The effect of radial hydride on the room temperature fracture toughness of the Zr-2.5Nb pressure tube material with 100% radial hydrides and hydrogen content up to 320wppm was investigated using curved compact tension (CCT) specimens. The hydride continuity coefficients (HCC) representing hydrogen content and hydride orientation were determined between 0 and 1. It was observed that the role of plastic deformation on the fracture toughness mechanism decreases with increase in HCC. On a semi-log scale the fracture toughness of the Zr-2.5Nb pressure tube varied linearly with HCC at room temperature and this is characteristic feature for the Zirconium alloys.

中文翻译：

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径向氢化物对Zr-2.5Nb压力管材料室温断裂韧性的影响

使用弯曲压缩张力（CCT）样品研究了径向氢化物对含100％径向氢化物和氢含量高达320wppm的Zr-2.5Nb压力管材料的室温断裂韧性的影响。确定代表氢含量和氢化物取向的氢化物连续性系数（HCC）在0和1之间。观察到，塑性变形对断裂韧性机理的作用随着HCC的增加而降低。在半对数尺度上，Zr-2.5Nb压力管的断裂韧性在室温下随HCC线性变化，这是锆合金的特征。