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All Journal INOVTEK POLBENG Jurnal Teknik Mesin JURNAL CRANKSHAFT Jurnal Abdi: Media Pengabdian Kepada Masyarakat Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) METAL : Jurnal Sistem Mekanik dan Termal Cylinder : Jurnal Ilmiah Teknik Mesin
Ismet Hari Mulyadi
Mechanical Engineering Department, Faculty Of Engineering, University Of Andalas, West Sumatera, Indonesia
Aerospace Engineering Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Pengaruh Penambahan Filler Al2O3 dan TiO2 pada Resin Polyester terhadap Sifat Fisik dan Mekanik Ahmad Hasnul Fajri; Ilhamdi Ilhamdi; Ismet Hari Mulyadi; Jon Affi
Jurnal Teknik Mesin Vol 16 No 2 (2023): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.16.2.1187

Abstract

Polyester composites have been developed to have high strength and light density, but the fracture occurs due to very little plastic deformation or low strain values, pre-failure detection is difficult in these composites due to the rapid propagation of cracks in the composite system. To increase the strength and delay failure, the addition of filler in the form of Al2O3 and TiO2 particles is carried out. The use of particles as fillers in polymer composite materials is increasingly being developed. In this study, Al2O3 and TiO2 particles (0%, 2%, 4%, 6%, 8%, 10% vol.) were added in polyester matrix BQIN EX 157. by casting method; the liquid homogeneous mixture was carefully poured into a simple mould to be air dried. The composites were cut to serve as specimens for density test, mechanical tests such as tensile and compressive tests. The results showed a density of 1.23 g/cm3, a maximum strength of 47 MPa for 2% additional Al2O3 filler, (tensile, decreasing ̴11%) and 120 MPa (compressive) for a maximum of 2% additional Al2O3 (compressive, decreasing ̴3%) with TiO2 filler. The decrease in strength was caused by uneven particle dispersion, voids and agglomeration that occurred during the casting process.
Design Improvement of A Prototype Energy-Efficient Vehicle Body Putra, Haznam; Mulyadi, Ismet Hari
JURNAL CRANKSHAFT Vol 7, No 4 (2024): Jurnal Crankshaft Vol.7 No.4 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v7i4.13947

Abstract

In order to achieve an energy-efficient vehicle, many aspects had to be considered, including the weight of the vehicle's body. The weight of the vehicle's body depends on its design and materials. As part of the energy-efficient initiatives, the design of the energy-efficient car developed by a Mechanical Engineering Team of Universitas Andalas needs to be redefined to improve its performance due to its active participation in national competition. Autodesk Inventor software's capability supported a reverse engineering strategy to enhance the car body design. Meanwhile, the appropriate car body material was selected using the Analytic Hierarchy Process (AHP). Furthermore, the improved car body design was evaluated using an academic version of ANSYS R1 and Fluent software. A weight reduction of 8 Kg is gained due to improving the new car body design and with the achievable thickness of 3.4 mm. Accordingly, it could minimize the Coefficient Drag (CD) of the new car body design to 0.066275. This result indicates a further improvement of the new energy-efficient car body design that would accelerate the car's performance and gain better results in the next national energy-efficient vehicle competition.
Perkembangan Kualitas Lubang Komposit Serat Daun Nanas dengan Menggurdi Bertahap Kecepatan Tinggi Mahdi, Whiko Androser; Mulyadi, Ismet Hari
Jurnal Teknik Mesin Vol 17 No 2 (2024): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.17.2.1604

Abstract

Composites are materials consisting of reinforcement and matrix. Reinforcing materials of composites consist of synthetic materials and natural fiber materials. One of the natural fibers that is currently being developed is pineapple leaf fiber, where several studies have found several ways to process pineapple leaf fiber so that it can be used as a substitute for synthetic fibers. One of the studies is looking for good machining parameters to process pineapple leaf fiber with a peck drilling canned cycle process which in this research objectives to see how the development of hole quality in the peck drilling canned cycle process. The stage in this research starts from the material being drilled with the stepwise dredging method, after the dredging process the holes are viewed using a digital microscope and then measured using Digimizer image processing software. The results of this study are roundness deviation, cylindricity deviation, axis perpendicularity deviation, and delamination ratio. The results obtained from this study will be subjected to statistical tests in order to obtain tested values using the ANOVA statistical test with the approach used, namely the fisher individual test in order to see the real impact of the machining process carried out.
Analysis of Cut Size Paper Cutting Machine Performance Using Total Productive Maintenance Concept (Case Study: PT. RST) Mustafa, Rolandi; Susilawati, Anita; Mulyadi, Ismet Hari
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 68 No 2 (2024): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v68i2.365

Abstract

PT. RST, a leading paper factory in Indonesia, prioritizes timely production by optimizing productivity, efficiency, and paper quality. This study assesses the reliability of the Cut Size (CS) paper cutting machine, which is enhanced through the implementation of Total Productive Maintenance (TPM) as a management philosophy to ensure high-efficiency operations. To evaluate machine performance, Overall Equipment Effectiveness (OEE) measurement is used. From data collected from January to September 2023, an analysis is conducted to improve the performance of the CS machine, which has not met its set target. The average OEE value of 70.9% falls short of the target of 72%. This research aims to improve the performance of the CS machine through the TPM approach, focusing on the Focused Maintenance pillar. Using tools such as Pareto diagram, why-why analysis, fishbone diagram, and the 5W1H method, several sources of problems causing the decrease in OEE value will be identified and addressed.
Percentage Area Reduction of Uncut Fibre of Drilling Pineapple Leaf Fibres Reinforced Composites with Peck Drilling Canned Cycle Method Mulyadi, Ismet Hari; Rusdi, M.F.R.; Kurniawati, Loli; Ma'sum, Arif
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 68 No 1 (2024): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v68i1.361

Abstract

The effectiveness of utilizing the peck drilling canned cycle to minimize hole delamination has been demonstrated. However, its potential to reduce uncut fiber resulting from fiber fracture and pull-out has not been fully recognized, particularly in drilling natural fiber-reinforced polymer composites. Therefore, this study investigated the performance of this established method and compared it with the conventional drilling approach using a stepped geometry drill bit, which is purported to minimize hole delamination and, consequently, reduce uncut fiber. A series of hole-making processes were carried out according to a Completely Randomized Design (CRD) experimental plan. Different feed movements were employed to elicit responses, specifically the extent of uncut fiber area. The findings indicate that employing the established method could reduce uncut fibers by approximately 18.6%, representing a 2% enhancement compared to the alternative approach. Hence, the peck drilling canned cycle strategy offers a promising and cost-effective alternative to using specialized drill bits or high-performance cutting tools.
Co-Authors Adjar Pratoto, Adjar Agus Sutanto Ahmad Hasnul Fajri Anita Susilawati Bambang Dwi Haripriadi Farchan - Vernando Haznam Putra Ilhamdi Ilhamdi Irwan Kurniawan Jon Affi, Jon Jupri Kurniawati, Loli Ma'sum, Arif Mahdi, Whiko Androser Mochamad Asrofi mur dani murdani Mustafa, Rolandi Rusdi, M.F.R. Saputra M, Dendi Adi Siswandi B Zul Nain Zulkarnain Zulkarnain