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Trummer, Gerald
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document
REPRESENTATION OF MICROSTRUCTURE FOR FATIGUE CRACK GROWTH IN DEM SIMULATIONS
Abstract
Short crack and fatigue behavior of pearlitic steels in wheel-rail contact depends on the microstructure. In this work, a hierarchical meshing methodology is proposed to describe microstructural details including grain/colony boundaries and lamellae orientations. The Voronoi Tessellation method was used to generate elements with the same average and standard deviation values for grain/colony areas. The area distribution of fully pearlitic steel was taken from SEM and EBSD measurements of R260 to construct a mesh that represents the microstructure. This meshing method is the first step for modeling fatigue crack growth anisotropy due to plastic deformation which can be geometrically implemented in the model.