An Uncertainty Evaluation on the ΔKth and ΔKIC of Fine-grained Isotropic Graphite

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外文摘要：This paper intensively explores the critical issues related to the quantitative and accurate evaluations of FCG behavior in the early stage,macro fatigue fracture toughness,and the critical crack size for damage tolerance in nuclear graphite.To address these issues,scale-span FCG tests were carried out using two typical specimens,CT and SEM in-situ specimens.These results indicate that the FCG threshold and the effective FCG length have a significant correlation with the modified maximum loop stress theory for a mixed Ⅰ/Ⅱ mode.In particular,the effective FCG length(aeq)and the applied stress threshold of polycrystalline graphite are important parameters for fatigue damage tolerance design in engineering application.The influencing factors of ΔKth.eq and aeq were discussed in detail using the mixed Ⅰ/Ⅱ mode,respectively.In addition,the scattered values of ΔKIC for this graphite can be quantitatively estimated using the Weibull distribution equation.The predicated parameters and experimental results demonstrate a strong correlation.

外文关键词：

Nuclear graphiteMixed Ⅰ/Ⅱ modeFatigue crackFatigue crack growth thresholdFatigue fracture toughness

作者：

Yantian Zhang、Lina Zhu、Ruiguo Yan、Xishu Wang

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作者单位：

Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China

Wheel-Rail Center,Tianjin Research Institute for Advanced Equipment,Tsinghua University,Tianjin 300300,China

基金：

National S&T Major ProjectNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

ZX069011157217011872225

出版年：

2024

DOI：

10.1007/s10338-024-00476-6

固体力学学报(英文版)

中国力学学会

固体力学学报(英文版)

影响因子：0.214

ISSN：0894-9166

年,卷(期)：2024.37(3)