LS-DYNA



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LS-DYNA

LS-DYNA developed by Livermore Software Technology Corp. (LSTC) is a multi-purpose explicit and implicit finite element program used to analyse the nonlinear response of structures. Its fully automated contact analysis and wide range of material models enable users worldwide to solve complex real world problems

Applications
LS-DYNA is used by companies and universities worldwide to simulate a whole range of different engineering problems. These include:

  • Crashworthiness
  • Occupant Protection
  • Metal Forming
  • Product Testing
  • Drop Testing
  • High Velocity Impacts
  • Blast Loading
  • Biomedical
  • Seismic Analysis
  • Staged Construction
  • Pore Water Pressure Consolidation
Crashworthiness Simulation
For many automotive companies LS-DYNA is a tool for understanding the deformation of complex systems such as vehicle structures. The ability of LS-DYNA to model contacts and its wide range of material models make it ideally suited for this type of analysis. It also includes a number of specific features for automotive applications such as:
  • Spotweld Models
  • Airbag Models
  • Seatbelt System Models
  
     
Occupant & Pedestrian Safety Analysis
Providing crash protection for occupants and pedestrians is an integral part of modern vehicle development. A range of fully validated FE models of the major physical test devices is available for LS-DYNA. These include:
  • Hybrid III 50th Percentile Male Dummy
  • Hybrid III 5th Percentile Female Dummy
  • EuroSID-II Side Impact Dummy
  • US-SID Side Impact Dummy
  • SID-IIs Side Impact Dummy
  • Pedestrian Headform Impactors
  • Pedestrian Legform Impactors
  
     
Metal Forming
LS-DYNA has been used for sheet metal stamping since the late 1980's and can be used to assess a proposed forming process and tool design. Along with the forming process you can also simulate trimming and springback. LS-DYNA has the capability to analyse a variety of different forming processes including:
  • Rigid Tool Stretch and Draw Forming
  • Sheet and Tube Hydro Forming
  • Flex Forming
  • Roll Forming
  • Superplastic Forming
  
     
Drop Testing
LS-DYNA has been used to simulate impact events of different containers for many years. Ranging from small electronic products such as mobile phones and laptop computers, up to large nuclear fuel containers. Features include:
  • Fluid Structure Coupling (ALE / SPH) for modelling liquid filled containers
  • Element Free Galerkin (EFG) for modelling cracks
  • Explicit-Implicit switching for studying steady state deformation
  
     
Seismic Analysis
LS-DYNA provides engineers with a tool for modelling the complex nonlinear behaviour of a building during seismic events. Non-linear response history analysis can be performed using element types and functions including:
  • Lumped plasticity
  • Fibre elements
  • Nonlinear dampers
  • Buckling elements
  • Frequency-dependent damping
These features make LS-DYNA an ideal tool for engineers practising performance-based earthquake engineering. 		 

Analysis Capabilities
LS-DYNA has the capabilities to simulate a wide range of different physical phenomena using analysis techniques such as:

  • Explicit and Implicit Time Integration Schemes
  • Nonlinear Dynamics
  • Large Deformations
  • Sophisticated Material Models
  • Complex Contact Conditions
  • Thermal Analysis and Thermal Structural Coupling
  • Fluid Dynamics and Fluid Structure Interactions
  • Smooth Particle Hydrodynamics (SPH)
  • Element Free Galerkin (EFG)
  • Eigenvalue Analysis

Material Models
LS-DYNA has over 130 material model which can be used to simulate a wide range of engineering materials from steels to composites to soft foams to concrete.

Element Library
LS-DYNA has an extensive element library including 1d discrete, beam, shell and solid elements. For which a range of both under integrated and fully integrated element formulations.

Contact
The fully automated contact analysis capabilities in LS-DYNA are easy to use, robust and validated. They use both constraint and penalty based methods to satisfy contact conditions. These techniques have worked extremely well over the past 20 years in numerous applications such as crashworthiness, drop testing and occupant safety. Multiple types of contact definitions and friction models are available.