利用 XFEM 分析 TRISO 粒子 IPyC 层的微缺陷诱导裂纹

IF 1.5 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Yunhao Li, Qian Wei, Luxian Li
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引用次数: 0

摘要

目的我们采用扩展有限元法(XFEM)模拟了在辐照诱导的热机械耦合环境下,三结构各向同性(TRISO)颗粒内部致密热解碳(IPyC)层中由微缺陷诱导的裂纹萌发和扩展的全过程,并研究了微缺陷尺寸对扩展路径的影响。设计/方法/途径首先使用传统有限元方法(CFEM)对 TRISO 粒子的代表体积元素(RVE)进行辐照诱导热机械耦合分析,从而获得应力分布。然后还原丰富元素的应力结果,最后使用 XFEM 对裂纹的产生和扩展进行模拟。当裂纹在 IPyC 层中产生时,最终将终止于 RVE TRISO 粒子的自由边缘。2.原创性/价值陶瓷分散微囊(CDM)燃料是一种良好的抗事故燃料,其安全运行对整个核反应堆的安全性和可靠性至关重要。研究 CDM 燃料 TRISO 粒子 IPyC 层辐照诱导的热机械耦合应力分布和裂纹行为具有重要的科学意义和实用价值。对于这种复杂的多层结构,裂纹起始和扩展分析是一项挑战。这有助于了解 TRISO 颗粒的失效机理,并评估反应堆的运行安全性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of micro-defect-induced cracking in the IPyC layer of TRISO particle with the XFEM

Purpose

We use the extended finite element method (XFEM) to model the whole process of initiation and propagation of cracks in the inner dense pyrolytic carbon (IPyC) layer of tri-structural isotropic (TRISO) particle induced by the microdefect in an irradiation-induced thermomechanical coupling environment and study the effect of microdefect sizes on the propagation path.

Design/methodology/approach

The irradiation-induced thermal–mechanical coupling analysis is first conducted for the representative volume element (RVE) of the TRISO particle by using the conventional finite element method (CFEM) so that the stress distribution is obtained. The stress results are then restored for the enriched elements, and the simulation of crack initiation and propagation is eventually carried out by using the XFEM.

Findings

1. As a crack initiates in the IPyC layer, it will terminate at the free edge of the RVE TRISO particle in the end. 2. The size of the microdefect has a significant impact on the propagation path.

Originality/value

The ceramic dispersion microencapsulated (CDM) fuel is a good accident-resistant fuel whose safe operation is crucial to the safety and reliability of the whole nuclear reactor. It is of great scientific significance and practical value to study the irradiation-induced thermomechanical coupling stress distribution and cracking behavior in the IPyC layer of TRISO particles for the CDM fuel. Crack initiation and propagation analysis is challengeable for this complex multi-layer structure. This can help understand the failure mechanism of TRISO particles and evaluate the operation safety of the reactor.

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来源期刊
Engineering Computations
Engineering Computations 工程技术-工程:综合
CiteScore
3.40
自引率
6.20%
发文量
61
审稿时长
5 months
期刊介绍: The journal presents its readers with broad coverage across all branches of engineering and science of the latest development and application of new solution algorithms, innovative numerical methods and/or solution techniques directed at the utilization of computational methods in engineering analysis, engineering design and practice. For more information visit: http://www.emeraldgrouppublishing.com/ec.htm
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