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Support

Neck Load Cells
Numbering
Numbering Scheme
Numbering
Neck Pendulum Test
Neck Torsion
Outer Rib Band Test
Numbering
Not a Number (NaN)
Negative volume in soft materials
Orthotropic materials
Negative volumes in brick elements
No matter how I’ve tried, I can’t trim the elements with the IGES line data. Is there any alternative to do trimming?
Optimization
Official Release of LS-TaSC (Topology and Shape Computation) available
Optimization
Multiobjective Optimization
Multi-level Optimization
Multi-objective optimization (MOO)
Mass Measurements
Marker Evaluation
Marker Evaluation
Mass scaling
Mass scaling
Mass report in D3HSP file
Manuals
Manuals
Material Tests
Material Tests
Modeling guidelines for full vehicle contact
Modeling guidelines for full vehicle contact
Material
Material model for TRIP-steels
Material models for polymers
Modell Check / Initialisation Run
Metal forming
Miscellaneous
Metal Forming Optimization
Metal Forming
Lumbar Load Cell
Lumbar Spine Tests
LST Free Motion Headform
LS-Post binary database
LS-Prepost
LS-TaSC 2022 R1
LS-TaSC 2021 R1
LS-TaSC 4.2
LS-TaSC 4.1
LS-TaSC 4.0
LS-TaSC 3.2
LS-TaSC 3.1
LS-TaSC 3.0
LS-TaSC 2.1
LS-TaSC 2.0
LS-PrePost
LS-PrePost
Managing disk space during run time
LS-TaSC
LS-OPT User’s Group on Google
LS-OPT Support Site
LS-OPT
LS-DYNA V971 R6.1.2 (R6.85274) released
LS-DYNA V971 R6.1.1 (R6.78769) released
LS-DYNA V971 R6.1.0 (R6.74904) released
LS-OPT 7.0
LS-OPT 6.0
LS-OPT 5.2
LS-OPT 5.1
LS-OPT 5.0
LS-OPT 4.3
LS-OPT 4.2
LS-OPT 4.1
LS-OPT 4.0
LS-OPT 3.4
LS-OPT 3.3
LS-OPT 3.2
LS-OPT Training Class Tutorial Problems
LS-OPT
LS-OPT cannot find the output file from the FE preprocessor
LS-DYNA support
LS-DYNA User’s Guide
LS-DYNA runs into Segmentation Violation (SIGSEGV) error. What can I do?
LS-DYNA R9.3.1 (R9.140922; 2019/10) released
LS-DYNA R9.3.0 (R9.128342; 2018/07) released
LS-DYNA R9.3.0 (R9.128342; 2018/07) released
LS-DYNA R9.2.0 (R9.119543; 2017/08) released
LS-DYNA R9.1.0 (R9.113698; 2018/02) released
LS-DYNA V971 R4.2.1 (R4.53450) released
LS-DYNA V970 Revision 3858
LS-DYNA V970 Revision 3858 (MPP only)
LS-DYNA V970 Revision 6763
LS-DYNA V971 R4.2 (R4.50638) released
LS-DYNA V971 R3.2.1 (R3.47756) released
LS-DYNA V971 R3.2 (R3.46862) released
LS-DYNA V971 R3.1 (R3.43919) released
LS-DYNA V971 R6.0.0 (R6.71488) released
LS-DYNA V971 R5.1.1 (R5.65550) released
LS-DYNA V971 R5.1 (R5.64536) released
LS-DYNA V971 R5.0 (R5.59419) released
LS-DYNA R15.0.2 released (2024/03)
LS-DYNA R15.0.1 released (2024/03)
LS-DYNA R15.0.0 released (2024/02)
LS-DYNA R14.1.0 released (2023/12)
LS-DYNA R12.2.1 released (2023/05)
LS-DYNA R14.0.0 released (2023/05)
LS-DYNA R13.1.0 released (2022/03)
LS-DYNA R11.2.2 released (2021/06)
LS-DYNA R11.2.1 released (2021/03)
LS-DYNA R11.2.0 released (2020/12)
LS-DYNA R12.0.0 (R12.148978; 2020/07) released
LS-DYNA R11.1.0 (R11.139588; 2019/08) released
LS-DYNA R9.0.1 (R9.109912; 2016/08) released
LS-DYNA R7.1.3 (R7.107967) released
LS-DYNA R8.1.0 (R8.105896) released
LS-DYNA R8.0.0 (R8.95309) released
LS-DYNA R7.1.2 (R7.95028) released
LS-DYNA R7.1.1 (R7.88575) released
LS-DYNA R7.1.0 (R7.88052) released
LS-DYNA R7.0.0 (R7.79069) released
Local Coordinate Systems
License File and Usage
Load Cells
Knee Load Cells
License File and Usage
Limitations and Further Work
