Asymptotic analysis of nonlinear micro-film buckling

Asymptotic analysis of nonlinear micro-film buckling
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非线性微薄膜屈曲的渐近分析

DOI:
10.1007/s11431-012-4845-2
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发表时间:
2012-05
期刊:
Science China Technological Sciences
影响因子:
--
通讯作者:
王永
王永
中科院分区:
其他
文献类型:
--
作者:
王永

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微薄膜的屈曲设计在工程上有着广泛的应用前景。基片预应变、互连线屈曲幅值和临界应变是屈曲设计的重要参数。在所提出的分析中,屈曲膜形状近似描述一个三角函数和屈曲膜振幅通过最小化总应变能得到。然而,该方法只能产生非线性屈曲的一阶近似解。本文基于严格的非线性微分方程,对微薄膜屈曲变形进行了渐近分析,得到了更精确的屈曲振幅和临界应变与预应变的关系。所得结果揭示了微薄膜屈曲的非线性关系,对微薄膜的精确屈曲设计具有重要意义。
The buckling design of micro-films has various potential applications to engineering. The substrate prestrain, interconnector buckling amplitude and critical strain are important parameters for the buckling design. In the presented analysis, the buckled film shape was described approximately by a trigonometric function and the buckled film amplitude was obtained by minimizing the total strain energy. However, this method only generates the first-order approximate solution for the nonlinear buckling. In the present paper, an asymptotic analysis based on the rigorous nonlinear differential equation for the buckled micro-film deformations is proposed to obtain more accurate relationship of the buckling amplitude and critical strain to prestrain. The obtained results reveal the nonlinear relation and are significant to accurate buckling design of micro-films.
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