The threshold stress intensity factor
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This work studies the threshold stress intensity factor (KIH) to initiate DHC as a function of temperature in Zry-4 for temperatures between 227C and 315C. The experimental technique used in this study was the pin-loading testing technique. To determine the KIH, an unloading method was used where the load was successively reduced in a stepwise manner until no cracking was observed during 24 hours.
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minhxaminhyeu4
26-06-2019
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The research results for radial cracking cases indicate that a better agreement for KIH can be achieved; the negative axial thermal stresses can lessen KIH and enlarge the critical hydride length, so its effect should be considered in the safety evaluation and constraint design for fuel rods; the critical hydride length lC changes slightly in a certain range of stress intensity factors, which interprets the phenomenon that the DHC velocity varies slowly in the steady crack growth stage.
10p minhxaminhyeu3
25-06-2019
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