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The geometric strain you show for erosion is 1.5 or 150%.

Did you mean to have failure at 1.5% strain? If so you have to type 0.015 in the field for strain.

Mass scaling can be used in a 2D axisymmetric model, so I assume it should also in 2D planar.

Here is a message from the solver when I requested too large of a time step...

Initializing.....Please wait

Mass scaling limit exceeded for Part SurfaceBody, fraction of added mass = 1.0899E+01

Mass scaling limit exceeded

Finished model setup with errors...

However, when I tried to use mass scaling in a that 2D model, I didn't see an increase in the time inc over a run without mass scaling.

I see you are using the AUTODYN interface, while I am using the Workbench Explicit Dynamics interface to the AUTODYN solver.

This is the input form that enables mass scaling

If you use the Workbench Explicit Dynamics interface to the AUTODYN solver, getting the geometry is very easy.

I described how to do that in this post.

I am interested to know more about your model. What is the true length of the lattice? Which concrete is the lattice made of? Please tell me more about how the structure is loaded. Does one end have an applied velocity and the opposite end a fixed support?