The effect of loading rate and temperature on fracture initiation in 1020 hot-rolled steel

Abstract Fracture initiation experiments were conducted to determine the fracture toughness of an AISI 1020 hot-rolled steel under quasi-static and dynamic loading conditions. The dynamic tests were performed on specimens consisting of notched round bars loaded in tension by means of a stress pulse, thus giving an effective value of /.K I = 2 · 10 6 ksi √in. s −1 (2.2 · 10 6 MPa √m s −1 ) . The tests were conducted over the temperature range −157 to 121°C, and results are compared to those obtained in quasi-static tests with like specimens. Parallel tests were conducted to determine static and dynamic flow stresses of the material over the temperature range. Finally, a comparison is made with the behavior of an AISI 1018 cold-rolled steel previously tested in the same apparatus.

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