeri Padang

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Abstract

The face plate of a sandwich composite receives the impact load first and transfers it to the core, so its proportion within the structure governs how much energy the whole structure can absorb. This study examines the effect of face plate volume fraction on the impact energy and impact strength of a honeycomb composite reinforced with coconut coir fibre. Face plate volume fractions of 30%, 40% and 50% were tested while the honeycomb core fraction was held at 30%. Each specimen combined two 20.1 mm wide, 2 mm thick face plates with two 10 mm high, 2 mm thick cell walls, giving a cross-sectional area of 120.4 mm². Testing followed the Izod method of ASTM D256 on an XJ-300A pendulum tester with a 29.4 J capacity released from 150°, using three specimens per fraction. Mean absorbed energy was 9.80 J at 30%, 15.67 J at 40% and 14.67 J at 50%, giving impact strengths of 0.0814, 0.1301 and 0.1218 J/mm². Raising the fraction from 30% to 40% increased impact strength by 59.9%, while a further rise to 50% reduced it by 6.4%. The relationship is therefore non-linear, and 40% gave the highest value among the fractions tested. One-way analysis of variance gave F(2,6) = 3.51 (p = 0.10), which falls short of significance at the 5% level, so the result is best treated as a strong indication rather than a settled optimum.
Co-Authors Adji Pramono Wirayudha Adrian Maidangkay Artian Sirun Jesaya Imanuel Soni Junior Pondaag