Nonstationary Effects In Asymmetric, Angle-Ply Laminated Composite Plates


The system in the title has been subjected to a parametric, nonstationary (NS) linear ν(t) = ν0+βt, and cyclic ν(t) = ν0±γsinβt excitations. The NS linear responses settle on the initial, constant values for extended values of the excitation frequencies, thus they stabilize the stationary (ST) response. This is true for the initial conditions taken on the stationary curve, and for different ply-angles. For the initial conditions (I.C.) beyond the ST plots, the NS responses stay also near the initial conditions, but they have the wavy forms, which increase slightly for the lower values of the forcing frequencies. For the cyclic parametric excitations, the NS responses are cyclic contained within the ranges of the excitation amplitudes ±β and (finite) response amplitudes above the ST initial values, raising up and down within these limits. It appears that they cover the whole area within the above described constraints. The decisive effect of the cyclic NS inputs, i.e., almost instantaneous cyclic responses replacing the ST responses regardless of the I.C. and ST responses, is a bench mark of the cyclic NS. This behavior is distinctly different from the NS cyclic responses of the composite columns.

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Publication Title

American Society of Mechanical Engineers, Design Engineering Division (Publication) DE



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Article; Proceedings Paper



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Socpus ID

0027802437 (Scopus)

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