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Effect of Reverse Cyclic Loading on the Fracture Resistance Curve of Nuclear Piping Material
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 Title & Authors
Effect of Reverse Cyclic Loading on the Fracture Resistance Curve of Nuclear Piping Material
Weon, Jong-Il; Seok, Chang-Sung;
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 Abstract
Fracture resistance(J-R) curves, which are used for the elastic-plastic fracture mechanics analyses, are known to be dependent on the cyclic loading history. The objective of this paper is to study the effect of reverse cyclic loading on J-R curves in CT specimens. The effect of two parameters was observed on the J-R curves during the reverse cyclic loading. One was the minimum-to-maximum load ratio(R) and the other was the incremental plastic displacement(), which is related to the amount of crack growth that occurs in a cycle. Fracture resistance test on CT specimens with varying load ratio and incremental plastic displacement were performed. For the SA 516 Gr. 70 steel, the results showed that the J-R curves were decreased with decreasing the load ratio and the incremental plastic displacement. When the load ratio was set to -1, the results of the J-R curves and the value were about percent of those for the monotonic loading condition. Also on condition that the incremental plastic displacement reached 1/40, the J-R curves and the value were about percent of those for the incremental plastic displacement of 1/10.
 Keywords
Reverse Cyclic Loading;Load Ratio;Incremental Plastic Displacement;J-R Curve;Single Specimen Method;Monotonic Loading;
 Language
Korean
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