Simulation time too high (simple model to demonstrate the problem)

Ashmita Tiwari

I am trying to estimate the forces it will take to break the Rivets. The run time is too high. I created a simple model to demonstrate the issue with my setup. Attaching the dummy model that recreates the error. Need help fixing the issues in my model.

Force_Rivet_0000.rad

Force_Rivet_0001.rad

PaulAltair

Timestep in explicit analysis is derived from:

smallest element size/ SQRT(Modulus/Density)

Your mesh is too poor in quality to work well and leads to timesteps of order of magnitude 6e-12ms

In attached version, I roughly remeshed your 'strap' to be better mesh and made the 'tube' rigid, since it looked like that was what you were trying to do with it anyway? I also added mass scaling to raise timestep to 1e-3ms (it adds 180% mass, but since the model is quasi static, this should be ok.

I would recommend reading the Radioss E-book : ebook

Or following some of the tutorial examples in the help as an introduction to explicit analysis

Force_Rivet_0000.rad

Force_Rivet_0001.rad