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In the present study, the grain size of various PZT ceramics was varied in a range between 300 nm and 10 microns to study their dielectric, piezoelectric and electromechanical behaviour. The performed microstructural analyzes and crystal structure studies show a significant impact of the grain size on the ferroelectric domain size and structure. As a result of this study a model for the influence of grain size on the properties of the PZT ceramics could be derived.

Ferroelektrika, Piezoelektrika, Korngröße, Domänen, elektromechanische Eigenschaften

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Soft Magnetic Composites (SMCs) typically consist of large iron particles coated with a fairly thin inorganic layer. The combination of soft particles with a brittle layer causes, however, a rather poor mechanical behaviour of the SMCs. The particle boundaries of the specific SMC Somaloy 700 3P can be classified into four different types according to the complexity of their layers. Tests on both micro- and macroscale showed that the particle-boundary interface is critical in terms of failure.

Weichmagnetische Verbundwerkstoffe, Nanoindentation, mechanische Eigenschaften, Charakterisierung,Soft magnetic composites, nanoindentation, mechanical properties, characterisation

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Die Arbeit, die sich mit der Syntax und Semantik eingebetteter finaler Infinitive des Russischen beschäftigt, ist in vier Kapitel unterteilt. Kapitel 1. Diachronische Aspekte russischer infiniter Konstruktionen mit finaler Bedeutung; Kapitel 2. Das Feld finaler Infinitiveinbettungen im modernen Russischen; Kapitel 3. Syntaktische Eigenschaften russischer finaler Infinitiveinbettungen;

Das Supinum --- Die Finalrelation --- Eigenschaften --- finale Infinitiveinbettung --- finaler --- Infinitiveinbettungen --- Junghanns --- Matrixsatz --- PP-Analyse --- russisc --- russischer --- semantische --- Syntaktische

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This work is focused on the prediction of elastic behavior of short-fiber reinforced composites by mean-field homogenization methods, which account for experimentally determined and artificially constructed microstructure data in discrete and averaged form. The predictions are compared with experimental measurements and a full-field voxel-based approach. It is investigated, whether the second-order orientation tensor delivers a sufficient microstructure description for such predictions.

Faserverstärkte Kunststoffe, Mikromechanische Modellierung, Semianalytische Homogenisierung, Elastische Eigenschaften, Orientierungstensorenfiber-reinforced composites, micromechanical modeling, semi-analytical homogenization, elastic properties, orientation tensors

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A discontinuous fiber-reinforced thermoset material produced by the Sheet Molding Compound process is investigated. Due to the process-related fiber orientation distribution, a composite with an anisotropic microstructure is created which crucially affects the mechanical properties. The central objectives are the modeling of the thermoelastic behavior of the composite accounting for the underlying microstructure, and the experimental characterization of the pure resin and the composite material.

Langfaserverstärkter Komposit, Mean- und Full-Field Homogenisierung, Thermoelastische Eigenschaften, Dynamisch-mechanische Analyse,Long fiber-reinforced composite, Mean- and full-field homogenization, Thermoelastic properties, Dynamic mechanical analysis