Ab initio calculations are performed, using a slab model with 6 atom-layers, to investigate the character of clean surface, surface with vacancy.
利用第一性原理赝势法，采用6层原子层的层晶模型研究了完整铜表面、含空位缺陷表面的性质。
The basic idea of this new model is that cavity nucleation during creep deformation depends not only on the stress concentration of piled-up group of dislocations, but also vacancy clustering.
该模型不但考虑了位错塞和所产生的应力集中的作用，同时也考虑了空位聚集的作用。
In this article, the elastic model of lattice vacancy is critically analysed, and a general expression for the interaction energy of vacancy with an arbitrary internal stress system is given.
本文分析了点阵空位的弹性模型，给出点阵空位与任意内应力系统的相互作用能量普遍表达式。
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