Effect of Side Groove on the Elastic Plastic Fracture Toughness of Gas Piping Material

J. Ocean Eng. Technol. 2001;15(3):63-68.

가스배관재의 탄소성파괴인성에 미치는 측면홈 영향

임만배,차귀준,윤한기,공유식,김정호

동의대학교 산기연,동명대학 가스냉동과,동의대학교 기계공학과,동의대학교 기계공학과,동의공고 기계과

Keywords: Elastic plastic fracture toughness, Side grooved, J-R curve, Single specimen unloading compliance method, Gas piping material, J-integral, Crack length

핵심용어: 탄소성파괴인성, 측면홈, 파괴저항곡선, 단일시험편 해중법, 가스배관재, J 적분, 균열길이

Abstract

SG-365 steel is an important material and used for manufacturing a pressure vessel which the gas piping. In this investigation, the elastic plastic fracture toughness of this material is evaluated by the an unloading compliance method according to the ATM E813-97 method on the smooth and side groove 1CT specimens. The effect of smooth and side groove is studied on the elastic plastic fracture toughness. The side grooved specimen is very useful in estimation of the $J_IC. Because it is much easier than the smooth specimen to the onset of the ductile tearing by the R curve method. Besides, it improves the accuracy of toughness values, decreases the scattering of them and tunneling and shear lip by the side groove.