Numerical modelling approach for considering effects of surface integrity on micro-crack formation

dc.contributorAalto Universityen
dc.contributor.authorNafar Dastgerdi, J.en_US
dc.contributor.authorSheibanian, F.en_US
dc.contributor.authorRemes, H.en_US
dc.contributor.authorLehto, P.en_US
dc.contributor.authorHosseini Toudeshky, H.en_US
dc.contributor.departmentDepartment of Mechanical Engineeringen
dc.contributor.groupauthorMarine Technologyen
dc.contributor.organizationAmirkabir University of Technologyen_US
dc.description| openaire: EC/H2020/723246/EU//RAMSSES
dc.description.abstractThis work studies the simultaneous effects of surface roughness and residual stress on the micro-crack formation under peak load conditions. The manufacturing process of e.g. steel components influences the surface topography and the material microstructure. These changes affect the surface integrity, which in turn define the component's mechanical properties such as fatigue strength. This paper introduces an efficient finite-element based approach to analyze the influence of surface roughness, residual stress, and microstructural composition on micro-crack formation mechanism during monotonic peak load. The proposed approach combines surface roughness profiles, a ductile fracture criterion and a layer-wise residual stress definition for an approach that is suitable for surface integrity analysis. An inverse numerical-experimental approach is presented for the calibration of the ductile fracture criterion under different stress states. The developed approach is applied to a sandblasted S690 high strength steel, in which the surface integrity has been altered by the manufacturing process. The possibility of crack initiation in the vicinity of critical micro notches is investigated, and the influence of surface roughness and residual stresses is studied. The proposed modelling principles and calibration approach can be employed for other materials and surface profiles.en
dc.description.versionPeer revieweden
dc.identifier.citationNafar Dastgerdi, J, Sheibanian, F, Remes, H, Lehto, P & Hosseini Toudeshky, H 2020, ' Numerical modelling approach for considering effects of surface integrity on micro-crack formation ', Journal of Constructional Steel Research, vol. 175, 106387 .
dc.identifier.otherPURE UUID: 1fc7fb82-3e6b-4cc7-8cac-06725151cd35en_US
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dc.publisherELSEVIER SCI LTD
dc.relation.ispartofseriesJournal of Constructional Steel Researchen
dc.relation.ispartofseriesVolume 175en
dc.subject.keywordFinite element methoden_US
dc.subject.keywordMicro-crack formationen_US
dc.subject.keywordResidual stressesen_US
dc.subject.keywordSurface roughnessen_US
dc.titleNumerical modelling approach for considering effects of surface integrity on micro-crack formationen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi