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All Journal Turbo : Jurnal Program Studi Teknik Mesin Eksergi: Jurnal Teknik Energi TEKNOSIA Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Hendri Hestiawan
Universitas Bengkulu
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Kaji sifat fisik biokomposit polylactic acid berpenguat serbuk cangkang kerang lokan Alqap, A. Sofwan F; Hestiawan, Hendri; Suandi, Agus; Zuliantoni, Zuliantoni; Farid, Muhammad
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2857

Abstract

This research aimed to investigate the effect of adding lokan clam shell powder on the physical properties of polylactic acid (PLA) biocomposites. The research materials consisted of lokan clam shells obtained from the fish auction place in Pulau Baai of Bengkulu City, PLA in filament form, and chloroform. Lokan clam shells were washed with clean water, dried for 12 hours and heated at 900oC for 6 hours. The powder obtained was filtered using a 100 mesh sieve. The PLA dissolution process used chloroform for 2 hours in a closed process with a ratio of 1 g PLA to 5 ml chloroform. After that, added lokan clam shell powder and stirred for 15 minutes using a hotplate at room temperature. The biocomposite manufacturing process used a molding technique with variations in the volume fraction of lokan clam shell powder of 10%, 30% and 50%. The physical properties test includes the density test using the ASTM standard of D1622 and the water absorption test using the ASTM standard of D 570. The results of the physical properties research show that the addition of 10% lokan shell powder to the PLA biocomposite is able to reduce the density and increase the maximum water absorption by 0 .89 g/cm3 and 5.91% respectively.
PENGARUH FRAKSI VOLUME DAN PEMBEBANAN TERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT BERPENGUAT SERBUK CANGKANG KERANG LOKAN Hestiawan, Hendri; FA, A. Sofwan; Amri, Khairul; Farid, Muhammad
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 1 (2024): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i1.3264

Abstract

The increasing consumption of local clam shells which contain high nutritional value in society has resulted in an increase in waste sea shells in areas around the coast of Bengkulu Province. The high calcium content in lokan clam shells attracts researchers to study the physical and mechanical properties of epoxy resin composites reinforced lokan clam shell powder. This research aims to investigate the effect of variations in the volume fraction of lokan clam shell powder and the mold loading on the physical and mechanical properties of composites reinforced lokan clam shell powder. The process of manufacturing shell powder is carried out by heating at a temperature of 900oC for 6 hours. Variations in the volume fraction of lokan clam shell powder consist of 30, 50, 70%. Meanwhile, the mold loading was varied by 0, 500 N, and 1 kN. The manufacturing process uses hand lay-up techniques. Physical and mechanical tests on composites include water absorption tests, density, tensile tests and impact tests. The results of the research show that the powder volume fraction and mold loading influence the physical and mechanical properties of composites reinforced lokan clam shell powder. The best physical properties of composite were obtained at a powder volume fraction of 70% and a mold loading of 1 kN, namely with a density of 1.43 g/cm3. The best mechanical properties of composite were obtained at a volume fraction of 30% and a mold loading of 1 kN, namely with a tensile strength of 33.2 MPa and an impact toughness of 366.8 kJ/m2.
PENGARUH SUSUNAN SERAT TERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT HYBRID BERPENGUAT SERAT AGEL/FIBERGLASS MENGGUNAKAN TEKNIK VACUUM INFUSION Hestiawan, Hendri; Zuliantoni; Saragih, Fernando Desfriandi
Teknosia Vol. 18 No. 2 (2024): Desember 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/teknosia.v18i2.35852

Abstract

This research was motivated by using agel fiber which is easy to obtain and the effect of agel fiber which is hybridized using glass fiber using the vacuum infusion technique. This research aims to determine the effect of fiber arrangement on the mechanical and physical properties of agel/ fiberglass reinforced hybrid composite using the vacuum infusion technique. The main materials used in this research are agel fiber, fiberglass, ripoxy vinyl ester resin, methyl ethyl ketone peroxide (MEKP) catalyst and EX promoter. The process of making a specimen begins with preparing a mold from acrylic, then arranging the fibers based on predetermined variations in the arrangement. Resin, catalyst and promoter are mixed in a ratio of 400:40:1. Then stir until evenly mixed, then pour it into a container that is connected to the mold, after that the vacuum infusion process is carried out until the fiber structure in the mold is completely covered. The finished specimen is formed based on the testing standards. Bending test bending test uses ASTM D-790 standard, impact test uses ASTM D-5941 standard, tensile test uses ASTM D-638 standard, and density testing uses ASTM D-792 standard. The results of this research show that the mechanical and physical testing of the Agel-Gelas-Gelas-Gelas-Gelas-Gelas-Agel arrangement has the best bending strength, impact toughness and highest tensile strength, producing values ​​of 236.69 MPa, 62.97 kJ/ m2 and 84.1 MPa, while for testing the best density was obtained in the Gelas-Agel-Agel-Agel-Agel-Agel-Gelas G-5A-G arrangement of 1.19 gr/cm3.
PENGARUH MATRIKS DAN KETEBALAN SKIN TERHADAP SIFAT MEKANIK KOMPOSIT SANDWICH DENGAN CORE POLYURETHANE Hestiawan, Hendri; Afrizal, Yuzuar; FA, A. Sofwan; Sitinjak, Heryanto; Fadilah, M. Hafidz
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3719

