Specimen reconstitution method for the assessment of fracture properties of reactor pressure vessel steels

IF 4.7 2区工程技术 Q1 MECHANICS Engineering Fracture Mechanics Pub Date : 2024-11-07 DOI:10.1016/j.engfracmech.2024.110610

Shuang Qi , Yinghui An , Wenjing Ding , Ping Huang , Minyu Fan , Kuiyuan Fang , Chen Bao , Kexin Cai

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Abstract

Routine testing of the fracture properties of irradiated surveillance specimens is a critical method for evaluating irradiation embrittlement in reactor pressure vessel (RPV) steels. Given the limited space in irradiation surveillance tubes, specimen reconstitution technology is expected to provide a viable solution to the shortage of irradiated specimens. This study investigates the specimen reconstitution method for 16MND5 steel 0.5 T CT specimens used in the RPV. By studying the local mechanical properties of the residual specimen and performing finite element analysis of the crack tip plastic zone, the appropriate size for specimen reconstitution is determined. The electron beam welding method is used to join the residual specimen and the base material, and the J-integral formula for the reconstituted specimen is determined based on the finite element analysis, taking into account the influence of the weld seam and the degradation of the mechanical properties of the residual specimen. The feasibility of the specimen reconstitution method is validated through fracture tests on base material specimens and reconstituted specimens at different temperature.

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评估反应堆压力容器钢断裂特性的试样重组方法

对辐照监测试样的断裂特性进行常规测试，是评估反应堆压力容器（RPV）钢辐照脆性的重要方法。鉴于辐照监测管空间有限，试样重组技术有望为辐照试样短缺问题提供可行的解决方案。本研究调查了用于 RPV 的 16MND5 钢 0.5 T CT 试样的试样重组方法。通过研究残余试样的局部机械性能和对裂纹尖端塑性区进行有限元分析，确定了试样重组的适当尺寸。采用电子束焊接方法连接残余试样和母材，并在有限元分析的基础上确定重组试样的 J 积分公式，同时考虑到焊缝的影响和残余试样机械性能的退化。通过在不同温度下对母材试样和重组试样进行断裂测试，验证了试样重组方法的可行性。

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.