表面张力对光固化微支板形状变形的影响:有限元建模

IF 2.5 3区 工程技术 Q2 MECHANICS
Lei Cai, Yan Shi, Qiang Zhang, Cunfa Gao
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引用次数: 0

摘要

基于光的3D打印技术最近被用于将水凝胶等软材料构建成复杂的结构。然而,当这些极其柔软的材料被打印成特征尺寸小到微尺度甚至纳米尺度的精细结构时,所得到的结构可能会被表面张力扭曲,当表面能超过材料的体弹性能时,表面张力就会发挥作用。为了阐明表面张力对形状畸变的基本影响,我们开发了一种有限元建模方法来研究光固化微支撑的最终形状与设计形状之间的差异。该方法依赖于连续体框架,有效地考虑了光固化过程中材料性能的演变和表面张力的作用。建模结果表明,微支撑的形状与表面张力的强度高度相关,这有时会阻碍由光聚合相关的体积收缩引起的不希望的变形。本研究可以为减少具有微纳米尺度特征的软质材料的打印形状畸变提供一些基本的认识,并有助于设计性能更好的器件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of surface tension on the shape distortion of photo-cured micro-struts: finite-element modeling

Effects of surface tension on the shape distortion of photo-cured micro-struts: finite-element modeling

Light-based 3D printing techniques have recently been used to construct soft materials like hydrogels into complex architectures. However, when these extremely soft materials are printed into fine structures with feature sizes as small as microscale or even nanoscale, the resulting structures may be distorted by surface tension, which comes into play when the surface energy exceeds the material’s bulk elastic energy. In order to elucidate the basic effects of surface tension on shape distortion, we here develop a finite-element modeling method to study the difference between the resulting shape and designed shape of a photo-cured micro-strut. This method relies on a continuum framework that efficiently considers the evolution of material properties and the action of surface tension during the photo-curing process. The modeling results show that the resulting shape of the micro-strut is highly correlated with the strength of the surface tension, which can sometimes hinder the undesired deformation caused by the volume shrinkage associated with photo-polymerization. This study can provide some basic understanding for the reduction of shape distortion in printing soft materials with microscale and nanoscale features, and facilitate the design of devices with better performance.

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来源期刊
CiteScore
4.40
自引率
10.70%
发文量
234
审稿时长
4-8 weeks
期刊介绍: Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.
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