应用现代方法建立应力-应变状态数值模型,评估核电站一次回路设备复杂单元的强度。第 3 部分.应用子建模技术和扩展有限元法计算反应堆压力容器喷嘴区

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-09-16 DOI:10.1007/s11223-024-00662-4
E. O. Kondryakov, V. V. Kharchenko
{"title":"应用现代方法建立应力-应变状态数值模型,评估核电站一次回路设备复杂单元的强度。第 3 部分.应用子建模技术和扩展有限元法计算反应堆压力容器喷嘴区","authors":"E. O. Kondryakov, V. V. Kharchenko","doi":"10.1007/s11223-024-00662-4","DOIUrl":null,"url":null,"abstract":"<p>Recent studies have shown that nozzle zones are one of the most dangerous elements of the reactor vessel. High stresses in such nodes can lead to the appearance of angular cracks. At the same time, the issue of choosing the critical dimensions and direction of crack location from the point of view of calculations for resistance to brittle fracture remains open. The paper presents the results of numerical modeling of the stress-strain state of the nozzle zone of the reactor vessel by the classical finite element method (FEM) and the extended finite element method (XFEM) using the submodeling technique. The results of numerical modeling by the classical FEM for the mode of hydraulic testing of the reactor vessel pressure vessel nozzle zone with three types of cracks are presented: surface, subweld, and a crack with 1 mm penetration into the weld. For twelve types of cracks with variations in their size and direction of location in the reactor vessel pressure vessel nozzle zone, the results of calculations of resistance to brittle fracture by the XFEM method for one of the characteristic modes of thermal shock are presented. The calculation results proved that axial cracks are more dangerous than circular cracks of the same dimensions. Cracks with a semi-axis ratios <i>a</i>/<i>c</i> = 0.3 and <i>a</i>/<i>c</i> = 0.7 are more dangerous for the axial and circumferential directions, respectively. At the same time, cracks with <i>a</i>/<i>c</i> = 0.3 are more sensitive to the direction of location than cracks with <i>a</i>/<i>c</i> = 0.7. It was shown that the use of the XFEM method makes it possible to conduct a rapid assessment of the resistance to brittle fracture with the possibility of varying the shape, size, and location of the crack, which allows one to effectively determine its critical size and the most dangerous location in the structural element.</p>","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"24 1","pages":""},"PeriodicalIF":0.7000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Application of Modern Approaches to the Numerical Modeling of the Stress-Strain State for the Strength Assessment of Complex Units of the NPP Primary Circuit Equipment. Part 3. Application of Submodeling Technique and Extended Finite Element Method for Calculation of the Reactor Pressure Vessel Nozzle Zone\",\"authors\":\"E. O. Kondryakov, V. V. Kharchenko\",\"doi\":\"10.1007/s11223-024-00662-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Recent studies have shown that nozzle zones are one of the most dangerous elements of the reactor vessel. High stresses in such nodes can lead to the appearance of angular cracks. At the same time, the issue of choosing the critical dimensions and direction of crack location from the point of view of calculations for resistance to brittle fracture remains open. The paper presents the results of numerical modeling of the stress-strain state of the nozzle zone of the reactor vessel by the classical finite element method (FEM) and the extended finite element method (XFEM) using the submodeling technique. The results of numerical modeling by the classical FEM for the mode of hydraulic testing of the reactor vessel pressure vessel nozzle zone with three types of cracks are presented: surface, subweld, and a crack with 1 mm penetration into the weld. For twelve types of cracks with variations in their size and direction of location in the reactor vessel pressure vessel nozzle zone, the results of calculations of resistance to brittle fracture by the XFEM method for one of the characteristic modes of thermal shock are presented. The calculation results proved that axial cracks are more dangerous than circular cracks of the same dimensions. Cracks with a semi-axis ratios <i>a</i>/<i>c</i> = 0.3 and <i>a</i>/<i>c</i> = 0.7 are more dangerous for the axial and circumferential directions, respectively. At the same time, cracks with <i>a</i>/<i>c</i> = 0.3 are more sensitive to the direction of location than cracks with <i>a</i>/<i>c</i> = 0.7. It was shown that the use of the XFEM method makes it possible to conduct a rapid assessment of the resistance to brittle fracture with the possibility of varying the shape, size, and location of the crack, which allows one to effectively determine its critical size and the most dangerous location in the structural element.</p>\",\"PeriodicalId\":22007,\"journal\":{\"name\":\"Strength of Materials\",\"volume\":\"24 1\",\"pages\":\"\"},\"PeriodicalIF\":0.7000,\"publicationDate\":\"2024-09-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Strength of Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1007/s11223-024-00662-4\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, CHARACTERIZATION & TESTING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Strength of Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s11223-024-00662-4","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
引用次数: 0

