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contributor authorWenjing Qiao
contributor authorHao Zhang
contributor authorFan Yang
contributor authorZhiguo Liu
date accessioned2022-12-27T20:41:03Z
date available2022-12-27T20:41:03Z
date issued2022/11/01
identifier other(ASCE)MT.1943-5533.0004427.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4287799
description abstractThis paper investigated stress flow in weathering steel Q345 after strong acid corrosion. In total, 27 specimens were immersed in 36% industrial hydrochloric acid for 0, 1, 2, 4, 8, 12, 24, 48, and 72 h, respectively. A three-dimensional noncontact laser scanner was used to measure geometric parameters of pits on the surface of the steel. The influence on ductile crack initiation in steel under the pit was investigated through tensile testing and finite-element simulation, which obtained the relationship among depth-diameter ratio, depth ratio, and stress triaxiality. Based on analysis of 65 finite-element models, the equivalent ductile fracture criterion of strong-corrosion steel per corrosion times was proposed. The results showed that the depth-to-diameter ratio of pits increased linearly with pit depth, whereas the depth ratio of pits increased nonlinearly with corrosion time extending. After 24 h of corrosion, the depth ratio of pits in weathering steel Q345 showed an inflection point where the growth rate was relatively slow. When corrosion time reached 72 h, the depth-diameter ratio and depth ratio of the maximum pit was 0.74 and 0.01, respectively. With the development of the depth-to-diameter ratio, the stress triaxiality inside corrosion steel increased; meanwhile, the equivalent plastic fracture strain decreased, which accelerated internal crack initiation. For pits in weathering steel Q345 with a depth-diameter ratio of 0.40–0.80, stress triaxiality increased from 0.56 to 1.23. Finally, the elongation of corrosion steel degraded gradually. By comparing test values, formula values, and finite-element values, fracture strain errors were all less than 5%. These data show that the equivalent ductile fracture criterion can accurately simulate the ductile degradation in weathering steel Q345 after hydrochloric-acid corrosion. The research results can provide a theoretical basis and application reference for strong-corrosion protection ways of weathering steel Q345 after hydrochloric-acid corrosion.
publisherASCE
titleDuctility Degradation of Weathering Steel Q345 after Exposure to Hydrochloric-Acid Corrosion Dependent on Pitting Damage
typeJournal Article
journal volume34
journal issue11
journal titleJournal of Materials in Civil Engineering
identifier doi10.1061/(ASCE)MT.1943-5533.0004427
journal fristpage04022304
journal lastpage04022304_13
page13
treeJournal of Materials in Civil Engineering:;2022:;Volume ( 034 ):;issue: 011
contenttypeFulltext


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