| Welding is one of the main connection mode of modern architecture steel structure, in a variety of environment, the steel structure inevitably exists corrosion phenomenon, weld also exists corrosion phenomenon, resulting the connection performance of steel structure changed.Paper through Q235 B steel butt weld specimen under atmospheric exposure salt spray corrosion, with the three-dimensional non-contact surface topography instrument to study corroded butt weld surface morphology in different corrosion time, compare surface topography of parent metal area,heat affected zone and weld area of butt weld specimen in different corrosion time, estimate the characteristic parameters of the specimen surface topography, established the relationship between surface morphology parameters of parent metal area, heat affected zone of corroded butt weld specimen with the average corrosion rate.Experimental study on tensile properties of corrosion of butt weld and corroded steel, discussed tensile properties of butt weld and steel with corrosion, established the relationship between yield strength?ultimate strength and elongation with the average corrosion rate, used Ramberg- Osgood model on stress- strain curve of corrosion of butt weld specimen to fit analysis, and established the constitutive model of corroded butt weld.Paper with the finite element software ABAQUS, using flexible damage model to analyze butt weld damage fracture based on the triaxial stress theory, study on corrosion pit of the butt weld about stress triaxial distribution, explain corrosion pit influence on the ductile crack initiation, crack propagation of butt weld specimen,disscuss the relationship between corrosion pit depth ratio or the depth with butt weldspecimen internal triaxial stress degree. |
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