Abstract
The paper takes the corrosion fatigue damage of cable or sling in the actual bridge as a starting point. The high-strength steel wire is chosen as the basic component to study the corrosion fatigue failure mode. The service life prediction model is put forward, which provides a basis for future research. In this paper, the S-N curves of the steel wire with the different corrosion degrees are given through fatigue tests of six groups of steel wire under different corrosion conditions. The results show that the higher the corrosion degree, the steeper the S-N curve, and the fatigue life considering corrosion are much lower than that without considering corrosion. Finally, a fatigue life prediction model considering the coupling effect of corrosion fatigue is proposed and embedded into Abaqus v6.14 (Dassault, Paris, French). The calculation results show that the fatigue model considering the corrosion can predict the service life to some extent.
Highlights
Bridge is one of the important projects in infrastructure construction, and its damage may cause serious consequences
As the basic component of the sling, high-strength steel wire provides a basis for studying the failure mode of the sling by studying its fatigue characteristics [4]
The results show that the failure stress of steel wire is much lower than its ultimate strength because of the influence of alternating loads
Summary
Bridge is one of the important projects in infrastructure construction, and its damage may cause serious consequences. The sling is a member of a suspension bridge that is prone to fatigue failure [3]. The results show that the failure stress of steel wire is much lower than its ultimate strength because of the influence of alternating loads. Corrosion can reduce the stress range to failure under a certain number of load cycles and reduce the fatigue strength of steel and other structures [9,11]. Paolo et al conducted the influence of corrosion morphology on the fatigue strength of bolted joints [15]. There is little research on the influence of corrosion fatigue coupling effect on the steel wire at present [21]. How corrosion fatigue of steel wire affects each other is an urgent problem to be solved. The novelty of the research is that the random corrosion model and corrosion fatigue constitutive model of steel wire were established through secondary development, and the influence of corrosion on steel wire fatigue was studied
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