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von TomGroves
So 12. Jul 2015, 16:23
Forum: Z88OS
Thema: Simulating gravity by forces at nodes
Antworten: 3
Zugriffe: 4358

Re: Simulating gravity by forces at nodes

Really? Surely there's no local plasticization when a (relatively light) steel object sits on a hard surface?

Is there a guide somewhere on how to do the refinement and re-evaluation at the singularities? I'm new to FEA, and I was not expecting this complication :-/

Thanks,
Tom
von TomGroves
Mi 8. Jul 2015, 12:42
Forum: Z88OS
Thema: Simulating gravity by forces at nodes
Antworten: 3
Zugriffe: 4358

Simulating gravity by forces at nodes

I'm trying to simulate gravity on a 2D object by distributing the force across the nodes (as described in z88mane.pdf, page 97, fig.2). The object is supported by fixed nodes with zero displacement at the bottom. I'm seeing an odd result: ForceConcentrate.png Why is the stress concentrated at the co...
von TomGroves
Mo 6. Jul 2015, 17:58
Forum: Z88OS
Thema: z88r won't handle home-built input
Antworten: 10
Zugriffe: 8628

Re: z88r won't handle home-built input

Your structure must not contain "free" nodes which are not connected to the rest of the structure. Aha! :D That's done it! Once I get rid of those floating points, it works! And for once it wasn't my code which was to blame - for some reason GMSH was deciding that it didn't like certain q...
von TomGroves
Fr 3. Jul 2015, 13:10
Forum: Z88OS
Thema: z88r won't handle home-built input
Antworten: 10
Zugriffe: 8628

Re: z88r won't handle home-built input

OK, I've sorted out the DOF problem. Thanks I've also kept track of which nodes are fixed, and not bothered exerting force on them. The main problem is that your structure is invalid. The middle nodes are overlapping, that means there are two nodes where there should only be one (see screenshot). Th...
von TomGroves
Do 2. Jul 2015, 16:49
Forum: Z88OS
Thema: z88r won't handle home-built input
Antworten: 10
Zugriffe: 8628

Re: z88r won't handle home-built input

Wow, quick replies! Thanks :) Looks like a Memory Problem. Did you adjust the file z88.dyn? Please See the proper section in the manual. No, because the section on z88.dyn said it would tell me if it ran out of memory. I have now tried increasing several of the parameters, but it made no difference....
von TomGroves
Do 2. Jul 2015, 12:39
Forum: Z88OS
Thema: z88r won't handle home-built input
Antworten: 10
Zugriffe: 8628

z88r won't handle home-built input

I'm trying to use z88r on 2D quadrilateral meshes (from the command line, because it's going to be called from another program). I'm using a unix64 machine, and my installation of z88r runs quite happily on example b1 (either with -choly or -siccg), which is the closest to what I'm trying to do. How...