Locking in a quadrilateral element
LS-DYNA Manuals
LS-DYNA R10.2.0 (R10.135267; 2019/03) released
LS-DYNA R11.0.0 (R11.129956; 2018/09) released
LS-DYNA R10.1.0 (R10.123355; 2018/02) released
LS-DYNA R10.0.0 (R10.118302; 2017/07) released
LS-DYNA 971-7600.398 released
LS-DYNA 971-7600.129 released
LS-DYNA 970.5434a released
LS-DYNA 971-7600.1224 released
LS-DYNA 971-7600.1116 released
LS-DYNA 971-7600.1077 released
Links
Load Cases
Keywords Used
Keywords used
Keywords Used
Knee and Ankle Rotation
IR-TRACCs length and relative rotation
Keywords Used
Introduction LS-DYNA/LS-PrePost for explicit and implicit analysis
Internal Energy
Joint stiffness
Is it possible to allow separation/gap between elements within one part?
Is it possible to allow separation/gap between elements within one part?
Is it possible to coarsen a uniformly refined mesh, as well as an adaptively generated mesh?
Is it possible to do forming simulation by using both implicit and explicit method in the same run?
Is the order relevant in which I do triming and coarsening of the mesh?
Is there a way to prevent distortion?
Is there a way to reduce the penetration problem?
Is there any limitation for LSDYNA3D to be applied to Metal-Forming analysis?
Integrating a Pre-Processor: METApost
Integrating Excel
Is it possible to skip the reading of large include files?
Injury Criteria
Injury Criteria
Inner Rib Band with damping material
Injury Criteria
Initial Penetrations
Install a New Network License (Microsoft Windows)
Install a New Network License (Linux/Unix/Solaris)
In implicit analysis of springback process, there are both linear and non-linear methods. Can you advise which one is better?
In implicit forming analysis, I found that the friction force was not properly applied, what could have been the problem?
In LS-DYNA, there are different material models and I’ve found it difficult to choose the proper material model. Would you please give me some suggestions in selecting the proper material model?
In my analysis of the sheet metal forming process, I frequently found that the calculation could not continue and it terminated unexpectedly. Is there a way to avoid this?
In my simulation, some of the corner nodes can be put in the wrong place. Can you advise what the problem is?
In springback analysis I don’t have enough memory or the analysis takes too much time. What can I do ?
In springback analysis, I found that my constraint hasn’t been taken into account during the simulation, what was the problem?
In springback analysis, I just changed the constrained nodes a little bit away from the original node. The convergence then became very different and the predicted result seems not to be reasonable. What can be the problem?
In springback analysis, we had no problem when gravity effect is not considered. However, after gravity effect is included in the input deck, there were some strange error messages. What might be the cause?
Important information about LS-PrePost
Import User Results
Integrating a Pre-Processor
Import Design Functions
Iliac Wing Tests
Implicit
Implicit: Contact treatment
Implicit: Convergence
Implicit: Dynamic relaxation
Implicit: Loads on rigidbodies
Implicit: Memory notes
Implicit: Recommendation on solid element formulation
Implicit: Mortar Contact
Implicit: Checklist
I have very long run times. What can I do?
