Abstract. This present work investigated the perforated impact strength of woven kenaf fiber reinforced composites subjected to different projectile velocities. Three layers of woven kenaf mats were stacked with four different fiber orientations 0, 15, 30 and 45 0 . The composites are fabricated using hand-layout where the woven mats were placed into the mould with a polymeric resin. The wetted composites were compressed to squeeze out the excessive resin and to eliminate the void contents. The hardened samples were shaped into a standard geometry specified by ASTM D3763. Then, the composites were perforated impact using different speeds 1, 2 and 3 m/s. According to the present results, it was found that the perforated impact strength reduced when the impact velocity was increased. However, the impact strength of 15 0 oriented composite was higher when compared with other types of composites.
The purpose of this study was to determine the effect of PVAc adhesive composition on the physical and mechanical properties of the composite boards of palm oil stems and determine the best test example from a technical and economic point of view. This research will be carried out at the Banjarbaru Forestry Faculty Workshop. Research time ± 3. There are 3 levels (levels) of the PVAc adhesive composition tested, namely 40%, 45%, and 50%. The parameters of the composite board properties studied were physical properties, including: Moisture content and density, as well as the mechanical properties that fracture strength (MoR) and modulus of elasticity (MOE). The results showed that the physical and mechanical properties of composite boards were strongly influenced by the adhesive composition, the more the adhesive composition is used, the better the composite board properties, especially in terms of water content and MoR, where the results show that the water content is decreasing and the MoR is increasing. Nevertheless the use of a 40% adhesive composition has been able to produce a composite board that can meet SNI standards No. 03-2105 2006. Properties of palm oil stem waste composite boards made with PVAc adhesive (Crosslink X-PVAc) moisture content ranged from 9.49% - 13.07%, density 0.494 - 0.559 gr / cm³, and MoR 20.613 - 22.483 kg / cm².Tujuan penelitian untuk mengetahui pengaruh komposisi perekat PVAc terhadap sifat fisis dan mekanis papan komposit dari batang kelapa sawit dan menentukan contoh uji yang terbaik dari segi teknis. Penelitian ini dilaksanakan di Workshop Fakultas Kehutanan Banjarbaru. Waktu penelitian ±3. Ada 3 taraf (level) dari perlakuan komposisi perekat PVAc yang diuji cobakan, yaitu 40%, 45%, dan 50%. Adapun parameter sifat papan komposit yang diteliti adalah sifat fisis, meliputi: Kadar air dan kerapatan, serta sifat mekanisya itu keteguhan patah (MoR) dan keteguhan lentur (MOE). Hasil penelitian menunjukkan bahwa sifat fisis dan mekanis papan komposit sangat dipengaruhi oleh komposisi perekat, semakin bertambah komposisi perekat yang digunakan maka sifat papan komposit semakin baik, terutama ditinjau dari kadar air dan MoR, dimana hasil menunjukkan bahwa kadar air semakin berkurang dan MoR makin meningkat. Meskipun demikian penggunaan komposisi perekat 40% sudah dapat menghasilkan papan komposit yang dapat memenihi standar SNI no 03-2105 2006. Sifat papan komposit limbah batang kelapa sawit yang dibuat dengan perekat PVAc (Crosslink X-PVAc) kadar air berkisar 9,49% – 13,07%, Kerapatan 0,494 - 0.559 gr/cm³, dan MoR 20.613 – 22.483 kg/cm².
Aim: Electric fluctuations in the developing world are common and may affect dental composite curing. We determined the effect of variable voltage and increasing thickness of different shades of composite on its depth-of-cure. Materials and methods: ISO scrapping method was used on 14 commonly used shades of Esthet-X HD composites. Student's t-test and ANOVA were applied to compare the mean depth-of-cure and a linear regression model was developed using variables voltage (180 V and 220 V), material thickness (2, 4 and 6 mm) and shades (n = 14). Results: The mean curing depth of samples was significantly reduced at 180 volts compared to 220 volts (p-value <0.002). At thickness of 2 mm, all samples were fully cured but when it was raised to 4 mm, the depth-of-cure reduced to 1.86 mm ± 0.06; while at 6 mm thickness, it reached to 1.96 mm ± 0.06 (p-value < 0.001). Conclusion: Around 82% variation in the depth-of-cure is explained by voltage, thickness and shade of composite material (p-value <0.001). Clinical significance: Electric fluctuations are prevalent in the developing world and thus poor voltage flow is responsible for dental composite's inadequate polymerization.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.