Thermomechanical Analysis for an All-Tungsten ARIES Divertor
Thermomechanical Analysis for an All-Tungsten ARIES Divertor
复制标题
全钨 ARIES 偏滤器的热机械分析
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Martin
中科院分区：
文献类型：
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作者：
J. Blanchard;C. Martin
白羊座团队目前正在为托卡马克的设计提出两个钨偏滤器概念，并进行了广泛的分析，以优化它们的热性能和结构性能。由于偏滤器的工作温度较高，而钨的延展性较低，热蠕变和断裂将是重要的失效机制。本文提出了一系列有限元分析，以解决这些钨板偏滤器概念的可行工作范围的蠕变和断裂。对于断裂，J积分是一种路径无关的轮廓积分，它估计假定几何形状的裂纹的应变能释放率，用于处理裂纹扩展。在冷却剂通道内外都引入了椭圆形表面裂纹，并对全功率和冷停堆两种情况进行了稳态计算。结果表明，在全功率运行时，临界裂纹位于应力强度最大的冷却剂通道内侧。此外，还进行了瞬时蠕变模拟，以预测不同表面通量水平下的高温热变形和蠕变应变。最后，进行了暂态热计算，模拟了等离子体中的边缘局域模式，并得出了两种概念下这些事件相对于表面熔化的严重程度和频率的结论。
Abstract The ARIES team is currently proposing two tungsten divertor concepts for its tokamak designs and has performed extensive analyses to optimize their thermal and structural performance. Because of the high divertor operating temperatures and the low ductility of tungsten, thermal creep and fracture will be important failure mechanisms to consider. This paper presents a series of finite element analyses addressing the viable operating ranges of these tungsten plate divertor concepts with respect to creep and fracture. For fracture, the J-integral, a path-independent contour integral that estimates the strain energy release rate for a crack of assumed geometry, is used to address crack propagation. Elliptical surface cracks are introduced both inside and outside the coolant channel, and steady-state calculations are carried out for both full-power and cold shutdown conditions. It is determined that the critical crack is on the inside of the coolant channel with the highest stress intensities at full-power operation. Also, transient creep simulations are performed to predict the high-temperature thermal deformations and creep strains at various surface flux levels. Finally, transient thermal calculations are carried out to simulate edge-localized modes in the plasma, and conclusions are drawn with respect to the severity and frequency of these events with respect to surface melting for the two concepts.