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All Journal Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin
N.H. Sari
Department of Physics, Faculty of Mathematics and Natural Sciences, Hasanuddin University Jl. Perintis Kemerdekaan Km 10, Makassar 90245, Indonesia
Aerospace Engineering Automotive Engineering Mechanical Engineering Physics

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Sifat tekan komposit sandwich dengan inti beton cellular diperkuat pin bambu sebagai bahan panel ringan Catur, A.D.; Sutanto, R.; Salman, S.; Sari, N.H.; Wijana, M.; Prijaya, M.T.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.591

Abstract

Cellular lightweight concrete as sandwich composite core has the advantage of its density, with the presence of foam which makes it lighter. However, the presence of foam reduces its strength. Reinforcement with bamboo pins was carried out to increase the compressive strength of the sandwich composite. Bamboo pins connecting the composite skin reinforce the cellular lightweight concrete at an angle of 900, 700,650 to the composite skin. With the addition of bamboo pins, it increases the compressive strength of the sandwich composite in both flat and edge directions.
Filamen printer 3D berbasis limbah PET (polyethylene terephthalate) dan kitosan cangkang udang Azami, I.; Kurniasih, P.; ., S.; Amantha, A.; Habiiburrahman, N.; Sari, N.H.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i1.759

Abstract

One alternative for processing PET (polyethylene terephthalate) plastic waste is to convert it into a basic material for making 3D printer filaments with the addition of shrimp shell chitosan. The addition of shrimp shell chitosan to the filament can increase its mechanical strength. The aim of this research is to determine the best formulation and effectiveness of the combination of PET plastic with chitosan as 3D printer filament on the mechanical properties and microstructure of the surface. Making 3D printer filament from a combination of PET and shrimp shell chitosan using a double screw extruder with varying ratios between PET and shrimp shell chitosan (99 : 1, 97.5 : 2.5 and 95 : 5) with temperature variations at 175° C (Hopper Zone ), 195°C, 225°C, 245°C (Die zone) using a screw rotation speed of 50 rpm, with the testing process including a tensile test, to determine the mechanical properties of the material by analysis using the SEM (Scanning Electron Microscope) test ) to identify the surface morphology and size of the filament material. The test results for composition 99:1 (sample 1) had the lowest tensile strength value of 35.79 MPa, breaking 0.10 mm with an elongation value of 0.32%. Composition 97.5:2.5 (sample 2) with a tensile strength value of 96.20 Mpa, longest breaking length of 0.13 mm and highest elongation value of 0.42%. Composition 95:5 (sample 3) only has the highest tensile value of 98.95 MPa, with a breaking length of 0.06 mm and the lowest elongation of 0.18%.
Studi eksperimental terhadap porositas dan hambat alir udara pada komposit penyerap suara Sari, N.H.; Fajrin, J.; Yudhyadi, I.G.N.K.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 1 (2018): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (987.506 KB) | DOI: 10.29303/dtm.v8i1.100

Abstract

In this paper, we present a comprehensive analytical and experimental investigation for the determination of the air flow resistivity and porosity of sound absorber composite. The ratio of the volume fraction of fiber and polyester resin is 15, 25, 35, 55 and 65 (%).The dimensions of the absorbent composite sample are 29 mm x 20 cm (diameter x thickness). Porosity and Air flow resistivity of composites have been investigated. The results showed that the porosity of the composites increased with increasing amount of fiber due to the interface between fiber and resinless dense. In contrast, the air flow resistivity values are lower with a denser resin and fiber interface.
Karakteristik tekan, bending dan morphology komposit mortar ringan diperkuat serat limbah tekstil Sari, N.H.; Suteja, S.; Catur, A.D.; Jaya, D.P.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.593

Abstract

The composites was made from a foam mortar matrix with Hydrolized protein reinforced textile waste fiber and the compressive strength, flexural strength and fracture morphology characteristics of the composite have been reported. This study investigated the effectiveness of adding textile fiber waste to lightweight mortar composites to improve the mechanical characteristics of the composites, reduce weight and minimize production costs of mortar composites. Mortar composites are fabricated by varying the volume fraction of textile waste fiber from 0 to 1.2% (of the composite density). The results revealed that the addition of textile waste fiber to the mortar composites decreased bending strength and bending modulus. The maximum compressive strength of the mortar composite was obtained at a volume fraction of 0.6% textile fiber waste (0.30167 MPa) and the lowest compressive strength of 0.149 MPa was owned by the mortar composite without textile fiber waste (composite BTA). This phenomenon caused by the fiber pull out, interface bond between textile waste fiber and matrix, as shown from the SEM photo. The addition of excess textile fiber waste from optimal conditions reduces mechanical performance due to increased voids in the mortar composite. However, this strategy helpful to reduce the weight of the concrete, reduce production costs and reduce textile waste.
Efek suhu sintering terhadap sifat kekerasan bahan campuran Al/Cu/Sic melalui proses metalurgi serbuk Triadi, A.A.A.; Yudhyadi, I.G.N.K.; Suartika, I.M.; Sari, N.H.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 9, No 2 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (427.568 KB) | DOI: 10.29303/dtm.v9i2.277

