Slow Abaqus Simulation

[jstaunton9]

Hi, I am a student trying to simulate a scalpel cutting soft-tissue. My units are in milli-meters. The soft tissue properties I assigned are the density, Mooney-Rivlen and the Mullens effect. The scalpel and and soft tissue are extruded to 1mm. Initial velocity of the scalpel is -0.25mm/s during a time period of 0.25s. I have no prior experience with Abaqus and so my simulations take a very long time to run.

Any advice is greatly appreciated

 

[FEA way]

Can you share some pictures showing your model so that we can see the geometry, mesh, boundary conditions, loads and constraints/interactions (including contacts) ? Or, if you can, please attach the .cae or .inp file. If it's explicit dynamics analysis then you can either decrease the step time (and thus speed up the event artificially) or use mass scaling. Both methods can significantly reduce the time needed to complete this analysis. And of course use parallel processing with maximum available number of CPUs.

 

[IceBreakerSours]

Do you have any experience with FEA? How are you modeling the cutting process? If the answer to the first question is no, then I'd stop and have a chat with more experienced people in the team first.

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[jstaunton9]

I have read about mass scaling and increased load rate from a paper of a similar project but have spent two days trying to implement without any luck. I have also attached the .cae file

https://link.springer.com/article/10.1007/s11701-015-0531-2?shared-article-renderer#Sec7

 

[jstaunton9]

IceBreakerSours everything I know about Abaqus I learned from you tube but I have only recently stated to try reach out for more help. I'm just doing a Bachelor degree so I'm kinda on my own team

 

[FEA way]

Here’s what you can do to speed up this analysis (apart from what I said in the previous post):
- define contact pair only for faces that are expected to touch or use general contact
- model the tool as rigid body
- apply velocity boundary condition to the top face only (or reference point if the tool is rigid)

 

[jstaunton9]

Thank you FEA way. Where can I find the option to apply mass scaling?

 

[FEA way]

To activate mass scaling go to step settings (Edit Step window), switch to Mass scaling tab, select Use scaling definitions below and click Create. There you have several options but you can leave default ones and only specify scaling factor or target time increment.