XANSYS Message: 175 [Go back to message list] [bookmark on del.icio.us]
No rating yet Subject: Re: Stress concentrations Author: Rick Fischer Date: 1999-01-11 13:00:00Plasticity, yes, I forgot that one. Good point, Patrick! I've done this, it can be done, but can be tricky. Some pointers:
1. Use plastic material only where yielding is likely. Set up a one material for the elastic part of the shaft and one for the plastic part. Use the elastic material everywhere except near the contact. The solution will run faster with with fewer nonlinear elements.
2. Let AUTOTS do the work by using NSUBST to set a wide range of min and max timesteps.
3. If convergence is difficult, set the gap stiffnesses real low, run to convergence, then restart with higher gap stiffness. Warning: If you use a CONTACT48 with a fine mesh and a low gap stiffness, it is possible to push the contact node so far thru the target that it will exit the back of the pinball and release.
4. Use a realistic yield modulus. The flatter the curve, the harder the convergence.