Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4772803
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Funding
- U.S. Army Research Laboratory
- U. S. Army Research Office [W911NF-11-1-0516]
- National Science Foundation [CMMI-1068345]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1068345] Funding Source: National Science Foundation
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Strain gradient sensing offers an alternative avenue for in-situ monitoring of onset and growth of cracks in structural health monitoring, where the strain gradient is the most sensitive measurand. In this study, flexoelectric strain gradient sensing structures using Ba0.64Sr0.36TiO3 (BST) were attached on the proximity of an open hole in an aluminum plate, to monitor strain gradient variations of the specimen under a uniaxial dynamic load. Charge outputs of the BST micro-bars showed good linearity with the average strain gradients, with a sensitivity of 88 pC m, which is in good agreement with the theoretical estimation by assuming a 30 mu m bonding thickness. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772803]
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