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Frengki Mohamad Felayati
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International Journal of Marine Engineering and Applications Department of Marine Engineering, Universitas Hang Tuah Jl. Arief Rahman Hakim No.150, Surabaya, Jawa Timur, Indonesia 60111
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International Journal of Marine Engineering and Applications
Published by Universitas Hang Tuah
ISSN : -     EISSN : 3063640X     DOI : https://doi.org/10.30649/ijmea.v2i2
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Engineering Mechanical Engineering Transportation
International Journal of Marine Engineering and Applications is a peer-reviewed, open-access journal dedicated to advancing the field of marine engineering and its diverse applications. With a focus on promoting high-quality research and innovative solutions, IJMEA is a premier platform for researchers, engineers, academicians, and practitioners worldwide. At IJMEA, our mission is to facilitate the dissemination of high-quality research and development in marine engineering and related areas, fostering collaboration and knowledge exchange among experts from various disciplines. We aim to contribute to the sustainable advancement of marine technology, addressing challenges and exploring opportunities in maritime industries and marine sciences. IJMEA welcomes original research articles, review papers, technical notes, and case studies covering a broad spectrum of topics in marine engineering and applications, including but not limited to: - Ship design, construction, and operation - Marine engineering - Marine production and manufacture - Naval architecture - Marine propulsion systems - Mechanical engineering - Offshore engineering - Ocean renewable energy - Maritime safety and environmental protection - Coastal engineering - Marine robotics and autonomous systems - Underwater technology - Marine materials and corrosion - Port and harbor engineering - Marine resource management
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 22 Documents
 1   2   3 
CFD SIMULATION OF THERMAL CHARACTERISTICS IN T-JOINT WELDING TO PREDICT INCOMPLETE FUSION DEFECTS Alfian Nur Pratama; Hardianto, Didik; Kristiyono, Tri Agung
IJMEA International Journal of Marine Engineering and Applications Vol 3 No 2 (2026): September 2026
Publisher : Department of Marine Engineering, Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/ijmea.v3i2.409

Abstract

Welding is a critical process in marine and shipbuilding structures, particularly in T-joint configurations. However, uneven heat distribution during the fluid phase of welding often leads to incomplete fusion at the weld root. This study analyzes the thermal-mechanical characteristics of S50C medium carbon steel T-joint welding using Computational Fluid Dynamics (CFD) with a sequential thermal-structural finite element approach. The numerical model was discretized into a refined mesh configuration with 2,635 nodes and 660 elements. To model the residual thermal load from the CFD fluid phase, a constant thermal boundary condition of 400°C was applied as a ramped load to three base plate surfaces. Simulation results showed extreme residual stress accumulation concentrated at the weld root area. Linear path analysis along the "Strain Check" line revealed a rapid stress gradient increase from -1749.4 MPa to 392.06 MPa. Normal stress parameters recorded maximum compressive stress of -2503 MPa and peak tensile residual stress of 580.58 MPa. Normal strain parameters recorded minimum compressive strain of -4.6037 × 10⁻³ mm/mm and peak tensile strain of 3.9789 × 10⁻³ mm/mm. The peak residual stress value exceeded the ultimate tensile strength of S50C steel (580.58 MPa > 460 MPa). This thermal residual stress excess provides scientific validation for predicting structural failure initiation and internal notches, aligning with the 66 mm incomplete fusion defect track found in laboratory macroetch testing.
MODEL OF PLANNED MAINTENANCE SYSTEM FOR SHIPS AND SPECIAL SAFETY EQUIPMENT FOR XYZ INSTITUTION Sujagad, Mohammad Addam; Aditya, Bagus Kusuma; Kristiyono, Tri Agung
IJMEA International Journal of Marine Engineering and Applications Vol 3 No 2 (2026): September 2026
Publisher : Department of Marine Engineering, Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/ijmea.v3i2.411

Abstract

Patrol boats and specialized safety equipment operated by Institution XYZ play a vital role in maintaining maritime security and supporting search and rescue (SAR) operations. However, their maintenance activities have not been supported by a structured maintenance guideline. The research objects include Rigid Inflatable Boats (RIBs), motorized inflatable boats, and diving equipment used for patrol and search and rescue operations. A qualitative descriptive method was employed through a literature review, field observations, interviews, and condition assessments of the vessels and equipment. The results indicate that the operational assets remain serviceable, although several components require routine maintenance, spare-part replacement, and corrective repairs. Based on the survey findings, a Planned Maintenance System was developed, consisting of annual maintenance schedules, five-year special surveys, and maintenance recommendations for vessel structures, propulsion systems, navigation equipment, and safety equipment. The analysis showed that the highest maintenance requirements were identified for RIB 600 in the third year and RIB 500 in the fourth year, with eight maintenance items each. Meanwhile, RIB 850 and RIB 85 required the most maintenance in the fourth and fifth years, with eleven maintenance items each. The proposed Planned Maintenance System provides a structured maintenance guideline that can improve maintenance planning, support operational readiness, and enhance the reliability of patrol vessels and specialized safety equipment at Institution XYZ.

Page 3 of 3 | Total Record : 22

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