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All Journal Rekayasa Mesin JURNAL FLYWHEEL
Sonief, Ahmad As'ad
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Energy Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Alkalisasi Komposit Serat Kelapa-Poliester Terhadap Kekuatan Tarik Maryanti, Budha; Sonief, Ahmad As'ad; Wahyudi, Slamet
Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.073 KB)

Abstract

The purpose of this research is to analyze the effect of alkalization on the tensile strength and strain of coconut fiber composites with polyester matrix by varying the concentration of NaOH as follow 0%, 2%, 5% and 8%. Alkalization is one of modifications natural fibers to improve fiber-matrix compatibility.The method of this research used a hands lay-up method. As follow the 1st coconut fiber treated without alkalization or 0% alkalization and the 2nd coconut fiber immersed in alkaline solution (2%, 5% and 8% NaOH) for 1 hour. Then, each treatment specimen molded to composite according to standard tensile test ASTM D638 –I. Coconut fiber volume fraction 30% and 70% polyester, and arranged coconut fiber straightly. And used the matrix polyester resin type 157 BTQN with hardener MEKPO 1%.The results of this research showed that coconut fiber reinforced composites with NaOH concentrations of 0%, 2%, 5% and 8% respectively has a tensile strength that is 90,144 MPa, 93.75 MPa, 97,356 MPa and 94,151 MPa. The optimum concentration limit of 5% NaOH produced the highest tensile strength 97,356 MPa, while the composite of coconut fiber without alkalization has the lowest tensile strength 90,144 MPa. Keywords: coconut fiber-polyester composites, alkalization, tensile strength
Kekerasan Hot Rolled Plate Steel Lokaltebal 10 mm Dengan Proses Quench dan Temper Taufik, Achmad; Pratikto; Suprapto, Agus; Sonief, Ahmad As'ad
JURNAL FLYWHEEL Vol 9 No 1 (2018): Jurnal Flywheel
Publisher : Teknik Mesin S1 ITN Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/flywheel.v9i1.2551

Abstract

Kekerasan merupakan fenomena yang diamati pada baja HRPS. Penelitian ini, dilakukan dengan cara perlakuan panas quench dan temper,dengan menganalisis kekerasan dari suatu material, menggunakan uji kekerasan Hardness tester. Kekerasan diidentifikasi dari sifat perubahan yang ditunjukkan oleh data hasil uji kekerasan. Hasil penelitian memperlihatkan bahwa, terjadi kekerasan yang semakin meningkat pengaruh dari tingkat pemanasan. Proses perlakuan panas quench-temper pada baja HRPS memiliki pengaruh yang jelas terhadap perubahan struktur dan sifat mekanik baja HRPS.
Co-Authors Achmad Taufik Agus Suprapto Budha Maryanti MARIA BINTANG Slamet Wahyudi