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All Journal Jurnal Teknik Mesin Scientific Journal of Mechanical Engineering Kinematika
Eko Pujiyulianto
Institut Teknologi Sumatera
Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Effect of Layers on Delamination and Tensile Strength of Woven Fiber Composites with Polyester Matrix Fajar Paundra; Danang Istanto; Eko Pujiyulianto; Muhamad Fatikul Arif; Sri Hastuti
Jurnal Teknik Mesin (Sinta 3) Vol. 21 No. 1 (2024): APRIL 2024 (SINTA 3)
Publisher : Institute of Research and Community Outreach, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/jtm.21.1.11-20

Abstract

A composite is a combination of 2 or more different materials. The composite joining process can use adhesives or mechanically by making holes. During the process of making holes in the composite, it can cause delamination in the composite. Delamination and layer thickness greatly influence the strength of hollow composite joints. This research aims to determine the effect of delamination factors and the number of layers on the tensile strength value of the composite. The materials used in this research are polyester resin and woven glass fiber. The method used is vacuum bagging with variations in the number of layers, namely 3 layers, 4 layers, 5 layers, and 6 layers. Tensile testing refers to ASTM D638 standards. Specimens that have been cut according to standards will then be perforated in the center with a hole diameter of 4 mm using a milling machine. The highest tensile strength value was obtained in the 6-layer variation of 237.448 MPa and the lowest value was obtained in the 3-layer variation of 186.221 MPa. The delamination value greatly influences the tensile strength of the composite, where the more layers, the delamination value will decrease and increase the tensile strength of the composite.
EVALUASI UMUR SISA SHELL COOLER CL-5 DENGAN METODE FITNESS FOR SERVICE-1/API 579 Eko Pujiyulianto; Herry Wardono; Irza Sukmana; Saka Mahidaya Hutama; Fajar Paundra
Scientific Journal of Mechanical Engineering Kinematika Vol 8 No 2 (2023): SJME Kinematika Desember 2023
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v8i2.273

Abstract

This research aims to evaluate the remaining life of the CL-5 shell cooler using the fitness for service method (FFS-1/API 579). The evaluation is conducted through the inspection process of components using Non-Destructive Testing (NDT) methods. This study is aimed at identifying thickness changes, analyzing the types of corrosion occurring in the CL-5 shell cooler, calculating the minimum allowable shell thickness, determining the Maximum Allowable Working Pressure (MAWP), estimating the corrosion rate, assessing the remaining life, and determining the operational feasibility of these components. Calculations are performed using the FFS-1/API 579 standard. The research results indicate that the total loss in 2011 and 2021 was 0.2 mm and 0.414 mm, respectively. The corrosion rates observed on the CL-5 shell cooler in 2011 and 2021 were 0.067 mm/year and 0.13 mm/year. Based on the minimum thickness and MAWP values evaluation, the CL-5 shell cooler is still fit for operation. Analysis of the remaining life of the CL-5 shell cooler indicates that the remaining life in 2011 and 2021 was 7.81 years and 6.83 years, respectively. Based on the above description, it can be concluded that the CL-5 shell cooler can still be operated.
ANALISIS TEGANGAN DAN MODULUS ELASTISITAS STRUKTUR KISI YANG DI DESAIN MENGGUNAKAN SCRIPT BERBASIS PYTHON Eko Pujiyulianto; Muhamad Fatikul Arif; Abdul Muhyi; Fajar Paundra; Ariq Athallah; Daniel Christover Munte
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 1 (2025): SJME Kinematika Juni 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i1.572

Abstract

This study aims to evaluate TPMS lattice structure designs using Python scripts, which will later be used for lattice shell helmet designs. The structural design evaluation will be performed using numerical methods by varying the volume fraction. The lattice structures to be evaluated include FischerKochS, Honeycomb, pmy, and SchoenFRD. The CAD models of the lattice structures will be generated using Python-based scripts. The volume fraction variations are achieved by altering the shell thickness values in the Python scripts. The analysis will be conducted using numerical methods based on finite element analysis with static analysis and an elastic material model. The material used is ABS. Based on the research results, it indicates that the thickness specified in the script (thickness) cannot be defined as the actual shell thickness. The relationship between thickness and volume fraction indicates that each lattice structure will produce a different volume fraction when the shell thickness is varied. As the shell thickness increases, the volume fraction of the lattice structure also increases. volume fraction in lattice structures does not affect stress in a linear manner. The highest stress is observed in the pmy structure, followed by the Honeycomb and FischerKochS structures, while the SchoenFRD structure exhibits the lowest stress values. The most suitable design for use as a lattice structure in helmets is the ScheonFRD design. This is due to the design capability of ScheonFRD in distributing stress across the structure.
Co-Authors Abdul Muhyi Ariq Athallah Danang Istanto Daniel Christover Munte Fajar Paundra Herry Wardono Irza Sukmana Muhamad Fatikul Arif Saka Mahidaya Hutama Sri Hastuti