Alexandria Digital Research Library

A hierarchical polymeric composite for energy dissipation

Author:
Bernal Ostos, Juliana
Degree Grantor:
University of California, Santa Barbara. Materials
Degree Supervisor:
Galen D. Stucky
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2013
Issued Date:
2013
Topics:
Engineering, Mechanical and Engineering, Materials Science
Keywords:
Energy dissipation
Polymer
Composite
Cellular materials
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2013
Description:

A hierarchical composite for use in energy dissipation applications has been studied. The composite is designed to combine three desirable properties: low weight, high strength and high energy absorption. This is accomplished by using two constituent materials with different cellular architectures: a periodic lattice for strength and a stochastic foam for energy absorption. The goals of the work presented here are to understand (i) how the two constituents behave on their own, and (ii) how they behave within the composite. X-ray computed microtomography was used to investigate the patial deformation of the two phases when the composite is compressed. Results from this study revealed that the foam phase stabilizes the lattices, delaying strut buckling, and increasing the flow stress of the system. The addition of foam doubles the energy absorption per unit volume of the lattice, while only increasing its density by 22%. This indicates that, under quasi-static compression, the system benefits from synergy between the two phases. This study highlights a possible route for achieving both strength and energy absorption in cellular materials.

Physical Description:
1 online resource (181 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3028pg2
ISBN:
9781303051593
Catalog System Number:
990039787680203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Juliana Bernal Ostos
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