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Performance Evaluations of Polyolefins vs. Engineering Thermoplastics for Blow Molded Bumper Beams for Mid-Size Vehicles – Part II
Technical Paper
1999-01-1015
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The consumption of blow molded bumpers for passenger vehicles is increasing, particularly for small to mid-size vehicles. The performance required for bumpers in this class of vehicles varies by geographic region, as “global” vehicles are increasingly specified outside of the United States. For this reason, it is important to understand the impact performance provided by materials that could be blow molded into bumpers for this class of vehicles. This paper will compare the relative performance of polycarbonate/polybutylene terephthalate (PC/PBT) alloys vs. polyolefins for impact protection, weight, and processing performance.
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Citation
Rawson, J., "Performance Evaluations of Polyolefins vs. Engineering Thermoplastics for Blow Molded Bumper Beams for Mid-Size Vehicles – Part II," SAE Technical Paper 1999-01-1015, 1999, https://doi.org/10.4271/1999-01-1015.Also In
References
- Morgan, T. Corsello, M. Day. A. Rawson B. Fedewa B. Development of a Blow Molded, Thermoplastic Front Bumper System Offering Angled Barrier Protection SAE International Congress and Exposition Detroit, Michigan February 24-27 1997 Paper No. 970486
- Rawson, J. Grosser, M. Performance Evaluations of Polyolefins vs. Engineering Thermoplastics for Blow Molded Bumper Beams for Mid-Size Vehicles SAE International Congress and Exposition Detroit, Michigan February 23-26 1998 Paper No. 980112
- LS-DYNA® Version 940 Livermore Software Technology Corporation, 2876 Waverly Way Livermore, CA 94550
- Automotive Bumper Systems – 1998 6-1 Phillip Townsend Associates, Inc. P.O. Box F, Mount Olive, NJ, 07828 Note: additional change in scrap loss to 1% for both materials. Scrap is defined unacceptable process output that is not re-used in the same process, but sold or discarded. Since blowmolding uses all of the regrind generated from the flash around the part, this can only be understood to mean the purging at start-up. Assuming we are not talking about a custom molder who will start up a new material every shift, this is probably 91 kg / week, or 4727 kg / year. The model assumes 1.439 MM kg / year in production, so the actual scrap can be estimated to be about 1 % / year.
- Evans, D. Consistency of Thermoplastic Bumper Beam Impact Performance SAE International Congress and Exposition Detroit, Michigan February 23-26, 998 Paper No. 980113