Effects of Specimen Thickness and Side-Groove on Fracture Toughness of JN1 Austenitic Stainless Steel Rolled Plate at Liquid Helium Temperature
In order to evaluate the fracture toughness (J IC ) of JN1 austenitic stainless steel rolled plate, we performed elastic-plastic fracture toughness tests with standard and modified compact tension specimens at liquid helium temperature. These tests were conducted in accordance with ASTM standards E813–81 and E813–87 for determining J IC using the unloading compliance method to monitor crack growth. The effects of specimen thickness and side-groove on J IC and tearing modulus (T mat ) are reported. The final value of physical crack extension was taken as the average of nine measurements using an optical microscope. Fracture surfaces were examined by scanning electron microscopy (SEM) to verify the failure mechanisms. The effects of crack tunneling on the determination of J-integral resistance curves and valid J IC values, and a difference between ASTM standards E813–81 and E813–87 are also discussed.
KeywordsAustenitic Stainless Steel Crack Front Crack Extension Specimen Thickness Compact Tension Specimen
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