Effects of Fillers on the Dynamic Properties of a High Performance Elastomer at Varying Strain Amplitude

Abstract:

In recent years, polyurea has been successfully applied as a coating material for increasing the survivability of structures and components subjected to critical impact loading conditions. It was also shown that if a polyurea coating is reinforced with ceramic particles or short glass fibers, an enhanced benefit on the overall impact resistance due to the increased dissipation properties of the material can be observed. Notwithstanding the use of polyureas as coating materials for structures protection, other applications where control and damping of vibrations is of concern would benefit from the high dissipation characteristics of the reinforced elastomer. Nevertheless, there are well known drawbacks in the use of the reinforced elastomers which can be identified in their pronounced nonlinear behavior under cyclic loads and the softening of their mechanical properties. In order to investigate such a phenomenon, in this manuscript we present an experimental investigation conducted on the effects of different volume fractions of the same filler on the response of a polyurea elastomer at varying amplitudes of the applied strain. The characterization of the materials was conducted by using a dynamic mechanical analyzer (DMA). From our preliminary results we observed that in the case of polyurea reinforced with short glass fibers, the nonlinear response of the polymer at varying strain amplitudes becomes evident for fillers volume contents of 10%. Furthermore, the nonlinearity of the response of the material due to the Payne effect seems to be associated with the complex fibers-matrix interaction rather than the disruption of the agglomeration of the fillers under load.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 261-265
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.261
• Online since: June 2014
• Authors: Fabrizia Ghezzo*, Xi Geng Miao, Chun Lin Ji, Ruo Peng Liu
• Keywords: Composite, Dynamic Mechanical Analysis (DMA), Payne Effect, Polyurea, Strain

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