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http://dx.doi.org/10.20466/KPVP.2016.12.2.034

Quantification of R-ratio effect on J-integral under large-amplitude cyclic loading condition  

Nam, Hyun Suk (고려대학교 기계공학부)
Kim, Yun Jae (고려대 기계공학부)
Kim, Jin Weon (조선대학교 원자력공학과)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.12, no.2, 2016 , pp. 34-39 More about this Journal
Abstract
This paper presents a method to quantify R-ratio effect on J-integral under large-amplitude cyclic loading condition. Generally, monotonic tearing resistance curves are used to assess stability of cracked nuclear piping under seismic loading. However, it is well known that fracture toughness decrease at cyclic loading condition, according to R-ratio. For this reason, it is important to quantify the J-R curves under cyclic loading condition. To quantify the R-ratio effect, correction method which was proposed by Tranchand is considered. This method considers crack opening area in order to calculate modified J-integral. This method leads to an increase of fracture toughness. At R=-0.5 case, this method is good agreement with monotonic J-R curves. However, results show that this method has a limit to apply a large R-ratio case.
Keywords
Cyclic loading condition; Fracture toughness test; R-ratio; FE analysis;
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