Accession Number:

ADA626076

Title:

Mitigating Stress Waves by using Nanofoams and Nanohoneycombs

Descriptive Note:

Final rept. 5 Dec 2011-4 Dec 2014

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA

Personal Author(s):

Report Date:

2015-02-13

Pagination or Media Count:

82.0

Abstract:

In this ARO project, we had a remarkable finding In dynamic indentation test, the indentation size of a silica nanofoam was smaller than in a solid silica i.e. the former was effectively harder than the latter. All the samples were in the same amorphous silica phase the porosity of all nanofoam samples was approximately 60, and therefore, their mass density was only approximately 40 of that of solid silica. The experiment was conducted in a Split Hopkinson Bar SHB setup. A titanium striker impacted on a steel incident bar at approximately 8.5 ms the incident bar forced a hard hemispherical indenter into the silica sample. The silica sample was sandwiched in between the indenter and a steel transmitted bar.

Subject Categories:

  • Inorganic Chemistry
  • Miscellaneous Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE