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Dharta, Yuli
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PENGARUH FRAKSI VOLUME DAN VARIASI PERENDAMAN NaOH TERHADAP KEKUATAN TARIK DAN IMPAK KOMPOSIT BERPENGUAT SERAT AMPAS TEBU Sanjaya, Aden; Juanda, Juanda; Dharta, yuli
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 2 No. 01 (2022): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

This study aims to determine the effect of the duration of immersion of NaOH and the optimal volume fraction of bagasse fiber on tensile strength and impact strength by using Polyester Resin using hand lay-up composite molding method. The object of research is bagasse fiber composites with variations in NaOH immersion and volume fraction. The highest tensile strength in the composite fiber immersion variation for 2 hours with a volume fraction of 15% is 22.3 MPa. Meanwhile, for tilapia the highest impact strength was in the 2-hour fiber immersion variation with 5% bagasse fiber volume fraction of 0.272 J/mm². Meanwhile, the lowest tensile strength is found in the 5% volume fraction, which is 12.8 MPa. And for the lowest strength impact test value in the 15% fraction, which is 0.0113 J/mm².
PENGARUH VARIASI ARAH SERAT DAN FRAKSI VOLUME SERAT PANDAN DURI TERHADAP KEKUATAN TARIK DAN IMPAK SEBAGAI MATERIAL ALTERNATIF HELM SNI Rachman, Aditya; Juanda, Juanda; Dharta, yuli
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 2 No. 01 (2022): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Pandan thorn with the term (Pandanus tectorius) is a bush plant with climbing stems and has a height of 11 m. This research was conducted to obtain data on the tensile strength and impact strength of pandan thorn fiber with variations in fiber direction and volume fraction. This research is expected to be useful for SNI helmet materials. The maximum value of tensile strength is 41.33 MPa in the vertical fiber direction and the fiber volume fraction is 12.5%. While the lowest tensile strength value is 8.44 MPa using horizontal fiber direction with a fiber volume fraction of 7.5%. The largest impact strength is 0.0616 J/mm2 in the vertical direction of fiber with a fiber volume fraction of 12.5% and the smallest impact strength is 0.0216 J/mm2 in the horizontal fiber direction with a fiber volume fraction of 7.5%. In this test, compared with the results of the tensile and impact strength testing of SNI helmets of 33.93 MPa and 0.00972 J/mm2, the specimens passed the material test for SNI helmets.
Pengaruh Parameter Pemesinan CNC Bubut Terhadap MRR dan Kekasaran Permukaan Material ST 37 Menggunakan Metode Taguchi Rifqhi Syahputra, Nova; Oktriadi, Yudi; Dharta, Yuli
Jurnal Inovasi Teknologi Terapan Vol. 4 No. 1 (2026): Jurnal Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/jitt.v4i1.404

Abstract

The machining process in the manufacturing world greatly influences its quality and productivity. One of the tools in the machining process is a CNC lathe that has parameters for its use process. The process parameters in the CNC machining process are spindle speed, feed rate, and cutting depth. Some aspects that are greatly influenced by process parameters are surface roughness and MRR (Material Removal Rate), which function as efficiency in improving product quality. This study aims to analyse the effect of machining process parameters on surface roughness and MRR on test specimens made of ST 37 material. The method in this study uses the Taguchi method with the aim of increasing productivity and product and process quality. The results of this study show surface roughness based on the use of two types of tools on ST 37 material, with the DNMG 105608-MA tool producing a roughness value of 1.128 µm and the CNMG tool producing a value of 0.865 µm. Meanwhile, the MRR value produced by the DNMG 105608-MA tool is 1,072.8 mm³/s, which is slightly superior to that of the CNMG 120408-MK tool, with an MRR value of 1,032.5 mm³/s.
Co-Authors ., Yudhi Aditya Rachman, Aditya Amana, Wahyu Ariyanto Ariyanto Arsieka Putri, Diviya Clara Lavita Angelina Eko Yudo Erwansyah, Erwansyah Harita, Revival Praise Hasdiansah, Hasdiansah Hera, Hera Husman Husman Ilham Ary Wahyudie Juanda Juanda Kusuma, Sultan Chandra Maulid, Rahmat Ocsirendi Oktriadi, Yudi Parlindungan, Devaned Pratama, Aldi Pratama, Randa Julio Rifqhi Syahputra, Nova Robert Napitupulu Sanjaya, Aden Saputra, Gillang Subkhan Subkhan Sugiyarto Sugiyarto Sukanto Sukanto Suzen, Zaldy Sirwansyah Tuparjono . Yuliyanto Yuliyanto Yuliyanto Zulfitriyanto, Zulfitriyanto