The Sink Mark Error/Bug (as promised)

[JayMuller]

Hi All,

as promised in my latest posts here you get my Sink-Marks-NOT-Working-File.

For explanation:

I made a few sink marks test because I had an issue with one that was not shown in ASMI.

So I worked out a geometry that ASMI couldn't calculate right ( that was 2012 I guess) - and still this geo could't be calculated within ASMI 2015.

Same mistake as always.

The geo is an ancient roman No 1or a double T, with a really fat rib in the middle  - Result: no sink marks estimate result in DD and 3D.

Then I took this DD mesh and cuttet the bottom, so it became a single T, re-run analysis - Result: huge sink marks estimate result in DD and 3D.

Why is that not working right?

------------

I attached 2 sim files for Double T and Single T in 3D, and two screen shots of the result.

Now I am very exited who knows what's wrong.

Regards,

Jay.

[madhukeshwart]

Hi JayMuller,

I did fine meshing from your study, but noticed different results. i.e indicated sink mark in both the options but different locations.

 (refer attached image.)

 Reasons might be

1. It may be a reason of algorithm, which used for solving sink mark.

2 I assume, the solving method might be same used for both DD and 3D.

3. Wrong thickness consideration 

4. Matched nodes or un matched nodes.

[JayMuller]

This topic was also redirected to my local autodesk support ( ??? )

07.05.2014  I received an automated autodesk customer support e-mail, that this case will be given to an autodesk specialist.

08.05.2014 local support asks me if case is still up to date - sure. Answered an hour later, no reply yet.

keep you informed!

Regards,

Jay

[Anonymous]

Jay,

Any updates on their progress yet? I am very interested in this bug and seeing if it has any impact on actual parts or if it only appears in theoretical ones like this.

-Jeff

[JayMuller]

Dear Jeff,

nothing happened until now...as I wrote last e-mail still is of 08.05.2014. But my support always forgets things they couldn't handle.

"seeing if it has any impact on actual parts or if it only appears in theoretical ones like this" 

This theoretical geometry I created  was a reduced section of a housing. There I had a huge sink mark in reality but not in the simulation...so I checked the flow direction in the section and cutted it out of the mesh, set an injection cone (after repair) AND bingo...no sink mark...then I cutted more....until it was very near to my theoretical geo. 

When I cutted the lower horizontal rib, the sink mark was shown...then its not a long way to a T or double T Geo.

When you find a double t like section in your model - check for sink marks. Doesn't show, then cut it out and re-run.

Regards,

Jay

[JayMuller]

The SUPPORT called me 26.06.2014 ...wow 6 weeks (only) later...tool was build in 5 weeks

First:  they called!!!     Nothing written - as always - no responsibilities !!!

Second: Supporter had no information on the case - no forum access (he told me) - no attachments

[ And now he tries to understand and to solve this issue in 5 minutes by phone - are you kidding me???? ]

Result: NOTHING!!! The only thing he always repeted was " sink mark calculation is not working that good" [He didn't know anything about the programming behind sink marks] He only had theories but nothing real.

HELP!!!!     HOW CAN I CHANGE THE SUPPORT-COUNTRY  ???

OK Support Germany gave up .... Anyone who knows better??? Which Autodesk support country is BEST!!!