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Numerical Characterization of the Chaotic Nonregular Dynamics of Pseudoelastic Oscillators

Previous studies on the nonlinear dynamics of pseudoelastic oscillators showed the occurrence of chaotic responses in some ranges of the system parameters [1,2]. The restoring force was modeled by a thermomechanically consistent model with four state variables [3]. In comparison with the simpler polynomial constitutive laws considered for example in [4], the present model is characterized by more governing parameters and it is therefore interesting to understand whether nonregular responses only occur in isolated zones or are actually robust outcomes. The relevant analyses need to be carried out through some synthetic measure of non-regularity that has to be reliable and computationally simple in order to allow for systematic investigations in meaningful parameter spaces.

Whereas the numerical characterization of chaos in smooth dynamical systems is often carried out via the computation of Lyapunov exponents, in the present case the computation of such exponents, following, for example [5], does not seem to be a convenient strategy.

Keywords

Lyapunov Exponent Shape Memory Bifurcation Diagram Chaotic Motion Excitation Amplitude 
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Copyright information

© Springer Science + Business Media B.V. 2009

Authors and Affiliations

  1. 1.Dipartimento di Ingegneria Strutturale e GeotecnicaSapienza Università di RomaRomaItaly

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