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ChangJong Kim(김창종),JongSung Kim(김종성),HyunSu Jang(장현수),YungChan Kim(김영찬) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, Irradiation-assisted stress corrosion cracking (IASCC) growth analysis was performed through welding residual stress and neutron irradiation analysis of Core Shroud, one of the reactor internal structure. There has not been sufficient research to predict IASCC growth behavior for neutron irradiation, temperature and thermodynamic treatment of reactor internal structure. Therefore, it is important to predict the IASCC growth behavior of the core shroud because there are many welds in the core shroud, one of the reactor internal structures, and it is operated under high temperature and neutron irradiation environment. In the previous study, after residual stress analysis, neutron irradiation and IASCC sensitivity analysis were performed. Through the analysis results, two maximum sensitivity points at 20, 30, and 40 EFPY with IASCC sensitivity of 0.5 or higher were selected as cracks initiation points. All cracks were found in the weld. The growth direction of cracks in the weld was determined according to the direction of the principal stress by deriving the principal stress at the point where the maximum IASCC sensitivity occurred. The IASCC finite element growth analysis results will present the energy release rate according to the crack location.
김창종(ChangJong Kim),조성민(Sung Min Cho),김은정(Eun Jung Kim),윤기봉(Kee Bong Yoon) 한국가스학회 2013 한국가스학회지 Vol.17 No.3
본 연구에서는 수압파열시험 장비를 이용하여 Type3 복합용기의 설계 파열압력에 관한 실증연구를 수행하였다. 고압가스를 저장할 수 있는 6.8L급 사용압 31㎫ Type3 복합용기에 대한 유한요소 설계해석을 통하여 파열압을 예측하였고 해석의 정확성을 확인하기 위하여 수압파열시험을 3회 실시하였다. 파열시험설비는 수압으로 최대 400㎫까지 가압이 가능한 장비를 활용하였다. 해석으로 예측된 소형 복합용기의 설계 파열압과 실제 파열시험 결과를 비교한 결과, 값의 차이는 4% 이내로 나타났다. 이를 통하여 해석기법의 신뢰성을 확인하였으며, 본 실증에서 검증된 해석기법을 복합용기의 안전성 확보를 위한 국내인증 및 제품검사에 적용할 예정이다. In this research, an empirical study on the designed burst pressure of Type3 composite cylinder was performed by hydrostatic burst test equipment. The designed burst pressure of Type3 composite cylinders, which are 6.8 liter and 31 ㎫ of service pressure, was estimated with the analysis using the finite element method. In order to confirm its accuracy, the burst test of small Type3 composite cylinders was perfomed through three times. The burst test equipment can pressurize to 400 ㎫. As a result of comparison between the designed burst pressure and actual burst pressure, the difference was less than 4 percentage. With a test result, the analysis accuracy was verified. This technique will be applied to both qualification and inspection for the composite cylinder.