Noon Digital Resources
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Abstract
Random dynamic response and thermal buckling of a shape memory alloy (SMA)
hybrid composite plate subjected to combined thermal and random acoustic
loads are investigated. A nonlinear finite element model was developed using
the first order shear deformable plate theory, von Karman
strain-displacement relations, and the principle of virtual work. The
thermal load was assumed to be a steady state constant temperature
distribution, while the acoustic excitation was modeled as a white-Gaussian
pressure with zero mean and uniform magnitude over the plate surface. To
account for the nonlinear temperature-dependence of material properties, the
thermal strain was stated as an integral quantity of the thermal expansion
coefficient with respect to temperature. The static nonlinear equations of
motion are solved by Newton-Raphson iteration technique to obtain the
thermal post-buckling deflection, while the dynamic nonlinear equations of
motion were transformed to modal coordinates and solved by employing Newmark
implicit integration scheme. Finally, the critical buckling temperatures,
static thermal post-buckling deflections and the random dynamic responses of
a shape memory alloy hybrid composite plate panel are presented,
illustrating the effect of SMA fiber embeddings, sound pressure level, and
temperature rise on the panel response.
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