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http://dx.doi.org/10.3795/KSME-A.2003.27.9.1571

On Relevant Ramberg-Osgood Fit to Engineering Non-Linear Fracture Mechanics Analysis  

Huh, Nam-Su (성균관대학교 기계공학부)
Kim, Yun-Jae (성균관대학교 기계공학부)
Choi, Young-Hwan (한국원자력안전기술원)
Yang, Jun-Seok (한국전력공사 전력연구원)
Kim, Young-Jin (성균관대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.27, no.9, 2003 , pp. 1571-1578 More about this Journal
Abstract
This paper proposes a robust method for the Ramberg-Osgood(R-O)fit to accurately estimate elastic-plastic J from engineering fracture mechanics analysis based on deformation plasticity. The proposal is based on engineering stress-strain data to determine the R-O parameters, instead of true stress-strain data. Moreover, for practical applications, the method is given not only for the case when full stress-strain data are available but also for the case when only yield and tensile strengths are available. Reliability of the proposed method for the R-O fit is validated against detailed 3-D Finite Element (FE) analyses for circumferential through-wall cracked pipes under global bending using five different materials, three stainless steels and two ferritic steels. Taking the FE J results based on incremental plasticity using actual stress-strain data as reference, the FE J results based on deformation plasticity using various R-O fits are compared with reference J values. Comparisons show that the proposed R-O fit provides more accurate J values for all cases, compared to existing methods for the R-O fit. Advantages of the proposed R-O fit in practical applications are discussed, together with its accuracy.
Keywords
Crack Opening Displacement; Leak-Before-Break; J-Integral; Circumferential Through-Wall Crack;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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