Having problem with analyzing surface model

[richard]

Hi Everyone,

I am trying to analyze thin sheet (2 mm) structure. For this reason created model with surfaces for shell elements. If meshed with unchecked 'Continuous Meshing' solution fails.

FATAL ERROR E5000 SINGULARITY DETECTED AT GRID 19508 COMPONENT 6

If meshed with checked 'Continuous Meshing' solution finishes but without any plots except 'Displacement' and 'Rotation' but with no results (ranging from 0 min to 0 max)

Any comments will be much appreciated

BTW how to check 'GRID 19508 COMPONENT 6'

Model attached.

Running Inventor Pro 2021 with Nastran 2021

Kind regards,
Richard Kowalczyk MIEAust CPEng RPEQ
RKad Engineering
Australia
E: richard.kowalczyk@rkad.com.au
W: www.rkad.com.au

CPU: Intel Core i7-6950X

Ram: 64.0 GB

System: Win 10x64

[Roelof.Feijen · Accepted solution]

Hello @richard ,

The white edges indicate that the nodes on the edge of faces do not connect.

You need to turn Continuous Meshing On in this case.

Note that a Distributed Load does not have any effect on Solids and Shell elements.

It can only be used in combination with Line elements.

[richard · Accepted solution]

Hi Roelof,

Thanks for the quick response. I have applied 'distributed load' as a last
resort. I have tried 6 single loads, 2 groups of 3 loads with option for
'total force' checked and after your response with single force applied to
the hole edge always with the same result for 'Displacement' (0 min to 0
max). When created surface areas around the holes to apply loads then it
worked. I am surprised that could not apply loads to the edges.



Kind regards,
Richard Kowalczyk MIEAust CPEng RPEQ
RKad Engineering
Australia
E: richard.kowalczyk@rkad.com.au
W:www.rkad.com.au

[Roelof.Feijen · Accepted solution]

Hello @richard ,

I was surprised too, when I ran into it the first time.

The edge of a surface can also be used to create a line element. So not only sketch lines can represent line elements.

I think that's the reason why you don't get a warning message when applying a distributed load to an edge.