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Biaxial-EDC test attempts with pre-cracked zircaloy-4 cladding tubes

予亀裂入りジルカロイ-4被覆管を用いた二軸EDC実験の試み

Li, F.  ; 三原 武 ; 宇田川 豊  ; 天谷 政樹  

Li, F.; Mihara, Takeshi; Udagawa, Yutaka; Amaya, Masaki

The failure behavior of cladding tube was investigated by using the improved EDC test apparatus. Cold-worked, stress-relieved and recrystallized Zircaloy-4 tubes with a pre-crack were used as test specimens: this pre-crack simulated the crack which is considered to form in the hydride rim of high-burnup fuel cladding at the beginning of PCMI failure. In the EDC test, a tensile stress in axial direction was applied and displacement-controlled loading was performed to keep the strain ratio of axial/hoop as a constant. The data of cladding deformation had been achieved in the range of strain ratio of 0, 0.25, 0.5 and 0.75 and pre-crack depth of 41-87 micrometers. Failures in hoop direction were observed in all the tested samples, and a general trend that higher strain ratio and deeper crack depth lead to lower failure limit in hoop direction could be seen. Different crack propagation mode was observed between recrystallized and stress relieved and cold worked samples.

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