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 https://matjournals.net/engineering/index.php/JOMME/article/view/4266 <p><em>Productivity improvement is a central objective of every manufacturing organization, yet many plants look first to new equipment before examining how work is actually performed. Work study offers a systematic and low-capital alternative. It combines method study, which seeks a simpler and more effective way of doing a job, with work measurement, which establishes the time a qualified worker needs to do that job at a defined level of performance. This paper presents a structured study of productivity and work study in manufacturing operations: the definition and measurement of productivity, the basic procedure of method study and its recording techniques, micro- and macro-motion study with the principles of motion economy, work measurement by time study, work sampling and predetermined motion time systems, and an introduction to ergonomics. A functional classification maps each recording technique to the kind of inefficiency it exposes, and a worked time-study calculation with assumed values traces observed time through rating and allowances to standard time. An illustrative before-and-after comparison shows how a method improvement is converted into a quantified productivity gain. The classification indicates that unnecessary handling, idle time, and long movement are the highest-impact sources of lost productivity, that method study should precede work measurement, and that a consolidated checklist can support routine application of work study in a plant.</em></p> V. K. Patel Shrimali Aryan Nileshbhai Copyright (c) 2026 Journal of Mechanical and Mechanics Engineering 2026-10-09 2026-10-09 11 21