Mitigating Stress Waves Using Nanofoams and Nanohoneycombs
Abstract
(1) In the past 10 months, we conducted quasi-static shear tests and SHB dynamic tests on single-parameter silica foam samples. The testing data showed consistent correlation between the cell size and the transmitted pulse pressure and energy: Reducing cell size to below 100-200 nm has a significant beneficial effect on promoting energy absorption. To achieve the above result, we also (2) Further improved the SHB testing system, and developed single-pulse momentum trapper; (3) Developed a quantitative SEM image analysis technique to precisely identify shear bands, compression zones, and undamaged zones in tested samples. (4) Synthesized two-parameter silica foam samples, with the cell size ranging from tens of nm to a few micrometers and the porosity ranging from approximately 60% to approximately 80%. (5) Performed quasi-static shear tests and SHB dynamic tests on two-parameter silica foam samples. The testing data, although interesting, are non-conclusive, as the influences of cell size and porosity cannot be separately analyzed. (6) Developed new approaches and synthesized one-parameter silica foam samples, which had nearly identical porosity but different cell sizes from tens of nm to more than 1 micro meters. (7) Quantitative SEM image analysis of one-parameter samples is being performed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 16, 2014
- Accession Number
- ADA623574
Entities
People
- Yu Qiao
Organizations
- University of California, San Diego