Journal
ADVANCED STEEL CONSTRUCTION
Volume 17, Issue 1, Pages 20-27Publisher
HONG KONG INST STEEL CONSTRUCTION
DOI: 10.18057/IJASC.2021.17.1.3
Keywords
Inclined cruciform joints; Corrosion pits; Hot spot stress concentration factor; Fatigue notch factor; Fatigue life
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Funding
- National Natural Science Foundation of China [51708305]
- Zhejiang Provincial Natural Science Foundation of China [LQ17E080005]
- Open Foundation of State Key Laboratory Cultivation Base of Mountain Bridge and Tunnel Engineering [CQSLBF-Y17-1]
- K. C. Wong Magna Fund in Ningbo University
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Experimental and numerical investigations were conducted on the fatigue properties of inclined corroded cruciform joints, revealing that pitting corrosion damage reduces fatigue strength. However, specimens without and with smaller corrosion pits exhibited similar fatigue strengths. Pit depth and radius are the main parameters affecting the relative hot spot stress concentration factors.
Experimental and numerical investigations on the fatigue properties of inclined corroded cruciform joints were conducted in this paper. Two artificial hemispherical notches were used to simulate pitting corrosion damage. Fatigue tests were carried out under uniaxial tensile cyclic loading. The fatigue S-N curves considering different types of corrosion damage were fitted by regression analysis. A relative hot spot stress concentration factor (HSSCF) concept was proposed. The influence of the pit size on the relative HSSCF of the cruciform joints was analyzed based on a numerical analysis. The fatigue notch factor (FNF), which considered the effect of corrosion pits, was used to describe the fatigue strength reduction. The FNF method and the Theory of Critical Distances (TCD) were employed to predict the fatigue life of corroded cruciform joints. It is concluded that pitting corrosion damage reduces the fatigue strength, but specimens without and with smaller corrosion pits exhibited similar fatigue strengths at 2 million cycles. The pit depth and radius are the main parameters affecting the relative HSSCFs, and an equation as a function of the pit depth and radius is obtained. The predicted S-N equations correlate well with the experimental results. The maximum error of the fatigue life calculation results based on these two methods is only -27.8%. They can be used to predict the fatigue life of corroded cruciform joints. Copyright (C) 2021 by The Hong Kong Institute of Steel Construction. All rights reserved.
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