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정규화법을 이용한 원전배관 용접부의 동하중 파괴저항시험
허용(Yong Huh),조성근(Sung Keun Chop),박재실(Jae Sil Park),석창성(Chang Sung Seok) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The unloading compliance method is the most commonly used method to evaluate the fracture resistance characteristics of a material. In dynamic loading condition, the direct current potential drop(DCPD) method has been used because the unloading compliance method can not be applied due to the discontinuity of loading. However, even in the dynamic test using DCPD method, there is a problem that the voltage drops sharply on the initiation of crock. For the reason metioned above, the normalization method was suggested on ASTM E 1820 which is revised recently, as a new method to evaluate the dynamic fracture resistance characteristic. The nomalization method can be used to obtain a fracture resistance curve directly from a load-load line displacement. In this study, we obtained two fracture resistance curves from static test of welding part of nuclear piping both by unloading compliance and nomalization method. The two curves were almost some each other, so the adaptability of the nomalizotion method has been proved. We conducted a dynamic fracture resistance test for the some material. The fracture resistance curve from the dynamic test was obtained by normalization method and compared to that of the static test result.
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