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All Journal FLYWHEEL : Jurnal Teknik Mesin Untirta Journal of Community Service in Science and Engineering Trends in Mechanical Engineering Research
Sunardi, Sunardi
Universitas Sultan Ageng Tirtayasa
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 Mathematics Mechanical Engineering Physics Transportation

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COMPARATIVE STUDY OF ADHESIVE STRENGTH IN MAHOGANY WOOD LAMINATED COMPOSITES Oetama, Pandoe Satria; Sunardi, Sunardi; Ula, Shofiatul; Yusuf, Yusvardi; Dwinanto, Dwinanto; Listijorini, Erny; Santosa, Irfan
Trends in Mechanical Engineering Research Vol 3, No 01 (2025): June
Publisher : Department of Mechanical Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/timer.v3i01.34091

Abstract

Adhesive technology has seen significant advancements in recent years. Compared to welding or threaded joints, adhesives provide a straightforward mechanism for joining material interfaces. Due to practicality allows for the potential development of adhesives with strengths comparable to those of traditional joints. In this study, a modified type of Polyvinyl Acetate (PVAc) adhesive was utilized as a binder for mahogany wood surfaces. The choice of PVAc adhesive is due to its common use in everyday applications, particularly in the woodworking industry. Additionally, this adhesive is relatively safe for both health and the environment. The study examined three types of adhesives: PVAc white adhesive, PVAc yellow adhesive, and a combination of the PVAc white and yellow adhesive. These adhesives were used to bond the wood surfaces, and the bond strength at the interface was evaluated through a flexural test. The results showed that the adhesive strength of white adhesive reached 111 MPa, while the mixed adhesive and yellow adhesive exhibited flexural strengths of 74.2 MPa and 63.4 MPa, respectively. Notably, the presence of white glue was found to enhance the flexural strength of mahogany wood even in the absence of adhesive.
Empowering Floating Net Cage Fish Farmers Through Educational Strategies in Bohe Silian Village, Berau, East Kalimantan Santosa, Irfan; Farid, Ahmad; Rusnoto, Rusnoto; Siswiyanti, Siswiyanti; Laga, Surya; Sunardi, Sunardi
Journal of Community Service in Science and Engineering (JoCSE) Vol 5, No 1 (2026): Available Online in April 2026
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jocse.v5i1.39755

Abstract

Cantang grouper (Epinephelus fuscoguttatus × Epinephelus lanceolatus) is a high-value aquaculture commodity in Indonesia. However, small-scale farmers in remote areas such as Bohe Silian Village, Berau, frequently suffer significant economic losses due to high fish mortality rates caused by poor health management and fluctuating water quality. This study aims to evaluate the effectiveness of a strategic educational intervention in enhancing farmers' technical capacity for fish health management in floating net cages (Keramba Jaring Apung/ KJA). A participatory community empowerment approach was employed, combining theoretical socialization, on-site demonstrations, and intensive mentoring. The results program significantly improved farmers' multidimensional knowledge and technical skills in water quality and disease management, with success rates of 79%, 97%, 79%, and 80%, across technical, ecological, economic, and social aspects, respectively. Ultimately, the initiative demonstrated that participatory education strategies effectively strengthen the resilience of small-scale aquaculture in remote coastal areas.
Microstructure Features and Degradation Mechanisms of Low-Pressure Evaporator Tube Steels in Combined Cycle Power Plants Nugraha, YangYang Gilang; Erwin, Erwin; Listijorini, Erny; Dwinanto, Dwinanto; Alhamidi, Ahmad Ali; Satria, Dhimas; Saefuloh, Iman; Yusuf, Yusvardi; Sunardi, Sunardi
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 10, No 2 (2024): October
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v10i2.39002

Abstract

A leakage failure occurred in a low-pressure evaporator tube of a Heat Recovery Steam Generator (HRSG) in a combined cycle power plant. The failed tube, manufactured from ST 37.8 CL1 steel, was investigated to determine the root cause of failure. The analysis included visual inspection, metallographic examination, and hardness testing. Visual observation revealed localized leakage regions associated with material degradation. Metallographic analysis showed a ferrite–pearlite microstructure with pronounced pearlite growth and the presence of micro-cavities concentrated along grain boundaries. Hardness measurements indicated that the failed tube exhibited higher hardness values (average 83.3 HRB) compared to unused material (average 76.6 HRB), reflecting microstructural evolution during service. The tube operated at approximately 143.8 °C under continuous internal pressure. Long-term exposure to these conditions promoted creep damage, characterized by the nucleation of micro-cavities at ferrite–pearlite interfaces. Progressive cavity growth and coalescence reduced ductility and facilitated crack initiation, ultimately leading to leakage. The findings demonstrate that creep-induced cavity formation associated with pearlite growth was the primary failure mechanism of the low-pressure evaporator tube.
Co-Authors Alhamidi, Ahmad Ali Dhimas Satria Dwinanto, Dwinanto Erwin, Erwin Laga, Surya Listijorini, Erny Nugraha, YangYang Gilang Oetama, Pandoe Satria Rusnoto, Rusnoto Saefuloh, Iman Santosa, Irfan Siswiyanti, Siswiyanti Ula, Shofiatul Yusuf, Yusvardi