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Mechanical properties of recrystallized and stress-relieved Zircaloy-4 cladding tubes under biaxial stress conditions

再結晶および応力除去焼鈍したジルカロイ4被覆管の二軸応力下における機械的性質

三原 武  ; 宇田川 豊  ; 天谷 政樹  

Mihara, Takeshi; Udagawa, Yutaka; Amaya, Masaki

In order to elucidate the failure behavior of light water reactor fuel cladding tubes caused by the pellet-cladding mechanical interaction loading under pellet-cladding mechanical interaction conditions, the anisotropic deformation characteristics of Zircaloy4 cladding tubes were investigated. Mechanical tests were performed on recrystallized and stress-relieved Zircaloy-4 cladding tubes at nine stress ratios $$alpha$$ ($$alpha$$=axial stress/ circumferential stress). Both RX and SR materials showed anisotropy in their contours of plastic works. The minimums of the equivalent plastic strains at fracture were located at stress ratios of $$alpha$$= 1 and 0.75 for RX and SR materials, respectively.

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