Overview of effect of residual stress, elastic follow-up & stress redistribution using whole structure approach

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Structural integrity assessments of components require accurate predication of failure of components. One of the major challenges while doing structural integrity assessment is to understand whether the presence of residual stresses in the component acts a major part in the failure of complete structure or not. Residual stresses may arise during manufacturing, fabrication or can also get induced during service and with addition of applied load promote failure at much below safe design loads. In general, residual stresses are considered as secondary stresses but in cases where they doesn’t self-equilibrate in the structure, leads to plastic collapse, they should be treated as primary stresses. Whether residual stresses contribute to failure or not depend upon the overall elastic follow-up of the structure which will affect the residual force distribution during the process of crack extension and plastic deformation and applied load the structure is subjected to. In this paper, an overview of importance of elastic follow-up in the structure’s integrity analysis and the benchmark models are presented to study the outcome of stress redistribution, elastic follow-up and residual stresses.