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Publications
Gordo, J.M. (2014), “Residual stresses relaxation of welded structures under alternate loading”, Developments in Maritime Transportation and Exploitation of Sea Resources, Guedes Soares, C. and López Peña F. (Eds.). Francis & Taylor Group, London, UK, pp. 317-328
As-built welded ship structures retain internal residual stresses after being manufactured that affect the structural performance of ship’s components like plates, stiffened plates or more complex structures. The operation of the ship subjects the structure and its components to alternate loading that releases these residual stresses, total or partially, under certain conditions. The objective of this work is to analyse the stress relief process under in-plane alternate loading and to establish a formulation suitable for application on simplified methods of ship’s structural analyses.
The residual stresses relaxation on unstiffened and stiffened plates is formulated and the correction to material stress-strain curves is presented for any stage of the relaxation process.
The balance of energy during the relaxation process is estimated in order to allow the evaluation of initial residual stresses level.
Finally it is presented the impact of residual stresses relief in the structural response of box girders under bending moment due to the application of several cycles of loading and unloading.
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