Using dynamic loading at a K rate range of 102 to 105 MPa√m/s, fracture toughness tests were made on Type A508 Class 3 steel. Fatigue precracked 2T-type compact tension specimens were used. Tests were performed in accordance with Annex 7 of ASTM Test for Plane-Strain Fracture Toughness of Metallic Materials (E 399) using a high flow and high response tensile machine. In this investigation, load, strain, and displacement outputs were obtained with quite small oscillations. The results showed that dynamic fracture toughness values decreased with increasing test velocity and decreasing test temperature.
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