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| 核级石墨PFC2D模型的宏细观参数分析 |
| Macro-microparameters of Nuclear Graphite PFC2D model |
| 投稿时间：2022-08-14 修订日期：2022-09-22 |
| DOI： |
| 中文关键词: 核级石墨 PFC2D 正交试验设计 宏细观参数关系 |
| 英文关键词:Nuclear graphite PFC2D Orthogonal experimental design Macro-microparameter relationships |
| 基金项目:贵州省科技计划重点项目（黔科合基础-ZK[2022]重点007）,国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 颗粒流软件(PFC)能够很好地处理非连续介质力学的问题，在模拟核级石墨的损伤和断裂过程具有独特的优势。在采用PFC2D模拟核级石墨时，为了增加模拟的便捷性，实现PFC2D细观参数的快速标定。本文首先设计了四因素四水平的正交试验，分析了核级石墨的宏观参数与PFC2D的细观参数的关系；然后基于建立的核级石墨宏细观参数的关系，采用PFC2D模拟石墨IG11的三点弯曲试验，并从位移场变形、荷载-位移曲线和断裂参数三个方面验证其宏细观参数的关系的正确性。结果表明：弹性模量(E)随平节理模量(Ec)的增加线性增加；抗拉强度(σt)随平节理抗拉强度(σb)的增加线性增加；泊松比(ν)随平节理刚度比(kn/ks)的增加先增大后减小；数值模拟的位移场变化和荷载-裂缝口张开位移(P-CMOD)曲线与试验结果较吻合，此外，断裂参数的最大误差不超过3.57%。 |
| 英文摘要: |
| Particle Flow Code (PFC) can well deal with the problem of non-continuous media mechanics, and has unique advantages in simulating the damage and fracture process of nuclear graphite. In order to increase the convenience of using PFC2D to simulate nuclear graphite, the rapid calibration of PFC2D micro-parameters can be achieved. Firstly, the orthogonal experiment with four factors and four levels is designed to analyze the relationship between the macro-parameters of nuclear graphite and the micro-parameters of PFC2D. Then, based on the established relationship between macro-microparameters of nuclear graphite, the three-point bending test of graphite IG11 is simulated by PFC2D, and the correctness of the relationship between macro-microparameters is verified from three aspects: displacement field deformation, load-displacement curve and fracture parameters. The results show that Young's modulus (E) increases linearly with the increase of the effective modulus (Ec). The tensile strength (σt) increases linearly with the increase of the bond tensile strength (σb) of the flat joint. Poisson's ratio (ν) firstly increases and then decreases with the increase of the stiffness ratio (kn/ks). The numerical simulation results of displacement field variation and load-crack mouth opening of displacement (P-CMOD) curve coincide with the test results. In addition, the maximum error of fracture parameters is not more than 3.57%. |
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