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Based on the finite element analysis and fracture toughness test data, this paper verifies the improved Ritchie-Knott-Rice (RKR) local failure criterion using 16MnDR ferritic steel for cryogenic pressure vessels. This criterion's applicability to 16MnDR was verified to verify fracture toughness's different influence factors in the ductile-to-brittle transition temperature (DBTT) region, such as specimen thickness (TST) and temperature. The results indicate that the (4δ  t  , σ  22c  ) criterion applies to 16MnDR steel and effectively transfers the minimum  J c value between samples of different temperatures and thickness.

Performance of ferritic steel 16MnDR using improved local fracture criterion