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An Identification Method for the Viscoelastic Characterization of Materials

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Abstract

A driving point dynamic load non destructive test can be used to determine the modal stiffness, damping and mass of a structure. If the constitutive equations of viscoelasticity consist of a combination of time independent elastic behavior and time dependent viscous behavior and can be modeled as a collection of spring-dashpot arrangements then the modal stiffness can be used to determine the time independent elastic behavior and the modal damping to determine the time dependent viscous behavior. Using a simple spring and dashpot in parallel model (Kelvin-Voigt), solutions for the material properties of uniform beams in axial deformation, torsion and bending will be given. For non-uniform beams, the elastic properties can be identified by the finite element method which is used to derive the equilibrium equations. The modal stiffness is used to get the zero frequency response (equivalent static response) which determines a single point in the global system flexibility matrix. The identification becomes a problem in minimizing the error norm of the equilibrium equations. Several numerical examples are presented, one of varying geometry and one of varying rigidity.

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Correspondence to David Yang .

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© 2013 The Society for Experimental Mechanics

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Yang, D. (2013). An Identification Method for the Viscoelastic Characterization of Materials. In: Antoun, B., Qi, H., Hall, R., Tandon, G., Lu, H., Lu, C. (eds) Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4241-7_7

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  • DOI: https://doi.org/10.1007/978-1-4614-4241-7_7

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4614-4240-0

  • Online ISBN: 978-1-4614-4241-7

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