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基于陶瓷燃料断裂强度建立弥散型燃料中陶瓷燃料颗粒开裂行为的数学模型。以铜基弥散型燃料为例,通过计算预测燃料颗粒的开裂温度与燃耗的关系,分析基体金属、环境约束、燃料相的体积、燃料颗粒尺寸对开裂温度的影响,探讨提高燃料颗粒开裂温度的途径。结果表明,燃料颗粒开裂温度与燃耗深度近似呈幂律关系,随燃料相体积的增加近似直线下降;裂变气体气孔率和孔径的增加利于提高颗粒的开裂温度。
Establishment of Mathematical Model of Cracking Behavior of Ceramic Fuel Particles in Diffusion Fuel Based on Breaking Strength of Ceramic Fuel. Taking copper-based diffusible fuel as an example, the relationship between the cracking temperature and fuel consumption of fuel particles was predicted, and the influence of matrix metal, environmental constraints, the volume of fuel phase and fuel particle size on cracking temperature was analyzed. Way. The results show that the fuel cracking temperature and fuel consumption depth are approximately power-law relationship, and decrease linearly with the increase of fuel-phase volume. The increase of fissure gas porosity and pore size can improve the cracking temperature.