在具有表面拉伸和曲刚性的纳米孔材料的宏观弹性模块上
Chenyi Zheng1, Xiangming Ge1, Weijiang Chu1
1Huadong Engineering Corporation Limited, Hangzhou, Zhejiang, 311122, China.
Scientific reports
|December 23, 2025
概括
这项研究为纳米多孔材料提供了一个新的模型,考虑了表面力学. 表面效应显著影响材料特性,特别是较小的纳米体和较高的孔隙性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 固体力学 固体力学是什么
背景情况:
- 孔隙材料的经典模型往往忽略了纳米尺度的表面效应.
- 像施泰格曼-奥格登这样的表面力学模型对于理解纳米尺度的行为至关重要.
- 纳米孔状材料由于高表面积与体积的比率,具有独特的特性.
研究的目的:
- 开发一个理论框架,用于评估纳米孔性材料的等效散体和剪模.
- 使用施泰格曼-奥格登表面力学模型将纳米级表面效应纳入.
- 分析孔隙性,纳米体尺寸和表面特性对材料模块的影响.
主要方法:
- 空间梯度的分解和应力边界条件的推导在纳米形/矩阵接口.
- 建模具有中心纳米不同质性或纳米形体的代表性体积元件 (RVE).
- 弹性理论的应用,莫里-塔纳卡均质化和施泰格曼-奥格登接口约束.
- 在纳米孔上进行数值模拟,以调查参数影响.
主要成果:
- 对于小于10nm和高孔度的纳米体,表面效应是显著的.
- 由于表面与体积的比率增加,古典预测与结果明显不同.
- 相当的散装模块是独立于水静电负荷下的表面曲模块.
- 相当的剪切模块对表面曲刚度和其他表面模块高度敏感.
结论:
- 开发的理论框架准确地捕捉了纳米孔状材料中的纳米尺度表面效应.
- 表面力学在确定纳米孔材料有效弹性模块方面发挥着至关重要的作用.
- 这些发现突出了经典模型的局限性,并强调了纳米级表面现象的重要性.
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