The sinus Fourier series has widely been applied for modelling the deflections of laminated and sandwich structural members within so-called exact semi-inverse approach. It was possible since functions of the series satisfy the end (edge) boundary conditions of the hinged structures. Several sinus series solutions to boundary problems for different types of the constitutive laws of the layers and for the hinged structures have been obtained by several authors. In this paper a new so-called exact solution to the static bending problem of the sandwich strip composed of isotropic layers is reported. The solution was obtained by using (probably for the first time) the cosine Fourier series within the semi-inverse approach. Due to application of the cosine series a new type of edge boundary conditions was introduced. The boundary conditions correspond with a technical solution enabling to carry the bending moment. Some numerical results predicted by the new solution are presented and compared with other corresponding results for the clamped-clamped sandwich strip.
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