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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Fracture strength and principal stress fields during crush testing of the SiC layer in TRISO-coated fuel particles
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Fracture strength and principal stress fields during crush testing of the SiC layer in TRISO-coated fuel particles

机译：TRISO涂层燃料颗粒中SiC层的压碎测试过程中的断裂强度和主应力场

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Diametrical compression testing is an important technique to evaluate fracture properties of the SiC layer in TRISO-coated nuclear fuel particles. This study was conducted to expand the understanding and improve the methodology of the test. An analytic solution and multiple FEA models are used to determine the development of the principal stress fields in the SiC shell during a crush test. An ideal fracture condition where the diametrical compression test best mimics in-service internal pressurization conditions was discovered. For a small set of empirical data points, results from different analysis methodologies were input to an iterative Weibull equation set to determine characteristic strength (332.9 MPa) and Weibull modulus (3.80). These results correlate well with published research. It is shown that SiC shell asphericity is currently the limiting factor of greatest concern to obtaining repeatable results. Improvements to the FEA are the only apparent method for incorporating asphericity and improving accuracy. (C) 2016 Elsevier B.V. All rights reserved.
机译：径向压缩试验是评估TRISO涂层核燃料颗粒中SiC层断裂性能的重要技术。进行这项研究是为了扩大对测试的理解并改进测试方法。使用解析解决方案和多个FEA模型确定在压碎测试过程中SiC壳中主应力场的发展。发现了理想的断裂条件，在该条件下，径向压缩试验最能模拟在役内部加压条件。对于少量的经验数据点，将来自不同分析方法的结果输入到迭代的Weibull方程组中，以确定特征强度（332.9 MPa）和Weibull模量（3.80）。这些结果与已发表的研究很好地相关。结果表明，SiC壳的非球面性是目前获得可重复结果时最为关注的限制因素。对FEA的改进是合并非球面度和提高精度的唯一明显方法。 （C）2016 Elsevier B.V.保留所有权利。

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