Improved J and COD estimation equations covering long circumferential through-wall cracks in pipes: I-bending

초록

For LBB analysis of small-diameter piping in small modular reactors, elastic-plastic J and COD needs to be estimated potentially for long circumferential through-wall cracks larger than 50 % of the circumference. This paper proposes improved J and COD estimation equations for circumferential thorough-wall cracked pipes in bending, covering short-to-long cracks over 50 % of the circumference. The proposed equations are based on extensive FE analysis. Comparisons with FE J and COD results confirmed that the proposed equations improves the accuracy of estimated J and COD not only for short cracks but also for long cracks, compared to existing estimation equations.

키워드