采用影响系数法求解任意应力分布下压力容器喷口角裂纹的应力强度因子

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-04-04 DOI:10.1016/j.ijpvp.2025.105519

Dasheng Wang , Ting Jin , Yanggang Duan , Yuebing Li , Yang Liu , Pan Liu , Xiao Xu

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引用次数: 0

摘要

核电站压力容器喷口具有几何不连续、复杂恶劣载荷和应力集中等特点，导致喷口角处应力水平高、应力分布复杂，是进行结构断裂力学评价的关键区域。本文的研究目的是提出任意应力分布下喷管角裂纹应力强度因子（SIF）的工程计算方法。首先，基于影响系数法（IFM）原理和线弹性断裂力学理论，提出了考虑喷嘴角区应力分布特点的IFM影响系数计算方法；随后，分析了大量有裂纹和无裂纹喷嘴的有限元模型，得到了覆盖一定几何尺寸和裂纹尺寸范围的影响系数表，并用于计算喷嘴转角裂纹的SIFs。最后，结合核压力容器的实际使用载荷，验证了利用本文所得到的影响系数表计算的SIFs的适用性和保守性。本文建立的影响系数表可以通过影响系数计算方法进行扩展，从而可以应用于更大范围的具有喷嘴角裂纹的喷嘴的SIF计算。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Stress intensity factor solution for pressurized vessel nozzle corner crack subjected to an arbitrary stress distribution using the influence coefficient method

The nozzle of pressurized vessel in nuclear power plants exhibits geometrical discontinuities, complex and harsh loads, and stress concentration, leading to a high stress level and complex stress distribution in the nozzle corner, it is a crucial region for structural fracture mechanical evaluation. The aim of this study is to present an engineering calculation method for the stress intensity factor (SIF) of the nozzle corner cracks under arbitrary stress distribution. Firstly, based on the principle of the influence coefficient method (IFM) and the theory of linear elastic fracture mechanics, the calculation method of the influence coefficients in IFM is provided considering the stress distribution characteristics of the nozzle corner region. Subsequently, a large number of finite element models of nozzles with and without crack are analyzed, and then the influence coefficient tables covering a certain range of geometric and crack size are obtained and used for calculation the SIFs of the nozzle corner cracks. Finally, the applicability and conservativeness of the SIFs calculated by using the influence coefficient tables obtained in this paper are verified considering the actual service loads of the nuclear pressurized vessel. The influence coefficient tables established in the paper can be extended by using the influence coefficient calculation method, and then can be applied to the SIF calculation in a wider range of nozzles with nozzle corner cracks.

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.