An engineering approach for the nonlinear viscoelastic characterization of elastomeric materials is presented. Main issue is the determination of a material data base appropriate for numerical simulation and finite element analysis. The time dependent nonlinear response of simple rubber-metal shear specimens to different strain controlled loading histories is modelled by use of Schapery's constitutive equation in the stress relaxation formulation. Each group of tests in the time and frequency domain is described by the same set of material parameters. A nonlinear multiresponse regression analysis is used for parameter identification in the time domain. In the frequency domain a procedure for a simultaneous fitting of storage and loss modulus with Tikhonov regularization for ill-conditioned problems is required. The validity range of the estimated material parameters is pointed out.
Elastomeric components in the helicopter industry - advances in design and performance prediction
1999
13 Seiten, 34 Quellen
Conference paper
English
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