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Analisa Kemampuan Meredam Suara Pada Batu Bata Komposit Berbahan Dasar Semen, Pasir, Faba (Fly Ash Bottom Ash) Riko Wahyuddin Kosar; Muhammad Hasbi; Aminur Aminur
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 3, No 4 (2018): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

Noise is one of urban people everyday life challenge as many world societies have to encounter. Thus noise reduction material is highly required.This research aims to contain the suitable mixture of composite brick made of faba, cement, and sand for noise reduction furthermore this research also aim to understand and analyze composite brick made of faba (fly ash and bottom ash)in noise reduction towards frequency of 1200 Hz, 1300 Hz, 1400 Hz, 1500 Hz and 1600 Hz. This experiment developed through three variants of different composition which used faba, cement, and sand material. The experiment result exhibit that in the material of volume fraction 10:30:60% on specimen 1 obtained the highest coefficient value of absorptive sound 0.34104 dB with frequency of 1600 Hz and the lowest coefficient value of absorptive sound 0.14721 dB in volume fraction 20:30:50% with frequency of 1200 Hz, on specimen 5. The higher of absorptive sound coefficient value impacted to the more excellent quality of noise reduction material. Keywords: Cement, sand, faba, noise absorption coefficient.

Pengaruh Penambahan Fly Ash dan Serbuk Kaca Terhadap Sifat Fisik dan Mekanik Komposit Batako La Ode Husain; Nanang Endriatno; Aminur Aminur
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 5, No 4 (2020): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

Composite is a new material engineered by two or more materials where the properties of the materials differ from one another both in chemical and physical properties. Composites are obtained from a combination of metal with ceramics, metal with plastics, and others. The purpose of this study was to determine the effect of adding fly ash and glass powder on the physical and mechanical properties of brick-based composites. The drying process is carried out for 28 days. The compressive strength and water absorption tests were carried out after the drying process. The results showed the highest compressive strength value is on the B sample is 74.17 kg / cm2 and water uptake is lowest in the sample A, namely 10.53%. The highest compressive strength test results exist in the sample B is 74.17 kg / cm2 and the compressive strength is lowest in the sample A which is 66.67 kg / cm2. While the highest water absorption test results were in sample C, namely 15.05% and the lowest water absorption value was in sample A, namely 10.53%. Keywords: Brick-Based, fly ash, glass powder, compressive strength, water absorption.

STUDI SIFAT MEKANIK KOMPOSIT POLIMER YANG DIPERKUAT PARTIKEL CLAY Muhammad Hasbi; Aminur Aminur; Sahril Sahril
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1, No 1 (2016): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

Komposit dihasilkan dari pencampuran dalam sejumlah fase yang terdiri dari 2 bagian utama yaitu matriks (sebagai pelindung filler) dan filler (sebagai penguat dari matriks). Material komposit polyester yang diperkuat partikel clay telah dikembangkan dalam penggunaan dibidang kontruksi seperti genteng. Tujuan dalam penelitian ini adalah untuk mengetahui pengaruh komposisi dan putaran pengaduk clay dan resin polyester terhadap kekerasan dan tegangan bending untuk aplikasi genteng. Penelitian ini dilakukan di Laboratorium Material dan Teknologi Mekanik Jurusan Teknik Mesin Fakultas Teknik Universitas Halu Oleo. Bahan yang digunakan adalah clay sebagai partikel dan resin polyester sebagai penguat. Dalam penelitian ini komposisi resin polyester dan clay yang digunakan adalah 95:5%, 90:10% dan 85:15% sedangkan untuk putaran yang gunakan yaitu 762 Rpm, 944 Rpm dan 1066 Rpm. Pengujian spesimen dibuat berdasarkan standar ASTM pengujian kekerasan dan tegangan bending. Hasil pengujian menujukan bahwa, nilai kekerasan maksimum komposit terdapat pada komposisi 5% clay dengan kecepatan putar 1066 Rpm. Sedangkan untuk nilai tegangan bending maksimum terdapat pada komposit komposisi 5% clay dengan kecepatan putar 1066 Rpm. Kata kunci : Clay, Polyester, Komposit, Kekerasan dan Bending.

Analisa Pengaruh Kuat Arus Terhadap Kekuatan Tarik Dan Bending Sambungan Las Kampuh V Menggunakan Las SMAW Dengan Elektroda E6013 Pada Pengelasan Baja Karbon Rendah Ridwan Ridwan; Abd. Kadir; Aminur Aminur
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 6, No 2 (2021): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

Strong current in welding is something that has always been a problem in the welding process. High currents can cause penetration of the welded material, whereas low currents can cause shallow penetration. The purpose of the study was to determine the effect of current on the tensile and bending strength of V seam welded joints using SMAW welding with E6013 electrodes on low carbon steel welding. The research method used is to make a seam on a steel plate with an angle of 60 degrees and then weld it with a different current. The current used is 70, 90, 110 amperes with an electrode diameter of 2.6 mm. The samples that have been welded are then formed into tensile and bending test specimens. The results showed that the highest average tensile stress was 518.310 MPa at a welding current of 110 amperes. The highest average tensile strain is 34.00% at a welding current of 70 amperes. The highest average elastic modulus is 0.01864 GPa at a welding current of 110 amperes. For bending testing at 70 amperes, the fb1 specimen has cracks in the weld metal area with a crack length of 1.00 mm and the fb2 specimen has 0.50 mm cracks, while the 90 amperes fb1 specimen has 1.00 mm cracks, and fb2 specimens have 0.50mm crack. Current 110 amperes fb1 specimen has a crack of 4.70 mm, and fb2 specimen has a crack of 3.00 mm. From the results of the study, a good welding current for a plate with a thickness of 7.5 mm with an E6013 electrode with a diameter of 2.6 mm is at a current of 90 amperes.

ANALISA MAMPU REDAM KOMPOSIT POLYESTER DIPERKUAT SERAT BATANG PISANG Jenny Delly; Aminur Aminur; Loman Leo
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1, No 1 (2016): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

ABSTRAKPolusi suara yang berasal dari kebisingan merupakan permasalahan klasik yang ada diIndonesia. Kebisingan inidapat dikurangi dengan menggunakan peredam akustik. Bahan komposit berbahan dasar matriks serat batang pisang merupakan sebuah alternatif material peredam akustik yang ramah lingkungan karena memanfaatkanmaterial limbah pertanian. Penelitian ini bertujuan menganalisa mampu redam komposit polyester diperkuatserat batang pisang. Metode penelitian dilakukan dengan pengambilan serat batang pisang, pembuatan kompositdan pengujian sifat penyerapan bunyi komposit polyester serat batang pisang. Pengambilan serat batang melaluiproses penguraian dengan larutan 5% NaOH selama 14 jam dan dijemur sampai kering, kemudian dicincangdengan blender. Serat yang didapatkan kemudian dibuat komposit dengan fraksi volume serat 30, 40, dan 50%.Setiap fraksi volume serat pada komposit dicetak tekan sampai mengeras dengan waktu ±5 jam. Pada fraksiyang sama dibuat sampel sebanyak 9 spesimen uji. Pengujian redaman komposit dilakukan pada alat KundtsTube Impedance yang dilengkapi perangkat speaker, amplifier, power supply, laptop, osiloscope, sound levelmeter, dengan frekuensi input 200, 400, dan 600 Hz. Hasil penelitian redaman komposit polyester diperkuat serat batang pisang memiliki koefisien serap suara tertinggi 0,72 pada fraksi volume serat 50% dengan frekuensi input 200 Hz dan nilai terendah 0,54 pada fraksi volume serat 30% dengan frekuensi input 400 Hz. Secara keseluruhan spesimen dapat dijadikan sebagai bahan peredam karena memiliki nilai koofisien serap suara > 0,30.Kata Kunci : komposit, resin polyester, serat batang pisang dan NAC.