Abstract

This study aims to investigate the hardness properties of materials made of a mixture of aluminum, copper, and silicon carbide powders. The product has been made of mixtures aluminium (Al), copper (Cu) and silicon carbide (SiC) powders with a concentration of 80; 15; 5 (% wt), respectively. Manufacture of the specimens was conducted used powder metallurgy. The dimension of the specimens’ diameter of 25 mm and a thickness of 4 mm. The variation of the temperature sintering is 320, 420 and 520 oC for 40 minutes. The hardness properties have analyzed using the Brinell method. The results show that at the temperature range  320 - 420 oC, the hardness of the specimen increase to 15.2 BHN; it is due to the bond between metal powders is formed strong enough. Conversely, at 520 oC the hardness number is low because most of SiC is bound weakly to other powders. It can be concluded that the selection of temperature and sintering time and proper mixing greatly influence the hardness properties of materials yields of powder metallurgical.
Characterization of nanocellulose from banana stem fiber and its bionanocomposite as a thermal insulation material Syahrul, A.I.; Rosyidin, M.D.; Hidayat, S.; Khaerunisa, K.; Soraya, N.; Sari, N.H.; Syahrul, S.
Dinamika Teknik Mesin Vol 15, No 1 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i1.1009

Abstract

Nanocellulose has garnered significant attention due to its unique properties and potential in various applications, including thermal insulation. The abundant banana stems found in Lombok Island generate considerable waste that can be utilized as a raw material for nanocellulose. This research aims to characterization of nanocellulose derived from Kepok banana stems and its composites as thermal insulation in solar panels. Nanocellulose was produced using acid hydrolysis with sulfuric acid (H2SO4), and several treatments were carried out including Natrium hydroxide (NaOH), Sodium chlorite (NaClO2), Sulfuric acid (H­2SO4), The results show that nanocellulose from banana stems has a tensile strength of 13.374 MPa - 13.63 MPa. The addition of nanocellulose was found to increase the tensile strength of the composite reaching 13.374 up to 13.63 MPa, thermal conductivity 0,1692 up to 0,1940 W/mK and is quite heat resistant at a temperature of 200 °C. SEM photos of nanocellulose show surface roughness and produce interface strength between banana stem fiber nanocellulose and polyester resin. With solid bonding, good tensile strength, conductivity and thermal stability, bionancomposites from banana stem can be used as thermal insulator (backsheet) materials for solar panels.
Sifat tekan komposit sandwich dengan inti beton cellular diperkuat pin bambu sebagai bahan panel ringan Catur, A.D.; Sutanto, R.; Salman, S.; Sari, N.H.; Wijana, M.; Prijaya, M.T.
Dinamika Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.591

Abstract

Cellular lightweight concrete as sandwich composite core has the advantage of its density, with the presence of foam which makes it lighter. However, the presence of foam reduces its strength. Reinforcement with bamboo pins was carried out to increase the compressive strength of the sandwich composite. Bamboo pins connecting the composite skin reinforce the cellular lightweight concrete at an angle of 900, 700,650 to the composite skin. With the addition of bamboo pins, it increases the compressive strength of the sandwich composite in both flat and edge directions.
Filamen printer 3D berbasis limbah PET (polyethylene terephthalate) dan kitosan cangkang udang Azami, I.; Kurniasih, P.; ., S.; Amantha, A.; Habiiburrahman, N.; Sari, N.H.
Dinamika Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i1.759

