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Vol.27, No.8, 691 ~ 698, 1989
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| Title |
| A Study on the Dynamic Fracture toughness of Structural Steels by Instrumented Impact Testing (4) |
| 윤의박Eui Pak Yoon, 김기철Ki Chol Kim, 김주학Joo Hag Kim, 김헌주Heon Joo Kim, 조순형Soo Hyung Cho |
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| Abstract |
| The relationships between the microstructure and dynamic fracture toughness, kid, were mainly investigated. In order to measure a fracture toughness using instrumented impact test, the necessity of low b1ow test for obtaining true energy by the compliance correction and Equivalent energy method were confirmed. It was proven that 2nd pass performance was capable of enhancing bond toughness. K_(Id) value decreased abruptly with increasing 1st pass heat input from 2.5KJ/㎜ to 9.0KJ/㎜. Bond toughness, however, improved noticeably when 2nd pass was carried, the heat input of which was between 2.5KJ/㎜ and 4.5KJ/㎜. |
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