Size dependent electro-elastic enhancement in geometrically anisotropic lead-free piezocomposites

摘要: Abstract Improving the performance of lead-free piezocomposites to levels state-of-the-art lead-based composites has been an important challenge in composite research. Consequently, agenda piezocomposite research identify new coupled mechanisms that can enhance piezoelectric response. One such method is tap into size-dependent flexoelectric phenomenon geometrically anisotropic structures. Numerical models which account for flexoelectricity and nonlinear effects as electrostriction are not well-developed design, current designs based on linear models. Here, we develop advanced model with electrostrictive contributions tailored obtain insights aspects enhanced response due small-size effects. design considerations, numerically demonstrate epoxy-matrix-based structured truncated pyramids, lead significant enhancements both electric field flux generation at small length scales. Particularly, show dilute inclusion concentrations, dramatic improvements nearing 150% possible. Further, enhancement sensitive packing inclusions within structure best occurring when closer inclined edges pyramids. We also structures CNT-modified matrices, produces similar case unmodified demonstrating effect operates almost independent nanoscale elastic dielectric modifications by nanotubes. Finally, establish a large range applied stresses, deviations negligible predominant mechanism piezocomposites.