Page 22 - ASME SMASIS 2015 Program
P. 22
Awards
vehicles, also known as ornithopters, are used as a case study in this paper
to test the accuracy of the design optimization procedure and to prove the
eicacy of the compliant spine design. the optimal compliant spine designs
obtained from the optimization procedure are fabricated, integrated into the
ornithopter’s wing leading edge spar, and light tested. results from the
light tests prove the ability of the compliant spine to produce an asymmetry
in the ornithopter’s wing kinematics during the up and down strokes.
2015 Best Paper in Materials and Material Systems
s. ahmed, Z ounaies, and m frecker, “Investigating the performance and
properties of dielectric elastomer actuators as a potential means to
actuate origami structures”, smart materials and structures, 23, 2014.
Saad Ahmed
the pennsylvania state university
Zoubeida Ounaies
the pennsylvania state university
Mary Frecker
the pennsylvania state university
Abstract
origami engineering aims to combine origami principles with advanced
materials to yield active origami shapes, which fold and unfold in response
to external stimuli. this paper explores the potential and limitations of
dielectric elastomers (des) as the enabling material in active origami
engineering. des are compliant materials in which the coupled electro-me-
chanical actuation takes advantage of their low modulus and high
breakdown strength. until recently, prestraining of relatively thick de
materials was necessary in order to achieve the high electric ields needed
to trigger electrostatic actuation without inducing a dielectric breakdown.
Although prestrain improves the breakdown strength of the de ilms and
reduces the voltage required for actuation, the need for a solid frame to
retain the prestrain state is a limitation for the practical implementation of
des, especially for active origami structures. However, the recent
availability of thinner de materials (50 μm, 130 μm, 260 μm) has made des
a likely medium for active origami. In this work, the folding and unfolding of
de multilayered structures, along with the realization of origami-inspired
3d shapes, are explored. In addition, an exhaustive study on the funda-
mentals of de actuation is done by directly investigating the thickness
actuation mechanism and comparing their performance using diferent
electrode types. finally, changes in dielectric permittivity as a function of
strain, electrode type and applied electric ield are assessed and analyzed.
22 these fundamental studies are key to obtaining more dramatic folding and
to realizing active origami structures using de materials.
vehicles, also known as ornithopters, are used as a case study in this paper
to test the accuracy of the design optimization procedure and to prove the
eicacy of the compliant spine design. the optimal compliant spine designs
obtained from the optimization procedure are fabricated, integrated into the
ornithopter’s wing leading edge spar, and light tested. results from the
light tests prove the ability of the compliant spine to produce an asymmetry
in the ornithopter’s wing kinematics during the up and down strokes.
2015 Best Paper in Materials and Material Systems
s. ahmed, Z ounaies, and m frecker, “Investigating the performance and
properties of dielectric elastomer actuators as a potential means to
actuate origami structures”, smart materials and structures, 23, 2014.
Saad Ahmed
the pennsylvania state university
Zoubeida Ounaies
the pennsylvania state university
Mary Frecker
the pennsylvania state university
Abstract
origami engineering aims to combine origami principles with advanced
materials to yield active origami shapes, which fold and unfold in response
to external stimuli. this paper explores the potential and limitations of
dielectric elastomers (des) as the enabling material in active origami
engineering. des are compliant materials in which the coupled electro-me-
chanical actuation takes advantage of their low modulus and high
breakdown strength. until recently, prestraining of relatively thick de
materials was necessary in order to achieve the high electric ields needed
to trigger electrostatic actuation without inducing a dielectric breakdown.
Although prestrain improves the breakdown strength of the de ilms and
reduces the voltage required for actuation, the need for a solid frame to
retain the prestrain state is a limitation for the practical implementation of
des, especially for active origami structures. However, the recent
availability of thinner de materials (50 μm, 130 μm, 260 μm) has made des
a likely medium for active origami. In this work, the folding and unfolding of
de multilayered structures, along with the realization of origami-inspired
3d shapes, are explored. In addition, an exhaustive study on the funda-
mentals of de actuation is done by directly investigating the thickness
actuation mechanism and comparing their performance using diferent
electrode types. finally, changes in dielectric permittivity as a function of
strain, electrode type and applied electric ield are assessed and analyzed.
22 these fundamental studies are key to obtaining more dramatic folding and
to realizing active origami structures using de materials.
