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[somogyi <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


                  Martina Pia Nunziata
                  (University of Salerno)


"On Thermopiezoelectricity of Nonsimple Materials"


     címmel tartandó szemináriumára.


Kivonat:



The question of the interaction of electromagnetic fields with elastic 
solids has been the subject of important investigations. Some crystals 
(such as quartz) subjected to stress, become electrically polarized 
(piezoelectric effect). Conversely, an external electromagnetic field 
produces deformation in a piezoelectric crystal. The theory of 
thermopiezoelectricity has been studied in various works. Our 
contribution on the theory of thermopiezoelectricity of a body is 
divided into two papers. In the first one, we derive a theory in which 
the second displacement gradient and the second electric potential 
gradient are included in the set of independent constitutive variables. 
This theory may be useful for starting a series of observations, 
although the number of parameters to be determined is significant and 
there is no easy way to deduce them from current experiments. We obtain 
the appropriate thermodynamic restrictions and constitutive equations, 
with the help of an entropy production inequality proposed by 
Green&Laws. In the second one, starting from the linear theory, we 
consider in particular the case of center-symmetric materials, and we 
prove a number of useful results without using the definiteness 
assumptions on internal energy and with the help of the time convolution 
product.



Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2023 március 10 péntek  d.u. 14 óra

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                             Somogyi Gábor