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Mechanical Property Testing of Irradiated Zircaloy Cladding Under Reactor Transient Conditions

机译：反应堆瞬态条件下辐照锆合金熔覆层的力学性能测试

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摘要

Specimen geometries have been developed to determine the mechanical properties of irradiated Zircaloy cladding subjected to the mechanical conditions and temperatures associated with reactivity-initiated accidents (RIA) and loss-of-coolant accidents (LOCA). Miniature ring-stretch specimens were designed to induce both uniaxial and plane-strain states of stress in the transverse (hoop) direction of the cladding. Also, longitudinal tube specimens were also designed to determine the constitutive properties in the axial direction. Finite-element analysis (FEA) and experimental parameters and results were closely coupled to optimize an accurate determination of the stress-strain response and to induce fracture behavior representative of accident conditions. To determine the constitutive properties, a procedure was utilized to transform measured values of load and displacement to a stress-strain response under complex loading states. Additionally, methods have been developed to measure true plastic strains in the gauge section and the initiation of failure using real-time data analysis software. Strain rates and heating conditions have been selected based on their relevance to the mechanical response and temperatures of the cladding during the accidents.
机译：已经开发出样品几何形状，以确定受辐照的锆锡合金熔覆层的机械性能，这些熔覆层受到与反应性事故（RIA）和冷却液损失事故（LOCA）相关的机械条件和温度的影响。微型环形拉伸试样被设计为在包层的横向（箍）方向上引起应力的单轴和平面应变状态。此外，还设计了纵向试管样品，以确定轴向的本构性质。有限元分析（FEA）与实验参数和结果紧密耦合，以优化对应力-应变响应的准确确定，并诱发代表事故工况的断裂行为。为了确定本构特性，使用了一种程序将载荷和位移的测量值转换为复杂载荷状态下的应力应变响应。此外，已经开发了使用实时数据分析软件来测量量规部分中真实塑性应变和引发破坏的方法。应变率和加热条件的选择是基于事故期间包壳的机械响应和温度的相关性。

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