Mechanism analysis of degradation of mechanical properties in corroded steel bars based on numerical investigation

摘要

This study numerically investigates the effects of corrosion pits on the mechanical degradation of corroded steel bars. The yield plateau for typical load-displacement curves in corroded steel bars decreased, eventually disappearing, while the tensile strength and maximum elongation of corroded steel bars gradually decreased as pit depth's corrosion increased. In a semielliptical cross-section corrosion groove, the failure energy of corroded steel bars was at its highest point when the ratio of the section width and depth were between 1 and 2. The degradation mechanisms regarding the mechanical properties of corroded steel bars were analyzed based on the stress and strain of three-dimensional distributions around the corrosion pit. This work found that stress and strain concentrations were the primary reason for degradation in the mechanical properties. This work proposes a mechanical property degradation model of corroded steel bars based on the energy principle.