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LS-DYNA Energy Balance and Hourglass Control

30 Chapters
View Course Samples Online
01
Energy balance fundamentals in explicit dynamics
kinetic, internal, hourglass, and contact energies, and the global energy equation.
explicitdynamics
02
Hourglass modes in reduced-integration solid and shell elements
deformation patterns, zero-energy modes, and their physical interpretation.
Hourglassreduced-integration
03
LS-DYNA energy database
GLSTAT, MATSUM, SLEOUT, and RCFORC outputs; extracting and interpreting energy time histories.
LS-DYNAdatabase
04
Hourglass control formulations in LS-DYNA
viscous, stiffness, and combined forms; IHQ and QH parameters for solids and shells.
Hourglassformulations
05
Diagnosing hourglassing
visual indicators, hourglass energy ratio thresholds, and mesh sensitivity checks.
Diagnosinghourglassing
06
Energy balance verification workflow
setting up a baseline model, tracking energy components, and identifying imbalances.
verificationworkflow
07
Hourglass control parameter tuning for solid elements
IHQ=1 to 6, QH, and coefficient sensitivity studies.
Hourglassparameter
08
Hourglass control for shell elements
ELFORM, NIP, and hourglass stabilization options; membrane and bending behavior.
Hourglasselements
09
Contact energy and its role in global energy balance
penalty stiffness, friction, and energy dissipation.
stiffnessfriction
10
Energy error sources
negative internal energy, initial penetration, and improper material models.
negativeinternal
11
Case study
low-velocity impact on a thin plate—hourglass energy monitoring and control selection.
low-velocityhourglass
12
Case study
axial crushing of a square tube—energy absorption and hourglass energy fraction.
crushingabsorption
13
Case study
bird strike on a composite panel—hourglass control for shell and solid elements.
compositehourglass
14
Case study
drop test of an electronic assembly—energy balance with contact and hourglass effects.
electronicassembly
15
Mesh refinement and hourglassing
element aspect ratio, distortion, and integration point placement.
refinementhourglassing
16
Advanced hourglass control
selective reduced integration, assumed strain, and physical stabilization.
Advancedhourglass
17
Energy-based adaptive remeshing
triggers, criteria, and maintaining energy conservation.
Energy-basedadaptive
18
Implicit vs. explicit energy balance
static and quasi-static analyses with hourglass control.
Implicitexplicit
19
Hourglass control in SPH and EFG methods
similarities and differences from Lagrangian formulations.
HourglassSPH
20
Energy partitioning in blast and impact simulations
internal energy, hourglass, and erosion effects.
partitioningsimulations
21
Practical workshop
building a model with controlled hourglassing and validating energy balance.
workshopbuilding
22
Practical workshop
parameter study on hourglass coefficient for a crash box.
workshopparameter
23
Practical workshop
debugging an energy imbalance in a complex assembly model.
workshopdebugging
24
Best practices for hourglass control in automotive crashworthiness simulations.
Best practices for hourglass control in automotive crashworthiness simulations.
practiceshourglass
25
Best practices for energy balance in aerospace impact and penetration analyses.
Best practices for energy balance in aerospace impact and penetration analyses.
practicesaerospace
26
Verification and validation
comparing energy components with experimental data.
Verificationvalidation
27
Automating energy balance checks with LS-DYNA scripting and post-processing tools.
Automating energy balance checks with LS-DYNA scripting and post-processing tools.
AutomatingLS-DYNA
28
Common pitfalls and troubleshooting
hourglass energy spikes, negative energies, and contact energy anomalies.
pitfallstroubleshooting
29
Recent developments in hourglass control and energy conservation in LS-DYNA.
Recent developments in hourglass control and energy conservation in LS-DYNA.
developmentshourglass
30
Capstone project
full simulation of an engineering impact problem with rigorous energy balance and hourglass control documentation.
Capstonesimulation