http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
USC 발전소용 12 Cr 계 마르텐사이트강의 저주기피로특성
김국철(Kim Kuk-Cheol),석진익(Suk Jin-Ik),김병훈(Kim Byung-Hoon),김정태(Kim Jeong-Tae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The objective of this study is to investigate the characteristics of low cycle fatigue for the candidate bucket material (DS2B2) developed by Doosan. Turbine bucket is subjected to the repeated thermal stress during shutdown and heat-up. Therefore, LCF characteristics is of much concern in order to meet the fatigue life requirement. At room and service temperature of 593℃, LCF test were carried out for DS2B2 and commercial materials COST B2. Both DS2B2 and COST B2 materials were refined by VIM and ESR process. DS2B2 material was more superior to COST B2 for LCF life. The LCF characteristics of DS2B2 materials manufactured by VIM and ESR processes was improved as compared with that by VIM process. It can be seen that the harmful element S and non-metallic inclusions were reduced and the grain size was finer through the ESR refining process.
X-FEM을 이용한 원자력발전 소재의 J-R 산출 방법에 관한 연구
장윤찬(Jang Yun-Chan),정성호(Chung Sung-Ho),이재업(Lee Jae-Eob),김국철(Kim Kuk-Cheol),김형남(Kim Hyung-Nam) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Since the mid-1980s, the LBB design concept has been widely applied on nuclear high energy piping systems. For LBB design, material properties for stress-strain curves and J-R curves as a function of resistance to stable crack extension at service temperatures are needed. In this study, fracture toughness test and numerical studies were performed to calculate J-R curve characteristic of carbon steel and stainless steel for reactor coolant piping. Test temperature was 316 0C; same as the operating temperature of the piping system. A series of three-dimensional FE analysis which simulates the fracture toughness test and crack propagation are carried out as well. The calculated J-R curves were in good agreement with the test results.