Static experimentations of the piezoceramic d₁₅-shear actuation mechanism for sandwich structures with opposite or same poled patches-assembled core and composite faces

Abstract

Static d 15 -shear actuated smart composites consisting of glass fiber/epoxy layers sandwiching piezoceramic shear patches-assembled cores were investigated experimentally and numerically. The piezoceramic cores were formed by connecting two or three patches with the same or opposite polarization directions. For each cantilevered benchmark the shear-induced transverse tip deflection, under increasing actuation voltage, ranging from 61.5 V to 198 V, was measured by an electronic speckle pattern interferometer system. The performance of the shear actuated smart composites was characterized by their shear-induced transverse deflection per length per voltage. It was found that this performance is much better at high voltages for which the response becomes nonlinear. For verification of the experimental results the proposed benchmarks were simulated within ABAQUS ® commercial code using three-dimensional piezoelectric finite elements. The comparison of the obtained experimental and simulation results show a nonlinear dependence of the transverse deflection for voltages higher than around 92 V.

Modal effective electromechanical coupling coefficient of shear-mode piezoceramic sandwich cantilevers with segmented multicore: Experimental and numerical assessments

“…Its numerical evaluations are made using FE models with (w) and without (w/o) EP constraints and w and w/o adhesive (a) bonding layers. The latter effect has been shown to be very important for shear PZT-based torsion (Berik and Benjeddou, 2010), shear (Berik and Benjeddou, 2011) static actuators, and for transverse-mode PZT transducer power and energy conversion efficiency (Moharana and Bhalla, 2015). However, its effect on the shear modal effective EMCC is explored here for the first time, as well as the segmented double core.…”

Field-dependent nonlinear piezoelectricity: a focused review

“…The displacement-voltage test-model correlation was also bad. The integration of transverse shear (d 15 )-mode piezoceramic (PZT PIC255) patches segmented layer between glass/epoxy composite faces in plate [20,21] and beam [22] smart structures has been investigated for shear [20] and torsion [21,22] actuation purposes. For each configuration, the experimental displacementvoltage relationship was found strongly nonlinear and non-catchable by linear FE models (ABAQUS® C3D20E FE), as illustrated in Figures 2, 3 and 4.…”

Piezoelectricd15shear-response-based torsion actuation mechanism: An exact 3D Saint-Venant type solution

“…The reason the exact analytical solution can be derived easily, is the fact that the eigenstrain is compatible and that no external forces act on the body. Recently, Berik and Benjeddou [28] have reported experimental and numerical results for the case when such shear actuators are used as the core of a sandwich structure.…”

“…Before we present the solutions, we reformulate the problem of Equation (28) in a form more suitable for implementing a finite difference scheme. Instead of using Dirac-delta functions on the right-hand side, we prefer to account for their effect in terms of interface conditions at I; see Figure 6.…”