naa a22 4500 510772277 CHVBK 20180411083218.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11837-012-0515-x doi (NATIONALLICENCE)springer-10.1007/s11837-012-0515-x Computational Modeling of Piezoelectric Foams [Elektronische Daten] [K. Challagulla, T. Venkatesh] Piezoelectric materials, by virtue of their unique electromechanical characteristics, have been recognized for their potential utility in many applications as sensors and actuators. However, the sensing or actuating functionality of monolithic piezoelectric materials is generally limited. The composite approach to piezoelectric materials provides a unique opportunity to access a new design space with optimal mechanical and coupled characteristics. The properties of monolithic piezoelectric materials can be enhanced via the additive approach by adding two or more constituents to create several types of piezoelectric composites or via the subtractive approach by introducing controlled porosity in the matrix materials to create porous piezoelectric materials. Such porous piezoelectrics can be tailored to demonstrate improved signal-to-noise ratio, impedance matching, and sensitivity, and thus, they can be optimized for applications such as hydrophone devices. This article captures key results from the recent developments in the field of computational modeling of novel piezoelectric foam structures. It is demonstrated that the fundamental elastic, dielectric, and piezoelectric properties of piezoelectric foam are strongly dependent on the internal structure of the foams and the material volume fraction. The highest piezoelectric coupling constants and the highest acoustic impedance are obtained in the [3-3] interconnect-free piezoelectric foam structures, while the corresponding figures of merit for the [3-1] type long-porous structure are marginally higher. Among the [3-3] type foam structures, the sparsely-packed foam structures (with longer and thicker interconnects) display higher coupling constants and acoustic impedance as compared to closepacked foam structures (with shorter and thinner interconnects). The piezoelectric charge coefficients (d h), the hydrostatic voltage coefficients (g h), and the hydrostatic figures of merit (d hgh) are observed to be significantly higher for the [3-3] type piezoelectric foam structures as compared to the [3-1] type long-porous materials, and these can be enhanced significantly by modifying the aspect ratio of the porosity in the foam structures as well. TMS, 2012 Challagulla K. Bharti School of Engineering, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON, Canada aut Venkatesh T. Department of Materials Science and Engineering, Stony Brook University, 11794-2275, Stony Brook, NY, USA aut JOM Springer US; http://www.springer-ny.com 65/2(2013-02-01), 256-266 1047-4838 65:2<256 2013 65 11837 https://doi.org/10.1007/s11837-012-0515-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-012-0515-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Challagulla K. Bharti School of Engineering, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON, Canada aut NATIONALLICENCE 700 1- Venkatesh T. Department of Materials Science and Engineering, Stony Brook University, 11794-2275, Stony Brook, NY, USA aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/2(2013-02-01), 256-266 1047-4838 65:2<256 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer