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Vol.41, No.10, 620 ~ 627, 2003
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| Title |
| Effects of Final Annealing Temperatures on the Burst Strength of Nuclear Fuel Cladding |
| 김경호 Kim Gyeong Ho , 이민구 Lee Min Gu , 이창규 Lee Chang Gyu , 김훙회 Kim Hung Hoe , 위명용 Wi Myeong Yong |
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| Abstract |
| The burst tests of low tin Zircaloy-4 claddings were conducted in order to characterize high temperature deformation behavior and burst strength characteristics in relation to heat treatment condition and testing temperatures, which varies from room temperature to 500℃. While the uniform burst elongation and total circumferential elongation value of stress-relieved tubes are smaller than those of fully-recrystallized tubes, the ultimate hoop stresses are larger than those of fully recrystallized tubes at all test temperatures. The inflection point of elongation was 300℃ for stress relived tubes and the maximum elongation point was 400℃ for fully recrystallized tube. The burst mechanism was believed to be that, after deformation was uniformly exerted on the specimen circumferentially until maximum circumferential stress was reached, pin-hole fracture was induced by the local stress concentration, which results from the decreasing tube thickness. |
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| Key Words |
| Zircaloy-4, Burst test, Burst strength, Uniform burst elongation, Total circumferential elongation, Ultimate hoop stress |
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