| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
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General Abstracts: Structural Materials Division
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| Presentation Title |
Constitutive Response of Polymers, Filled and Unfilled, as a Function of Temperature and Strain-Rate |
| Author(s) |
Eric N Brown, Carl M. Cady, George T. Gray III, Mathew W. Lewis, Dana M. Dattelbaum |
| On-Site Speaker (Planned) |
Eric N Brown |
| Abstract Scope |
Recently, interest has been shown concerning the mechanical response of polymers and polymer composites for several reasons. First, evidence has shown that there may be issues with aging and nitroplasticizer uptake. The second area of focus was related to the development of predictive materials models that describe the mechanical behavior of these materials. Accordingly, detailed information about the constitutive response is crucial. Compression measurements were conducted on these materials as a function of temperature from -55˚C to +70˚C and strain rate using a specially-designed split Hopkinson pressure bar (strain rate of ≈ 2800 s<sup>-1</sup>) and quasi-statically (strain rates from ≈ 0.001 to 1 s<sup>-1</sup>) using a hydraulic load frame. The mechanical response of the filled VCE showed a strong dependency on strain rate and was most sensitive to changes in test conditions. The filled foam materials were much less sensitive to changes in temperature or strain rate. The visco-elastic recovery of VCE is seen to dominate the mechanical behavior at temperatures above the glass transition temperature (T<sub>g</sub>). It also exhibited increasing elastic loading moduli, E, with increasing strain rate or decreasing temperature, which is similar to other polymeric materials and there is a pronounced shift in the apparent T<sub>g</sub> to higher temperatures as the strain rate is increased. Analysis of the filled materials implies damage in the filler material as indicated by a load drop on the stress-strain curve. |
| Proceedings Inclusion? |
Definite: A CD-only volume |