W20090206850 Simulation of the constitutive behavior of PZT ceramics under electromechanical loading Konstandin, Alexander The piezolectric effect couples electrical with mechanical properties of solids, so that in piezocerantic materials a mechanical deformation is converted into an electrical signal and vice versa. This principle offers a variety of applications, e. g. in the field of electrical and rnechanical engineering, acoustics, autornation, comnmnications engineering; information technolog,y and automotive engineering, wherc thcse rnaterials arc implemented in different actuator and sensor applications. A very important device is the piezoceramic stack actuator installed in injectors for engines based on the direct injection principle, where the fuel (either gasoline or diesel) is injected directly into each cylinder. Among the requirements for modern diesel engines, low fuel consumption, pollution and noise simultaneous with high responsiveness are of the greatcst importance. These requirements can only be fulfilled with a high pressure injection systern, which provides a fine spray and precise rnetering of the fuel injected as well as an exact timing of the injection. The advantages of a piezo inline injector in contrast to a magnetic injector, it can be stated that multiple injections with a flexible start and interval length are possible. Furthermore, the installation size and weight are reduced (270 g in contrast to 490 g), as well as noise, fuel consumption and emissions by 3 dB [A], 3 % and 20 % respectively. In return, the power of the engine can be increased by 7 %. Many of the applications of piezoceramics make use of PZT, a ferroelectric polycrystalline ceramic, which offers a high piezoelectric sensitivity, achieved by suitable doping. This thesis focuses on the simulation of the constitutive behavior of a PZT under electromechanical loading. It is the objective of this work to develop a finite element tool for the simulation of the quasi-static nonlinear behavior of ferroelectric materials as well as the function and operation of advanced devices, such as piezoceramic stack actuators, under electromechanical loading and isothermal conditions. This is achieved by implementing a finite element formulation of a phenomenological constitutive model for polycrystalline ferroelectrics into user defined finite elements for commercial finite elernent software.


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    Title :

    Simulation of the constitutive behavior of PZT ceramics under electromechanical loading


    Contributors:

    Publication date :

    2008


    Size :

    122 Seiten, Bilder, Tabellen, 54 Quellen



    Type of media :

    Theses


    Type of material :

    Print


    Language :

    English




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