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Korean Journal of Metals and Materials > Volume 55(2); 2017 > Article
Korean Journal of Metals and Materials 2017;55(2): 85-90. doi: https://doi.org/10.3365/KJMM.2017.55.2.85
역사이클 하중의 증분변위가 원전배관 재질의 파괴저항곡선에 미치는 영향
김상영
군산대학교 기계자동차조선해양공학부
Effect of Incremental Displacement on the Fracture Resistance Curve of Nuclear Piping Materials under Reverse Cyclic Loading
Sang-Young Kim
Kunsan National University, School of Mechanical, Automotive, Naval Architecture And Ocean Engineering, Gunsan 54150, Republic of Korea
Correspondence  Sang-Young Kim ,Tel: +82-63-469-4873, Email: sangyoungkim@kunsan.ac.kr
Received: 4 May 2016;  Accepted: 30 August 2016.  Published online: 2 February 2017.
ABSTRACT
Reverse cyclic loading introduces alternatinf tensile and compressive loads to a structure. Several researchers have reported that a reverse cyclic load decreases the fracture resistance curve of carbon steel. In this paper, the fracture toughness of SA312 TP304 stainless steel, which is a nuclear piping material, was investigated under a reverse cyclic load with various incremental plastic displacements. From the test results, the incremental plastic displacement effect on the fracture toughness curves was analyzed. The test results were also normalized and compared with SA516 Gr.70. It was found that the fracture toughness curves were degraded with small incremental displacement regardless of the kind of material. The normalized fracture toughness data showed that the small incremental plastic displacement induces a similar trend in lower fracture toughness in both materials. It seemed that the normalized fracture toughness curves are limited by the elongation of the materials.
Keywords: seismic load, reverse cyclic load, fracture resistance curve, fracture toughness
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