METHOD OF DETERMINATION OF COEFFICIENTS OF HYSTERESIS AND LINEAR VISCOUS INTERNAL IN VISCOELASTIC MATERIAL Russian patent published in 2002 - IPC

FIELD: testing and measuring technology; diagnosis of viscoelastic materials. SUBSTANCE: proposed method consists in two-stage excitation of resonance oscillations of system by compelling harmonic force; during repeated excitation, responsiveness of oscillatory system is changed; amplitude of compelling harmonic action is changed in such way that amplitude of steady induced oscillations should be constant. Every time during excitation, amplitudes of compelling action P₁ and P₂, resonance frequency ω_p1 and ω_p2, and oscillation amplitude A are recorded; coefficients of internal hysteresis friction η and linear viscous friction "b" are calculated respectively by the following formulae: and , where "k" is reduced stiffness coefficient of oscillatory system. EFFECT: enhanced accuracy of determination of mechanical properties of material under test. 2 dwg, 1 tbl