Abstract
The true stress-strain curve of a material should be determined for plastic property input to numerical analysis. This study proposes a simple methodology for determining the true stress-strain curve of SA-508 Grade 3 Class 1 low alloy steel using limited information from a general tensile test with finite element analysis. Measured engineering stresses and strains can be reasonably converted to true stresses and strains under uniform deformation before necking. True stress-strains are difficult to determine after necking because of nonuniform deformation without specialized measurement techniques. Five post-necking strain hardening models are considered, namely, linear, swift, Ludwick, Hollomon-linear (HL) and Hollomon-linear-constant (HLC) models. The equations for each model can be determined using the results of the tensile test, which include the true stress-strain value at the maximum load point and the corrected true stress-strain value at the fracture point plus the Considere instability criterion. The HL and HLC models suggested that the engineering stress-strains from the finite element analysis are consistent with the experimental results.
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This paper was presented at the 2016 KSME Annual Conference, Kangwonland Convention Center, Kangwon, Korea, December 14–16, 2016 and recommended by Associate Editor Jin Weon Kim
Hyeong Do Kweon is currently a Ph.D. candidate at Chungnam National University. He has been working for the Central Research Institute of KHNP as a Senior Researcher. His research interests include seismic design in nuclear power plants and vibration control of structures.
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Kweon, H.D., Heo, E.J., Lee, D.H. et al. A methodology for determining the true stress-strain curve of SA-508 low alloy steel from a tensile test with finite element analysis. J Mech Sci Technol 32, 3137–3143 (2018). https://doi.org/10.1007/s12206-018-0616-8
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DOI: https://doi.org/10.1007/s12206-018-0616-8