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contributor authorElsisy, Moataz
contributor authorPoska, Evan
contributor authorAbdulhafez, Moataz
contributor authorBedewy, Mostafa
date accessioned2022-02-05T21:44:54Z
date available2022-02-05T21:44:54Z
date copyright2/3/2021 12:00:00 AM
date issued2021
identifier issn0094-4289
identifier othermats_143_3_031004.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4276260
description abstractThe 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.
publisherThe American Society of Mechanical Engineers (ASME)
titleCurrent-Dependent Dynamics of Bidirectional Self-Folding for Multi-Layer Polymers Using Local Resistive Heating
typeJournal Paper
journal volume143
journal issue3
journal titleJournal of Engineering Materials and Technology
identifier doi10.1115/1.4049588
journal fristpage031004-1
journal lastpage031004-10
page10
treeJournal of Engineering Materials and Technology:;2021:;volume( 143 ):;issue: 003
contenttypeFulltext


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