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All Journal Mekanika: Majalah Ilmiah Mekanika
Ristiyanto Adiputra
Research Center for Hydrodynamics Technology, National Research and Innovation Agency, Surabaya, Indonesia

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Finite Element Modeling of Thickness Reduction and Displacement Behavior in 316L Stainless Steel Plates Under Corrosion States Oleksiy Melnyk; Daffa Putra Islami; Ristiyanto Adiputra
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i2.102853

Abstract

Structural steel corrosion is a critical engineering problem that can lead to catastrophic failures, resulting in loss of life, environmental harm, and substantial economic damage. Notable incidents, such as offshore platform collapses and ship hull breaches, have demonstrated the severe consequences of undetected or underestimated corrosion. In marine environments, crevice corrosion presents a particularly challenging case, as confined chemical conditions and the presence of barnacles promote localized degradation. Barnacles generate microcracks that accelerate the deterioration process. However, finite element modeling of crevice corrosion remains scarce and often relies on oversimplified geometries, which limits the accuracy in capturing actual corrosion volume, depth, and affected area. This study develops a 3D finite element model of barnacle-induced crevice corrosion on 316L stainless steel plates, based on long-term immersion data. Corrosion geometries were analyzed using laser scanning microscopy, with the analytical mapped field feature applied under transverse loading and random pit positions for exposure durations of 6, 12, and 36 months. The results reveal progressive increases in displacement (up to 17.27%), strain (30.8%), and stress (20.12%) compared to uncorroded plates, underscoring the substantial impact of localized corrosion on structural performance.
Seakeeping Analysis of Floating Structures with Pipe Integration Based on the Boundary Element Method Svitlana Onyshchenko; Alfido Marchandi Faizatama; Nurman Firdaus; Ristiyanto Adiputra
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i2.103847

Abstract

Floating structures are key components in offshore renewable energy systems. In the development of energy conversion, several integrated components are required, one of which is the Cold-Water Pipe (CWP). This integration will affect the interaction of the structure with environmental loads such as waves and currents, which influence the stability and seakeeping of the structure. This study employs computational analysis based on the Boundary Element Method (BEM) to more efficiently evaluate the hydrodynamic response of full-scale structures. Response Amplitude Operator (RAO), additional mass, motion response, and mooring line tension are identified as the main parameters. It was found that all these parameters are sensitive to mesh discretization. A mesh convergence study was conducted using mesh sizes of 1.8, 2.1, 2.2, and 2.3 m, which produced consistent RAO and additional mass values. Conversely, mesh sizes of 1.9, 2.0, 2.4, and 2.5 m showed inconsistencies in stability results at sea. The coarsest net (2.5 m) produced errors of up to 33% in swing, heave, and roll motions, with greater deviations in heave motion. However, tension on the mooring line remained relatively stable, indicating reduced sensitivity to variations in net size.
Co-Authors Alfido Marchandi Faizatama Nurman Firdaus