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Publications
Costa, P.M. and Chen, B.Q. (2025), Numerical analysis of welding residual stress in subsea pipelines: Guidelines for experimental validation, Innovations in the Analysis and Design of Marine Structures, Garbatov, Y. & Guedes Soares C. (Eds.), Taylor & Francis, London, UK, 91-98.
Subsea pipelines have been operational for several decades, and many are nearing the end of their service life due to prolonged exposure to corrosive and dynamic marine environments. Therefore, the study of welding residual stress (WRS) is paramount as it directly impacts these pipelines' fatigue assessment and structural integrity. This research employs the double ellipsoidal heat source model in ANSYS Mechanical APDL to simulate the moving heat source in single and double-pass welds. The finite element analysis (FEA) developed in this study is validated by comparing its results with experimental data from a published paper. The comparison reveals a good agreement, demonstrating the model’s accuracy in predicting residual stresses. Sensitivity analyses indicate that precise placement of thermocouples within 0.1 mm is critical for accurate measurements, and attention to boundary conditions significantly impacts the results of WRS. Sensitivity analyses were conducted on velocity, welding parameters, material type, heat source parameters, and double-pass welds to understand their effects better.
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