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All Journal Jurnal MEKANIKAL Rekayasa Mesin Jurnal Teknik Mesin Indonesia International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Jurnal Abmas Negeri (JAGRI)
Sri Chandrabakty
Program Sarjana Teknik Mesin, FakultasTeknik, Universitas Tadulako
Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Other

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PENGARUH LINGKUNGAN KOMPOSIT SERAT SABUT KELAPA UNTUK APLIKASI BALING-BALING KINCIR ANGIN Bakri, Bakri; Chandrabakty, Sri; Alfriansyah, Alfriansyah; Tahir, Mohammad
Jurnal MEKANIKAL Vol 5, No 1 (2014)
Publisher : Jurnal MEKANIKAL

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Abstract

Abstract: Environmetal Effect of Tensile, Modulus and Shear Strength of Coir Fibre Composite. The aim of this research is to know the environmetal effect of tensile, modulus and shear strength of coir fibre composite. In this research, coir is used as reinforcement and matrix uses epoxy resin. Coir is soaked in water with 5% NaOH during 24 hours. Composite is moulded with 17 % fibre volume fraction and 83% matrix volume fraction. Then, the tensile specimen used ASTM D638-02 and shear specimen used ASTM D5379 standard. Universal Testing Machine is used to test of these spesimens. The specimens of tensile and shear include without and with treatment to environmental influence during 10, 20, and 30 days. The result shows that tensile strength, modulus and shear strength  of  specimen treatment during 10, 20, 30 days are not significantly decreased   from  specimen without treatment. This result can be used as recommadation for material of wind blade for the future.   Keywords: composites, coir fiber, shear strength, tensile strength
SIFAT MAMPU BASAH (WETTABILTY) SERAT BATANG MELINJO (GNETUM GNEMON) SEBAGAI PENGUAT KOMPOSIT MATRIKS EPOXY-RESIN Chandrabakty, Sri
Jurnal MEKANIKAL Vol 1, No 1 (2010)
Publisher : Jurnal MEKANIKAL

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Abstract

This study aims to knowing the influence of surface treatment of fibers t wettability and adhesion ability melinjo bast fiber with epoxy-resin matrix. Wettability  had affected on mechanical properties of fiber reinforced composite. The research process was begun with providing treatment to the melinjo fiber surface, which is boiled with pure water and NaOH 5%  each for 60, 120 and 180 minutes. Contact angle specimen test conducted by dripping droplets of matrix on a single fiber, then the contact angle that occurs is measured using Image Pro Analyzer software (IPWin) through photographs taken by using optical microscope. The results showed that the largest  average of contact angle is  untreated fiber (42.37°) and the lowest is  media treatment of NaOH 5% (33.14°).
PENGARUH PANJANG SERAT TERTANAM TERHADAP KEKUATAN GESER INTERFACIAL KOMPOSIT SERAT BATANG MELINJO-MATRIKS RESIN EPOXY Chandrabakty, Sri
Jurnal MEKANIKAL Vol 2, No 1 (2011)
Publisher : Jurnal MEKANIKAL

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Abstract

This research is aimed to understand the effect of length-embedded fibres to interfacial shear strength on epoxy resin composite reinforced “melinjo” stem fibres. Pull-out testing was performed with variation of length-embedded fibres including 1 mm, 3mm, and 5mm. Prior to pull-out testing, fibres were treated with boiling with water media and 5% NaOH media. The results showed that fibres with surface treatment using boiling of 5%NaoH have higher interfacial fibre shear strength, but fibres without surface treatment have lower interfacial fibre shear strength. For length - embedded fibre, the highest  interfacial fibre shear strength were obtained on the length-embedded fibre respectively from 1 mm, then 3 mm and 5mm.
EVALUATION OF MECHANICAL PROPERTIES OF COIR-ANGUSTIFOLIA HAW AGAVE FIBER REINFORCED HYBRID EPOXY COMPOSITE Bakri, Bakri; Chandrabakty, Sri; Putra, Kusuma Angga
Jurnal MEKANIKAL Vol 8, No 1 (2017): Jurnal Mekanikal Januari 2017
Publisher : Jurnal MEKANIKAL