I just have one IGES file for the part, and I don’t want to offset the surface for the punch and die physically. Is it possible to offset the two surfaces internally inside LSDYNA3D? If yes, how do you offset these two surfaces?
I think spring back prediction by using implicit is not realistic. What is your opinion regarding the convergence issue?
I tried to use LSPOST to compare the strain state with FLD. When I selected the element and clicked the plot button, nothing was plotted. What was the problem?
If a converged solution from springback prediction cannot be obtained after trying many different combinations of parameters, what else can I do?
If I didn’t find wrinkling and strain localization in from my simulation, can I say that my design is good?
If I use very coarse mesh for the pre-deformation (such as pre-bending, gravity loading etc), and then refine the mesh in the later forming analysis. Will it result in obvious numerical error for the final results?
If localized necking occurs what can I do to get rid of it?
If wrinkling occurs, what can I do to get rid of it?
I’ve found that when I use several CPUs with the SMP code that only one CPU is working and the other CPUs are idle. What is the problem and how can it be corrected?
HowTos
How to read NASTRAN bulk data files.
How do you trim the blank after a forming analysis?
How do you trim the blank after a forming analysis?
How do you use RIGID_BODY_STOPPER?
How is the FLD obtained in LSPOST? What is the limitation of using this FLD?
How many levels of adaptive mesh do I need in my calculation?
How to do hydro forming analysis?
How to use non-smooth trimming?
I found that the number of adapted elements was too large when I performed a multi-stage forming analysis using adaptivity. Is there a way to avoid this problem?
I generated a dynain file after forming analysis. Additionally, I used DYNAFORM to trim the mesh, and did springback prediction. However, I found that the predicted springback is too small to be true. What is the problem?
I had no problem in running a forming job, however, when I used adaptive method, the contact does work properly even from the beginning without adaptivity. What is the problem?
I have no experience in springback prediction, and have no idea whether my prediction is reasonable. Do you have any idea how accurate the solution could be from LSDYNA?
HowTos
Hypergraph
HyperMorph
How does the point selection algorithm work for probabilistic variables?
How does the domain reduction in SRSM work for discrete variables?
How to specify Abnormal Termination when using runqueuer/wrapper?
How is it topology optimization different from sizing and shape optimization?
Head Restraint Force
Head position adjustment
History Variables for Certain Material Models
Hourglass
How can nodal accelerations be evaluated in LS-DYNA?
How can I handle contact between beams and shells?
How can I evaluate material formability for a new material?
How can I specify friction coefficient in the contact interface?
How can you add constraints for a springback analysis?
How are predicted histories calculated?
How can I ensure that LS-OPT replaces the variables in the input file by integer values?
How can the number of solver jobs to be run in parallel be defined?
How can I determine the time value where a history curve takes a specific value?
How contact works
How can you evaluate the material formability under complexity deformation condition or multiple steps forming?
How do I choose the element type for the analysis of sheet metal stamping?
How do I implement my own FLD in LSPOST?
How do I specify the draw bead force?
How do I use define draw bead in stamping analysis?
How do you perform a multiple step analysis?
General Information
General Information
General Information
General Information
Generalizing the yield function
General remarks on implicit time integration
General
General
General
Generic Extractor (GenEx)
GenEx
Head Acceleration
Head Drop Test
Head Neck Tests
Head Acceleration
Getting Started
Getting started with LS-DYNA
Getting Started
Gravity Load
Getting Started with LS-TaSC 3.0
Femoral Load Cells
Flat Barrier
File organization
Extra history variables
FAQ
Examples: Optimization
Examples: Robustness
Examples: Parameter Identification
FAQs
Future Work
Flat Barrier : Arm Position — Second Notch
Flat Barrier : Arm Position — First Notch
Flat Barrier and WorldSID without Arm
General
Force Analysis
Forces of nodes
From engineering to true strain, true stress
Force transducer
Full Vehicle MDO
General
Dummy Model Support
ES-2 and ES-2re
Edge-to-edge contact
Dynamic relaxation
Elements
Energy data
Element Locking
Effective plastic strain
Environment variables
Equation of state
Eulerian method; basics
Element
EDGE-to-EDGE Contact
Elements and material models available for implicit
During the forming analysis I found that some elements in the blank became distorted. How can this problem be solved?