Abstract

Indonesia is an earthquake-prone country related to its geological position located in the Pacific ring of fire. Therefore, it is necessary to mitigate earthquake disasters so as not to cause much loss, both property and life. One of them is by introducing the walls of earthquake resistant composite house (RKTG) made from sandwich composites. The purpose of this study was to investigate the effect of matrix and skin thickness on the mechanical strength of sandwich composites with polyurethane cores.). Sandwich composites use variations of glassfiber reinforced polymer (GRP) and glassfiber reinforced concrete (GRC) skins and variations in skin thickness of 6 mm and 10 mm. The adhesive used is polyester resin with methyl ethyl ketone peroxide catalyst. The manufacturing process of making sandwich composites uses the hand lay-up technique with a sandwich composite thickness of 10 cm. The results showed that GRP skins have better mechanical properties than GRC skins. Skin thickness can also improve the mechanical properties of sandwich composites. The best mechanical strength was obtained in the GRP skin type with a skin thickness of 10 mm, namely a flexure strength of 1.63 MPa, a compressive strength of 10.7 MPa, and a tensile strength of 0.08 MPa.
HEAT TREATMENT EFFECT ON MECHANICAL PROPERTIES OF JIS SCM4 STEEL Hestiawan, Hendri; Zuliantoni, Zuliantoni; Febriyanto, Dwi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9858

Abstract

It is about steel JIS SCM4 of 0.39% C, 0.28% Si, 0.77% Mn, 0.95% Cr and 0.17% Mo composition. The steel was heated to improve the mechanical properties. The heat treatment was applied on  a cylindrical specimens of 20 mm diameter at 850 C for 30 minutes. The heated samples were then quenched into media of oil, coconut oil, kerosene, water and the other was annealed. The quenched specimens were tempered at 300 °C for 30 minutes. Testing of mechanical properties was tensile and hardness tests. The lower viscosity of the quenchant gave the tensile stress and hardness higher. The highest one  was about 1779 MPa and 52 HRC of specimens quenched to water and  the highest strain was achieved as high as to 21.76% of the annealed one. The microstructure of the  quench-temper was martensitic phase, and ferritic-pearlitic of the annealed.
PENGARUH PERLAKUAN ALKALI DAN SUSUNAN SERAT TERHADAP WATER ABSORPTION PADA KOMPOSIT HYBRID BERPENGUAT SERAT AGEL TENUN/SERAT GELAS/RESIN POLIESTER Hestiawan, Hendri; Jamasri, Jamasri; Kusmono, Kusmono
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9928

Abstract

The aim of this research is to investigate the effect of alkali treatments and stacking sequences on water absorption in hybrid composites of woven agel fiber/glass fiber/polyester resin. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standards. Water absorption test results show that alkali treatment with glass fiber arrangement on the surface effectively holds the entry of water into hybrid composites. This can be seen from the decrease in maximum water absorption (Mm) and diffusion coefficient of hybrid composite, which are 8,67% dan 5,74 x 10-12 m2/s respectively.The aim of this research is to investigate the effect of alkali treatments and stacking sequences on water absorption in hybrid composites of woven agel fiber/glass fiber/polyester resin. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standards. Water absorption test results show that alkali treatment with glass fiber arrangement on the surface effectively holds the entry of water into hybrid composites. This can be seen from the decrease in maximum water absorption (Mm) and diffusion coefficient of hybrid composite, which are 8,67% dan 5,74 x 10 -12  m2/s respectively
PENGARUH POST CURING TREATMENT DAN PERENDAMAN AIR LAUT PADA KOMPOSIT HYBRID KEVLAR/KARBON Suryono, Ahmad Fauzan; Faizal, Ahmad; Hestiawan, Hendri
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 1 (2020): April 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i1.13273

