Abstract
Characterizing Poly(methyl methacrylate) (PMMA) across its glass transition temperature is essential for modeling warm deformation processes such as hot embossing. Its mechanical properties vary significantly across the glass transition as well as with strain rate. Several previous models have attempted to capture this behavior utilizing uniaxial compression experimental data with limited success. In this work, compression experiments including stress relaxation at large strains are conducted to aid researchers in developing better models. Multiple temperatures, final strains, and strain rates are examined to characterize the material across values found in typical hot-embossing processes. It was found that the amount of stress relaxed is highly dependent on the temperature and strain at which it is held. With this data, a model can be developed that will accurately capture stress relaxation with the final goal of being able to simulate hot embossing processes.
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© 2014 The Society for Experimental Mechanics, Inc.
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Mathiesen, D., Vogtmann, D., Dupaix, R. (2014). Stress-Relaxation Behavior of Poly(Methyl Methacrylate) (PMMA) Across the Glass Transition Temperature. In: Antoun, B., et al. Challenges In Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00852-3_2
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DOI: https://doi.org/10.1007/978-3-319-00852-3_2
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