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The hinged – hinged beam with additional moments of inertia at the ends was modelled by finite
element method. In the analysis, distribution of hinge’s mases were taken into account. The beam was
made of unidirectional pre-impregnate with a matrix of thermosetting epoxy resin reinforced with high-
strength R-type glass fibers. For manufacturing the composite structures of selected layers arrangement,
the autoclave technique was applied. The symmetrical as well as anti-symmetrical fiber configurations
were analyzed in layers configuration alpha(5)/0/alpha(5) and alpha(5)/0/-alpha(5), where alpha is the angle of fibers orientation related to the axis of the beam. The considered boundary conditions lead to
the nonlinear dynamic response in the vicinity of the primary resonance zones under harmonic kinematic
excitation generated in the beam’s plane of lower flexural stiffness. For selected fibers configurations,
interactions in two orthogonal flexural (flexible and stiff) and longitudinal directions and also torsion
due to beam’s span responses were analyzed. The numerical results were verified in the experimental
investigation. The dedicated setup of the beam, which allows changing the boundary conditions (masses
values and their inertia) was manufactured and then mounted on to the electromagnetic slip table.
Good agreement in the numerical and experimental results was achieved. The influence of the fibers
configuration on nonlinear behavior of the structures was observed. The research was financed within
the framework of the Lublin University of Technology - Regional Excellence Initiative project, funded
by the Polish Ministry of Science and Higher Education (contract no. 030/RID/2018/19).
