Abstract
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 (4δt, σ22c) criterion applies to 16MnDR steel and effectively transfers the minimum Jc value between samples of different temperatures and thickness.
Highlights
Ferritic steel such as the 16MnDR is a widely used alloy in industrial production for making cryogenic pressure vessels
Because the 16MnDR ferritic steel has low strength and good plastic properties, it cannot be analyzed based on the traditional linear elastic fracture theory
The measurement of fracture toughness of the steel has a high degree of uncertainty for the designers and the manufacturers of the cryogenic pressure vessels[1]
Summary
Ferritic steel such as the 16MnDR is a widely used alloy in industrial production for making cryogenic pressure vessels. The measurement of fracture toughness of the steel has a high degree of uncertainty for the designers and the manufacturers of the cryogenic pressure vessels[1]. In order to qualitatively study this minimum, Meshii T. et al proved the existence of this minimum using the (4δt, σ22c) local fracture criterion and gave a specific method to determine this minimum[5]. The (4δt, σ22c) criterion was used in the present study to predict the minimum failure conditions of 16MnDR steel. The applicability of the criterion has been verified by fracture toughness data alongside the finite element method under different conditions, i.e., temperature and thickness of the sample
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