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

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$100,000.00
Award Year:
2012
Program:
STTR
Phase:
Phase I
Contract:
FA8651-12-M-0201
Award Id:
n/a
Agency Tracking Number:
F11B-T04-0260
Solicitation Year:
2011
Solicitation Topic Code:
AF11-BT04
Solicitation Number:
2011.B
Small Business Information
2607 Bridle Lane, Walnut Creek, CA, 94596-
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
830529405
Principal Investigator:
ChiLiu
President
(408) 253-2939
liu_c_t@msn.com
Business Contact:
LouiseLiu
Financial Officer
(408) 253-2939
liu_louise@msn.com
Research Institute:
University of Texas at Dallas
Hongbing Lu
EC 38
Richardson, TX, 75080-5080
(972) 883-4647

Abstract
ABSTRACT: The main issue with the development of a reliable constitutive model for explosive materials and concretes is the lack of a fundamental understanding of the evolution of 3-D microstructure and damage in these materials when they are subjected to multi-axial loading under confinement conditions. The main technical challenges are determining the 3-D microstructure and damage evolution processes and connecting the different length scales for damage and failure analyses. The program"s basic approach involves a blend of numerical modeling and experimental studies. In Phase I, the 3-D microstructure and damage evolution processes as well as strain distributions will be determined using micro computed tomography techniques. 3-D numerical modeling analyses will be conducted to simulate damage initiation and evolution processes in a mock explosive material and concrete subjected to an incremental compressive load under a confinement condition. Constant compressive strain rate tests will be conducted on cylindrical specimens under a confinement condition. Acoustic emission techniques will be used to monitor damage processes. The data will be analyzed and the effect of strain rate on the strain distributions and damage process on the specimen surface are discussed. BENEFIT: The research conducted here will provide the designer with a reliable method with which to evaluate the structural integrity and service life of penetrators thereby resulting in significant cost savings to the government and private companies as well as provide guidance for developing new high strength PBX materials. Furthermore, the techniques and methods developed to characterize PBX materials would also be applicable to characterizing other energetic materials, solid propellants, and concrete that would be of interest to the military and weapons industries as well as pressure and temperature sensitive materials that would be of interest to the oil and mining industries and shock absorbing materials that would be of interest to the transportation industries. In addition, the developed 3-D -CT imaging techniques can be used to take images and analyze the 3-D structure of bones, teeth, lungs, etc that would be of interest to the medical field.

* information listed above is at the time of submission.

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