Three-Dimensional Imaging of Complex Materials and Systems
Abstract
An optical system for measuring the time-dependent displacements and strains at millions of points on a surface will provide critical data for a diverse portfolio of projects attempting to create, test, and model the responses of complex materials and systems. The system employs two video cameras, each with a maximum resolution of 3.1 megapixels at over 8,500 frames per second.Digital image correlation software is used to estimate displacements and strains from the images, creating three-dimensional movies that are comparable to those produced by finite element analysis. The system is able to image structures ranging from 30 millimeters to 10 meters in size. The systemwill be purchased from a woman-owned small business in the United States. It will be critically valuable for several existing projects and likely to inspire several more given the intense interest in understanding the dynamics of new materials with engineered microstructures. The first project, funded by ONR, will use the proposed instrumentation to develop materials with tunable propertiesby saturating open cell metallic foams with viscous liquids. In such systems, vibration of the light but stiff metallic foam produces oscillating flow of the saturating liquid through the foams pores, thus creating high levels of viscous damping. The proposed instrumentation is the only accurate means for measuring the dynamics of the foam microstructures and saturating liquids. A second project, funded by ONR, is focused on testing and modeling materials with significant hysteresis. The proposed instrumentation is necessary to measure the transient effects of hysteresis on complex systems of interest to the Navy. A third project, funded by Google, will use this instrumentation toconduct autonomous design of tough materials. This project is centered around the combination of 3D printing, autonomous testing, and machine learning as a path to realizing structures with high mechanical toughness. The proposed instrument will allow much more detailed information to be collected either as part of the optimization process or as a means of understanding the behaviorof optimized structures. The proposed instrumentation will also be heavily used in the education of our undergraduate and graduate students, presenting full three-dimensional movies of real-life structures excited by sound and vibration. The proposed instrumentation will complement existing facilities for fabricating and testing materials and structures.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 08, 2020
- Source ID
- N000141912303
Entities
People
- James Mcdaniel
Organizations
- Boston University
- Office of Naval Research
- United States Navy