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LS-DYNA Airbag Folding and Deployment Modeling

30 Chapters
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01
Airbag system fundamentals
occupant restraint principles, bag types, inflator characteristics, and deployment kinematics relevant to LS-DYNA modeling.
occupantrestraint
02
LS-DYNA explicit solver essentials for airbag simulation
time integration, time-step control, mass scaling, and stability considerations.
LS-DYNAexplicit
03
Airbag fabric material modeling
isotropic and anisotropic hyperelastic models, fabric permeability, and strain-rate effects in LS-DYNA.
materialmodeling
04
Inflator modeling strategies
tank test data reduction, mass flow rate and temperature curves, and *AIRBAG_* keyword options.
Inflatormodeling
05
Uniform pressure (UP) method
*AIRBAG_WANG_NEFSKE* and *AIRBAG_SIMPLE_PRESSURE_VOLUME* setup, gas properties, and limitations.
pressureAIRBAG
06
Control volume (CV) method
*AIRBAG_CONTROL_VOLUME* theory, leakage, porosity, and multi-chamber configurations.
AIRBAGCONTROL
07
Particle-based gas dynamics
*AIRBAG_PARTICLE* method for early deployment and jet effects.
Particle-baseddynamics
08
ALE and FSI approaches for airbag inflation
*CONSTRAINED_LAGRANGE_IN_SOLID* and gas-structure interaction best practices.
ALEFSI
09
Airbag folding fundamentals
fold patterns (roll, accordion, Z-fold, pleat), fold line definition, and geometric preparation.
patternsaccordion
10
CAD preparation and meshing for folded airbags
shell element selection, mesh density, and quality metrics.
CADpreparation
11
Manual folding techniques in LS-DYNA
*INITIAL_FOLD* keyword, fold angle definition, and sequence control.
techniquesLS-DYNA
12
Automated folding with LS-PrePost
fold pattern generation, mapping, and verification workflows.
AutomatedLS-PrePost
13
Folding simulation using *AIRBAG_REFERENCE_GEOMETRY*
stress initialization and relaxation strategies.
simulationAIRBAG
14
Airbag module assembly modeling
housing, cover, tether, and seam representations.
assemblymodeling
15
Contact definitions for airbag deployment
*CONTACT_AUTOMATIC_SINGLE_SURFACE*, *CONTACT_AIRBAG_SINGLE_SURFACE*, and self-contact management.
definitionsdeployment
16
Tether and seam modeling
*ELEMENT_BEAM*, *CONSTRAINED_NODAL_RIGID_BODY*, and failure criteria for seams.
modelingELEMENT
17
Venting and leakage modeling
vent hole definitions, porosity, and *AIRBAG_* leakage parameters.
modelingdefinitions
18
Occupant positioning and interaction
*CONSTRAINED_INTERPOLATION*, dummy positioning, and out-of-position (OOP) scenarios.
Occupantpositioning
19
Deployment simulation workflow
initialization, inflation, contact, and termination control.
Deploymentsimulation
20
Validation and correlation
tank tests, static deployment tests, and sled test comparisons using LS-DYNA results.
Validationcorrelation
21
Mesh sensitivity and convergence studies for airbag deployment
element size, time step, and solution accuracy.
sensitivityconvergence
22
Numerical stability and troubleshooting
negative volume, energy balance, contact instability, and debugging strategies.
Numericalstability
23
Performance optimization
mass scaling, selective subcycling, parallel processing (SMP/MPP), and GPU acceleration.
Performanceoptimization
24
Side airbag and curtain airbag modeling
specific folding patterns, inflator placement, and interaction with interior trim.
modelingspecific
25
Passenger airbag modeling
top-mount vs. mid-mount, chute design, and windshield interaction.
Passengermodeling
26
Driver airbag modeling
steering wheel integration, cover tear seam, and clock spring effects.
modelingsteering
27
Pedestrian airbag and external airbag modeling
deployment outside the vehicle, sensor triggering, and pedestrian protection.
Pedestrianexternal
28
Advanced material models for airbag fabrics
*MAT_FABRIC*, *MAT_ORTHOTROPIC_ELASTIC*, and user-defined materials.
Advancedmaterial
29
Coupling airbag deployment with occupant simulation
*CONSTRAINED_INTERPOLATION* and *AIRBAG_* interaction with *MAT_RIGID* dummies.
Couplingdeployment
30
Case study
full vehicle frontal impact airbag deployment simulation, from folding to occupant injury criteria evaluation.
deploymentsimulation