Creating a non-reflective surface using infinite elements

[mattfarr90]

Hi all.

I'm new to abaqus and struggling to acheive the model set-up I want. I'm creating a half-model of a ring, which I am then crushing. I want to eliminate the reflection of stress waves from the two boundaries where the symmetric axis is. Looking online and through the manual I realise that I need to use infinite elements on the two surfaces along the symmetric axis. However, I can't see in terms simple enough for me to follow how to achieve this with my application. The model is 2D.

Any help, particularly a step-by-step walkthrough, would be much appreciated. Thanks!

 

[PamCrash]

If your model is symmetric then loading is symmetric too. The reflection is the wave from the opposite side. Nothing for infinite elements

 

[mattfarr90]

Yeah, I know that. It is more a case of curiousity to make sure the stress distruibution matches the places where the material hinges when there isn't a mess of stress waves distorting the view, and also make sure I know how to use infinite elements for future use.

Thanks

 

[mosgef]

Not sure if the use of infinite elements is really appropriate for this loading condition, but they are elements of n-1 dimension for an n-dimensional analysis. Since you're running a 2d simulation, they would be 1-d line elements. Depending on what pre-processor you're using you can do something like 'edges', or 'convert feature to line' etc. Once you have the elements created, they will need a *SOLID SECTION, with whatever additional parameters are relevant. The documentation on this is pretty good.

 

[mattfarr90]

Okay thanks a lot, I'll see if I can get that working.