Title

Dynamic Compressive Behavior of Crosslinked Silica Aerogels

Abstract

Aerogels are low-density, highly nano-porous materials. Their engineering applications are limited due to their brittleness and hydrophilicity. Recently, a strong lightweight crosslinked silica aerogel has been developed by encapsulating the skeletal framework of amine-modified silica aerogels with polyurea. The conformal polymer coating preserves the mesoporous structure of the underlying silica framework, and the thermal conductivity remains low at 0.041±0.001 W m -1K -1. Characterization has been conducted on the thermal, physical properties and the mechanical properties under quasi-static loading conditions. In this paper, we present results on the dynamic compressive behavior of the crosslinked silica aerogel (CSA) using a split Hopkinson pressure bar (SHPB). The stress-strain relation is determined at high strain rates. The deformation and failure behaviors of the CSA are observed with a high-speed camera. The dynamic mechanical behavior of the CSA are discussed and compared with results from quasi-static experiments.

Department(s)

Chemistry

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 Society for Experimental Mechanics, All rights reserved.

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