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Dynamic analysis of optimized two-phase auxetic structure

100%

Idczak E. , Stręk T.

Vibrations in Physical Systems

2017

tom Vol. 28

art. no. 2017003

This paper presents a dynamic analysis of earlier optimized auxetic structure. This optimization based on the distribution of two materials in such way to obtain a minimal value of Poisson’s ratio (PR), which indicates the auxetic properties. The initial optimized shape was so-called star structure, which if is made from one material has the PR close to 0.188. After optimization with the goal function of PR-minimization, the obtained value was equal to -9.5043. Then the eigenfrequencies for the optimized structure were investigated. The calculations were carried out by means of Finite Element Method (FEM). For optimization of the value of Poisson’s ratio was used algorithm MMA (Method of Moving Asymptotes). The computing of single material properties (PR, Young’s modulus, density) for the whole shape was made by means of SIMP method (Solid Isotropic Method with Penalization).

Computational modelling of vibrations transmission loss of auxetic lattice structure

100%

Idczak E. , Stręk T.

Vibrations in Physical Systems

2016

tom Vol. 27

123--128

In this article dynamical properties of auxetic lattice structures will be analysed. Auxetic structures are materials, which have negative Poisson’s ratio and some of these have got specific dynamic properties. Their dynamic behaviour in the frequency domain will be also shown in this article. The possibility of isolation of auxetics will show the factor VTL – Vibration Transmission Loss.

Wyniki leczenia choroby Hodgkina u dzieci

61%

Ploszynska A. , Celinska W. , Kapuscinska L. , Idczak E. , Wlazlowski M. , Chabior M.

Acta Biologica et Medica

1992

tom 18

51-59

Fenotyp immunologiczny a obraz kliniczny ostrych bialaczek limfoblastycznych u dzieci

51%

Ploszynska A. , Celinska W. , Zoltowska A. , Zamorska B. , Kapuscinska L. , Wlazlowski M. , Idczak E. , Chabior M.

Acta Biologica et Medica

1992

tom 18

43-50