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Anthony G. Evans
Member of National Academy of Engineering
Departments of Mechanical Engineering and Materials
University of California at Santa Barbara
DESIGN AND DEMONSTRATION OF HIGH AUTHORITY SHAPE MORPHING STRUCTURES Abstract A high authority shape morphing plate capable of realizing large displacements while sustaining large loads is described and demonstrated. The design incorporates an active back-plane comprising a Kagome truss, capable of changing the shape of a solid face, connected to the back-plane by means of a truss core. The two shape deformations to be demonstrated consist of hinging and twisting. The design is performed by a combination of analytic estimation and numerical simulation, guided by previous assessments of the attributes of the Kagome configuration. The structure is shown to be capable of sustaining large passive loads at low weight. With presently available actuators, the authority is found to be actuator-limited. Alternative actuators demonstrate the full potential of the system. An optimization ascertains the largest displacements achievable within the force capability of the actuators. The consistency between measured and calculated responses has allowed the numerical method to be used to set objectives for alternative materials, as well as structural and actuator enhancements.
Biosketch
Professor Evans’ research has embraced a range of fundamental and
engineering issues related to the fabrication and performance of
materials for advanced thermo-structural systems. Much of the research
has been in collaboration with colleagues in solid mechanics and is
centered in the mechanics of materials area. It involves combinations
of experiment and modeling to tackle problems related to the use of
advanced materials in load bearing applications. Research articles
have addressed challenges in advanced ceramics, composites,
films/coatings and cellular materials, as well as interfaces and their
adhesion. The technologies covered include: high temperature materials
for systems such as gas turbines used for power generation and
propulsion, materials for thermal management in such diverse systems
as power electronics and engines, materials for ultralight weight
components in transportation systems, materials having especially low
weight/compactness through multifunctionality. Recent interests
include materials and systems for high authority actuation and thermal
barrier materials for gas turbines. He has published over 450
technical articles.
Prof. Evans was elected to the National Academy of Engineering in 1997. Before joining UC Santa Barbara, Evans was a professor at Harvard University and Princeton University, respectively. Prof. Evans received his Ph.D. from Imperial College in London.
Wednesday, January 19, 2005
Bourns Hall A265
10:10 a.m.-11:00 a.m.
(Refreshments will be served at 10:00 a.m.) |
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