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All Journal Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Piston: Jurnal Teknologi JUVOTEK JURNAL: Jurnal Vokasi Teknik
Herry Darmadi
Politeknik Teknologi Kimia Industri Medan
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Physics

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PENGARUH TEMPERATUR UAP TERHADAP EKSPANSI VOLUME DAN TEGANGAN TERMAL RODA LORI DISTASIUN PEREBUSAN PT. X Herry Darmadi; Jery Manaor Simarmata; Sorta Lumbantoruan; Nurlianna Tarigan; Dian Kurnia; Novia Nelza
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 12, No 1 (2026): April
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v12i1.15083

Abstract

Lorry wheels at the boiling station of a Palm Oil Mill (PKS) are exposed to high-temperature saturated steam during the boiling process, which causes volume expansion and thermal stress in the wheel material. This study aims to analyze the effect of steam temperature on volume expansion and thermal stress on lorry wheels in the palm oil mill sterilization station. Data were obtained through direct observation and theoretical calculations using ASTM A36 steel material parameters. The results show that an increase in steam temperature from 110.27°C to 133.59°C causes volume expansion of up to 1.39 × 10⁻⁵ m³ and thermal stress of up to 241.41 MPa, approaching the material's yield strength (250 MPa). It is concluded that steam temperature significantly affects deformation and potential failure of lorry wheel material.
Pengujian Mekanik (Kekerasan dan Impact) Logam Ferro Valve Plat Double Dampers yang Digunakan Sebagai Penyaring Abu Boiler Herry Darmadi; Arie Erza Erlangga Zebua; Nurul Shadrina Bintang; Agustin Nurya Savitri; Sorta Lumbantoruan
Piston: Jurnal Teknologi Vol 11 No 1 (2026): Juni 2026
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v11i1.134

Abstract

Double damper also known as a double flap damper, is a special control device used in the ash transfer system of a boiler before it enters the multi-cyclone. Mechanical testing (hardness and impact) is the most effective test for obtaining an overview of the mechanical properties of a material. Although hardness testing is only performed at a single point, or a specific area, the hardness value is quite valid in indicating the strength of a material. By conducting a hardness test, a material is easily classified as ductile or brittle. Impact testing is a test that uses rapid loading. In mechanical testing, there are differences in the type of load given to the material. Tensile testing, compression testing, and torsion testing are tests that use static loads. Meanwhile, impact testing uses dynamic loads. In rapid loading, also known as impact loading, a large energy absorption process occurs from the kinetic energy of a load that impacts the specimen. This energy absorption process will be converted into various responses in the material such as plastic deformation, isterisis effects, friction, and inertia effects. The purpose of this study is to determine the hardness value of the Double Dampers Valve Plate and to determine the strength of the Double Dampers Valve Plate through the impact test method. The test results obtained the hardness value of test material 1 (0°C) = 111.3 HRC, test material 2 (25°C) = 108.033 HRC, and test material 3 (100°C) = 103.9 HRC. In the impact test, the results of the impact strength analysis of test material 1 (0oC) = 0.215 Kg.m/mm2, test material 2 (25°C) =0.235 Kg.m/mm2, and test material 3 (100°C)= 0.255 Kg.m/mm2.
ANALISA PENGUJIAN MEKANIK TERHADAP VARIASI PENGGUNAAN BENTONITE DALAM PENGECORAN PINTU RUANG BAKAR: STUDI EKSPERIMEN DI PT. XYZ Herry Darmadi; Muhammad Fatih Abdillah; Agustin Nurya Savitri; Karti Karti; Dian Kurnia; Murhaban Murhaban
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 11, No 2 (2025): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v11i2.13836

Abstract

The Combustion chamber door is a component of the boiler that functions to open and close the combustion chamber. At PT. XYZ, the combustion chamber door is made through the melting and metal casting method. In the metal casting method using a sand mold, an auxiliary substance in the form of bentonite is needed which functions to glue the sand mold and strengthen the mold so that it is not easily destroyed when receiving heat from the molten metal lava. The bentonite variations used in this study are 8%, 10%, and 12%. Mechanical testing (impact and hardness) is the most effective test to determine the description of the mechanical properties of a material. The purpose of this study is to determine the magnitude of the impact strength of the metal casting results in the manufacture of combustion chamber doors with different bentonite variations impact testing with the Charpy Impact Test method and the hardness value of the metal casting results in the manufacture of combustion chamber doors with different bentonite variations through hardness testing with the Rockwell Hardness Test method. In the impact test, the results of the impact strength analysis of the 8% bentonite variation were 0.1655 Kg.m/mm2, the 10% bentonite variation was 0.2119 Kg.m/mm2, and the 12% bentonite variation was 0.2555 Kg.m/mm2. In the hardness test, the results of the hardness analysis on the 8% bentonite variation were 104,7 HRC, the 10% bentonite variation was 92,1 HRC, and the 12% bentonite variation was 81,8 HRC.
Besarnya Bending Stress Pada Roda Gigi Lurus Akibat Tekanan Sepasang Roda Gigi Di Bunch Crusher PT Abc Gio Fadli Situmorang; Herry Darmadi; Nurul Shadrina Bintang
JURNAL VOKASI TEKNIK Vol 3 No 03 (2025): November Issue | JUVOTEK JURNAL
Publisher : MEDAN TEKNO SOLUSI

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The object of the research observed is the magnitude of the bending stress on the straight gear that causes pressure on a pair of gears in the bundle crusher. Bunch crusher is a tool that functions to thresh the bunches left in the empty bunches by pressing the bunches between two rollers that rotate in opposite directions. At the end of the roller is a shaft and is installed two straight gears that are connected to each other and when the two straight gears are connected to each other, rotating, the gears experience bending stress. Bending stress is the stress that occurs due to the bending moment. The bending moment occurs because it is influenced by the moment arm that is formed. The study aims to determine the magnitude of the bending stress on the gears in the bundle crusher due to the pressure of a pair of gears. From the results of the study, it was concluded that the magnitude of the bending stress on the upper gear of the bunch crusher when separating the bunches from the bunches of boiled fruit is 8.8 kg/cm2. and the magnitude of the bending moment that occurs on the upper gear of the bundle crusher is 65.934 kg.cm.
Co-Authors Agustin Nurya Savitri Arie Erza Erlangga Zebua Dian Kurnia Gio Fadli Situmorang Jery Manaor Simarmata Karti Karti Muhammad Fatih Abdillah Murhaban Novia Nelza Nurlianna Tarigan Nurul Shadrina Bintang Sorta Lumbantoruan