3D nondestructive imaging techniques for mesoscale damage analysis of composite materials

Award Information
Agency:
Department of Defense
Amount:
$99,959.00
Program:
STTR
Contract:
FA8651-12-M-0200
Solitcitation Year:
2011
Solicitation Number:
2011.B
Branch:
Air Force
Award Year:
2012
Phase:
Phase I
Agency Tracking Number:
F11B-T04-0089
Solicitation Topic Code:
AF11-BT04
Small Business Information
NextGen Aeronautics
2780 Skypark Drive, Suite 400, Torrance, CA, -
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
Y
Duns:
106823607
Principal Investigator
 Stepahnie Chan
 Principal Investigator
 (310) 626-8388
 schan@nextgenaero.com
Business Contact
 Zoltan Feher
Title: Manager, Contracts and Pricing
Phone: (310) 626-8384
Email: zfeher@nextgenaero.com
Research Institution
 Arizona State University
 Sarah Gates
 PO Box 876011
Tempe, AZ, 85287-5287
 (480) 727-3745
 Nonprofit college or university
Abstract
ABSTRACT: Energetic materials may be subjected to severe environments of pressure and shear loading, causing damage that leads to premature initiation or suboptimal performance. This damage is at the mesoscale, at and below the grain size of the particles, in the range of 5-400 microns. X-ray computed microtomography is a 3D non-destructive technique that can be used for imaging this damage. It enables acquisition of valuable 3D microstructure data that can be input into damage models and simulations of fracture. We propose to capture the evolution of damage in representative composite materials, such as plastic bonded explosive simulants, through ex situ and in situ mechanical testing combined with X-ray tomography (XRT). Quantitative measurements of changes in microstructure features (such as cracks, voids, and particle shearing) during fracture will be extracted from the XRT data. Because contrast levels between particles and polymer binder are often difficult to discern, image processing and segmentation development will also be addressed. Lastly, potential damage models that incorporate the 3D microstructure data will be investigated. BENEFIT: 3D nondestructive imaging and analysis tools: o Proof of feasibility: Utilization of XRT with PBX simulant o Image segmentation development: Always a limiting step, so this will aid future efforts in moving towards automatic data processing o Method for studying damage evolution: ex situ and in situ combined mechanical and XRT experiments provide way for fabricating and studying various stages of microstructure damage. Predictive damage model, for evaluating performance o Preliminary development and validation of models that can make damage initiation and performance of energetics predictable. o Applicable to other material systems.

* information listed above is at the time of submission.

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