UMo/Zr单片式燃料板起泡行为数值模拟

燃料板的鼓泡临界温度是制定研究试验堆安全系数的标准之一，通常由鼓泡退火实验确定。针对鼓泡退火实验，本研究发展了一种对UMo/Zr单片式燃料板宏观起泡行为进行计算模拟的方法，并计算分析了气腔内裂变气体原子数对鼓泡高度的影响，获得了包壳内的Mises应力和等效塑性应变随温度升高而演化的规律。研究发现，气腔周围包壳产生塑性变形是起泡的一个关键原因。此研究为燃料板起泡机理和关键影响因素分析打下了基础。

Numerical Simulation of Blistering Behavior in UMo/Zr Monolithic Fuel Plate

Blister thresholds of fuel plates are a standard to establish the safety margin for research and test reactors. The thresholds are determined by blister anneal test. In this study, a method was developed for simulating the blistering behavior of UMo/Zr monolithic fuel plates during annealing, and the influence of the number of internal fission gas atoms on the blister height was investigated. The evolution laws were obtained for the Mises stresses and the equivalent plastic strains in the cladding. The research results indicate that it is a critical reason for blistering that plastic strains occur in the cladding part surrounding the vacancy. This study lays a foundation for analyzing the mechanism and critical influence factors of blistering behavior.