Abstract
The solution is based on small deflection theory, and it is assumed that the stresses are always below the proportional limit. The material for both the faces and the core is considered isotropic. Three equations of equilibrium, derived by means of the principle of virtual displacements, form the starting point of the theory. The equilibrium equations are partial linear differential equations with constant coefficients—two are of the second order, and the third is of the fourth order. Both the equations of equilibrium and 16 boundary conditions are satisfied identically.
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