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LS-DYNA Crash Model Quality and Numerical Stability Engineering

30 Chapters
View Course Samples Online
01
Crash model quality framework
define model fidelity, numerical stability, and validation metrics within LS-DYNA explicit dynamics workflows.
frameworkfidelity
02
Mesh quality diagnostics for crash models
check aspect ratio, warpage, Jacobian, skew, and timestep impact using LS-PrePost and *CONTROL_TIMESTEP.
diagnosticsJacobian
03
Element formulation selection
compare ELFORM 1, 2, 6, 16, and -1 for shell and solid crash applications, including hourglass control and shear locking.
formulationselection
04
Material model calibration for crashworthiness
fit *MAT_PIECEWISE_LINEAR_PLASTICITY and *MAT_024 using tensile test data and strain-rate curves.
Materialcalibration
05
Contact definition quality
set up *CONTACT_AUTOMATIC_SINGLE_SURFACE and *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE with proper thickness, friction, and penetration checks.
definitionCONTACT
06
Initial penetration and interference resolution
detect and eliminate gaps and overlaps using *CONTROL_CONTACT and LS-PrePost penetration diagnostics.
penetrationinterference
07
Timestep control and mass scaling
apply *CONTROL_TIMESTEP with TSSFAC, DT2MS, and selective mass scaling to maintain stable explicit integration.
TimestepCONTROL
08
Hourglassing detection and mitigation
identify zero-energy modes and select IHQA, QH, and hourglass control parameters for shell and solid elements.
Hourglassingdetection
09
Energy balance verification
monitor GLSTAT and MATSUM for hourglass, internal, kinetic, and sliding interface energies to validate model quality.
verificationGLSTAT
10
Negative volume and element inversion
diagnose and repair negative volume errors using *CONTROL_TIMESTEP, element deletion, and mesh smoothing.
Negativeinversion
11
Strain-rate sensitivity and failure modeling
implement *MAT_ADD_EROSION and *MAT_123 with rate-dependent plasticity for crash simulations.
Strain-ratesensitivity
12
Spot weld and joint modeling
create *CONSTRAINED_SPOTWELD, *CONSTRAINED_NODAL_RIGID_BODY, and *MAT_SPOTWELD with failure criteria for automotive joints.
modelingCONSTRAINED
13
Airbag and occupant restraint modeling
set up *AIRBAG_WANG_NEFSKE and *AIRBAG_PARTICLE with proper fabric material and gas properties.
occupantrestraint
14
Seat belt and slip ring modeling
define *ELEMENT_SEATBELT, *MAT_SEATBELT, and *CONSTRAINED_SLIPRING for occupant kinematics.
modelingELEMENT
15
Barrier and impactor modeling
build rigid wall, pole, and deformable barrier models using *RIGIDWALL and *MAT_RIGID with correct mass and inertia.
impactormodeling
16
Rigid body and inertia modeling
apply *MAT_RIGID, *PART_INERTIA, and *CONSTRAINED_RIGID_BODIES for accurate crash pulse transfer.
modelingMAT
17
Damping and numerical stabilization
use *DAMPING_GLOBAL, *DAMPING_PART_STIFFNESS, and *CONTROL_DYNAMIC_RELAXATION for quasi-static and crash transients.
numericalstabilization
18
Subsystem and full vehicle model assembly
manage *INCLUDE, *PART, *SET_PART, and *SET_SEGMENT for modular crash model builds.
Subsystemassembly
19
Model checking and QA automation
run LS-DYNA implicit checks, *CONTROL_CHECK, and custom scripts to enforce model quality standards.
checkingautomation
20
Debugging unstable simulations
interpret negative volume, out-of-range velocities, and contact errors from d3hsp and messag files.
Debuggingunstable
21
Contact energy and friction validation
tune *CONTACT friction coefficients and check sliding interface energy against physical expectations.
frictionvalidation
22
Material failure and element deletion strategies
apply *MAT_ADD_EROSION, *MAT_015, and *MAT_081 with erosion criteria for crashworthiness.
Materialdeletion
23
Strain-rate effects in crash models
calibrate *MAT_024, *MAT_098, and *MAT_187 using split Hopkinson bar and high-speed tensile data.
Strain-ratecalibrate
24
Composite and lightweight material modeling
implement *MAT_054, *MAT_058, and *MAT_262 for CFRP and aluminum crash structures.
Compositelightweight
25
Occupant safety and dummy positioning
set up *MAT_ELASTIC, *MAT_FU_CHANG, and *CONSTRAINED_INTERPOLATION for Hybrid III and THOR dummies.
Occupantpositioning
26
Pedestrian protection and head impact
model *MAT_ELASTIC, *MAT_VISCOELASTIC, and *CONTACT_AUTOMATIC for headform and legform impactors.
Pedestrianprotection
27
Battery and electric vehicle crash modeling
apply *MAT_063, *MAT_183, and *CONTACT_THERMAL for lithium-ion cell and pack crush.
electricmodeling
28
Model validation and correlation
compare simulation results with sled and full-scale crash tests using objective rating metrics and signal processing.
validationcorrelation
29
Sensitivity and uncertainty quantification
run DOE with LS-OPT and LS-DYNA for mesh, material, and contact parameter sensitivity.
Sensitivityuncertainty
30
High-performance computing and model scalability
optimize *CONTROL_MPP_DECOMPOSITION, *CONTROL_PARALLEL, and memory settings for large crash models.
High-performancecomputing