在机械元材料中揭示尺寸依赖性和合性质:一对应力理论视角
Shahin Eskandari1, Benyamin Shahryari1, Abdolhamid Akbarzadeh1,2
1Department of Bioresource Engineering, McGill University, Montreal, QC, H9X 3V9, Canada.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|January 3, 2024
概括
这项研究为机械元材料提出了有效的对应力理论,克服了经典理论的局限性. 新的模型准确地预测3D,2D和1D的合变形模式,帮助合理设计.
科学领域:
- 材料机械学 材料机械学
- 材料科学 材料科学 材料科学
- 超材料是指一种超材料.
背景情况:
- 经典连续理论 (CCT) 无法捕捉尺寸效应和材料特性,如性和极性.
- 一般化连续理论在机械超材料应用中面临着挑战,原因是材料系数的理解不足.
- CCT需要复杂的补充来进行2D/1D缩小,从而限制了其实际使用.
研究的目的:
- 为具有微观结构的材料开发一个一致和自给自足的有效对应力理论.
- 为了使3D,2D和1D空间中的机械元材料中的合材料属性的表征.
- 为合理设计和制造具有可编程变形的机械超材料提供框架.
主要方法:
- 增强的非对称均质化用于自下而上的方法.
- 开发有效的对应力理论,适用于3D,2D和1D材料微观结构.
- 同质化模型与详细的有限元模型和3D打印样本的实验数据进行验证.
主要成果:
- 成功描述了与轴向扭曲,剪切曲,曲扭曲和双曲率曲合器相关的材料性能.
- 通过与数值模拟和实验进行比较,证明了开发的同质化模型的准确性.
- 建立了一个强大的理论框架,用于分析机械超材料中的复杂变形行为.
结论:
- 提出的有效对应力理论克服了对微结构材料的经典连续性理论的局限性.
- 经过验证的模型为设计和分类具有量身定制的合变形的机械元材料提供了一个基准.
- 这项工作有助于制造具有可编程响应的先进机械超材料.
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