扭曲带的可曲性参数,用于描述纵向纹,并划分接近值的模式
Madelyn Leembruggen1, Jovana Andrejevic2, Arshad Kudrolli3
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Physical review. E
|June 22, 2024
概括
研究人员开发了一种新的可曲性参数,用于预测薄,扭曲的带中的纹. 这个参数简化了数据分析,并准确地描述了各种纹类型的纹行为.
科学领域:
- 材料科学 材料科学 材料科学
- 固体力学 固体力学是什么
- 软物质物理学 软物质物理学
背景情况:
- 薄膜和带的纹是一种常见的现象,在各种领域都有影响.
- 了解影响纹形成的因素,如材料特性和施加的应力,对于控制表面不稳定性至关重要.
- 现有的模型往往需要复杂的参数化,这限制了它们对扭曲带几何学的预测能力.
研究的目的:
- 介绍一个新的无维参数,可曲性 (ε−1),用于描述薄,扭曲的带的纹行为.
- 为了证明这个参数在巩固与纹发作,波长和应力相关的实验和模拟数据中的实用性.
- 建立明确的标准来区分高度和中度曲的带样.
主要方法:
- 开发了一个无维的可曲性参数, ε−1 = [(h/W) 2T−1]−1,其中h是厚度,W是宽度,T是张力应变.
- 对薄,扭曲的带的模拟数据的分析,以评估纹特征与曲性参数的依赖性.
- 识别缩放关系来描述纵向纹在一系列模拟的带属性.
主要成果:
- 曲性参数 (ε−1) 有效地对纹发作,波长,临界应力和残余应力的数据进行了崩.
- 长度纹被证明主要取决于可曲性参数.
- 在高度可曲的 (ε−1 > 20) 和适度可曲的 (ε−1 ∈ (0, 20)) 带模式之间做出了明确的区别.
- 识别的缩放关系准确地描述了所有模拟带的纵向纹.
- 在高度曲的模式下,模拟验证了理论上关于纹发作和波长的近值预测.
结论:
- 拟议的可曲性参数提供了一个统一的框架,用于理解和预测薄,扭曲的带中的纹.
- 这个参数简化了对纹现象的分析,并允许对材料行为进行分类.
- 这些发现为设计和制造具有受控表面不稳定的结构提供了宝贵的见解,特别是在微电子和灵活设备方面.
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