ABAQUS 3 point bend model

[Chrissy123]

Hi - I am simulating a simple 3 point bend model in ABAQUS. It's for a sample steel specimen so the dimensions are 400mm long, 25mm wide and height of 44. The span of the supports is 300 mm.
I have successfully managed to get a good load/displacement plot using Static General analysis, but I'm wondering if really I should have used Dynamic Explicit analysis ? I am loading the this bar pat it's yield stress to get into Plasticity (so I have added the plastic data to the model based upon the re-calculation for true stress from the engineering stresses.
I now want to model springback and I can see that I could do this via import of ABAQUS/Explicit into ABAQUS/standard. So two questions really :
1. should I really be using dynamic explicit or implicit for this model or is general static good enough (as I'm getting good results)
2. Can I then import the results from the general static analysis to then carry out the analysis to measure springback ?

thanks,

 

[FEA way]

Well, it depends which assumption you want to use - all are adequate for such scenario. Dynamic analysis will be the most realistic, no doubt. It will include inertia effects and can provide very good results. Both implicit and explicit solver may be used for this event. You could also try quasi-static approach but personally I would go for dynamic explicit analysis since it gives great results and utilizes very efficient general contact algorithm. The disadvantage is that explicit method is conditionally stable and may solve for a very long time if the mesh is dense.

 

[Chrissy123]

Hi - yes - that is what I am finding now - my mesh is quite dense - it's been running for ages and only up to time of 0.1189 so far and I have the time as 1 - so seems like it's going to take hours !

 

[FEA way]

In case of explicit dynamics the minimum time increment is calculated for all elements and then longest one is taken. So literally one small element may increase your analysis time several times ...

 

[Chrissy123]

That's a good tip thanks - I'll check that out - thank you