Abstract
Polyurea and polyurea-based composite materials are widely used due to their excellent mechanical properties. In order to facilitate large-scale computational studies for this group of materials, a robust and standard method is needed to extract their viscoelastic constitutive parameters. In this study, frequency-domain master curves which cover a wide range of frequencies are developed using the data of dynamic mechanical analysis through time-temperature superposition (TTS). The quality of the master curves is assessed both by Kramers-Kronig relations and by comparing with the ultrasonic wave testing data. Then the time-domain relaxation modulus is obtained by the high-resolution Prony series approximated from the relaxation spectrum. To reduce computational cost, 4 to 8-term Prony series are then fitted from the time-domain relaxation modulus for a limited frequency range of interest. Both the high and low-resolution Prony series are converted back to frequency domain to compare with the master curves developed by TTS and show good agreements. This method is not limited to polyurea and polyurea-based composites and it can be applied to other similar polymer systems as well.
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Acknowledgement
This work has been supported by the Office of Naval Research (ONR) grant N00014-09-1-1126 to the University of California, San Diego, and also ONR grant N00014-13-1-0392 to the University of Massachusetts, Lowell.
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© 2016 The Society for Experimental Mechanics, Inc.
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Jia, Z., Amirkhizi, A.V., Nantasetphong, W., Nemat-Nasser, S. (2016). Determining the Shear Relaxation Modulus and Constitutive Models for Polyurea and Polyurea-Based Composite Materials from Dynamic Mechanical Testing Data. In: Ralph, C., Silberstein, M., Thakre, P., Singh, R. (eds) Mechanics of Composite and Multi-functional Materials, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-21762-8_42
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DOI: https://doi.org/10.1007/978-3-319-21762-8_42
Publisher Name: Springer, Cham
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