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1
Content available remote Zasada wzajemności w elektrostrykcji
Wyrwał J.
Roczniki Inżynierii Budowlanej
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2013
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z. 13
57--62
EN
The paper contains derivation of reciprocity principle for boundary problem of electrostriction. The results obtained in this work can become the theoretical basis to formulate the numerical solutions of different scientific and engineering problems connected with electrostrictive materials.
2
Content available remote Zasada wariacyjna elektrostrykcji
Wyrwał J.
Roczniki Inżynierii Budowlanej
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2013
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z. 13
7--12
EN
The paper shows how to transform a given nonlinear boundary problem of electrostriction into a variational formulation. A sufficient condition for the construction of variational principle is formulated in the theorem of VAINBERG. The results obtained in this work can become the theoretical basis to formulate the numerical solutions of different scientific and engineering problems connected with electrostrictive materials.
3
Content available remote Electrostriction and electromechanical coupling in elastic dielectrics at nanometric interfaces
Thakur O. P., Kumar Singh A.
Materials Science Poland
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2009
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Vol. 27, No. 3
839--850
EN
Electrostrictive coefficients, expressed in terms of dielectric parameters and elastic constants, are obtained for elastic dielectrics. In most of the recent experiments concerning determination of electrostrictive parameters in elastic dielectrics, several researchers used incorrect equations without considering the contribution from the edge effect, the shear stresses and suitable boundary conditions. This led to wrong predictions of experimental results particularly for materials with high Poisson ratios. Errors in the estimation of induced strains, varying from an underestimation of 202% to an overestimation of 168%, have been pointed out in the case of polycarbonate (PC). However, the contribution from the boundary conditions is very difficult to predict correctly and hence it is still unresolved. The electromechanical properties of the nanometric interface are also discussed. Due to significant electrostrictive and piezoelectric characteristics of the nanometric interface, PC has a great potential for electromechanical applications as electromechanical transducers, sensors and actuators.
4
Content available remote Gigantyczna elektro - i magnetostrykcja porowatego kompozytu elektromagnetoreologicznego
Bednarek S.
Przegląd Elektrotechniczny
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2007
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R. 83, nr 10
23-27
PL
Opisano sposób wytwarzania elastycznego kompozytu zawierającego cząstki żelaza oraz tytanianu baru rozproszone w porowatej matrycy silikonowej. Zbadano elektrostrykcję próbek tego kompozytu w polu elektrycznym o maksymalnym natężeniu 1,5 . 106 V/m. Przeprowadzono również badania magnetostrykcji w polu magnetycznym o maksymalnej indukcji 1T. Stwierdzono dużą elektrostrykcję i magnetostrykcję próbek zależną od natężenia i indukcji pola oraz od współczynników wypełnienia i porowatości. Maksymalne wydłużenie osiągnęło wartość 1,59 %.
EN
The production method of the elastic composite containing ferrous particle and titanium barium particle dispersed In porous silicone matrix is described in this article. Elektrostriction of the composite samples in electric field with maximal intensity of 1,5 . 106V/m was studied. Magnetostriction in the magnetic field with maximal induction 1 T was also investigated. Great electrostriction and magnetostriction depended from intensity, induction and filing factor was detected. The maximal elongation achieve 1,59%.
5
Content available remote Influence of electrostriction on state and continuity equations
Sawicki J. M.
Archives of Hydro-Engineering and Environmental Mechanics
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1999
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Vol. 46, nr 1-4
91-103
EN
The electrostriction consists in the change of the solvent density, due to the presence of dissolved substance. This phenomenon has very important consequences for the state equation. The paper is devoted to the analysis of these consequences and to the formulation of the full equation of state and its simplified versions, after the neglect of electrostriction. In the next order the equations of continuity of the solution and its components were considered. As a result the simplified versions of these equations were derived, rejecting the electrostriction and correcting the definition of the solution advection velocity.
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