The paper concerns the permeability and biaxial stress-strain behavior of woven fabrics used in the construction of automotive airbags. During deployment, gases are generated which inflate the airbag, distend it, and then energy is dissipated by the viscous flow of air forced to pass through the fabric. In order to quantify this latter behavior, the permeability of samples of expansible fabric was correlated with biaxial stress-strain behavior using a 'blister-inflation' technique. This paper presents the laboratory data obtained from two different commercial fabrics, nylon 66 and polyester, offered for use in the manufacture of automobile airbags. Overall, permeability measurements were made on the fabric samples for 15 different isobaric pressure drops (3.44 kPa to 103.42 kPa) and five different temperatures ranging form 8 deg C to 95 deg C. Both temperature and pressure were found to affect the permeability of the fabrics. For both types of fabrics tested, the maximum permeability was observed to coincide with temperatures below room temperature, while a minimum occurred at temperatures above the glass transition temperatures, Tg, of the polymeric fibers. The biaxial stress-strain behavior was determined both by a blister-inflation technique and with a much more rapid ASTM ball-burst experiment. A strong correlation between the measured permeability characteristics and the biaxial stress-strain properties was observed. The paper also characterizes the importance of the biaxial stress-strain phenomena encountered during inflation. Finally, the variation in permeability with temperature and within fabrics samples was estimated by analysis of variance procedures. On this basis most of the variation can be attributed to the temperature level of the experiment.


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    Title :

    Analysis of fabrics used in passive restraint systems - airbags


    Additional title:

    Analyse von Geweben für passive Rückhaltesysteme - Airbags


    Contributors:
    Keshavaraj, R. (author) / Tock, R.W. (author) / Haycook, D. (author)

    Published in:

    Journal of the Textile Institute ; 87 , 3 Part 1 ; 554-571


    Publication date :

    1996


    Size :

    18 Seiten, 11 Bilder, 5 Tabellen, 20 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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