{"title":"Three-dimensional fracture of UO2 ceramic pellets by phase field modeling","authors":"Wei Xiong, Xuan Ye, Hongzhang Cheng, Xiaoming Liu","doi":"10.1007/s11433-024-2509-2","DOIUrl":null,"url":null,"abstract":"<div><p>Fracture is the primary failure type for the UO<sub>2</sub> ceramic pellets, which are operated under irradiation and thermal processes, and physically confined by the cladding. In this work, by combining closely coupled physical processes of heat conduction, heat transfer, and mechanical deformation with the cohesive phase field framework, we proposed a high-precision modeling of quasi-static cracking of three-dimensional (3D) UO<sub>2</sub> ceramic fuel pellets under high temperature and irradiation. The simulation results agree well with the experimental results, indicating that the proposed method has the potential to capture 3D crack modes in the interested time range. Further, we studied the relation of the 3D fracture patterns of fuel pellets with the peak power densities. It was found that the power level plays a critical role in determining the competition between radial and circumferential cracks, as well as transverse penetrating cracks.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 1","pages":""},"PeriodicalIF":6.4000,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Physics, Mechanics & Astronomy","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s11433-024-2509-2","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Fracture is the primary failure type for the UO2 ceramic pellets, which are operated under irradiation and thermal processes, and physically confined by the cladding. In this work, by combining closely coupled physical processes of heat conduction, heat transfer, and mechanical deformation with the cohesive phase field framework, we proposed a high-precision modeling of quasi-static cracking of three-dimensional (3D) UO2 ceramic fuel pellets under high temperature and irradiation. The simulation results agree well with the experimental results, indicating that the proposed method has the potential to capture 3D crack modes in the interested time range. Further, we studied the relation of the 3D fracture patterns of fuel pellets with the peak power densities. It was found that the power level plays a critical role in determining the competition between radial and circumferential cracks, as well as transverse penetrating cracks.
期刊介绍：
Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index.
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