2026-04-28T19:31:16Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/56692023-04-30T22:42:12Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505

Díaz Portugal, Andrés 147 500 0000-0002-2344-1955 Cuesta Segura, Isidoro Iván 135 500 0000-0003-4088-9302 Rodríguez, C. c93a9dfd-ed83-402e-98c4-e465edbf520d 500 Alegre Calderón, Jesús Manuel 16 500 0000-0003-3629-2570 2021-03-25T09:59:59Z 2021-03-25T09:59:59Z 2021-04 0167-8442 http://hdl.handle.net/10259/5669 10.1016/j.tafmec.2020.102879 Hydrogen assisted fracture near welds is the result of a combination of microstructural changes and the accumulation of hydrogen. With the aim of predicting local hydrogen concentrations, hydrogen redistribution near a crack tip is simulated using a Boundary Layer approach and diffusion modelling is modified by trapping phenomena. The simulated non-homogeneous geometry includes layers that reproduce weld metal, heat affected zones and base metal of a 2.25Cr-1Mo steel; mechanical and diffusion properties have been extracted from references. The hydrogen transport model here considered involves a stress dependency that affects local concentrations; thus, the possible interaction between constraint effects associated to a graded material with hydrogen entry and transport is studied. Results show that the constraint effect is not significative for the loading and for the widths assigned to the weld and the heat affected zones (2.5 to 5 mm); however, for the HAZ-centred crack, a higher hydrostatic peak and the corresponding increase in lattice hydrogen are found. A two-type trapping process is also simulated to reproduce simultaneously the effect of dislocation trapping and microstructure delayed diffusion. Hydrogen is weakly trapped in dislocations and it is added to the lattice concentration to obtain a measure of diffusible hydrogen near a crack tip while effective diffusivity is strongly reduced by deeply trapped hydrogen. Differences between environmental or internal hydrogen sources are expected to be more accurately captured because stress-dependent boundary conditions have been implemented for hydrogen uptake. Ministry of Science, Innovation and Universities of Spain through gran RTI2018-096070-B-C33 application/pdf eng Elsevier Theoretical and Applied Fracture Mechanics. 2021, V. 112, 102879 https://doi.org/10.1016/j.tafmec.2020.102879 info:eu-repo/grantAgreement/MICINN/RTI2018-096070-B-C33 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Hydrogen embrittlement Fracture Mechanics Hydrogen diffusion Welding Finite Element simulation Resistencia de materiales Strength of materials Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Theoretical and Applied Fracture Mechanics 112 102879 TEXT Diaz-tafm_2021.pdf.txt Diaz-tafm_2021.pdf.txt Extracted text text/plain 62160 https://riubu.ubu.es/bitstream/10259/5669/5/Diaz-tafm_2021.pdf.txt d2c3453fa42eee59e0154f067e6e5739 MD5 5 THUMBNAIL Diaz-tafm_2021.pdf.jpg Diaz-tafm_2021.pdf.jpg IM Thumbnail image/jpeg 4791 https://riubu.ubu.es/bitstream/10259/5669/4/Diaz-tafm_2021.pdf.jpg 276be183f7d189671260cc7831cd534f MD5 4 LICENSE license.txt license.txt text/plain; charset=utf-8 999 https://riubu.ubu.es/bitstream/10259/5669/3/license.txt b295bcbce42e2caabeb0c623d3860c06 MD5 3 CC-LICENSE license_rdf license_rdf application/rdf+xml; charset=utf-8 805 https://riubu.ubu.es/bitstream/10259/5669/2/license_rdf 4460e5956bc1d1639be9ae6146a50347 MD5 2 ORIGINAL Diaz-tafm_2021.pdf Diaz-tafm_2021.pdf application/pdf 2831546 https://riubu.ubu.es/bitstream/10259/5669/1/Diaz-tafm_2021.pdf bbd83b53fd4f9ddc215419f72e718c33 MD5 1 10259/5669 oai:riubu.ubu.es:10259/5669 2023-05-01 00:42:12.182 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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