| Title |
A Study on the Dynamic fracture toughness of Structural Steels by Instrumented Impact Testing (6) ( on the Crack Tip Behaviour in Estimating Fracture toughness ) |
| Authors |
김창열(Chang Ryul Kim); 김헌주(Heon Joo Kim); 조순형(Soon Hyung Cho); 김기철(Ki Chol Kim); 윤의박(Eui Park Yoon) |
| Abstract |
Dynamic fracture toughness of welding structural steel including it`s weld zone has been estimated by employing instrumented impact testing method for small size specimens. Result showed that dynamic fracture toughness, K_(ID) was increased in the order of HAZ 4㎜, HAZ 6㎜, HAZ 1㎜, HAZ 2㎜, fusion line. Correlations between Charpy absorbed energy and critical COD have been investigated to get a useful method for the estimation of critical COD from Charpy V data. The correlations between vE(T+△T) and fe were taken into a consideration where vE(T + oT) is Charpy absorbed energy obtained by considering temperature difference between Charpy transition temperature and COD transition temperature. It was found that the correlations were establised over a wide temperature range including not only upper shelf range but also transition range. |