An accurate modelling of the material true stress-true strain relationship up to the instant of fracture is required in carrying out finite element analyses of structural connections and in regions of geometric discontinuity. In a standard tension material test of steel, the measurement of the axial deformation of the gauge length versus the load only allows the material true stress-true strain relationship to be calculated up to the peak load. This paper will present the experimental and finite element study of the A516 pressure vessel steel and X70 pipeline steel tension coupon tests, and recommend a simple procedure to obtain an approximate true stress-true strain relationship using the combination pre-peak load axial deformation-load relationship and the post-peak load transverse deformation-load relationship from a standard tension material test. Both cylindrical and rectangular coupons were investigated in this study. Axial deformation-load measurement after reaching the peak load varies significantly between specimens of the same material and dimension, but not the transverse deformation-load relationship.

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Conference Canadian Society for Civil Engineering - 30th Annual Conference: 2002 Chellenges Ahead
Citation
Khoo, H. A, Cheng, J.J.R., & Hrudey, T.M. (2002). Determine steel properties for large strain from a standard tension test. Presented at the Canadian Society for Civil Engineering - 30th Annual Conference: 2002 Chellenges Ahead.