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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2022.5
- 수록면
- 1,570 - 1,578 (9page)
- DOI
- https://doi.org/10.1016/j.net.2021.11.005
이용수
초록· 키워드
오류제보하기
During a severe accident, steam generator (SG) tubes undergo rapid changes in the pressure and temperature. Therefore, an appropriate creep model to predict a short term creep damage is essential. In thispaper, a novel creep model for Alloy 690 SG tube material was proposed. It is based on the theta (q)projection method that can represent all three stages of the creep process. The original q projectionmethod poses a limitation owing to its inability to represent experimental creep curves for SG tubematerials for a large strain rate in the tertiary creep region. Therefore, a new modified q projectionmethod is proposed; subsequently, a master curve for Alloy 690 SG material is also proposed to optimizethe creep model parameters, qi (i ¼ 1e5). To adapt the implicit creep scheme to the finite element code, apartial derivative of incremental creep with respect to the stress is necessary. Accordingly, creep modelparameters with a strictly linear relationship with the stress and temperature were proposed. Theeffectiveness of the model was validated using a commercial finite element analysis software. The creepmodel can be applied to evaluate the creep rupture behavior of SG tubes in nuclear power plants
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