Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N07: Buckling Instabilities of Thin Materials I
11:30 AM–2:30 PM,
Wednesday, March 8, 2023
Room: Room 130
Sponsoring
Unit:
DSOFT
Chair: Jovana Andrejevic, University of Pennsylvania
Abstract: N07.00011 : Revealing the self-similarity of creases in thin films
1:54 PM–2:06 PM
Presenter:
Yasara Dharmadasa
(University of Colorado, Boulder)
Authors:
Yasara Dharmadasa
(University of Colorado, Boulder)
Francisco Lopez Jimenez
(University of Colorado, Boulder)
A single crease can be idealized as a torque spring and hence can be characterized with two parameters: the equilibrium fold angle and the torque spring stiffness. When combined with the panel bending rigidity, we can accurately capture the macroscopic behavior of the creased sheet. We evaluate the current methods of estimating the torque stiffness which measures the variation of fold angle as a function of the crease moment. We compare the stiffness values from three different boundary conditions and discuss the best practices to minimize potential errors. Next, we introduce an alternate method to measure the torque stiffness directly from the force – extension data utilizing the self-similarity of the elastica combined with a torque spring. This method does not need to measure the crease moment or the angle which can significantly simplify the experimental setup.
Although the torque spring idealization assumes the crease to be a singular point, curvature changes over a finite length scale, which is in the order of the sheet thickness. We model the crease formation as an elastica that accounts for material plasticity, which provides an insight on the distribution of plastic curvatures that can quantify the crease length scale to its material properties and folding parameters.
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