https://matjournals.net/engineering/index.php/JOMME <p><strong>JOMME</strong> is a peer reviewed Journal in the discipline of Engineering published by the MAT Journals Pvt. Ltd. The Journal provides a platform to Researchers, Academicians, Scholars, Professionals and students in the Domain of Mechanical Engineering to promulgate their Research/Review/Case studies in the field of Mechanical and Mechanics Engineering. The Journal aims to promote high quality empirical Research, Review articles, case studies and short communications mainly focused on Materials, Thermodynamics, Heat Transfer, Energy, Fuels, Combustion, IC Engine, Fluid mechanics, Mechanisms, Design, Instrumentation and Manufacturing Engineering, Technology, or Processes.</p> en-US Journal of Mechanical and Mechanics Engineering https://matjournals.net/engineering/index.php/JOMME/article/view/4185 <p><em>This paper analyses the fatigue failure mechanisms that govern the residual life of critical tubular joints on a representative Gulf of Guinea (GoG) steel jacket platform. Both the conventional S–N (Palmgren–Miner cumulative damage) and fracture-mechanics (Paris–Erdogan crack-growth) approaches are applied, with explicit inclusion of time-dependent corrosion and structural ageing effects. Six representative joints (J1–J6) are examined under realistic operational loading. Deterministic S–N calculations yield a 25-year damage ratio of 1.85 and an implied residual life of 13.5 years for the governing lower-bay K-joint (J5). Independent fracture-mechanics analysis, initiated from a representative surface crack depth a₀ = 0.5 mm, produces a crack-propagation life of 13.5 years for the same joint, confirming consistency between the two methodologies. Parametric studies incorporating corrosion rates in the range 0.1–0.4 mm/year demonstrate that progressive wall thinning and associated stress elevation reduce remaining fatigue life by 9%–28%. The results highlight the necessity of integrating corrosion-fatigue interaction into residual-life assessments of ageing GoG jackets and provide a validated basis for inspection prioritisation and life-extension decisions.</em></p> Wali S. A Copyright (c) 2026 Journal of Mechanical and Mechanics Engineering 2026-09-29 2026-09-29 1 10 10.46610/JOMME.2026.v12i02.001