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Abstract

This article presents the mechanical properties of coir-angustifolia Hawagave fiber hybrid composite. Prior to form composite, these fibers were soaked in 5%w/v NaOH solution during 24 hours. Coir fibers were twisted and composed one direction like mat and agave fibers were also composed one direction and formed mat. Epoxy resin was used as matrix in this hybrid composite.The hybrid composites were manufactured using hand layup technique followed by compression molding. The variation of fraction volume of coir fiber and agave fiber was 10:20, 15:15 and 20:10 respectively. The tensile strength, tensile modulus, flexural  strength and flexural modulus were evaluated. Fracture tensile was analysed by Scanning Electronic Microscopy (SEM). Result showed that 15%Vf coir and 15% Vf agave fibers on the hybrid composite yield high tensile strength, tensile modulus and flexural modulus compared to other fraction volume. SEM analysis exhibits that all fraction volume variations on the composite tend to undergo fiber fracture without pull-out and matrix damage.Keywords : hybrid composite,  coir fiber, angustifolia Haw agave fiber, matrix, mechanical properties.
Pengaruh pack carburizing media arang tempurung kelapa terhadap ketahanan aus baja komersial dengan variasi pelumas.pdf Wahyu Richard Nugraha; Muhammad Iqbal; Sri Chandrabakty
Jurnal Teknik Mesin Indonesia Vol 13 No 1 (2018): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (494.211 KB) | DOI: 10.36289/jtmi.v13i1.86

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh pack carburizing media arang tempurung terhadap ketahanan aus baja komersial dengan variasi pelumas. Media karbon yang digunakan yaitu arang tempurung kelapa. Proses pack carburizing dilakukan pada temperatur 950oC dengan quenching media air dan tempering dengan suhu 200oC, setelah proses pack carburizing kemudian dilakukan pengujian keausan dengan variasi pelumas SAE 40, SAE 90, SAE 140 dan juga tanpa pelumas (TP). Laju keausan pada spesimen yang mengalami proses pack carburizing untuk pengujian SAE 40 dan SAE 90 sebesar 0,08% dengan faktor keausan sebesar 0,00193 mm3/N.km dan 0,00202 mm3/N.km, kemudian untuk pengujian SAE 140 laju keausan sebesar 0,05% dan faktor keausan sebesar 0,00128 mm3/N.km, serta untuk pengujian tanpa pelumas (TP) sebesar 0,31% dan faktor keausan sebesar 0,00807 mm3/N.km. Sedangkan pengujian raw material pada pengujian SAE 40 laju keausan dan faktor keausan sebesar 0,19% dan 0,00504 mm3/N.km, untuk hasil pengujian SAE 90 sebesar 0,21% dan 0,00541 mm3/N.km, serta hasil laju keausan pengujian SAE 140 sebesar 0,0,18% dengan faktor keausan sebesar 0,00459 mm3/N.km kemudian pengujian tanpa pelumas (TP) sebesar 3,59% dengan faktor keausan sebesar 0,09537 mm3/N.km
Pelatihan Penggunaan Mesin Hot-Press untuk Daur Ulang Sampah Plastik di Bank Sampah Navoe Kelurahan Taipa Anwar, Khairil; Bakri, Bakri; Chandrabakty, Sri; Naharuddin, Naharuddin
Jurnal Abmas Negeri (JAGRI) Vol. 5 No. 1 (2024): Volume 5 Nomor 1 Juni 2024
Publisher : Sarana Ilmu Indonesia (salnesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36590/jagri.v5i1.808

Abstract

ditangani dengan metode yang efektif, sekaligus dapat memberikan dampak peningkatan ekonomi bagi masyarakat. Kegiatan pengabdian masyarakat ini bertujuan untuk ikut berkontribusi dalam mengurangi dampak negatif dari sampah plastik dan meningkatkan kesadaran masyarakat mengenai pentingnya daur ulang. Kegiatan ini dilaksanakan di Bank Sampah Navoe di Kelurahan Taipa melalui pelatihan penggunaan mesin hot-press dalam proses daur ulang sampah plastik. Kegiatan ini meliputi beberapa tahap, mulai dari penyuluhan, pelatihan, praktek dan pendampingan. Produk hasil daur ulang yang dihasilkan diharapkan dapat menjadi produk olahan sampah yang dapat bernilai ekonomis, menciptakan sumber pendapatan untuk mendukung operasional bank sampah dan program-program lingkungan lainnya di kelurahan Taipa. Hasil dari pengabdian ini menunjukkan bahwa penggunaan mesin hot-press secara signifikan meningkatkan efisiensi dalam proses daur ulang sampah plastik dan mengurangi volume sampah yang harus dibuang ke tempat pembuangan akhir. Selain itu, inisiatif ini membantu menciptakan kesadaran lingkungan di masyarakat sekitar, mendukung prinsip-prinsip daur ulang, dan memberikan manfaat ekonomi kepada bank sampah dan masyarakat di Kelurahan Taipa. Manfaat dari pengabdian ini menunjukkan dampak positif penggunaan teknologi dalam upaya berkelanjutan untuk mengatasi masalah sampah plastik.
Peningkatan Kompetensi Pengelasan Karyawan Bengkel Las di Desa Sibedi Kecamatan Marawola Kabupaten Sigi Anwar, Khairil; Hamzah, Muhammad Sadat; Chandrabakty, Sri; Bakri, Bakri; Rusdi, M
Jurnal Abmas Negeri (JAGRI) Vol. 5 No. 2 (2024): Volume 5 Nomor 2 Desember 2024
Publisher : Sarana Ilmu Indonesia (salnesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36590/jagri.v5i2.1242

