Current-Dependent Dynamics of Bidirectional Self-Folding for Multi-Layer Polymers Using Local Resistive Heating

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Moataz Elsisy, Evan Poska, Moataz Abdulhafez, M. Bedewy
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引用次数: 3

Abstract

The purpose of this paper is to characterize the dynamics and direction of self-folding of pre-strained polystyrene (PSPS) and non-pre-strained styrene (NPS), which results from local shrinkage using a new process of directed self-folding of polymer sheets based on a resistively heated ribbon that is in contact with the sheets. A temperature gradient across the thickness of this shape memory polymer (SMP) sheet induces folding along the line of contact with the heating ribbon. Varying the electric current changes the degree of folding and the extent of local material flow. This method can be used to create practical three-dimensional (3D) structures. Sheets of PSPS and NPS were cut to 10 × 20 mm samples, and their folding angles were plotted with respect to time, as obtained from in situ videography. In addition, the use of polyimide tape (Kapton) was investigated for controlling the direction of self-folding. Results show that folding happens on the opposite side of the sample with respect to the tape, regardless of which side the heating ribbon is on, or whether gravity is opposing the folding direction. The results are quantitatively explained using a viscoelastic finite element model capable of describing bidirectional folds arising from the interplay between viscoelastic relaxation and strain mismatch between polystyrene and polyimide. Given the tunability of fold times and the extent of local material flow, resistive-heat-assisted folding is a promising approach for manufacturing complex 3D lightweight structures by origami engineering.
利用局部电阻加热的多层聚合物双向自折叠的电流依赖动力学
本文的目的是表征预拉伸聚苯乙烯(PSPS)和非预拉伸聚苯乙烯(NPS)的自折叠动力学和方向,这是由局部收缩引起的,采用一种新的基于电阻加热带的聚合物片材定向自折叠工艺。在这种形状记忆聚合物(SMP)薄片的厚度上有一个温度梯度,沿着与加热带的接触线产生折叠。改变电流会改变折叠的程度和局部物质流动的程度。这种方法可以用来创建实际的三维(3D)结构。将PSPS和NPS薄片切割成10 × 20 mm的样品,并绘制其折叠角度与时间的关系图,这是由原位摄像获得的。此外,还研究了聚酰亚胺带(Kapton)对自折叠方向的控制。结果表明,无论加热带在哪一侧,或者重力是否与折叠方向相反,折叠都发生在样品相对于胶带的另一侧。使用粘弹性有限元模型定量解释了结果,该模型能够描述由粘弹性松弛和聚苯乙烯和聚酰亚胺之间的应变不匹配之间的相互作用引起的双向褶皱。考虑到折叠时间的可调性和局部材料流动的程度,电阻热辅助折叠是一种很有前途的方法,可以通过折纸工程制造复杂的3D轻量化结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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