The mechanical behavior of amorphous thermoplastics, such as poly(methyl methacrylate) (PMMA), strongly depends on temperature and strain rate. Understanding these dependencies is critical for many polymer processing applications and, in particular, for those occurring near the glass transition temperature, such as hot embossing. In this study, the large strain mechanical behavior of PMMA is investigated using uniaxial compression tests at varying temperatures and strain rates. In this study we capture the temperature and rate of deformation dependence of PMMA, and results correlate well to previous experimental work found in the literature for similar temperatures and strain rates. A three-dimensional constitutive model previously used to describe the mechanical behavior of another amorphous polymer, poly(ethylene terephthalate)-glycol (PETG), is applied to model the observed behavior of PMMA. A comparison with the experimental results reveals that the model is able to successfully capture the observed stress-strain behavior of PMMA, including the initial elastic modulus, flow stress, initial strain hardening, and final dramatic strain hardening behavior in uniaxial compression near the glass transition temperature.
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e-mail: dupaix.1@osu.edu
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October 2006
Research Papers
Large Strain Mechanical Behavior of Poly(methyl methacrylate) (PMMA) Near the Glass Transition Temperature
G. Palm,
G. Palm
Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
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R. B. Dupaix,
R. B. Dupaix
Department of Mechanical Engineering,
e-mail: dupaix.1@osu.edu
The Ohio State University
, Columbus, OH 43210
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J. Castro
J. Castro
Department of Industrial, Welding, and Systems Engineering,
The Ohio State University
, Columbus, OH 43210
Search for other works by this author on:
G. Palm
Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
R. B. Dupaix
Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210e-mail: dupaix.1@osu.edu
J. Castro
Department of Industrial, Welding, and Systems Engineering,
The Ohio State University
, Columbus, OH 43210J. Eng. Mater. Technol. Oct 2006, 128(4): 559-563 (5 pages)
Published Online: January 16, 2006
Article history
Received:
July 30, 2005
Revised:
January 16, 2006
Citation
Palm, G., Dupaix, R. B., and Castro, J. (January 16, 2006). "Large Strain Mechanical Behavior of Poly(methyl methacrylate) (PMMA) Near the Glass Transition Temperature." ASME. J. Eng. Mater. Technol. October 2006; 128(4): 559–563. https://doi.org/10.1115/1.2345447
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