Abstract

Program pengabdian masyarakat ini bertujuan untuk meningkatkan kompetensi pengelasan karyawan Bengkel Arema di Desa Sibedi, Kecamatan Marawola, Kabupaten Sigi, yang meskipun telah memiliki keterampilan dasar, masih minim pengetahuan terkait teknik pengelasan yang benar, pemanfaatan teknologi pengelasan, dan penerapan Kesehatan dan Keselamatan Kerja (K3). Metode pelaksanaan meliputi penyuluhan, bimbingan teknis, pendampingan, dan pembinaan dengan pendekatan partisipatif, melibatkan kelompok sasaran secara aktif dalam setiap tahap kegiatan. Hasil program menunjukkan adanya peningkatan rata-rata nilai pengetahuan peserta dari 65 pada pre-test menjadi 85 pada post-test, serta 90% hasil las peserta lolos uji kualitas penetrant test tanpa cacat signifikan. Meskipun demikian, ditemukan beberapa tantangan, seperti perbedaan tingkat pengalaman peserta yang memengaruhi hasil praktik dan keterbatasan alat yang tersedia di lapangan. Program ini memberikan dampak signifikan bagi ekonomi lokal, dengan karyawan bengkel lebih percaya diri menerima proyek yang lebih kompleks, serta meningkatkan daya saing usaha mereka di pasar lokal. Selain itu, penerapan K3 yang diperkuat melalui program ini menciptakan lingkungan kerja yang lebih aman, meningkatkan produktivitas dan kesejahteraan karyawan.
PERFORATION AND PENETRATION OF FIBER METAL LAMINATES TARGET BY HEMISPHERICAL PROJECTILE Fadly, Muhammad Syaiful; Purnowidodo, Anindito; Setyarini, Putu Hadi; Bakri, Bakri; Chandrabakty, Sri
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 2 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.02.8

Abstract

This study aims to examine the phenomena that occur due to projectile penetration on fiber metal laminate. Ballistic testing was carried out experimentally according to National Institute of Justice standards (NIJ Standard 0101.06 level III-A) using a 9 mm full-metal jacket projectile with a normal angle of attack (90° to the target). The results showed that fiber metal laminate could withstand the projectile rate by penetrating the first layer (aluminum plate) and the second layer (aramid/epoxy), while the last layer was deformed to form a bulge. The pierced aluminum plate is characterized by petalling failure. Meanwhile, the aramid/epoxy was penetrated by the projectile with failure of the primary yarn to break the fiber.
EFFECT OF DRILLING PARAMETERS ON THRUST FORCE AND DELAMINATION DAMAGE OF DRILLED RAMIE WOVEN – COIR FIBER HYBRID COMPOSITES Chandrabakty, Sri; Fadly, Muhammad Syaiful; Nilasari, Sri
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1890

Abstract

This study examines the effect of spindle speed and feed rate variations on the delamination mechanism and thrust force of hybrid composite materials reinforced with ramie weave and coir fibers. The specimen was made with a volume fraction of 30%, consisting of 6 layers of woven ramie, with the remainder being coir. The drilling process is divided into four main phases, showing changes in thrust force at each stage. The results indicate that an increase in feed rate tends to increase thrust force and cause microstructural damage such as delamination and fiber pull-out. At a feed rate of 0.26 mm/rev and a spindle speed of 1500 RPM, the maximum thrust force is reached, indicating the most severe damage. The delamination factor is higher on the exit side compared to the entry side, especially at higher spindle speeds. Tensile tests show a significant decrease in the tensile strength of the composite material due to drilling, with the highest tensile stress achieved at a spindle speed of 1500 RPM and a feed rate of 0.1 mm/rev, although still lower than the sample without holes. The combination of high feed rate and high spindle speed increases the risk of material damage, but the proper selection of drilling parameters can help minimize damage and maintain the mechanical integrity of the composite material. This study provides important insights for industrial applications where mechanical strength and drilling efficiency are crucial.
Co-Authors Alfriansyah Alfriansyah Anindito Purnowidodo Bakri Bakri Khairil Anwar M Rusdi Mohammad Tahir Muhammad Iqbal Muhammad Sadat Hamzah Muhammad Syaiful Fadly Naharuddin Naharuddin Nilasari, Sri Putra, Kusuma Angga Putu Hadi Setyarini Wahyu Richard Nugraha