Effect of stress ratios on corrosion fatigue life of high‐strength steel wires

Abstract

In order to discuss the influence of the stress ratio on the corrosion fatigue life of high‐strength steel wires, a theoretical and experimental investigation was conducted on corroded steel wires at three different stress ratios (R = 0.1, 0.3, and 0.5) under axial tensile fatigue loading. Different S‐N curves of corroded steel wires were regressed from test data. The stress method based on eight mean stress correction models, the strain energy method, and the facture mechanics method considering environmental corrosion and crack closure were proposed to estimate the fatigue life. Preliminary results show that corrosion can reduce the ultimate strength, the yield strength, and the fatigue life. There is a negative correlation between corrosion fatigue life and stress ratio. When R > 0, fatigue life predicted results by using the Morrow and Marin models in the stress method are more efficient and accurate than other models. Likewise, the Zheng model in the fracture mechanics method is in better agreement with test results. The error and scatter of the strain energy method are relatively large. Therefore, the Morrow, Marin, and Zheng models are more suitable to predict the corrosion fatigue life of high‐strength steel wires under different stress ratios.

Corrosion fatigue mechanisms and evaluation methods of high‐strength steel wires: A state‐of‐the‐art review

“…Zhang et al 62 indicate that higher pre-stress levels correlate with increased corrosion rates in stay cable high-strength steel wires, intensifying the corrosion probability. Jie et al 63 conducted a comprehensive study examining corroded steel wires under axial tensile fatigue loading at various stress ratios. Their regression analysis of S-N curves displayed a significant inverse correlation between corrosion fatigue life and stress ratio.…”

Fatigue Crack Propagation of Corroded High-Strength Steel Wires Using the XFEM and the EIFS

“…The chemical composition of high-strength steel wires can be found in ref. [ 23 ]. The steel wire with a pit had a diameter of 7 mm and a length of 500 mm, as shown in Figure 3 .…”

“…[ 24 ]. For round steel wires with an elliptical crack subjected to axial tensile loading, the crack shape correction factor Y was written as [ 23 ]: …”