Abstract

One alternative for processing PET (polyethylene terephthalate) plastic waste is to convert it into a basic material for making 3D printer filaments with the addition of shrimp shell chitosan. The addition of shrimp shell chitosan to the filament can increase its mechanical strength. The aim of this research is to determine the best formulation and effectiveness of the combination of PET plastic with chitosan as 3D printer filament on the mechanical properties and microstructure of the surface. Making 3D printer filament from a combination of PET and shrimp shell chitosan using a double screw extruder with varying ratios between PET and shrimp shell chitosan (99 : 1, 97.5 : 2.5 and 95 : 5) with temperature variations at 175° C (Hopper Zone ), 195°C, 225°C, 245°C (Die zone) using a screw rotation speed of 50 rpm, with the testing process including a tensile test, to determine the mechanical properties of the material by analysis using the SEM (Scanning Electron Microscope) test ) to identify the surface morphology and size of the filament material. The test results for composition 99:1 (sample 1) had the lowest tensile strength value of 35.79 MPa, breaking 0.10 mm with an elongation value of 0.32%. Composition 97.5:2.5 (sample 2) with a tensile strength value of 96.20 Mpa, longest breaking length of 0.13 mm and highest elongation value of 0.42%. Composition 95:5 (sample 3) only has the highest tensile value of 98.95 MPa, with a breaking length of 0.06 mm and the lowest elongation of 0.18%.
Characterization of nanocellulose from banana stem fiber and its bionanocomposite as a thermal insulation material Syahrul, A.I.; Rosyidin, M.D.; Hidayat, S.; Khaerunisa, K.; Soraya, N.; Sari, N.H.; Syahrul, S.
Dinamika Teknik Mesin Vol 15, No 1 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i1.1009

Abstract

Nanocellulose has garnered significant attention due to its unique properties and potential in various applications, including thermal insulation. The abundant banana stems found in Lombok Island generate considerable waste that can be utilized as a raw material for nanocellulose. This research aims to characterization of nanocellulose derived from Kepok banana stems and its composites as thermal insulation in solar panels. Nanocellulose was produced using acid hydrolysis with sulfuric acid (H2SO4), and several treatments were carried out including Natrium hydroxide (NaOH), Sodium chlorite (NaClO2), Sulfuric acid (H­2SO4), The results show that nanocellulose from banana stems has a tensile strength of 13.374 MPa - 13.63 MPa. The addition of nanocellulose was found to increase the tensile strength of the composite reaching 13.374 up to 13.63 MPa, thermal conductivity 0,1692 up to 0,1940 W/mK and is quite heat resistant at a temperature of 200 °C. SEM photos of nanocellulose show surface roughness and produce interface strength between banana stem fiber nanocellulose and polyester resin. With solid bonding, good tensile strength, conductivity and thermal stability, bionancomposites from banana stem can be used as thermal insulator (backsheet) materials for solar panels.
Karakteristik tekan, bending dan morphology komposit mortar ringan diperkuat serat limbah tekstil Sari, N.H.; Suteja, S.; Catur, A.D.; Jaya, D.P.
Dinamika Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.593

Abstract

The composites was made from a foam mortar matrix with Hydrolized protein reinforced textile waste fiber and the compressive strength, flexural strength and fracture morphology characteristics of the composite have been reported. This study investigated the effectiveness of adding textile fiber waste to lightweight mortar composites to improve the mechanical characteristics of the composites, reduce weight and minimize production costs of mortar composites. Mortar composites are fabricated by varying the volume fraction of textile waste fiber from 0 to 1.2% (of the composite density). The results revealed that the addition of textile waste fiber to the mortar composites decreased bending strength and bending modulus. The maximum compressive strength of the mortar composite was obtained at a volume fraction of 0.6% textile fiber waste (0.30167 MPa) and the lowest compressive strength of 0.149 MPa was owned by the mortar composite without textile fiber waste (composite BTA). This phenomenon caused by the fiber pull out, interface bond between textile waste fiber and matrix, as shown from the SEM photo. The addition of excess textile fiber waste from optimal conditions reduces mechanical performance due to increased voids in the mortar composite. However, this strategy helpful to reduce the weight of the concrete, reduce production costs and reduce textile waste.
Co-Authors ., S. A.A.A. Triadi, A.A.A. Amantha, A. Azami, I. Catur, A.D. Fajrin, J. Habiiburrahman, N. Jaya, D.P. Khaerunisa, K. Kurniasih, P. M. Wijana, M. Prijaya, M.T. Rosyidin, M.D. S. Hidayat, S. S. Salman, S. S. Syahrul, S. Soraya, N. Suartika, I.M. Sutanto, R. Suteja, S. Syahrul, A.I. Yudhyadi, I.G.N.K.