The present paper proposes a robust method for the Ramberg-Osgood (R-O) fit to accurately estimate elastic-plastic J from the 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. The reliability of the proposed method for the R-O fit is validated against detailed three-dimensional FE analyses for 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 the 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.
On Relevant Ramberg-Osgood Fit to Engineering Nonlinear Fracture Mechanics Analysis
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division February 6, 2003; revision received July 18, 2003. Associate Editor: S. Rahman.
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Kim, Y., Huh , N., Kim, Y., Choi, Y., and Yang, J. (August 18, 2004). "On Relevant Ramberg-Osgood Fit to Engineering Nonlinear Fracture Mechanics Analysis ." ASME. J. Pressure Vessel Technol. August 2004; 126(3): 277–283. https://doi.org/10.1115/1.1760767
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