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• W2321321756 abstract "This work is a continuation of our efforts to quantify the irregular scalar stress signals from the Ananthakrishna model for the Portevin--Le Chatelier instability observed under constant strain rate deformation conditions. Stress related to the spatial average of the dislocation activity is a dynamical variable that also determines the time evolution of dislocation densities. We carry out detailed investigations on the nature of spatiotemporal patterns of the model realized in the form of different types of dislocation bands seen in the entire instability domain and establish their connection to the nature of stress serrations. We then characterize the spatiotemporal dynamics of the model equations by computing the Lyapunov dimension as a function of the drive parameter. The latter scales with the system size only for low strain rates, where isolated dislocation bands are seen, and at high strain rates, where fully propagating bands are seen. At intermediate applied strain rates corresponding to the partially propagating bands, the Lyapunov dimension exhibits two distinct slopes, one for small system sizes and another for large. This feature is rationalized by demonstrating that the spatiotemporal patterns for small system sizes are altered from the partially propagating band types to isolated burst type. This in turn allows us to reconfirm that low-dimensional chaos is projected from the stress signals as long as there is a one-to-one correspondence between the bursts of dislocation bands and the stress drops. We then show that the stress signals in the regime of partially to fully propagative bands have features of extensive chaos by calculating the correlation dimension density. We also show that the correlation dimension density also depends on the system size. A number of issues related to the system size dependence of the Lyapunov dimension density and the correlation dimension density are discussed." @default.
• W2321321756 created "2016-06-24" @default.
• W2321321756 creator A5050400722 @default.
• W2321321756 creator A5054795891 @default.
• W2321321756 date "2013-05-10" @default.
• W2321321756 modified "2023-09-25" @default.
• W2321321756 title "Influence of system size on spatiotemporal dynamics of a model for plastic instability: Projecting low-dimensional and extensive chaos" @default.
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• W2321321756 doi "https://doi.org/10.1103/physreve.87.052907" @default.
• W2321321756 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23767598" @default.
• W2321321756 hasPublicationYear "2013" @default.
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