Abstract
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.
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