It is essential to determine true stress-strain curve of a material for plastic properties input to a numerical analysis. A simple methodology for determining the true stress-strain curve of SA-508 Grade 3 Class 1 low alloy steel using limited informa...
It is essential to determine true stress-strain curve of a material for plastic properties input to a numerical analysis. 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 is proposed in this paper. Before necking, it is reasonable to simply convert measured engineering stress-strains to true stress-strains under uniform deformation. After necking, it is difficult to know true stress-strains due to nonuniform deformation without any specialized measurement techniques. Five post-necking strain hardening models are taken into account, which are Linear, Swift, Ludwick, Hollomon-Linear, and Hollomon-Linear-Constant equations. The equations can be decided using tensile test results that are true stress-strain value at the maximum load point, corrected true stress-strain value at the fracture point, and Considere Instability Condition. Hollomon-Linear and Hollomon-Linear-Constant models showed that the engineering stress-strains resulted from the finite element analysis best agree with the experimental results.