iMechanica - cyclic loading - Comments

Convergence

Zach Thiemann — Wed, 14 May 2008 10:34:33 -0400

I'm running a model with solid elements and concrete damage plasticity model. I'm having problems with convergence as I make my geometry more complex. I've modeled a slab and I-girder as one solid element to model a monolithic connection between the girder and slab. When I run the same model with only a concrete slab the model runs fine and will converge. But once I redo the geometry and include the girder with the slab the model does converge after a fraction of the previous model. Any suggestions on what to change? I'm using the Riks method to solve the iterations. I'm trying to end with Force vs. Displacement diagrams for the model.

Need Help

m_meisam — Mon, 24 Dec 2007 08:14:15 -0500

How U define the concrete plasticity in abaqus?

Explicit vs Standard

Gabriel Sas — Wed, 21 Nov 2007 02:47:20 -0500

Thank you for the interest shown Mr. Wang. I will run an Standard analyses to see the differences.

why do you want to use Explicit for quasi-static?

Mingji Wang — Tue, 20 Nov 2007 22:07:33 -0500

You need a good control to eliminate inertia effects. Any accumulated error will become stress wave in the model. Try Standard which has stringent convergence criterion.