Thermal post-buckling and flutter characteristics of composite plates embedded with shape memory alloy fibers

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Thermal post-buckling and flutter characteristics of composite plates embedded with shape memory alloy fibers

Park, Jae-Sang / Kim, Ji-Hwan / Moon, Seong-Hwan

Investigated is the composite plate embedded with SMA (shape memory alloy) fibers subject to the aerodynamic and thermal loading in the supersonic region. The nonlinear finite element equations based on the FSDT (first-order shear deformation plate theory) are formulated for the laminated composite plate embedded with SMA fibers, SMA composite plate. The von Karman strain-displacement relation is used to account for the large deflection. The incremental method considering the influence of the initial deflections and initial stresses is adopted for the temperature-dependent material properties of SMA fibers and composite matrix. The first-order piston theory is used for modeling aerodynamic loads. The effect of the SMA on the critical temperature, thermal post-buckling deflection, natural frequency and critical dynamic pressure of the SMA composite plate is given. The higher the volume fraction and the initial strain of the SMA fiber are, the stiffer the plate is. The critical temperature is increased and the thermal large deflection is decreased by using the SMA fiber. In the pre-buckled region, the natural frequencies can be increased due to the recovery stress of the SMA, but in the post-buckled region, the natural frequencies of the plate with SMA are lower than those of the plate without SMA due to the increase of the weight of plate and decrease of the thermal large deflection using the SMA fiber. The flat region under the combined aerodynamic and thermal loading is expanded significantly, and the critical dynamic pressure can be increased by using SMA.