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Airbag Fabric Testing and Material Model Calibration

30 Chapters
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01
Airbag fabric fundamentals
woven structure, yarn architecture, coating systems, and their role in occupant restraint performance.
structurearchitecture
02
Material characterization workflow
from fabric roll sampling and specimen preparation to test matrix design and data traceability.
Materialcharacterization
03
Quasi-static tensile testing of airbag fabrics
grip methods, gauge length selection, strain measurement, and interpretation of warp, weft, and bias response.
Quasi-staticselection
04
High-speed tensile testing
servo-hydraulic and drop-weight systems, strain-rate regimes, inertial effects, and data reduction for airbag deployment conditions.
High-speedservo-hydraulic
05
Tear and crack propagation testing
trapezoidal tear, tongue tear, and edge notch methods for assessing fabric damage tolerance.
propagationtrapezoidal
06
Biaxial and multiaxial testing of airbag fabrics
cruciform specimens, pressure blister methods, and characterization of anisotropic membrane behavior.
multiaxialcruciform
07
Shear and in-plane shear characterization
picture-frame, bias extension, and trellis effects in woven airbag fabrics.
in-planecharacterization
08
Fabric permeability and porosity measurement
air permeability, leakage pathways, and their influence on inflator sizing and bag pressurization.
permeabilityporosity
09
Coating and surface characterization
silicone and neoprene coatings, adhesion testing, coating weight, and thermal aging effects.
characterizationsilicone
10
Friction and interfacial testing
yarn-to-yarn friction, fabric-to-fabric friction, and coating-to-fabric interaction relevant to deployment and folding.
Frictioninterfacial
11
Viscoelastic and rate-dependent behavior
relaxation, creep, dynamic mechanical analysis, and time-temperature superposition for airbag fabrics.
Viscoelasticrate-dependent
12
Temperature and humidity conditioning
environmental chambers, moisture uptake, and their effects on tensile, tear, and permeability properties.
Temperaturehumidity
13
Aging and durability testing
heat aging, humidity cycling, UV exposure, and correlation with vehicle lifetime requirements.
durabilityhumidity
14
Constitutive modeling overview for airbag fabrics
continuum, meso-mechanical, and phenomenological approaches for woven membranes.
Constitutivemodeling
15
Linear elastic and orthotropic models
engineering constants, plane stress assumptions, and limitations for large deformation airbag simulations.
orthotropicconstants
16
Hyperelastic models for coated fabrics
Mooney-Rivlin, Ogden, and Yeoh formulations with application to airbag membrane behavior.
HyperelasticMooney-Rivlin
17
Anisotropic hyperelastic models
fiber-reinforced formulations, invariant-based models, and calibration strategies for warp and weft directions.
Anisotropichyperelastic
18
Visco-hyperelastic and viscoelastic models
Prony series, nonlinear viscoelasticity, and rate-dependent calibration for deployment simulations.
Visco-hyperelasticviscoelastic
19
Damage and failure models
continuum damage mechanics, strain-based failure criteria, and element deletion strategies for fabric rupture.
continuummechanics
20
Calibration workflow
parameter identification from tensile, biaxial, and shear tests using least-squares, genetic algorithms, and Bayesian methods.
Calibrationworkflow
21
Model validation and verification
mesh convergence, element type selection, single-element tests, and comparison with physical airbag tests.
validationverification
22
Finite element modeling of airbag deployment
fabric material cards, fluid-structure interaction, and folding patterns in LS-DYNA and similar solvers.
modelingdeployment
23
Uncertainty quantification in material models
test scatter, parameter sensitivity, and robust calibration for safety-critical applications.
Uncertaintyquantification
24
Case study
calibration of a coated nylon 6.6 airbag fabric for frontal driver-side deployment simulation.
calibrationdriver-side
25
Case study
side curtain airbag fabric modeling with high-speed tensile and biaxial test data.
modelinghigh-speed
26
Case study
pedestrian protection airbag fabric under varying temperature and strain-rate conditions.
pedestrianprotection
27
Experimental design for calibration
optimal test selection, specimen count, and data filtering to avoid overfitting.
Experimentalcalibration
28
Software tools and data management
MCalibration, LS-OPT, Python scripting, and database structures for material model traceability.
Softwaremanagement
29
Industry standards and regulations
ASTM, ISO, SAE, and FMVSS test methods relevant to airbag fabric qualification and model acceptance.
Industrystandards
30
Capstone project
end-to-end testing and calibration of an airbag fabric, from specimen preparation to validated simulation model.
Capstoneend-to-end