Abstract

In composite engineering, there are also known hybrid composite types which allow the presence of two or more reinforcing particles and are usually arranged by a straight type and a random type. In this research, hybrid composites are made from a combination of kevlar fiber and carbon twill fiber using the vacuum assisted resin infusion (VARI) method. This fiber will be made into a composite consisting of ten layers with a composition of six layers of kevlar fiber and 4 layers of carbon twill fibers. Vinylester resin is used as a matrix on the composite. The hybrid composite material was given post curing treatment and soaked by sea water. From the tensile test results obtained an average ultimate tensile strength (UTS) value of 314.38 MPa at post curing temperature of 100 °C, then the results of compressive test of the kevlar/carbon hybrid composite with ASTM D6641 obtained an average compress strength value of 87.76 MPa at 100 °C postcuring and the results of the kevlar + carbon-vinylester composite shear test with ASTM D5379 obtained an average shear strength value of 20.45 MPa at post curing room temperature.
PENGARUH PERENDAMAN DALAM LINGKUNGAN AIR LAUT TERHADAP SIFAT MEKANIK KOMPOSIT BERPENGUAT SERAT KEVLAR SEBAGAI BAHAN BAKU MATERIAL FLOAT PESAWAT AMPHIBI Supardi, Nurul Iman; Adiansyah, Zeta; Hestiawan, Hendri
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 2 (2020): Oktober 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i2.18393

Abstract

Kevlar fibers have several advantages compared to other synthetic fibers, such as high tensile strength and relatively low density because it is composed of hydrogen bonds. This study aims to compare the mechanical strength of Kevlar fiber reinforced composites before and after immersion in a seawater environment as raw material for amphibious aircraft float materials. The materials used in this research consist of kevlar fiber, vinylester resin and methyl ethyl ketone peroxide catalyst. Composites manufactured by the vacuum infusion technique. The fibers were arranged in a mold, then a vacuum process was carried out to attract the resin stream. Tensile and shear tests were carried out before and after immersing the composites in a sea water environment at room temperature for 264 hours. Tensile test specimens refer to the ASTM standard of D3039, while the shear test specimens refer to the ASTM standard of D5379. The tensile strength of the kevlar fiber reinforced composites before immersion is 421.2 MPa. After immersion in a seawater environment, the tensile strength of the composite decreased to 389.3 MPa or decreased by 7.5%. Meanwhile, the shear strength of Kevlar fiber reinforced composites after immersing in a sea water environment did not change significantly from 14.6 MPa to 14.46 MPa or a decrease of 1.6%.
PROSES PENGEBORAN LUBANG BUCKET EXCAVATOR MENGGUNAKAN MESIN LINE BORING DI PD. XYZ Hasibuan, Zulfahmi Matumona; Nuramal, Agus; Hestiawan, Hendri
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 1 (2021): April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i1.20152

Abstract

PD. XYZ that is located in Soeprapto Dalam, Bumi Ayu, Selebar District,  Bengkulu is engaged in the metal working, construction and workshop. To facilitate the process, a machine is needed to help speed up each process. Tools  machine are used to make human work easy. Drilling process is one of the machining process that the aim is to enlarge the diameter of the excavator bucket hole. The purpose of this study are determine drilling process of a bucket excavator and observe the result of drilling on a line drilling machine. The research used a drilling line TPX6113 type that the chisel is YG6. Drilling process is carried out with three feeding process, namely 4mm, 2mm and 2 mm that the feeding speeds are 20 rpm and 31.5 rpm. The result is the smoothest process drilling in the high speed
Failure Analysis of Axial Compressor Rotor Blade on Alshtom Gas Turbine with Capacity 20 MW at PLTGU Maulana Nasution, Ahmad Rizki; Hestiawan, Hendri; Suryono, Ahmad Fauzan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 2 (2021): Oktober 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i2.20172

Abstract

This was the work in one of the Gas-Steam Power Plant (PLTGU) in the Southern Sumatra. The compressors on the Alsthom gas turbine suffered damage to the rotor blade section causing it to stop operations. In this study discussed the analysis of the cause of damage to the axial compressor rotor blade with the aim of knowing the causative factors of damage, the mechanism of damage, the shape of the microstructure and the size of the grain. Observations are made by direct macro observations. After making observations, it continues with the analysis of observations. From the results of the analysis, it was concluded that the damage occurred was influenced by several factors, namely corrosion, service life and environmental conditions. If the damage is compared to the size of the grain then the part that is a lot of damage has a larger grain size compared to the slightly damaged part.
Co-Authors Adiansyah, Zeta Afrizal, Yuzuar Agus Nuramal Agus Suandi, Agus Ahmad Faizal Ahmad Fauzan Suryono Al Wajdi, Habib Hussein Alqap, A. Sofwan F Angky Puspawan Dwi Kurniawanto Edy Kristian F. Alqap, A. Sofwan FA, A. Sofwan Fadilah, M. Hafidz Febriyanto, Dwi Fikri, Miftahul Haidi, Junas Hasibuan, Zulfahmi Matumona Herry Purnomo Indrizal Jamasri . Khairul Amri Kusmono M. Daigo Gusnanda Makkulau, Andi Maulana Nasution, Ahmad Rizki Muhammad Farid Nurul Iman Supardi Ompusunggu, Ferdinand Lincoln Ramadhan, Fahri Saeful Rohman Samsurizal Samsurizal Saragih, Fernando Desfriandi Seto Roseno Sitinjak, Heryanto Ziansyah, Vendrio Zuliantoni, Zuliantoni