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In the paper entitled "Characterization of 1-3 piezoelectric polymercomposites - a numerical and analytical evaluation procedure for thickness modevibrations", the dependence of the thickness electromechanical couplingcoefficient on the aspect ratio of piezoceramic fibers is studied by finiteelement simulation for various volume fractions of piezoceramic fibers in a 1-3composite. The accuracy of the results is questionable because the boundarycondition claiming that `predefined displacements are applied perpendicularlyon $C^+$ plane on all nodes' is not suitable for the analysis of 1-3 compositewith comparatively large aspect ratio from 0.2 to 1. A discussion regardingthis problem and the suggested corrections are presented in this paper.

condensed matter physics

Discussion on `Characterization of 1-3 piezoelectric polymer composites  - a numerical and analytical evaluation procedure for thickness mode  vibrations' by C.V. Madhusudhana Rao, G. Prasad, Condens. Matter Phys., 2010,  Vol.13, No.1, 13703