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

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-12
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
Journal of Constructional Steel Research, Volume 175
Abstract
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.
Description
| openaire: EC/H2020/723246/EU//RAMSSES
Keywords
Finite element method, Micro-crack formation, Residual stresses, Surface roughness
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Citation
Nafar 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 . https://doi.org/10.1016/j.jcsr.2020.106387