Experimental and numerical investigation of the weld geometry effects on Type IV cracking behaviour in P91 steel

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dc.contributor.author Mehmanparast, Ali
dc.contributor.author Yatomi, M.
dc.contributor.author Biglari, F.
dc.contributor.author Maleki, S.
dc.contributor.author Nikbin, K.
dc.date.accessioned 2021-01-28T15:33:20Z
dc.date.available 2021-01-28T15:33:20Z
dc.date.issued 2020-08-11
dc.identifier.citation Mehmanparast A, Yatomi M, Biglari F, et al., (2020) Experimental and numerical investigation of the weld geometry effects on Type IV cracking behaviour in P91 steel. Engineering Failure Analysis, Volume 117, November 2020, Article number 104826 en_UK
dc.identifier.issn 1350-6307
dc.identifier.uri https://doi.org/10.1016/j.engfailanal.2020.104826
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/16277
dc.description.abstract The focus of the present study is on creep crack growth behaviour in Type IV region of P91 steel weldments at 650 °C. In the experimental studies on small- and large-scale single-edge notched specimens in tension, SENT, the effects of weld dimensions and specimen size on the creep crack growth behaviour of the material are investigated. The experimental results demonstrate that the crack starts to propagate at an angle normal to the loading direction, subsequently deviates towards the Type IV region and the specimen eventually ruptures when the crack growth angle becomes parallel to the loading direction. The creep rupture data for SENT specimens compared well with those of the round bar specimens for P91 welded joints. In addition, the data for crack growth rates from the deviating crack path were correlated with the C* fracture mechanics parameter and showed good agreement with standard compact tension test data. To predict the creep crack growth behaviour in the Type IV region, finite element simulations were performed in conjunction with a multiaxial ductility damage criterion at the weld/base metal interface. Given that a lower failure strain along the Type IV region is prominent, it is shown that the cracking, in line with the experiments, followed the HAZ region and led to the final creep rupture in the net section en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.subject P91 en_UK
dc.subject High temperature failure en_UK
dc.subject Large-scale testing en_UK
dc.subject Creep crack growth en_UK
dc.subject Type IV cracking en_UK
dc.title Experimental and numerical investigation of the weld geometry effects on Type IV cracking behaviour in P91 steel en_UK
dc.type Article en_UK


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