散粒体床的循环热-力学特性：弹塑性的影响
Cyclic thermo-mechanical performance of granular beds: Effect of elastoplasticity
摘要：
了解压实颗粒床的耦合热-力学行为可以有益于各种工业应用，例如聚变反应堆中的球床设计。本文在前人工作的基础上，改进了热力离散元方法，并将其应用于弹塑性颗粒组成的充气颗粒材料循环热力性能的研究。建立了考虑晶粒塑性形变的颗粒间接触模型。通过对铍卵石床的代表性体积元的模拟，我们提供了颗粒尺度的热导率和应力的演变。模拟结果表明，网络的热接触是阻碍塑性形变导致显着下降的导热系数在冷却过程中。这种影响可以通过增加初始填充因子来抑制。不仅限于卵石床设计，这项工作的结论也可以为优化粉末基制造和储能铺平道路，其中涉及热机械载荷条件和单个颗粒的弹塑性变形。
英文摘要：
Understanding the coupled thermo-mechanical behaviour of compacted granular beds can benefit various industrial applications, such as pebble bed design in fusion reactors. In this study, a thermo-mechanical discrete element method based on our previous work is improved and adapted to investigate the cyclic thermo-mechanical performance of gas-filled granular materials composed of elastoplastic grains. An interparticle contact model is developed considering the plastic deformation of grains. Through the simulation on a representative volume element of beryllium pebble beds, we provide grain-scale insight into the evolution of thermal conductivity and stress. The simulation results suggest that the network of thermal contacts is impeded by plastic deformation leading to a significant drop of thermal conductivity during cooling. This effect can be suppressed by increasing the initial packing factor. Not limited to pebble bed design, the conclusion of this work can also pave the way for optimizing powder-based manufacturing and energy storage, where combined thermo-mechanical loading conditions and elastoplastic deformation of individual particles are involved.
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