Damping capacity of rods of materials with different mechanism of energy dissipation in two-frequency flexural vibrations

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1. It was discovered that superposition of vibrations in one of the first two flexural forms has a substantial effect on the damping of vibrations in the other form for specimens of the investigated materials. 2. The superposition of additional vibrations with increase of their amplitude leads basically to increased damping of the fundamental vibrations; the degree of damping depends on the mechanism of energy dissipation in the material, on the form and frequency of the superposed vibrations, and on the level of the stress amplitude of the fundamental and of the superposed vibrations. 3. Increased amplitude of the superposed vibrations for specimens of the ferromagnetic steel EI961 with pronounced magnetomechanical hysteresis, with high level of the amplitude of the fundamental vibrations, leads to an increase of the vibration decrement up to some limit that characterizes saturation of the processes of irreversible displacements of the domain boundaries, after which the vibration decrement decreases.