VIBRATION OF LAMINATE-FACED SANDWICH PLATE BY A NEW REFINED ELEMENT

An efficient 6-noded triangular element based on refined plate theory was developed for analysis of sandwich plates with stiff laminated face sheets and is applied to a free vibration problem in this paper. The plate theory represents parabolic through thickness variation of transverse shear stresses with continuity at the layer interfaces, which introduces discontinuity at these interfaces for the shear strains. The authors note that the plate theory requires unknowns at the reference plane only. Moreover, it ensures a shear stress-free condition at the top and bottom surfaces of the plate. Thus, the plate theory has all necessary features for an accurate modeling of laminated sandwich plates. The plate theory suffers from a problem in its finite element implementation since it requires C-sup-1 continuity of transverse displacement at the element interfaces. As very few elements based on this plate theory exist, and these possess certain disadvantages, an attempt has been made to develop this new element. It has been utilized to study some interesting problems of laminated sandwich plate.

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