Even if I include the card of *CONTROL_ADAPTIVE in my input deck, the blank is not adapted. How can I fix this problem?
Downloads
Examples
Download more examples
Evaluate Metamodels
Differences ES-2 and ES-2re Models
Deflections & Rotations
Cross section
Damping
Define composites
Discrete Beam
Crashworthiness Optimization
Design variables
Direct Optimization
Curve Mapping
Creating imperfections in LS-DYNA® using the *PERTURBATION keyword
Curve Matching Metrics
Documents and Manuals
Documents and Manual
Double precision
Do you have tips how to combat instabilities?
Do I have an easier way to define the velocity curve?
Do I have to consider the thickness of the blank?
Do I have to consider the thickness of the rigid bodies?
Documents
Contact Definitions
Contact Definitions
Contact Definitions
Contact Modeling in LS-DYNA
Contact types
Contact stiffness calculation
Contact output
Contact parameters
Contact modeling in LS-DYNA
Constraints and spotwelds
Contact Energy
Coordinate system for stress
Contact
Contact between Beam and Shell Elements
Contact overview
Contact stiffness influenced by time step size
Contact thickness
Contact timestep
Contact
Coupling ANSA
Common Workflow: positioning under gravity load
Component Tests
Configuration A
Configuration B
Configuration C
Configuration D
Configuration E
Configuration F
Constraint counting
Computational plasticity
Consistent units
Cohesive material models
Composite models
Concrete models
Cohesive element formulation
Can I arbitrarily pick the nodes to constrain for a springback analysis?
Can you advise how to improve the speed in the forming analysis? The user may choose either mass scaling or velocity scaling. It is very common to use a combination of the two methods. Extreme care should be taken when using both.
Can you explain the failure behaviors that occur in sheet metal forming?
Constrained space filling – Reasonable Design Space
Can LS-OPT handle discrete variables?
Additional Remarks
Additional Shoulder-Rib test
After the trimming process, some of the elements in the blank mesh have become distorted around the trim line. How can this be avoided?
BioRID II
Calibration Tests
Calibration Tests
Calibration Tests
Arm bending
Arm joint
Arm Tests
Airbag contact
ALE history variables
Anisotropic plasticity models
Beam
An example using GenEx to extract responses
An example using “Repeated anchor vector” to extract histories
An example using “Column vector” to extract histories
ANSA
Applications of Optimization
Algorithms
3.9 to 4.0.1
Accelerations
Abdomen Pendulum Test
A pathological case of volume locking in triangular elements
Abaqus
Accelerometers
Accelerometers
Additional Outputs
Additional Remarks
Accelerometers
Additional Remarks
Accuracy
Additional Material
Overview
Overview
Pelvis Acceleration
Pelvis Load Cell
Overview
Pelvis Force
Pelvis and Torso Angle
Pelvis Pendulum Test
Outer Rib Band Test with Arm
Outer Rib Band Vertical Pendulum Test with Arm
Outer Rib Band Vertical Pendulum Test
Overview
Pelvis Acceleration
Pelvis Certification Test
Overview of available Dummy Models
Part inertia
Papers
Parameter Identification
Parameterization of input curves: Optimizing LS-DYNA input curves
Parameter Identification
Positioning, Tree File
Positioning File
Pre-stressed Parts
Performance
Pelvis Tests
Pubic Symphysis Load Cell
Positioning
Performance
Pelvis Shape Barrier
Pelvis Shape Barrier : Arm Position — Second Notch
Pelvis Shape Barrier : Arm Position — First Notch
Pelvis Shape Barrier and WorldSID without Jacket
Positioning, Tree File
Performance
Performance under MPP
Preload general
Perl
Perl
Probabilistic Variables: What is the difference between control and noise variables?
