Degradation of E-glass fiber mechanical properties during composite sheet molding compound production for automotive app
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Research Letter
Degradation of E-glass fiber mechanical properties during composite sheet molding compound production for automotive applications† Ryan S. Ginder, Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA Darby Ker, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA Soydan Ozcan, Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA Address all correspondence to Ryan S. Ginder at [email protected] (Received 11 August 2019; accepted 18 October 2019)
Abstract Research into pyrolysis-based recycling of sheet molding compounds (SMCs) to recover glass fiber for reuse has indicated significant preexisting tensile strength damage in the shredded recycling input materials. This loss in mechanical durability inherently hurts the value proposition of recycled glass fiber by limiting reuse of the fiber for reinforcement. In this study, the mechanical properties of glass fibers at each step in the first lifecycle of an SMC material are measured to assess the extent of cumulating fiber damage prior to recycling and identify potential causes of this degradation to maximum fiber tensile performance.
The promise of high mechanical performance in a lightweight form factor continues to drive growing demand for composite materials in transportation and infrastructure. For example, recent data available from the American Composites Manufacturers Association (ACMA) indicates that approximately 2 million tons of composite materials are consumed by automotive sector applications annually.[1] While many different composite material types exist, the global market is monolithically dominated by glass fiber-reinforced polymers.[2] To illustrate this point, the glass fiber market for composites in 2017 was estimated to be about 5.2 million tons globally, while the carbon fiber market † This manuscript has been authored by UT-Battelle, LLC under Contract No. DEAC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The U.S. Department of Energy (DOE) will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy. gov/downloads/doe-public-access-plan). The information, data, or work presented here was funded in part by the Office of Energy Efficiency and Renewable Energy (EERE), the U.S. Department of Energy, under Award No. DE-EE0006926. The information, data, or work presented here was funded in part by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability o
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