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A Novel “Blister-Inflation” Technique for Evaluating the Thermal Aging of Airbag Fabrics During Deployment
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Abstract
Due to commercial television almost everyone is familiar ‘automotive inflatable restraint system,’ commonly referred to as airbag. Traditionally these bags were made of polyamide fabrics coated with polychloroprene, which made them essentially impermeable. Even though this restraint technology has been in use for more than fifteen years, there remain some features that still need to be improved; i.e., the high cost, the high package volume, the weight and the need for replacement of coated fabrics. In this paper special attention is given to uncoated fabrics.
A novel blister-inflation technique was utilized to evaluate the permeability of test fabrics under biaxial stretching conditions. Further, the effect of inflation temperature and internal pressure drop across the fabric on the permeability of the fabrics can be evaluated by this technique.
The performances of two different fabrics were evaluated; namely the traditional polyamide offered in the construction of airbags, nylon 66, and a high strength poly(ethylene terephthalate). This paper looks beyond the phenomenological linear response of the fabrics' air permeability versus δp. The changes in the permeability of the fabric were explored for both increased pressure drops across the fabric and increased temperature. Temperature is especially significant around and above the glass-transition temperature of these polymers. The authors believe that this unique technique can be a useful tool for simulating the pressure-temperature-time history of the airbag during deployment.
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Citation
Keshavaraj, R., Tock, R., and Nusholtz, G., "A Novel “Blister-Inflation” Technique for Evaluating the Thermal Aging of Airbag Fabrics During Deployment," SAE Technical Paper 950341, 1995, https://doi.org/10.4271/950341.Also In
Issues in Automotive Safety Technology: Offset Frontal Crashes, Airbags, and Belt Restraint Effectiveness
Number: SP-1072; Published: 1995-02-01
Number: SP-1072; Published: 1995-02-01
References
- Ramesh, Keshavaraj Tock Richard W. Nusholtz Guy S. “Permeability Comparisons of Fabrics Used in Safety Airbag Constructions,” ANTEC' 94, SPE Technical Papers ( paper #122) May 1994
- Ramesh, Keshavaraj Tock Richard W. Dan, Haycook “Analysis of Fabrics used in Passive Restraint Systems,” Journal of the Textile Institute U.K.
- Ramesh, Keshavaraj Tock Richard W. Nusholtz Guy S. “Effects of Temperature and Pressure on Permeability of Expansible Airbag Fabrics,” Journal of Shock and Vibrations
- Tock R. Wm. Nusholtz Guy S. “Permeability- Temperature Relationships of Expansible Nylon Fabrics,” SPE, ANTEC' 93, Technical papers 1302 1306 1993
- Hoover K. C. Tock R. Wm. Polymer Engineering and Science 16 2 Feb. 1976
- Denson C. D. Polymer Engineering and Science 13 125 1973
- Denson C. D. Gallo R. J. Polymer engineering and science 11 174 1971
- Joye D. D. et. al. Trans. Soc. Rheol. 16 142 1972
- Ramesh, Keshavaraj Tock Richard W. Nusholtz Guy S. “Modeling of Biaxial Deformation of Airbag Fabrics using Artificial Neural Nets,” SAE International Congress and Exposition Conference Feb 1995
- Ramesh, Keshavaraj Tock Richard W. Dan, Haycook “Airbag-Fabric Material Modeling using Artificial Neural Nets,” Journal of Modeling and Simulation in Material science
- Ramesh, Keshavaraj Tock Richard W. Nusholtz Guy S. “Comparison of Contributions to Energy Dissipation Produced with Safety Airbags,” SAE International Congress and Exposition Conference Feb 1995