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Date of Award

Spring 2007

Document Type

Thesis - Open Access

Degree Name

Master of Science in Aerospace Engineering

Department

Graduate Studies

Committee Chair

Dr. David J. Sypeck

Committee Member

Dr. Frank Radosta

Committee Member

Dr. Yi Zhao

Abstract

Cellular solids are materials whose base material does not always occupy the entire solid fraction available. A number of cellular solids can provide blast protection and absorb impact energy, but few perform well resisting blunt object (ballistic) penetration. In this thesis, a method is proposed for fabricating cellular solids from aramid-epoxy composites that can absorb impact energy and resist blunt object penetration. The aramid-epoxy samples were fabricated using wet-layup techniques, with two different styles of Kevlar 49 woven fabric in a variety of orientations. Test sample density ranged from 0.08 0.23 g/cm3. Different lamination orientations, assembly techniques, and bonding adhesives were investigated and assessed for their effect on quasi-static and dynamic crushing. A maximum plateau stress of 1.5 MPa was recorded with corresponding energy absorption of 4.2 J/g; values comparable to commercially produced metal foams. Methods for prediction of mechanical properties are presented/assessed along with suggestions for further improvements.

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