Computational and Multi-scale Mechanics Group

The Element-Free Galerkin (EFG) was implemented [1,2] in LS-DYNA  to couple with standard FEM to enhance solution accuracy in high gradient field and overcome mesh distortion issue in large deformation analysis. 

​

• Advantage

  • High order accuracy and smoothness in solution field

  • No need of hourglass control

​

• Current implementation [ex]

  • 2D plain strain & axisymmetric

  • 3D solid and shell

  • FEM mesh automatically converted as EFG input

    • Nodal points converted ​to EFG meshfree nodes

    • Elements converted to background mesh

  • Pressure smoothing in 3D solid [3] [kw]

  • Adaptivity 

  • Thermal-mechanical coupling

  • Explicit and implicit analysis

​

• Limitation

  • Not suitable for material failure analysis

​

• Keyword

  • *SECTION_SHELL_EFG

  • *SECTION_SOLID_EFG

 

• Application​​​

  • Bulk forming, forging & extrusion (EFG solid with adaptivity)

  • Sheet metal forming & crashworthiness (EFG shell)