A Study on the J-Resistance Characteristics and Material Tearing Modulus of SG365 steel

J. Ocean Eng. Technol. 2001;15(3):75-80.

SG365강의 파괴저항특성과 찢어짐계수에 관한 연구

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동의대학교 산업기술개발연구소,동의대학교 기계공학과

Keywords: Material tearing modulus, Effect of side grooved, J-Resistance curve, Single specimen unloading compliance method, Gas piping material, J-integral, Unstable crack growth

핵심용어: 재료찢어짐계수, 측면홈 효과, 파괴저항곡선, 단일시험편 해중법, 가스배관재, J적분, 불안정균열성장

Abstract

The elastic plastic fracture toughness of this material is evaluated by the an unloading compliance method according to the ASTM E813-97 and E1152-97 method on the smooth and side groove 1CT specimens. The effect of smooth and side groove is studied on the material tearing modulus and characterizes the crack tip field under the plane stress and strain. SG-365 steel is observed that J-R curve and Tmat value decrease as 0%, 20%, 30%, and 40%. The 40% 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 the them and tunneling and shear lip by the side groove. Applicability of tearing modulus($T_J$ proposed by paris et al as instability panameter for this material is investigated.