Experimental benchmarking and Saint-Venant type solutions of piezoelectric d15 shear and torsion transducers
Başlık çevirisi mevcut değil.
- Tez No: 542160
- Danışmanlar: Dr. MICHAEL KROMMER
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Metalurji Mühendisliği, Mechanical Engineering, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: Johannes Kepler University Linz
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 95
Özet
Özet yok.
Özet (Çeviri)
The present thesis is concerned with the experimental benchmarking and Saint-Venant type solutions of piezoelectric d15 shear and torsion transducers. The study starts with the prior experimental benchmarking that has been performed in the scope of this thesis and motivated the execution of Saint-Venant type solutions. Static d15-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, 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. Then, sensing experiments of a smart composite sandwich plate with an opposite poled (OP) piezoceramic shear-d15 core have been conducted by applying dynamic forces of different amplitude in order to analyze its performance as sensor. An experimental benchmark is also proposed for piezoelectric, direct-torsion actuation using mono-morph piezoceramic d15 shear patches. This is reached by designing and assembling an adaptive plate having two identical composite faces sandwiching a core made of connected six oppositely polarized (OP) piezoceramic d15 shear patches along the length. An electronic speckle pattern interferometry system was used to measure the static tip deflection of the adaptive sandwich composite plate that was mounted in a cantilever configuration and actuated in torsion by progressively applied voltages on the piezoceramic shear core electrode major surfaces. Then, the effective rate of twist was post-processed and proposed as an evaluation criterion for smart composites under piezoelectric torsion actuation. For the verification of the experimental results, the proposed experimental benchmark was simulated using three-dimensional piezoelectric finite elements (FE) within ABAQUS® commercial software. The comparison of the obtained experimental and simulation results showed reasonable agreement, but the slight nonlinear experimental response was not confirmed by the linear FE analysis. These experiments have led to study the exact 3D Saint-Venant type solutions for torsion transducers. From this point, the thesis is concerned with the analysis of two types of piezoelectric torsion transducers using the d15 effect of mono-morph piezoelectric materials. The first problem analyzes a bi-morph transducer made of two identical mono-morph straight rods, which are perfectly bonded to each other along their width; the polarization direction is parallel, but opposite in sign, such that the piezoelectric material parameter d15 has an opposite sign as well. The second problem sandwiches the bi-morph transducer between two identical elastic face layers. In both cases the resulting transducer represents a torsion transducer. Therefore, the electromechanically coupled problem is analyzed in the framework of St. Venant's torsion theory for straight rods taking into account the electrical problem. The results of this approach are compared to electromechanically coupled three-dimensional Finite Element computations and a very good agreement for the mechanical as well as the electrical entities is achieved; in particular for the rate of twist, the axial warping function and the sensed voltage. The study concludes with the torsion actuation experiments in order to verify the present Saint-Venant type solutions. The results of the performed torsion actuation experiments, Saint-Venant type solution and finite element computations are in good agreement. Finally dynamic sensing with piezoelectric d15 shear-mode bi-morph and torsion transducers is presented as a future perspective.
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