Missy Ji
Ansys Employee
When you have failure criteria, please note that these are different from erosion criteria. Please remember that erosion removes cells from the calculation, so it's typically not representative of the physical process but, rather, a method we use to prevent the timestep from getting too small.nThe erosion strain has no relationship to a specific material. It is merely a numerical input defining when a Lagrangian element should be removed from the calculation, i.e. when its effective strain reaches the specified erosion strain. If you set it too high, then the simulation time-step may be controlled by a srcewed element and drastically reduce slowing down the simulation and possibly lead to increased energy errors. If you set it too low, then the element may be removed too early when it could still be affecting the results. The default is 1.5.nIf all elements that are connected to a node in the mesh erode, the inertia of the resulting free node can be retained if this option is set to Yes. The mass and momentum of the free node is retained and can be involved in subsequent impact events to transfer momentum in the system.nIf set to No, all free nodes will be automatically removed from the analysis.nYou can turn the visibility of eroded nodes for explicit dynamics analyses on or off, go to Display tab, the Display group contains the Show drop-down menu, where you can turn the visibility of eroded nodes on or off.