Holddown Force Analysis Model Research of Fuel Assembly Leaf Springs with Varied Stiffness
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摘要: 为开展压水堆燃料组件变刚度板弹簧的压紧力分析，本文在分析了传统板弹簧加卸载过程的基础上，综合考虑温度变化、辐照生长和辐照松弛等影响因素，进一步分析了变刚度板弹簧在不同加卸载过程中的压紧力变化，给出了变刚度板弹簧的全过程载荷-变形曲线。分析结果表明：燃料组件辐照生长增加了变刚度板弹簧的变形，但不改变加卸载刚度曲线；变刚度板弹簧的辐照松弛过程可分解为2组板弹簧的并联，并分开考虑其辐照松弛量，刚度曲线特性保持不变；当燃料组件辐照生长量大于板弹簧辐照松弛量时，板弹簧的塑性变形将增加。Abstract: In order to conduct the holddown force analysis of the leaf spring with varied stiffness of PWR fuel assembly, this paper firstly analyzes the loading and unloading processes of the traditional leaf spring, and then comprehensively considers the influence factors such as temperature change, irradiation growth and irradiation relaxation. The holddown force change of the leaf spring with varied stiffness during different loading and unloading processes is further analyzed, and the load-deformation curve of the leaf spring with varied stiffness in the whole process is given. The analysis results show that the irradiated growth of fuel assembly increases the deformation of the leaf spring, but does not change the loading and unloading stiffness curves. The radiation relaxation process of the leaf spring with varied stiffness can be divided into two groups of leaf springs in parallel. Their radiation relaxation amounts are considered separately, and the stiffness curve characteristics remain unchanged. When the radiation growth of fuel assembly is greater than the radiation relaxation of the leaf spring, the plastic deformation of the leaf spring will increase.
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Key words:
- Fuel assembly /
- Varied stiffness /
- Leaf spring /
- Holddown force
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图 1 变刚度板弹簧与传统板弹簧结构对比示意图[3]
Figure 1. Comparison of Leaf Spring with Varied Stiffness and Traditional Leaf Spring
图 8 冷收缩过程示意图（无新增塑性变形）
Figure 8. Diagram of Cold Contraction Process (without New Plastic Deformation)
图 9 冷收缩过程示意图（新增塑性变形）
Figure 9. Diagram of Cold Contraction Process (with New Plastic Deformation)
图 10 变刚度板弹簧加卸载刚度曲线示意图
Figure 10. Diagram of Loading and Unloading Stiffness Curves of Leaf Spring with Varied Stiffness
图 11 热膨胀卸载和辐照生长加载过程示意图
Figure 11. Diagram of Loading Process of Thermal Expansion and Irradiation Growth
图 12 变刚度板弹簧仅2片承载时的受力模型示意图
Figure 12. Force Model of Leaf Spring with Varied Stiffness when Only 2 Springs are Loaded
图 13 变刚度板弹簧仅两片承载时辐照松弛后刚度曲线
Figure 13. Stiffness Curve after Irradiation Relaxation of the Leaf Spring with Varied Stiffness when Only Two Springs are Loaded
图 14 变刚度板弹簧3片承载时的受力模型示意图
Figure 14. Force Model of Leaf Spring with Varied Stiffness when 3 Springs are Loaded
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