Abstract
This paper presents an analytical solution for two-dimensional heterogeneous materials containing nano-fibers or pores, taking into account the Steigmann-Ogden elastic surface under far-field loading. The solution is validated against numerical results from the complex function method in recent literature, and the closed-form expressions for specific displacement and stress fields are provided. The effects of surface elasticity parameters, surface residual stress, fiber/pore size, and far-field load on local stress distribution are numerically investigated. Results show that surface elasticity parameters can disturb internal stresses within the fiber domain, while surface bending stiffness parameters significantly impact stress concentrations, which is different from the uniform stress distribution in the classical Eshelby problem. The analytical expressions reveal interesting phenomena, e.g., the stress/displacement fields of fiber composites under hydrostatic load are only related to the surface Lamé parameters, and the non-constant coefficient in the analytical expression under shear load is kept twice of that under uniaxial tensile load, which are first reported in this paper. The developed solution is crucial for accurately capturing the mechanical responses of nanocomposites with significant surface effects.
摘要
本文给出了含有纳米纤维或孔隙的二维异质材料在远场载荷作用下的Steigmann-Ogden弹性面的解析解. 该求解与最近文献中 复函数法的数值结果进行了验证, 并提供了具体位移和应力场的闭式表达式. 数值研究了表面弹性参数、表面残余应力、纤维/孔径和 远场载荷对局部应力分布的影响. 结果表明, 表面弹性参数会扰乱纤维域内的内应力, 而表面弯曲刚度参数会显著影响应力集中, 这与 经典Eshelby问题中的均匀应力分布不同. 分析表达式揭示了一些有趣的现象, 例如, 纤维复合材料在静水载荷作用下的应力/位移场仅 与表面Lamé参数有关, 剪切载荷作用下分析表达式中的非常数系数保持为单轴拉伸载荷作用下的两倍, 这些都是本文首次报道的. 所 建立的解决方案对于准确捕捉具有显著表面效应的纳米复合材料的力学响应至关重要.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 12002303), the National Key Research and Development Program of China (Grant No. 2020YFA0711700), ZJU-ZCCC Institute of Collaborative Innovation (Grant No. ZDJG2021002), and the Scientific Research Program of the Department of Education of Hunan Province, China (Grant No. 22B0022).
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Author contributionsGuannan Wang and Mengyuan Gao designed the research. Mengyuan Gao and Guannan Wang wrote the first draft of the manuscript. Ougbe Anselme Ahehehinnou helped organize the manuscript. Guannan Wang and Zhelong He revised and edited the final version.
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Gao, M., He, Z., Ahehehinnou, O.A. et al. Far-field analytical solution of composite materials considering steigmann-ogden surface. Acta Mech. Sin. 40, 123196 (2024). https://doi.org/10.1007/s10409-023-23196-x
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DOI: https://doi.org/10.1007/s10409-023-23196-x