Postprocessing
Repairing Seatbelt Elements
Release Notes
Release Notes
Release notes v8.0
Release notes v7.6
Release notes v6.0
Release notes v5.0
Release notes v5.0
Release notes up to v4.0
Release Notes
Radial Return
Quasistatic simulation
Recommendations for structural impact
Release Notes
Release_Notes_LS-DYNA_R13_0
Release Notes
Release Notes LS-OPT
Release Notes LS-TaSC
Reliability Analysis
RBDO
Results of Spine Fixed up to T1
Results of Spine Fixed up to T8
Results of Spine Fixed up to L6
Rib Deflections 1D (up to hardware SBL E)
Rib Deflections 2D (from hardware SBL E)
Rib Accelerations
Rib Intrusion
Responses
Result extraction for LS-DYNA input files using *CASE
Sacro-Iliac Load Cells
Rib Rotations
Rigid body contact
Rigid wall contact
Sense switch control
Selective mass scaling (SMS)
Robustness
Robust Parameter Design
Sensitivity Analysis
Setting parameters in the Genetic algorithm
Run
Sled Test with Spine only
Sign Convention
Shoulder Load Cells
Shoulder Pendulum Test
Shell Formulations
Shell offset
Shell output
Shell Strain
Shooting node
Shape Optimization
Setup
Spine Acceleration
Sled Tests with Spine
Spherical Joint Forces
Sled Tests
Solving problems with path dependent materials
Solid output
SMOOTH option
SOFT option
Some guidelines for implicit analyses using LS-DYNA
Sports Car Seat
Thorax Pendulum Test
Spine Accelerations
Thorax Certification Test
The Next Step
Subcycling
The tension test
The equations for isotropic von Mises plasticity
The consistency condition
The continuum tangent matrix for plastic flow
The consistent tangent matrix
Strain rate
Strain measures of solid elements
Switching from implicit to explicit
There are several linear solvers for implicit analysis. Can you tell me which one is the fastest and most accurate?
There are several non-linear solvers for implicit analysis – which one is better?
There is no load applied to the blank when I used *LOAD_MASK. What might be the problem?
System-/Parameter Identification
Strategies for metamodel-based optimization
Strategy Single Iteration vs. Sequential
Tibia Load Cells
Time integration
Time step size
Tied, Tied Offset, and Tiebreak Contacts
Topology Optimization
Using the Model
Upper and Lower Neck Load Cell
Using the Model
Using the Model
Tutorials
Units
Units
Total energy
Upgrade a Network License (Microsoft Windows)
Upgrade a Network License (Linux/Unix/Solaris)
Use the card of *CONSTRAINED_RIGID_BODY_STOPPERSYou can constrain the displacement by specifying a negative value for LCMAX and LCMIN.How is seamless springback analysis done with LSDYNA?
Tutorials
Training Class Handouts
User Defined Solvers
User Defined Result Extraction
v3.8 to v3.9
v3.6 to v3.8
v3.1 to v3.6
v3.0 to v3.1
v2.5 to v3.0
v2.0 to v2.5
v1.5 to v2.0
USSID
Viscoelastic materials
Viscoplastic strain rate formulation (VP)
What are the differences between implicit and explicit?
What are the differences between smooth and non-smooth trimming?
What can I do if the direction of the pressure is not reasonable after the mesh had been refined adaptively?
What can I do if the mesh for the last state was not written to the d3plot after restarting from d3dumpxx?
Welcome to LS-OPT Support Site
What are the fundamental differences between RBF and FFNN?
What do I have to consider when running LS-OPT on Windows?
Videos
What is FLD?
What do the ANOVA bars mean?
What is mass scaling?
What is the difference between a discrete beam and a spring ?
What is the difference between *CONTACT_AUTOMATIC_ SINGLE_SURFACE and *CONTACT_AUTOMATIC_GENERAL ?
What is the IGNORE flag good for?
