摘要
关注单轴拉伸条件下裂纹萌生扩展阶段的金属薄膜性能变化.通过运用Parallel、Maxwell和Hashin-Shtrikman等效理论,建立拉伸过程中金属薄膜的裂纹模型,得出了电阻值与应变的关系,并与现有实验结果进行了比较.结果表明,Maxwell等效理论条件下的理论值与实验结果吻合较好.然后运用有限元计算,比较了拉伸能量法和均匀化方法在计算等效弹性模量时的准确性,最后建立了等效电阻和等效弹性模量以及损伤变量的关联.
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 Young＇s 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 Young＇s modulus and damage variable are established.
出处
《中国科学院研究生院学报》
CAS
CSCD
北大核心
2010年第3期314-322,共9页
Journal of the Graduate School of the Chinese Academy of Sciences
基金
国家自然科学基金(10721202)资助
关键词
柔性电子
金属薄膜
裂纹扩展
等效理论
flexible electronics
metal films
cracks propagation
effective theories
