Mitigating Stress Waves by using Nanofoams and Nanohoneycombs
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 m/s; 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 13, 2015
- Accession Number
- ADA626076
Entities
People
- Yu Qiao
Organizations
- University of California, San Diego