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M Dalil
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Engineering

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Studi Karakteristik Mekanik Dan Struktur Mikro Coran Aluminium Minuman Kaleng Latif Kuncoro Wasmi Apris; Dedy Masnur; M Dalil
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Scrap aluminum cans recycle processing through metal casting is a way to improve the economic value. Yet, this process could not instantly be carried out to produce parts without knowing the chararacteristics of mechanical and microstructure. This study investigates those characteristics in three different pour temperatures, 650°C, 700°C, and 750°C respectively and three die temperatures, 100°C, 200°C, and 300°C. The result showed that the hardness number of aluminum cast was decreased as well as increasing of pours and die temperatures. The highest hardness number was 67.615 VHN at 650°C pour temperature, but the lowest one was 58.327 VHN at 750°C pour temperature. The highest hardness number was 77.871 VHN at 100°C die temperature, but the lowest was 61.479 VHN at 300°C die temperature. Tensile strength values were increased at a pour temperature of 650°C to 700°C and decreased at pour temperature of 750°C. The highest tensile strength was 174.183 MPa at 700°C pour temperature and the lowest tensile strength was 110.900 MPa at 750°C pour temperature. The tensile strength was decreased as well as increasing of die temperature. The highest tensile strength was 177.473 MPa at 100°C die temperature and the lowest tensile strength was 108.317 MPa at 300°C die temperature. The microstructure results showed that at650°C pour temperature and 100°C die temperature with more thick flake lines (Mg) than thin flake lines (Mg). The 700°C pour temperature and 200°C die temperature had with more dominant thick flake lines (Mg) than thin flake lines (Mg). The 750°C pour temperature and 300°C die temperature had with more dominant thin flake lines (Mg) than thick flake lines (Mg).Keywords: Hardness, Tensile Strength, pour temperatures, die temperatures, microstructure
Pengaruh Pembengkokan Terhadap Kekuatan Baja Sruktur Tulangan Beton Di Lingkungan Air Gambut Kana Sabatul Ikhwan; M Dalil
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Concrete reinforcement steel bar when it began ordering from manufacturers and further functionalized into the building structure experience bending process to ease the transportation activity or while loading and unloading is not willful bent. Environmental conditions also affect the physical and mechanical condition of the reinforcement steel bar. From the many environmental conditions of corrosion, the selected scope is the peat water as a characteristic geographical conditions in Riau Province. The research methodology is testing experimentally. Concrete reinforcement steel bar is bent on angle (α) 20o, 40o, 60o, 80o, 100o, 120o, 140o, 160o, and 180o. There are two groupings of each bending specimens, they are soaked in the peat water and not soaked in the peat water. Then the specimens is straightened for tensile testing. The average tensile strength and ductility of reinforcing steel bar increase varies depending on the bending angle when compared to normal reinforcement steel bar. The percentage of elongation decreased due to the bending depends of bending angle. Meanwhile, due to bending and soaked in the peat water, the tensile strength was increased but not exceeding the sample group were not soaked and the value of elongation decreased lower than the reinforcing steel bar that is not soaked.Keywords: Bending, Steel bar, Peat Water, Strength
Co-Authors Dedy Masnur, Dedy Kana Sabatul Ikhwan Latif Kuncoro Wasmi Apris