Understanding and designing for damping in composite laminates has become a topic of great interest; unfortunately, only limited viscoelastic property data is presently available. Direct experimental measurement of the three-dimensional viscoelastic properties is not simple to implement and, thus, an approach leading to the complete 3-D viscoelastic characterization using a reduced number of measured parameters is desirable. To address the difficulties related to direct measurement of properties, this work proposes a reduced number of material coefficients, which allow the specification of the viscoelastic constitutive relationships for a transversely isotropic material, based on only five independent dynamic stiffness parameters and three independent damping loss factors. Further, using this model, a method is developed, based on energy equations, which allows the viscoelastic properties to be evaluated from experimental data, collected from three bend-beam oscillatory tests and two measured Poisson’s ratios. The approach is validated through the use of both published data and an experimental investigation conducted using a Dynamic Mechanical Analyzer.
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