Dynamic Compressive Behavior of Crosslinked Silica Aerogels
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.
H. Lu et al., "Dynamic Compressive Behavior of Crosslinked Silica Aerogels," Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006, Society for Experimental Mechanics, Jan 2006.
Article - Conference proceedings
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