~~NOTOC~~
====== Elastoplastic Ring Collision ======

  * **Solver**: LAMMPS with the USER-SMD package

  * **Method**: 
    * Total Lagrangian SPH to eliminate the tensile instability
    * Anti-hourglass control to reduce zero-energy modes

  * **Material**:
    * Ring on the left: elastic
    * Ring on the right: elastic perfectly plastic

  * **Interaction**: repulsive Hertzian force

  * **Post-processing**: ParaView

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