A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Shot peening effects on residual stresses redistribution of offshore wind monopile multi-pass weldments
https://orcid.org/0000-0002-7099-7956
Abstract In some industrial applications, welding is the only alternative to join different parts. However, the major problem in welded structures is the tensile residual stresses that are inevitably produced during welding process. Surface tensile stresses can threaten the performance of the weldments as they act as an accelerant in fatigue crack initiation and failure. Shot peening is a well-known method which can enhance weldments' fatigue performance and longevity by inducing surface compressive residual stresses in order to eliminate or limit tensile residual stresses. In this study, the effect of shot peening on redistribution of multi-pass welding residual stresses was numerically and experimentally investigated on very large components typical of welded joints used in offshore wind turbine monopiles. In experimental part of the study, the residual stresses were measured using the Incremental Centre Hole Drilling (ICHD) method before and after shot peening. Finite element studies were carried out using 3D welding models and random shot peening analyses. Moreover, extensive finite element analyses were conducted to study the effect of model dimensions and the number of passes on prediction of welding residual stresses. Interesting set of results obtained from both the numerical studies and the ICHD measurements were in good agreements and showed that shot peening can be advantageous even for large components with multi-pass welded joints. Additionally, reducing the number of weld passes in finite element models could considerably lower the computational time without affecting the accuracy of results at surface regions of the models.
Highlights Shot peening process could be effectively used for treating the multi-pass welding induced residual stresses in offshore wind turbine monopiles. For very large samples which contain a large number of weld passes, only simulating the few near surface passes could result in the prediction of “near surface” residual stresses with high accuracy. Even in very large structures with multipasses weld and high levels of tensile stresses, shot peening is remarkably profitable by introducing favourable compressive stresses on and near the surface. Applying the shot peening process on the weld + grind flush specimen resulted in a lucrative outcome as the as-welded specimen. Grind flushing the weld beads could itself lessen the level of welding residual stresses and introducing the equi-biaxial stresses in welded samples.
Shot peening effects on residual stresses redistribution of offshore wind monopile multi-pass weldments
https://orcid.org/0000-0002-7099-7956
Abstract In some industrial applications, welding is the only alternative to join different parts. However, the major problem in welded structures is the tensile residual stresses that are inevitably produced during welding process. Surface tensile stresses can threaten the performance of the weldments as they act as an accelerant in fatigue crack initiation and failure. Shot peening is a well-known method which can enhance weldments' fatigue performance and longevity by inducing surface compressive residual stresses in order to eliminate or limit tensile residual stresses. In this study, the effect of shot peening on redistribution of multi-pass welding residual stresses was numerically and experimentally investigated on very large components typical of welded joints used in offshore wind turbine monopiles. In experimental part of the study, the residual stresses were measured using the Incremental Centre Hole Drilling (ICHD) method before and after shot peening. Finite element studies were carried out using 3D welding models and random shot peening analyses. Moreover, extensive finite element analyses were conducted to study the effect of model dimensions and the number of passes on prediction of welding residual stresses. Interesting set of results obtained from both the numerical studies and the ICHD measurements were in good agreements and showed that shot peening can be advantageous even for large components with multi-pass welded joints. Additionally, reducing the number of weld passes in finite element models could considerably lower the computational time without affecting the accuracy of results at surface regions of the models.
Highlights Shot peening process could be effectively used for treating the multi-pass welding induced residual stresses in offshore wind turbine monopiles. For very large samples which contain a large number of weld passes, only simulating the few near surface passes could result in the prediction of “near surface” residual stresses with high accuracy. Even in very large structures with multipasses weld and high levels of tensile stresses, shot peening is remarkably profitable by introducing favourable compressive stresses on and near the surface. Applying the shot peening process on the weld + grind flush specimen resulted in a lucrative outcome as the as-welded specimen. Grind flushing the weld beads could itself lessen the level of welding residual stresses and introducing the equi-biaxial stresses in welded samples.
Shot peening effects on residual stresses redistribution of offshore wind monopile multi-pass weldments
https://orcid.org/0000-0002-7099-7956
Abstract In some industrial applications, welding is the only alternative to join different parts. However, the major problem in welded structures is the tensile residual stresses that are inevitably produced during welding process. Surface tensile stresses can threaten the performance of the weldments as they act as an accelerant in fatigue crack initiation and failure. Shot peening is a well-known method which can enhance weldments' fatigue performance and longevity by inducing surface compressive residual stresses in order to eliminate or limit tensile residual stresses. In this study, the effect of shot peening on redistribution of multi-pass welding residual stresses was numerically and experimentally investigated on very large components typical of welded joints used in offshore wind turbine monopiles. In experimental part of the study, the residual stresses were measured using the Incremental Centre Hole Drilling (ICHD) method before and after shot peening. Finite element studies were carried out using 3D welding models and random shot peening analyses. Moreover, extensive finite element analyses were conducted to study the effect of model dimensions and the number of passes on prediction of welding residual stresses. Interesting set of results obtained from both the numerical studies and the ICHD measurements were in good agreements and showed that shot peening can be advantageous even for large components with multi-pass welded joints. Additionally, reducing the number of weld passes in finite element models could considerably lower the computational time without affecting the accuracy of results at surface regions of the models.
Highlights Shot peening process could be effectively used for treating the multi-pass welding induced residual stresses in offshore wind turbine monopiles. For very large samples which contain a large number of weld passes, only simulating the few near surface passes could result in the prediction of “near surface” residual stresses with high accuracy. Even in very large structures with multipasses weld and high levels of tensile stresses, shot peening is remarkably profitable by introducing favourable compressive stresses on and near the surface. Applying the shot peening process on the weld + grind flush specimen resulted in a lucrative outcome as the as-welded specimen. Grind flushing the weld beads could itself lessen the level of welding residual stresses and introducing the equi-biaxial stresses in welded samples.
Shot peening effects on residual stresses redistribution of offshore wind monopile multi-pass weldments
Khajeian, A. (author) / Mahmoudi, A.H. (author) / Mehmanparast, A. (author)
Marine Structures ; 66 ; 106-120
2019-03-18
15 pages
Article (Journal)
Electronic Resource
English
Corrosion fatigue crack growth mechanisms in offshore monopile steel weldments
| British Library Online Contents | 2017
Modelling of Shot Peening Residual Stresses - Practical Application
| British Library Online Contents | 1994
Analytical modelling for residual stresses produced by shot peening
| British Library Online Contents | 2009
Analytical modelling for residual stresses produced by shot peening
| Elsevier | 2008
| European Patent Office | 2020