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.
Analysis of fabrics used in passive restraint systems - airbags
Analyse von Geweben für passive Rückhaltesysteme - Airbags
Journal of the Textile Institute ; 87 , 3 Part 1 ; 554-571
1996
18 Seiten, 11 Bilder, 5 Tabellen, 20 Quellen
Aufsatz (Zeitschrift)
Englisch
Seitenairbag und Kinderrückhaltesysteme.
Side airbags and child restraint systems
ELBA - Bundesanstalt für Straßenwesen (BASt) | 2011
|Evolution of coated fabrics for automotive airbags
Tema Archiv | 1994
|Guidelines for Evaluating Child Restraint System Interactions with Deploying Airbags
SAE Technical Papers | 2011
Guidelines for Evaluating Child Restraint System Interactions with Deploying Airbags
SAE Technical Papers | 2001