Structural Piezoelectric Single Crystal Array Networks (Structural P-SCAN)
Abstract
Experimental verification of enhanced passive mechanical damping as derived from ferroelectric-embedded particulates within a metal matrix composite has been demonstrated. Specifically, experimental results indicate relatively high damping is exhibited by composites containing a discontinuous dispersion of ferroelectric (tetragonal) BaTiO(sub 3) particulate; damping capability is reduced as temperature increases and a transformation to a cubic form occurs. Experiments performed at the Los Alamos Neutron Science Center (LANSCe) indicate that the mechanism of damping is associated with ferroelectric domain rotation that occurs in response to external stress. Early results additionally indicated that the stability of tetragonal form of BaTiO(sub 3) is very sensitive to a variety of processing-related factors serve to limit the processing options available to synthesize the composite. Processing studies that examined the influence of ferroelectric particle size, interfacial strength, and composite processing methodology were performed. Overall, results indicate a potential for effective multifunctional (strengthening plus damping) behavior by ferroelectric reinforcement strategies provided that the tetragonal form of the particulate can be maintained through processing. Further, the mechanisms of enhanced damping and strengthening should be directly extendable to reinforcement by shape memory alloys (SMA), since both involve energy absorption by the activation of certain crystallographic translations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2006
- Accession Number
- ADA447243
Entities
People
- S. L. Kampe
Organizations
- Virginia Tech