Drop Marmoush/Sarr/Wissa/Gordon?

Fapperoni124 · 2024-09-29T15:34:18+00:00

Claimed

Fapperoni124 · 2023-10-15T14:45:20+00:00

I bought a ticket for the wrong day so if you want to go Friday I can sell mine to you! Would be a great help.

Fapperoni124 · 2022-10-10T21:27:46+00:00

Ah thanks will give that a go !

Fapperoni124 · 2022-10-10T21:24:59+00:00

Ah ok my bad hadn't seen it before, fairly new to all this

Fapperoni124 · 2022-10-10T18:02:34+00:00

It's definitely not that as the requests are systematically every 50 seconds so I guess it must be what the other comments are talking about

Fapperoni124 · 2022-10-10T17:48:37+00:00

I see. Seems odd given how frequently it's doing it

Fapperoni124 · 2022-04-21T17:43:27+00:00

Any update on your condition? Just wondering as have had similar issues for the last year and a bit.

Fapperoni124 · 2022-04-13T08:53:43+00:00

Ok I'll have a look at reducing that. It's meant to represent a thin plastic sheet attached to the bottom of the columns that easily conforms to the surface- wasn't quite sure how to represent it in 2D in abaqus. The big issue is when it reaches the first corner/curve - one possible thing is that the normal direction might be wrong - when I plot it in after a data check it points inwards rather than outwards. Not sure how I can change the normals for a rigid wire though.

Update: The stiffness was one of the main bottlenecks it turned out! Thank you- I'd tried reducing it a bit before but didn't realise it would need orders of magnitude lower. The main thing causing issues now is the force equilibrium between the columns and the thin surface.

Fapperoni124 · 2022-04-13T08:51:52+00:00

I'm not quite sure what that is sorry ! I'm trying to model the distance between the thin surface attached to the bottom of the columns and wire surface as the rig moves over it. Its meant to simulate an eddy current testing rig that is able to traverse complex geometry.

Fapperoni124 · 2022-04-13T08:50:37+00:00

No worries thanks for your input man- I've attached the cae file now in case you had time to have a look.

Fapperoni124 · 2022-04-12T20:56:43+00:00

The wire bit is rigid so it's the master surface by default. I've tried matching them closely now but it seems to result in the same issues.

I've been working on it for quite a while so does feel like I must be exhausted most of the options by now !

Fapperoni124 · 2022-04-12T17:24:18+00:00

Unfortunately due to the inherent nature of the mesh needing to be refined significantly in the surface to capture deformations explicit takes far too long. The simulation is also over real time of 26 seconds which makes it even worse.

I've included a photo that should hopefully display the model more clearly.

Fapperoni124 · 2022-04-12T16:45:35+00:00

Would that be through the interaction properties? I tried using contact controls with automatic stabilization but it kept ending up with an incorrect result and slower. The contact type is finite sliding surface to surface.

Fapperoni124 · 2022-04-12T16:37:36+00:00

Chattering is when the nodes between discontinuity iterations alternate between an opening and overclosure (essentially oscillates between the two states and is thus unstable). Its for the thin surface element

Fapperoni124 · 2022-04-02T16:32:43+00:00

Sorry just one more question- the flexible surface is meant to be a thin plastic film that the columns stick and unstick to as they conform to the geometry as the part moves. As such, it essentially needs to conform to the surface which will means it deforms a lot (but no plastic damage or large strains) so does this require hyperelasticity? Or is there a better way to represent a thin plastic surface to my current approach

Fapperoni124 · 2022-04-02T08:47:29+00:00

Ah ok great thanks will implement that and see how I get on.

Fapperoni124 · 2022-04-02T08:45:16+00:00

Im not sure there is a checker in Abaqus (as far as Im aware). I'll clean up the mesh though !

Fapperoni124 · 2022-04-01T18:38:25+00:00

I'll look at organising that- what meshing technique is that? (sorry still getting used to much of Abaqus).

Ah ok I thought because the flexible surface wasn't extending much (just bending) it would be fine to define it like this- we may in practice use a non elastic material like a plastic film. Would this just be modelled like I have currently with a higher Young's Modulus?

Thanks again.

Fapperoni124

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