PENGARUH ARTIFICIAL AGING DAN NATURAL AGING TERHADAP KEKERASAN DAN STRUKTUR MIKRO PENGECORAN LOGAM PISTON Al-Si Edriyanto Edriyanto; Ridway Balaka; Aminur Aminur
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 2, No 4 (2017): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

The purpose of this research is to know the effect of artificial aging and natural aging on increasing hardness and micro structure of Al-Si alloy recycling. The material used in this research is Al-Si alloy which comes from motorcycle piston scrap which is casted like piston (prototype). The casting method used is acasting wherein a liquid metal is poured into a mold without pressure. Piston scrap is melted with 700????C temperature, on induction furnace for 1 hour and poured into die casting. Product of castings of prototype motorbike piston are prepared to be specimen followed by artificial aging and natural aging process with holding time 1-3 hour to test micro structure and hardness test of vickers method.Vickers hardness test results show that the maximum hardness value of aritifiacial aging specimens is 132,16 Kg / mm² with 3 hours hold time, and the lowest hardness value is 110,31 Kg / mm² with 1 hour hold time. While for themaximum hardness value of natural aging samples is 101,57 Kg / mm² with 3 hour hold time, while the lowest hardness value is obtained equal to 82,53 Kg / mm². With result of observation of micro structure of each sample undergoes structure change.Keywords: Metal casting, natural aging, artificial aging, hardness, and micro struktur.

Studi Kecepatan Spindel Mesin Bubut Terhadap Nilai Unit Horse Power (UHP) Pada Proses Pembubutan Baja Karbon Rendah Fahri Ari Saputra; Samhuddin Samhuddin; Aminur Aminur
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 6, No 3 (2021): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

The machining process is a manufacturing process where the main process is removing or removing some of the material from a basic material which can be in the form of a shaft so that it meets the desired shape and quality. The purpose of this study was to determine the effect of the rotational speed of the lathe spindle on the value of Unit Horse Power (UHP) in the low carbon steel turning process. The study used carbon steel material in the form of a cylinder with an initial diameter of 40 mm and a length of 150 mm. The cylindrical workpiece is turned with a depth of 1 mm at various speeds, namely 95 rpm, 130 rpm and 180 rpm. The results showed that the rotational speed of the lathe spindle affects the value of the unit horse power (UHP). The higher the spindle rotation of the lathe, the greater the UHP obtained, where the highest UHP occurs at 180 rpm with a UHP value of 0.00030 and the lowest UHP. found in round 130 with a UHP value of 0.00016. High rotation causes a large force so that the vibration of the lathe tool is even greater.Keywords: Lathe process, carbon steel, spindle rotation.

Uji Pembakaran Biobriket Tongkol Jagung dan Sekam Padi Menggunakan Perekat Sagu Dedi Mardeni Suratin; La Ode Ahmad Barata; Aminur Aminur
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 7, No 3 (2022): Enthalpy: Jurnal Ilmiah Mahasiswa Teknik Mesin
Publisher : Teknik Mesin Universitas Halu Oleo

The main source of energy for humans is Human Resources which comes from carbon fossils. This energy has been deficient so it needs to be energy differentified. Biobriquettes are charcoal bars using soft materials that are processed into hard charcoal materials. The purpose of this study was to determine the composition of a good mixture (not easily destroyed) based on the compressive strength of the Corn Cob and Rice Husk biobrikets and to determine the flame temperature of the Corn Cob biobriket and Rice Husk. The method carried out in this study is the analysis of the flame temperature and compressive strength contained in the briquettes. The analysis carried out in this study was carried out with 5 variations in composition, namely ( corn cobs 25% : rice husks 75% : sago 15%, corn cobs 75% : rice husks 25% : sago 15%, corn cobs 50% : rice husks 50% : sago 15%, corn cobs 100% : rice husks 0% : sago 15%, and corn cobs 0% : rice husks 100% : sago 15%). From the results that have been obtained, briquettes that have good quality are found in corn cobs 25%: Rice husks 75%: sago 15% with a temperature value of 500 °C and a maximum load strength value of 159,060 with a compressive strength value of 1.0404624 N / mm2.Keywords: Corn cobs, rice husks, and flame temperature

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