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The R-curve behavior of A572 Grade 50 steel was established over the temperature range -40 to +72 F by using state-of-the-art procedures. Both linear-elastic-fracture-mechanics (LEFM) and crackopening- stretch (COS) analytical techniques were used in assessing experimental results obtained under load-control and displacementcontrol testing conditions. This study represents a pioneer effort in that it is the first known attempt to evaluate the R-curve behavior of a low-strength structural steel in some depth.