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Experimental Study on Evaluation of Fatigue Crack Growth Rate of Steel Plates using Crack Opening Displacement  

Kim, Kwang-Jin (부산대학교 사회환경시스템공학과)
Kim, In-Tae (부산대학교 사회환경시스템공학부)
Ryu, Yong-Yeol (부산대학교 사회환경시스템공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.22, no.6, 2010 , pp. 589-597 More about this Journal
Abstract
Steel structures have a higher probability of being damaged by fatigue than by other causes of deterioration. As such, their maintenance to prevent fatigue damage is essential to sustain their safety and performance during their service period. In their maintenance, the current state of their fatigue cracks must be assessed to determine appropriate reinforcement methods and the suitable time intervals of periodic inspections when fatigue cracks are detected. Determining the crack growth rate is a successful method of predicting fractures, but it requires technical knowledge on fracture mechanics and experience in numerical methods and software for finite element analysis. In this study, a fatigue crack growth test on through-thickness cracked steel plates was conducted to assess the crack growth rate without superior technical knowledge and experience. The relationship between the Crack Opening Displacement (COD) and the crack growth rate was found in relatively long fatigue cracks.
Keywords
fatigue crack; crack growth rate; COD(crack opening displacement); crack length; stress range; stress ratio;
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