In situ Identification of Viscoelastic Material Parameters

摘要

Experimental methods have proved to be useful tools in structural health monitoring, enabling in situ measurements of structural deformations. By proper mathematicalumerical evaluation of the measured data it is possible to identify the characteristic internal parameters and to observe their degradation at any time during the lifetime of the structures. Especially in case of the viscoelastic response of material it is quite important to have reliable information on the material parameters to assess the actual state of structures. In this concern it is described in the following, how to proceed in monitoring the time-dependent response of plates-in-bending consisting of viscoelastic material. Based on the theory of linear viscoelasticity the fundamental relationships between the displacements on the plate surface and the material parameters are presented. To perform measurements electronic speckle interferometry is applied. The application of the described process will be demonstrated by the example of a clamped plate.