摘要

最近的研究表明,喷嘴区是反应堆容器中最危险的部分之一。这些节点上的高应力会导致角裂纹的出现。与此同时,从计算抗脆性断裂的角度来看,如何选择临界尺寸和裂纹位置方向的问题仍然悬而未决。本文介绍了采用经典有限元法(FEM)和子模型技术的扩展有限元法(XFEM)对反应堆容器喷嘴区的应力应变状态进行数值建模的结果。本文介绍了采用经典有限元法对反应堆压力容器喷嘴区的水压试验模式进行数值建模的结果,包括三种类型的裂纹:表面裂纹、焊缝下裂纹和渗入焊缝 1 毫米的裂纹。对于反应堆压力容器喷嘴区内尺寸和位置方向不同的 12 种裂纹,采用 XFEM 方法对其中一种热冲击特征模式的脆性断裂阻力进行了计算,并给出了计算结果。计算结果证明,轴向裂纹比相同尺寸的圆形裂纹更危险。半轴比 a/c = 0.3 和 a/c = 0.7 的裂缝分别对轴向和圆周方向更危险。同时,与 a/c = 0.7 的裂缝相比,a/c = 0.3 的裂缝对位置方向更为敏感。研究表明,使用 XFEM 方法可以快速评估脆性断裂的抗力,并可改变裂缝的形状、尺寸和位置,从而有效确定裂缝的临界尺寸和结构元件中最危险的位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

摘要图片

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
Application of Modern Approaches to the Numerical Modeling of the Stress-Strain State for the Strength Assessment of Complex Units of the NPP Primary Circuit Equipment. Part 3. Application of Submodeling Technique and Extended Finite Element Method for Calculation of the Reactor Pressure Vessel Nozzle Zone

Recent studies have shown that nozzle zones are one of the most dangerous elements of the reactor vessel. High stresses in such nodes can lead to the appearance of angular cracks. At the same time, the issue of choosing the critical dimensions and direction of crack location from the point of view of calculations for resistance to brittle fracture remains open. The paper presents the results of numerical modeling of the stress-strain state of the nozzle zone of the reactor vessel by the classical finite element method (FEM) and the extended finite element method (XFEM) using the submodeling technique. The results of numerical modeling by the classical FEM for the mode of hydraulic testing of the reactor vessel pressure vessel nozzle zone with three types of cracks are presented: surface, subweld, and a crack with 1 mm penetration into the weld. For twelve types of cracks with variations in their size and direction of location in the reactor vessel pressure vessel nozzle zone, the results of calculations of resistance to brittle fracture by the XFEM method for one of the characteristic modes of thermal shock are presented. The calculation results proved that axial cracks are more dangerous than circular cracks of the same dimensions. Cracks with a semi-axis ratios a/c = 0.3 and a/c = 0.7 are more dangerous for the axial and circumferential directions, respectively. At the same time, cracks with a/c = 0.3 are more sensitive to the direction of location than cracks with a/c = 0.7. It was shown that the use of the XFEM method makes it possible to conduct a rapid assessment of the resistance to brittle fracture with the possibility of varying the shape, size, and location of the crack, which allows one to effectively determine its critical size and the most dangerous location in the structural element.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
期刊最新文献
Simulation Analysis of Mechanical Properties of DC Transmission Lines Under Mountain Fire Condition Eulerian Formulation of the Constitutive Relation for an Electro-Magneto-Elastic Material Class Impact Damage Prediction of Carbon Fiber Foam Sandwich Structure Based on the Hashin Failure Criterion Simulation of Low-Temperature Localized Serrated Deformation of Structural Materials in Liquid Helium Under Different Loading Modes and Potential Energy Accumulation Effect of Structural Anisotropy on a Fracture Mode of Ferromagnetic Steels Under Cyclic Loading
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1