收稿日期: 2009-10-16
修回日期: 2009-12-18
网络出版日期: 2010-05-15
基金资助
国家自然科学基金(10721202)资助
Effective properties of metal films during uniaxial stretching
Received date: 2009-10-16
Revised date: 2009-12-18
Online published: 2010-05-15
许巍 , 杨金水 . 金属薄膜单轴拉伸过程中的等效性能研究[J]. 中国科学院大学学报, 2010 , 27(3) : 314 -322 . DOI: 10.7523/j.issn.2095-6134.2010.3.003
This paper focuses on the variation in properties of the metal films under the conditions of uniaxial stretching. By employing the effective theories (i.e. Parallel, Maxwell, and Hashin-Shtrikman theories), cracks models are established to obtain the relation between effective electric-resistance and strain. The theoretical solutions are compared with the previous experimental results. It is shown that the Maxwell solution agrees well with the experimental results. Furthermore, the tensile strain energy method and the homogenous method could be used to estimate the effective Youngs modulus of films during the deformation, and the accuracies of the estimation are subsequently compared using the finite elements method. The results show that the homogenous method is better. Finally, the correlations of the effective electric-resistance with effective Youngs modulus and damage variable are established.
Key words： flexible electronics; metal films; cracks propagation; effective theories
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