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

J. Nafar Dastgerdi*, F. Sheibanian, H. Remes, P. Lehto, H. Hosseini Toudeshky

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

12 Lataukset (Pure)

Abstrakti

This 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.

AlkuperäiskieliEnglanti
Artikkeli106387
Sivumäärä13
JulkaisuJournal of Constructional Steel Research
Vuosikerta175
Varhainen verkossa julkaisun päivämäärä3 lokakuuta 2020
DOI - pysyväislinkit
TilaSähköinen julkaisu (e-pub) ennen painettua julkistusta - 3 lokakuuta 2020
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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