Nonlinear models of elastomeric materials are investigated in this paper. Many of these models represent amplitude dependent stiffness and damping using nonlinear mechanisms. The fidelity of a model in representing experimental data depends greatly on the parameter identification methods used. Some approaches determine model parameters using only complex modulus data. Although these models usually capture amplitude dependent complex moduli, they do not perform well in capturing stress-strain loops due to sinusoidal loading. On the other hand, the parameters in some models are determined from stress-strain time history data. These models can predict damper behavior in the time domain except that the model parameters are dependent on amplitude and frequency. In order to describe damper behavior precisely while maintaining simplicity and efficiency, a modeling scheme for elastomeric materials is developed. When a elastomer is under cycle excitation, nonlinear stiffness and damping forces can be represented by nonlinear monotonic functions of displacement and velocity, respectively. Model parameters of both nonlinear stiffness and damping functions are determined independently from force-displacement and force-velocity diagrams due to sinusoidal loading. Experimental data is used to validate modeling results. The applicability of the model to dual frequency excitation, as typically seen in helicopters, is assessed.
Characterization and modeling of nonlinear elastomeric dampers under sinusoidal loading
2003
11 Seiten, 23 Quellen
Aufsatz (Konferenz)
Englisch
Characterization and Modeling of Nonlinear Elastomeric Dampers Under Sinusoidal Loading
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