Transformation of fracture resistance curves by using bending modified Q (Qm) factor
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- 作者：Tao Shen ; Keontae Park ; Jaegu Choi…
- 关键词：Full scale pipe ; J ; R curve ; J ; Q theory ; Crack ; opening stress
- 刊名：International Journal of Precision Engineering and Manufacturing
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：18
- 期：1
- 页码：85-91
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Industrial and Production Engineering; Materials Science, general;
- 出版者：Korean Society for Precision Engineering
- ISSN：2005-4602
- 卷排序：18
文摘
The application of the leak-before-break (LBB) concept to design and assess piping systems for nuclear power plants requires fracture resistance curves (J-R curves) of cracked full scale pipes. However, it is expensive and difficult to perform full scale pipe tests. Laboratory test specimens with smaller geometry size were used to obtain the J-R curves for full scale pipes, but as both the specimen geometry and loading configuration have a strong effect on J-R curves, it is difficult to predict the J-R curves of full scale pipes accurately from laboratory test specimens. In this study, based on the bending modified Q (Qm) factor, and the J-R curves of compact tension (CT) specimens and curved wide plate (CWP) specimens, constraint corrected J-R curves of the stainless steel SA-312 TP304L were obtained, which were used to predict the J-R curves of full scale pipes. The predictions show good agreement with full scale pipe test results within the specific crack growth range.