On fracture locus of corroded steel plates with nominal fracture strain and corrosion morphology

Abstract

In order to study the fracture ductility of corroded steel plates under tension load, a series of tensile tests and numerical calculations on corroded steel plates were conducted. The results showed that corrosion damage would increase the speed of equivalent plastic strain growing at critical point, and decrease the equivalent plastic strain to fracture, thus degrade the nominal strain at fracture. The weakened and uneven cross-section along longitudinal direction caused by corrosion damage led to the strain concentration and accelerated growth of equivalent plastic strain. The corrosion pits increased the values of stress triaxiality and Lode stress parameter, thus degenerated the equivalent plastic strain to fracture. Based on the above results, the fracture locus of corroded steel plates in the nominal strain to fracture-corroded morphology space was established.