Mechanical and Surface Geometric Properties of Reinforcing Bars and Their Significance for the Development of Near-Surface Notch Stresses

Due to the production process, reinforcing steel bars possess an inhomogeneous microstructure associated with different material properties over cross-section (e.g., hardness, ductility or strength). Furthermore, surface required for bond has a negative effect on fatigue behavior. The first investigations were carried out in 1970s and detected fillet radius r as key influencing factor. Until now, few studies had been that investigate quantification of behavior, none them compared these local strengths material. current paper presents results reverse-engineered bar based previously performed laser scanning process. rebar models used calculate notch stress factors diameters von Mises stresses taken from FEM simulations. showed functional relationship radius, which was already shown literature. Further experimental tensile behavior structural components investigated Tempcore® rebars specimens eroded by WEDM. tests derive yield strength distribution cross-section. Depending microstructure, between 415 N/mm2 (ferrite/pearlite core) 690 (tempered martensite surface) found. acting show logarithmic dependency but do not reach surface.