| 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. †(Received May 04, 2016; Accepted August 30, 2016) |
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| Key Words |
| seismic load, reverse cyclic load, fracture resistance curve, fracture toughness |
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