基于多点随机模拟的裂纹扩展动力学预测

IF 0.9 Q3 NUCLEAR SCIENCE & TECHNOLOGY
Etienne Le Mire, E. Burger, B. Iooss, C. Mai
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引用次数: 2

摘要

通过对应力腐蚀裂纹模型的改进,可以改善核电站一次回路部件应力腐蚀裂纹扩展动力学的预测。估计断裂时间的步骤之一是裂纹扩展准则。目前的模型使用宏观测量(如应力、应变),例如使用有限元法获得。为了深入到微观尺度并使用局部措施,提出了两步方法。首先,模拟了在特定载荷下代表材料的合成微观结构,并用统计方法验证了它们的质量。其次,计算了从传播时间出发的最短破裂路径,并将这些合成的破裂时间与仅从宏观值估计的破裂时间的分布进行了比较。第一步采用基于交叉相关的仿真算法(CCSIM)实现,这是一种从训练场生成合成随机场的多点仿真算法。推动者的距离是一个度量,它允许评估实现的质量。最短路径的计算采用Dijkstra算法实现。与宏观方法相比,这种方法可以在裂纹扩展动力学的预测中得到改进。观察到加载条件对计算的合成断裂时间分布的影响,可以通过更稳健地使用CCSIM来减少这种影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prediction of crack propagation kinetics through multipoint stochastic simulations of microscopic fields
Prediction of crack propagation kinetics in the components of nuclear plant primary circuits undergoing Stress Corrosion Cracking (SCC) can be improved by a refinement of the SCC models. One of the steps in the estimation of the time to rupture is the crack propagation criterion. Current models make use of macroscopic measures (e.g. stress, strain) obtained for instance using the Finite Element Method. To go down to the microscopic scale and use local measures, a two-step approach is proposed. First, synthetic microstructures representing the material under specific loadings are simulated, and their quality is validated using statistical measures. Second, the shortest path to rupture in terms of propagation time is computed, and the distribution of those synthetic times to rupture is compared with the time to rupture estimated only from macroscopic values. The first step is realized with the cross-correlation-based simulation (CCSIM), a multipoint simulation algorithm that produces synthetic stochastic fields from a training field. The Earth Mover’s Distance is the metric which allows to assess the quality of the realizations. The computation of shortest paths is realized using Dijkstra’s algorithm. This approach allows to obtain a refinement in the prediction of the kinetics of crack propagation compared to the macroscopic approach. An influence of the loading conditions on the distribution of the computed synthetic times to rupture was observed, which could be reduced through a more robust use of the CCSIM.
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来源期刊
EPJ Nuclear Sciences & Technologies
EPJ Nuclear Sciences & Technologies NUCLEAR SCIENCE & TECHNOLOGY-
CiteScore
1.00
自引率
20.00%
发文量
18
审稿时长
10 weeks
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