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A stochastic material model to describe continuous mode conversion
Author(s) -
Zimmermann Eugen,
Lammering Rolf,
Eremin Artem
Publication year - 2019
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201900321
Subject(s) - mode (computer interface) , context (archaeology) , materials science , bounded function , obstacle , mechanics , work (physics) , equilibrium mode distribution , matrix (chemical analysis) , fiber , optics , composite material , physics , computer science , mathematical analysis , mathematics , geology , thermodynamics , polarization maintaining optical fiber , paleontology , fiber optic sensor , political science , law , operating system
Abstract Deterministic material models are not able to comprehensively describe phenomena observed in experiments. The continuous mode conversion (CMC) of propagating waves in carbon fiber reinforced plastic (CFRP) plates is an example of this. The mechanism is similar to the conversion in the presence of defects. If a symmetrical mode while propagating through a plate‐like structure encounters a damage, which is non‐symmetric with respect to the waveguide thickness, the symmetrical mode converts into an asymmetric mode at the obstacle. The conversion is usually bounded to the location of the obstacle. In contrast, the CMC occurs even in damage free CFRP structures and manifests itself in conversion taking place permanently or continuously. The reason for this phenomenon is the irregular distribution of fiber and matrix material. With the extension to the stochastic context, it is possible to work out an enhanced material model which is able to reproduce the observed wave behaviour.