Abstract
Carbon fiber (CF)-reinforced thermoplastic composites have been widely used in different structural applications due to their superior thermal and mechanical properties. The big area additive manufacturing (BAAM) system, developed at Oak Ridge National Laboratory’s Manufacturing Demonstration Facility, has been used to manufacture several composite components, demonstration vehicles, molds, and dies. These components have been designed and fabricated using various CF-reinforced thermoplastics. In this study, the dynamic rheological and mechanical properties of a material commonly used in additive manufacturing, 20 wt% CF-acrylonitrile butadiene styrene (ABS), as well as three CF-reinforced high-temperature polymers, 25 wt% CF-polyphenylsulfone (PPSU), 35 wt% CF-polyethersulfone (PES), and 40 wt% CF-polyphenylene sulfide (PPS), used to print molds were investigated. The viscoelastic properties, namely storage modulus, loss modulus, tan delta, and complex viscosity, of these composites were studied, and the rheological behavior was related to the BAAM extrusion and bead formation process. The results showed 20 wt% CF-ABS and 40 wt% CF-PPS to display a more dominant elastic component at all frequencies tested while 25 wt% CF-PPSU and 35 wt% CF-PES have a more dominant viscous component. This viscoelastic behavior is then used to inform the deposition and bead formation process during extrusion on the BAAM system.
Original language | English |
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Pages (from-to) | 1443-1461 |
Number of pages | 19 |
Journal | Journal of Thermoplastic Composite Materials |
Volume | 34 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2021 |
Funding
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. The authors thank Techmer ES and BASF for providing all the materials used in this research. The authors also acknowledge the partial support of the Center for Materials Processing, a Tennessee Higher Education Commission (THEC) supported Accomplished Center of Excellence, for the use of various processing equipment to conduct parts of this research. The authors thank Techmer ES and BASF for providing all the materials used in this research. The authors also acknowledge the partial support of the Center for Materials Processing, a Tennessee Higher Education Commission (THEC) supported Accomplished Center of Excellence, for the use of various processing equipment to conduct parts of this research. The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.
Keywords
- Big area additive manufacturing
- high-temperature thermoplastics
- printability
- reinforced thermoplastics
- rheological characteristics