Direct FE2 multiscale simulation of hydrogen diffusion in Zircaloy cladding

IF 3.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2024-08-13 DOI:10.1007/s10409-024-24270-x

Han Zhao (, ), Xianghua Zheng (, ), Shiting Yang (, ), Xin Yang (, ), Wei Li (, )

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Abstract

This study utilizes Direct FE² multiscale simulation techniques to propose an innovative approach for analyzing hydrogen diffusion in Zircaloy cladding. This method combines finite element simulations at two scales into a monolithic framework by utilizing downscaling rules and scaling factors. Through the investigation, it was found that voids induce non-uniform diffusion of lattice hydrogen, demonstrating a strong correlation between trapped concentration and microstructure. Additionally, the accumulation of trapped hydrogen leads to localized plastic deformation and a reduction in effective diffusivity. Furthermore, two representative volume elements were established to depict the void distribution at various stages of its evolution. It is evident that in the initial phases of void evolution, the hydrogen-induced softening effect facilitates crack propagation deep within the zirconium alloy cladding. Moreover, as void evolution progresses into the second stage, this effect intensifies the incidence of localized damage at the narrow inter-void ligaments.

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锆合金包层中氢扩散的直接 FE2 多尺度模拟

本研究利用直接 FE2 多尺度模拟技术，提出了一种分析锆合金包层中氢扩散的创新方法。该方法利用降尺度规则和缩放因子，将两个尺度的有限元模拟结合到一个整体框架中。通过研究发现，空隙会引起晶格氢的非均匀扩散，这表明捕获浓度与微观结构之间存在很强的相关性。此外，滞留氢的积累会导致局部塑性变形和有效扩散率的降低。此外，还建立了两个具有代表性的体积元素，以描述不同演变阶段的空隙分布。很明显，在空隙演化的初始阶段，氢引起的软化效应会促进裂纹在锆合金包层深处扩展。此外，随着空隙演化进入第二阶段，这种效应会加剧狭窄空隙间韧带的局部损伤。

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来源期刊

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics