A study on the Relations Between Fracture Strain and Fracture Resistance Curve of nuclear Pressure Vessel Steel

J. Ocean Eng. Technol. 2000;14(1):44-51.

압력용기강의 파괴저항곡선의 파괴변형률에 관한 연구

임만배

동아대 생산기술연구소

Keywords: Local fracture strain, Fracture resistance curve, Material tearing modulus, Stretch zone width, Strain hardening

핵심용어: 국부파괴변형률, 파괴저항곡선, 재료의 찢어 짐계수, 스트레스존폭, 가공경화

Abstract

Safety and integrity are required for reactor pressure vessels because they are operated in high temperature. There are single specimen method multiple specimen method and load ratio analysis method which used as evaluation of safety and integrity for reactor pressure vessels. In this study the fracture resistance curve(J-R curve) elastic-plastic fracture toughness($J_{IC}$) and material tearing modulus ($T_{mat}$) of SA 508 class 3 alloy steel used as reactor pressure vessel steel are measured and evaluated at room temperature 20$0^{circ}C$ and 30$0^{circ}C$ according to unloading compliance method and load ration analysis method. And then the comparison with experimental $J_{IC}$ and theoretical$J_{IC}$ by local fracture strain is managed.