What is the commonly used contact type in stamping analysis?
What is the effect of R value (material anisotropic parameter) on FLD?
What is the effect of R-value on material formability?
What is the material formability?
What is the proper punch speed that could be used in stamping simulation?
What is the proper strategy to switch from implicit and explicit method or from explicit to implicit method?
What is the use of defining a box for drawbead?
What is the use of RIGID-BODY_STOPPER?
What kind of velocity pattern is better for metal forming analysis?
When I a used drawbead in the forming analysis, it was observed that some of the elements which moved over the bead line were distorted, and there is no obvious reason for this effect. What might be the problem?
When I attempt to do a springback analysis, I sometimes have difficulty in obtaining a converged solution. What options are available to improve convergence of springback?
When I did dynamic relaxation analysis in gravity loading process, it took a long time to get a converged solution. Is there a way to make this analysis faster?
When I did forming simulation, I found that a material failure was predicted earlier then expected, what might be the problem?
When I do springback analysis, the prediction is not satisfactory. I didn’t find any problem in the input deck. What should I check to improve the solution quality?
What is the difference between main and total stochastic contributions?
What is topology optimization?
WorldSID 50%
When I run forming simulation, I had such message as “Error: slaves nodes may cross the surface, please check your model, job continues.” I’ve checked my input deck and didn’t find any obvious mistake for the mesh. How can I fix this problem?
When I tried to trim the mesh after forming, the generated ‘dynain’ file contains the mesh without trimming, what is the problem and how can I fix it?
When I trim the blank using IGES file, there is a message such as “Entity type xxx form 0 not supported # lines = x”. What does it mean?
When I trimmed the mesh after forming, I only used one trim curve (in IGES format), but LSDYNA found 10 trimming curves. Accordingly, the result was not acceptable. What was the problem?
When I use constrain method (SOFT=4 in the FORMING_ONE_WAY_xx card), the calculation terminates immediately, what is the problem?
When I use FEA, I don’t know how big the mesh size should be. Would you please tell me what is the proper mesh size?
When I use mesh adaptivity in my stamping simulation I don’t know how to define the proper adaptive frequency. Would you please give me some suggestions?
When I use the implicit method to do springback analysis I cannot obtain a converged solution no matter what I’ve done. Do I have some other choices to obtain a converged solution for springback prediction?
When I used coarsening, I found that there is an error message:’ Something is wrong, sub: nextele’. What is the problem, and how can I avoid it?
When I used implicit method to do springback analysis, the iteration information was not output or displayed in the screen. I think this iteration information is important for me to monitor the convergence status. How can I display this information?
When I used switch method in my calculation, I used explicit method and then I changed to implicit method. In the later implicit calculation process, it was seen that the contact didn’t work properly. What was the problem, and how can I avoid this?
When I used the seamless method to do both forming and springback analysis, a converged solution wasn’t obtained. I don’t want to repeat the forming analysis. Is there a way I can repeat the springback analysis from the previous output files?
When the constraint contact is used, the calculation crashes during the forming analysis. What needs to be done to prevent this?
When we do springback analysis, we have two choices to do it, i.e. using implicit and explicit method (dynamic relaxation). What is the advantage of using the implicit method in springback analysis?
Why does the restart of the springback analysis not work?
Why dynamic relaxation doesn’t seem to work at times?
Will the mesh coarsening affect the accuracy of springback prediction?
Worst-case Design
Why does the checking of the *DATABASE cards return an error, but the binout files are generated correcty?

Subcategories

Dummy Models

Neck Torsion
Numbering
Neck Load Cells
Outer Rib Band Test
Neck Pendulum Test

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LS-DYNA support

No matter how I’ve tried, I can’t trim the elements with the IGES line data. Is there any alternative to do trimming?
Negative volumes in brick elements
Not a Number (NaN)
Negative volume in soft materials
Orthotropic materials

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LS-OPT Support

Optimization
Optimization
Optimization
Multiobjective Optimization
Multi-level Optimization

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