Life cycle assessment of carbon fiber-reinforced polymer composites
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The use of carbon fiber-reinforced polymer matrix composites is gaining momentum with the pressure to lightweight vehicles; however energy intensity and cost remain major barriers to the wide-scale adoption of this material for automotive applications. This study determines the relative life cycle benefits of two precursor types (conventional textile-type acrylic fibers and renewable-based lignin), part manufacturing technologies (conventional SMC and P4), and a fiber recycling technology.
Materials and methods
A representative automotive part, i.e., a 30.8-kg steel floor pan having a 17% weight reduction potential with stringent crash performance requirements, has been considered for the life cycle energy and emissions analysis. Four scenarios—combinations of the precursor types and manufacturing technologies—are compared to the stamped steel baseline part.
Results and discussion
The analysis finds the lignin-based part made through P4 technology to offer the greatest life cycle energy and CO2 emissions benefits. Carbon fiber production is estimated to be about 14 times more energy-intensive than conventional steel production; however, life cycle primary energy use is estimated to be quite similar to the conventional part, i.e., 18,500 MJ/part, especially when considering the uncertainty in LCI data that exist from using numerous sources in the literature.
The sensitivity analysis concludes that with a 20% reduction in energy use in the conversion of lignin to carbon fiber and no energy use incurred in lignin production since lignin is a by-product of ethanol and paper production, a 30% reduction in life cycle energy use could be obtained. A similar level of life cycle energy savings could also be obtained with a higher part weight reduction potential of 43%.
KeywordsAutomotive lightweighting Carbon fiber polymer composites Carbon fibers Life cycle analysis
- Allred RE (2005) Carbon-reinforced composite recycling: process and business development. Presented at Global Outlook for Carbon Fibers 2005, Intertech Conferences, San Diego, CAGoogle Scholar
- Arato C, Pye K, Gjennestad G (2004) The lignol approach to biorefining of woody biomass to produce ethanol and chemicals. Presented at the 26th Symposium on Biotechnology for Fuels and Chemicals, Chattanooga, TNGoogle Scholar
- Baker FS, Gallego NC, Naskar AK, Baker DA (2008) Low-cost carbon fibers from renewable sources: In FY2007 Progress Report: Automotive Lightweighting Materials, US Department of Energy, Washington, DCGoogle Scholar
- Brown HL, Hamel BB, Hedman BA, Koluch M, Gajanana BC, Troy P (1996) Energy analysis of 108 industrial processes. Fairmont, LiburnGoogle Scholar
- Font R, Esperanza M, Garica AN (2003) Toxic by-products from the combustion of Kraft Lignin. Chemosphere 52:1047–1058Google Scholar
- Ibis Associates, Inc. (Ibis) (2007). Results review: Technical cost model development for structural composite underbody. Presentation made to the ACC Composite Underbody Program, Waltham, Massachusetts, Nov. 25Google Scholar
- Jody BJ, Pomykala JA Jr, Daniels EJ, Greminger JL (2004) A process to recover carbon fibers from polymer-matrix composites in end-of-life vehicles. J Met 56(8):43–47Google Scholar
- Koltun A et al (2005) An approach to treatment of recycling in LCA. Paper presented at the 4th Australian LCA Conference. Sydney, Australia, FebGoogle Scholar
- Murphy T (2008) The new face of CAFÉ. Ward’s Autoworld February:36–40Google Scholar
- SimaPro (2008). SimaPro 7.1.7 LCA software. Pre Consultants, The Netherlands, http://www.pre.nl/simapro/default.htm
- Sullivan J, Hu J (1995) Life cycle energy analysis for automobiles. SAE paper No. 951829, Society of Automotive Engineers, Warrendale, PAGoogle Scholar
- Sullivan JL Williams RL, Yester S, Cobas-Flores E, Chubbs ST, Hentges SG and Pomper SD (1998) Life cycle inventory of a generic US family sedan: Overview of results USCAR AMP project. SAE Paper No. 982160, Society of Automotive Engineers, Warrendale, PAGoogle Scholar
- Suzuki T, Takahashi J (2005) Prediction of energy intensity of carbon fiber reinforced plastics for mass produced passenger cars, Proceedings of 9th Japan International SAMPE Symposium, pp 14–19Google Scholar
- Suzuki T, Odai T, Hukui R, Takahashi J (ND) LCA of passenger vehicles lightened by recyclable carbon fiber reinforced plastics. http://sunshine.naoe.t.u-tokyo.ac.jp. Accessed 9 September 2008
- US Department of Energy (DOE) (2008) Automotive composites consortium focal project 4. Automotive Lightweighting Materials: FY 2007 Progress Report, Washington, DCGoogle Scholar
- Wang MQ (2008) GREET 1.8b: The greenhouse gases, regulated emissions, and energy use in transportation (GREET) model. Center for Transportation Research, Argonne National Laboratory, Argonne, IL, Mar. 17Google Scholar