Fracture toughness evaluation for dissimilar steel joints by Charpy impact test
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The influence of strength mismatch in a dissimilar steel joint on the Charpy absorbed energy was numerically analyzed on the basis of the Beremin model. The toughness correction ratio γCVN was defined as the ratio of the Charpy absorbed energy of a dissimilar steel joint specimen to that of a homogeneous specimen under the same Weibull stress. The Charpy test results for a clad joint of dissimilar steels were characterized using γCVN. A fracture toughness evaluation method was developed from the Charpy data for dissimilar steel joints considering γCVN. The fracture toughness at temperature T was predicted according to ASTM E1921 and BS 7910:2015 standards using the 27 J transition temperature T27J determined from the estimated Charpy transition curve. The predicted KJc transition curve showed reasonable agreement with the experimental results.
KeywordsFracture toughness Impact toughness Dissimilar joints Mismatch
This work was supported by JSPS KAKENHI (grant number JP17K14822) and financially supported by Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia, Osaka University of Special Budget Project of the Ministry of Education, Culture, Sports, Science and Technology.
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