A method for identification of the elastic and damping properties of soft materials in tension–compression and shear in a composition with a rigid (base) material is proposed. The method is based on the analysis of the lowest free vibration frequencies and amplitude dependences of internal damping parameters of three-layer test specimens of an appropriate structure: the base material is placed in the middle of the specimens for tension–compression, but as outer layers for shear. Identification of the elastic properties in tension−compression and shear is based on a comparison of calculated and experimental frequencies of corresponding test specimens. It is shown that the elastic properties found for a technical rubber depends on vibration frequencies of the test specimen. A quadratic functional containing experimental and calculated parameters of internal damping of test specimens is employed to identify the damping properties of soft materials. A three-layer finite element developed for this purpose is proposed for a numerical evaluation of the design parameters of internal damping of a three-layer test specimen. Calculations were carried out to identify the damping characteristics of the technical rubber in tension–compression and shear from the parameters of internal damping of test specimens with a D16AT aluminum alloy as the base material.
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This research is performed according to a grant of the Russian Scientific Fond (project No. 14-19-00667).
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 52, No. 4, pp. 615-644 , July-August, 2016.
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Paimushin, V.N., Firsov, V.A., Gyunal, I. et al. Identification of the Elastic and Damping Characteristics of Soft Materials Based on the Analysis of Damped Flexural Vibrations of Test Specimens. Mech Compos Mater 52, 435–454 (2016). https://doi.org/10.1007/s11029-016-9596-x
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DOI: https://doi.org/10.1007/s11029-016-9596-x