THE INSTABILITY OF THE DIFFUSION-CONTROLLED GRAIN-BOUNDARY VOID IN STRESSED SOLID

As atoms migrate along a void surface and grain-boundary, driven by various ther-modynamic forces, the grain-boundary void changes its shape and volume. When the void changes its configuration, the free energy of the system also changes. In this article, the free energy is calculated for an evolving...

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Bibliographic Details
Published in:Acta mechanica Sinica 2003-08, Vol.19 (4), p.330-339
Main Author: 王华 李中华
Format: Article
Language:English
Subjects:
不稳定性
固体力学
弹性能
表面扩散
表面能
裂纹-边界能
裂纹扩展
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Summary:As atoms migrate along a void surface and grain-boundary, driven by various ther-modynamic forces, the grain-boundary void changes its shape and volume. When the void changes its configuration, the free energy of the system also changes. In this article, the free energy is calculated for an evolving grain-boundary void filled with gas in a stressed solid. Then the instability conditions and the equilibrium shape of the void are determined as a functiofi of the grain-boundary and surface energies, the void volume, the externally applied stresses, as well as the internal pressure built up by the gas filled in the void.
ISSN:0567-7718
1614-3116
DOI:10.1007/bf02487810