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학술저널
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한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제48권 제6호
발행연도
2016.1
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1,376 - 1,386 (11page)

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This study investigated the loading rate effect on the fracture resistance under cyclicloading conditions to understand clearly the fracture behavior of piping materials underseismic conditions. JeR fracture toughness tests were conducted under monotonic andcyclic loading conditions at various displacement rates at room temperature and theoperating temperature of nuclear power plants (i.e., 316 C). SA508 Gr.1a low-alloy steel andSA312 TP316 stainless steel piping materials were used for the tests. The fracture resistanceunder a reversible cyclic load was considerably lower than that under monotonicload regardless of test temperature, material, and loading rate. Under both cyclic andmonotonic loading conditions, the fracture behavior of SA312 TP316 stainless steel wasindependent of the loading rate at both room temperature and 316 C. For SA508 Gr.1a lowalloysteel, the loading rate effect on the fracture behavior was appreciable at 316 C undercyclic and monotonic loading conditions. However, the loading rate effect diminishedwhen the cyclic load ratio of the load (R) was 1. Thus, it was recognized that the fracturebehavior of piping materials, including seismic loading characteristics, can be evaluatedwhen tested under a cyclic load of R ¼ 1 at a quasistatic loading rate.

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