Origami Inspired Mechanics: Measuring Modulus and Force Recovery with Bent Polymer Films

Elder, Theresa; Rozairo, Damith; Croll, Andrew B.

doi:10.1021/acs.macromol.8b02002

Cited by 18 publications

(20 citation statements)

References 65 publications

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“…[9] It is interesting that the exponents measured for the simulated self-avoiding sheet, when input into the dimensional scaling, implies only a single bend is present (scaling as F ∼ Eh 3 L/H 2 ). [19] The exponents reported in this letter do not agree with the existing predictions. The exponents measured for the PDMS films (adhesive and non-adhesive) do closely match the ridge-model exponent of −8/3, however, comparing the amplitude (F 0 ) yields only weak correlation and several orders of magnitude error in scale (see [12]).…”

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confidence: 66%

The Role of Adhesion in the Mechanics of Crumpled Polymer Films

Croll¹,

Twohig²,

Elder³

2018

Preprint

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Crumpling of a thin film leads to a unique stiff yet lightweight structure. The stiffness has been attributed to a complex interplay between four basic elements -smooth bends, sharp folds, localized points (developable cones), and stretching ridges -yet rigorous models of the structure are not yet available. In this letter we show that adhesion, the attraction between surfaces within the crumpled structure, is an important yet overlooked contributer to the overall strength of a crumpled film. Specifically, we conduct experiments with two different polymer films and compare the role of plastic deformation, elastic deformation and adhesion in crumpling. We use an empirical model to capture the behaviour quantitatively, and use the model to show that adhesion leads to an order of magnitude increase in "effective" modulus. Going beyond statics, we additionally conduct force recovery experiments. We show that once adhesion is accounted for, plastic and elastic crumpled films recover logarithmically. The time constants measured through crumpling, interpreted with our model, show an identical distribution as do the base materials measured in more conventional geometries.

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confidence: 66%

The Role of Adhesion in the Mechanics of Crumpled Polymer Films

Croll¹,

Twohig²,

Elder³

2018

Preprint

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“…Vliegenthart and Gompper using a mesh of spring-linked nodes and a dimensional argument found an exponent of ~14/9 with phantom sheets (matching the ridge model) but a value of ~2 with more realistic self-avoiding sheets 22 . It is interesting that the exponents measured for the simulated self-avoiding sheet, when input into the dimensional scaling, implies that a single effective bend is dominant (as a single bend scales as ) 20 .…”

Section: Resultsmentioning

confidence: 99%

“…In this manuscript, we discuss experiments designed to unambiguously determine the force response of crumpled materials and to clarify which underlying structures dominate. The experiments use thin films created with a range of thicknesses (from 100 nm to 1 mm) from two very different but well-characterized polymeric materials, namely, polycarbonate (PC), a glassy polymer with a modulus of 1.6 GPa and polydimethylsiloxane (PDMS), an elastomer with a modulus of 1.69 MPa 20 . To simplify the results presented here, the PDMS is additionally treated to reduce its adhesion.…”

Section: Introductionmentioning

confidence: 99%

The compressive strength of crumpled matter

2019

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Crumpling a sheet creates a unique, stiff and lightweight structure. Use of crumples in engineering design is limited because there are not simple, physically motivated structure-property relations available for crumpled materials; one cannot trust a crumple. On the contrary, we demonstrate that an empirical model reliably predicts the reaction of a crumpled sheet to a compressive force. Experiments show that the prediction is quantitative over 50 orders of magnitude in force, for purely elastic and highly plastic polymer films. Our data does not match recent theoretical predictions based on the dominance of building-block structures (bends, folds, d-cones, and ridges). However, by directly measuring substructures, we show clearly that the bending in the stretching ridge is responsible for the strength of both elastic and plastic crumples. Our simple, predictive model may open the door to the engineering use of a vast range of materials in this state of crumpled matter.

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“…Among them, with the new manufacturing methods, the folded cores are more promising to be employed [17]. Origami, the ancient art of paper folding, has inspired the design of engineering devices and structures for decades [18,19]. Rigid origami, as one of the subdisciplines of origami, considers creases as hinges and the material between creases as rigid, restricting it from bending or deforming during folding [20,21].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Origami-Inspired Orthopyramid-Like Core Panel for Load Damping

Feng

Gao

et al. 2019

Applied Sciences

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Core panels inspired by origami have the advantages of force allocation and energy dissipation. Used as a sandwich core, the three-dimensional panels could be created using various origami patterns. The panel is composed of the element whose structure is inspired by origami. The orthopyramid-like origami element has a tip of joined-together side triangles. Through shape deformation, it could exhibit potential mechanical performances. Owing to its deformation when collision occurs, the structure could be employed for load damping conditions. This study focuses on nine different orthopyramid-like core panels through changing the similarity parameter value and the number of edges. The experiment and numerical simulation of compression and impact tests are carried out to perform the parametric study on the influences of the similarity parameter and the number of edges. The results show that with the increase of these two parameters, the panel tends to be softer, greatly influencing the load damping ability. Moreover, the structure parameters are optimized by the Genetic Algorithm integrated with the finite element analysis model.

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Origami Inspired Mechanics: Measuring Modulus and Force Recovery with Bent Polymer Films

Cited by 18 publications

References 65 publications

The Role of Adhesion in the Mechanics of Crumpled Polymer Films

The Role of Adhesion in the Mechanics of Crumpled Polymer Films

The compressive strength of crumpled matter

Design and Optimization of Origami-Inspired Orthopyramid-Like Core Panel for Load Damping

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