5 Conclusion

This work proposes an approach to estimate the complex Poisson’s ratio through an indirect method. The complex modulus and the complex shear modulus were first determined by performing two different tests using a dynamic mechanical analyzer.

Afterwards, the estimates for complex Poisson’s ratio are provided by the use of the elastic-viscoelastic correspondence principle.

The complex Poisson’s ratio based on the modulus provided from DMA output software proved meaningless from the physical point of view. Therefore, the use of the shear modulus provided by DMA required a correction scale factor that was estimated using measured data provided by works found in the literature.

A key point to be emphasized is that investigations in the literature have been indicating that the viscoelastic properties provided by DMA equipment present great levels of discrepancy in scale depending on the test modality chosen for the mate- rial characterization as reported in [11, 18, 30].Therefore, based on these articles found in the literature and on the data analyzed in this work, two main points are worth to be highlighted here: (i) DMA seems to be an efficient tool aimed at exam- ining material properties for quality control, research and development, and also for the establishment of optimum processing conditions; (ii) care should be taken when comparing viscoelastic properties provided directly from DMA software that come from different test modalities inasmuch as these are possibly affected by a biased scale factor.

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Curvature Effects on Vibrational Power