INFLUENCE OF SURFACE ROUGHNESS ON DUCTILITY OF CORRODED STEEL: AN EXPERIMENTAL STUDY
Naftary GATHIMBA1* and Yasuo KITANE1
1Department of Civil and Environmental Engineering, Nagoya University, Nagoya, Japan
This paper presents results of an experimental investigation on the variation of ductility with changing surface roughness due to corrosion. Tensile coupons were prepared from a naturally corroded railway bridge girder that had been in use for 77 years as well as from artificially corroded steel plates. The coupons were tested experimentally under monotonically increasing axial load. In addition, various surface roughness parameters for these coupons were determined as specified in ISO 25178-2. Results show that static ductility is influenced by the height and hybrid characteristics of the corroded steel surface. In general, ductility decreases as surface height roughness parameters increase. The mechanism of ductility decrease is attributable to stress concentration and strain localization due to surface unevenness.
Corrosion; Ductility; Surface roughness; Stress concentration; Strain localization