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arXiv 0909.2950cond-mat.mtrl-sciphysics.chem-ph
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固-气反应体系中氧扩散、化学反应和机械应力耦合机理的理论研究

Theoretical Study of Coupling Mechanisms between Oxygen Diffusion, Chemical Reaction, Mechanical Stresses in a Solid-Gas Reactive System

Nicolas Creton, Virgil Optasanu, Tony Montesin, Sébastien Garruchet

摘要:

本文提供了一个研究的氧溶解到固体,其后果的材料的机械性能。事实上,机械应变强烈地影响氧化过程,并且在某些材料中可能是开裂的原因。为了实现这一研究,机械的考虑被引入到经典的扩散定律。模拟了二氧化铀的特殊情况,它经历了化学碎裂。根据我们的模拟,压缩应力场到氧化的UO 2化合物的内部界面附近的假设是一致的氧化实验观察到的一些氧化机制。更一般地说,这项工作将扩展到金属衬底上的氧化物层生长的模拟。

英文摘要:

This paper offers a study of oxygen dissolution into a solid, and its consequences on the mechanical behaviour of the material. In fact, mechanical strains strongly influence the oxidation processes and may be, in some materials, responsible for cracking. To realize this study, mechanical considerations are introduced into the classical diffusion laws. Simulations were made for the particular case of uranium dioxide, which undergoes the chemical fragmentation. According to our simulations, the hypothesis of a compression stress field into the oxidised UO2 compound near the internal interface is consistent with some oxidation mechanisms of oxidation experimentally observed. More generally, this work will be extended to the simulation to an oxide layer growth on a metallic substrate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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